# Arbitrum > Thoughts, stories and ideas. Public Ghost content for AI and LLM tooling. This file includes a bounded export of public pages first, then recent public posts. Append `.md` to any post or page URL to get the content in Markdown (for example, `/example-post.md`). ## Pages ### About this site URL: https://blog.arbitrum.foundation/about/ Last updated: 2025-06-16T13:53:51.000Z Arbitrum is an independent publication launched in November 2024 by Arbitrum Foundation. If you subscribe today, you'll get full access to the website as well as email newsletters about new content when it's available. Your subscription makes this site possible, and allows Arbitrum to continue to exist. Thank you! ### Access all areas By signing up, you'll get access to the full archive of everything that's been published before and everything that's still to come. Your very own private library. ### Fresh content, delivered Stay up to date with new content sent straight to your inbox! No more worrying about whether you missed something because of a pesky algorithm or news feed. ### Meet people like you Join a community of other subscribers who share the same interests. --- ### Start your own thing Enjoying the experience? Get started for free and set up your very own subscription business using [Ghost](https://ghost.org/?ref=blog.arbitrum.foundation), the same platform that powers this website. ## Posts ### Builder's Block #025: Arbitrum's Buildathon Starts Next Week, Here's How to Stand Out in Open House URL: https://blog.arbitrum.foundation/builders-block-025-arbitrums-buildathon-starts-next-week-heres-how-to-stand-out-in-open-house/ Last updated: 2026-09-09T15:01:50.000Z 💡 ****What's Important This Week** đŸ’Ș Open House Singapore is Supporting Early Stage Teams with $415k In Prizes + Grants. 💡 Tips and Advice for Founders Building on Arbitrum ⚙ Arbitrum's \~500M txs, #1 in RWA deployments & $6.19M to the DAO. The H1 2026 Report is Live ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### **Arbitrum's Online Buildathon - Open House Singapore - Brings $415k In Prizes + Grants to Early Stage Teams** Here’s how you can win: 0:00 /1:25 1× The 1st phase of Open House Singapore kicks off with a 3-week online Buildathon next week on September 14th. Here Jess breaks down: - What you can win - The types of projects we’re looking for - Why builders should join [Register Today](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) ### **Arbitrum Foundation Reports First Half 2026 Progress Update** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/09/arb-h1-update.jpeg)](https://x.com/arbitrum/status/2095182987012813174?s=20&ref=blog.arbitrum.foundation) Over the first six months of 2026, the Arbitrum Platform has ramped up its efforts in driving long-term growth and sustainable value back to the ecosystem. This includes: - Bringing Robinhood Chain out of stealth and expanding the Arbitrum Platform with LG, Mastercard, Cash App, Venmo, Ramp, PayPal & more - Generating $6.19M in H1 income across 4 revenue lines (with more to come) - Doubling down on support for early-stage teams with Open House & Mentorship Program [Read the Report](https://x.com/arbitrum/status/2095182987012813174?s=20&ref=blog.arbitrum.foundation) --- ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### **Keynote Preview from Offchain: To Be Or Not To Be Onchain** 0:00 /1:09 1× Building a great onchain product starts with two questions: - Does it need to be onchain? - If so, what unique problem does it solve? Hear [@zkLumi](https://x.com/zkLumi?ref=blog.arbitrum.foundation), from Offchain, give advice to builders at Open House on how teams can answer both and ship with purpose. ### **Why We Need MEV & How to Strike the Balance** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/09/jess-mev.jpeg)](https://x.com/0xjesstech/status/2095468637268091128?s=20&ref=blog.arbitrum.foundation) Maximal Extractable Value (MEV) is the extra profit that block creators can extract by choosing which transactions to include, exclude, or reorder within a block. This article by @0xjesstech breaks down the impact of MEV, and how chains, protocols, and users are managing the impacts. [Read the Article](https://x.com/0xjesstech/status/2095468637268091128?s=20&ref=blog.arbitrum.foundation) ### **Fireside Chat: Security Foundations with OpenZeppelin** 0:00 /1:07 1× Building the biggest onchain products starts with security. Learn how building a strong security foundation from day one can protect users and help your product scale with [@PepeBlasco\_tech](https://x.com/PepeBlasco%5Ftech?ref=blog.arbitrum.foundation) from OpenZeppelin. ### **Fireside Preview: User Onboarding with ZeroDev** 0:00 /0:40 1× The most widely used consumer apps have the best wallet infrastructure. Learn from [Kensie England](https://x.com/queenofeng1and?ref=blog.arbitrum.foundation) on how you can simplify user onboarding with ZeroDev. ### **Tips for Founders Joining the Upcoming Arbitrum Open House Buildathon** 0:00 /1:31 1× - Double down on the foundation before adding more features - Keep your infrastructure simple so you can ship faster Hear more from [@PepeBlasco\_tech](https://x.com/PepeBlasco%5Ftech?ref=blog.arbitrum.foundation) at OpenZeppelin. ### Founder Testimonial - Nathan Vandy, Cofounder & CEO, Bond Credit [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/09/0826_Openhouse_FounderTestimonials_Bondcredit.png)](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) [Nathan](https://x.com/vandynathan?ref=blog.arbitrum.foundation) from [Bond.Credit](https://x.com/bondoncredit?ref=blog.arbitrum.foundation) shares how they reached $12M in volume and $100K+ in assets under agent with the right support from Arbitrum's Open House NYC and London builder programs. If you’re a hungry team looking to bring an idea or MVP out of stealth, apply to our online Buildathon beginning September 14th. [Register Now](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### **Spend Market: Pioneers of the Programmable Economy for Consumers** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/09/spendmarket.jpeg) [Spend Market](https://x.com/spendmarket?ref=blog.arbitrum.foundation) (by [@americanspend](https://x.com/americanspend?ref=blog.arbitrum.foundation)) is turning U.S consumer spending habits into programmable markets anyone can trade on - pioneering a new category based on real spending habits across food, tech, and finance powered by Arbitrum's speed and deep liquidity. [Check it Out](https://spend.market/?ref=blog.arbitrum.foundation) ### **RWAs on Arbitrum Reached $1B** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/09/rwa-1b.jpeg)](https://tokenterminal.com/explorer/tokenized-assets/rwas?chains=arbitrum,robinhoodchain&interval=90d&ref=blog.arbitrum.foundation) RWAs on the Arbitrum Platform (Arbitrum One + Robinhood Chain) soar to $1B in market cap. The future of finance is programmable. [Check Out the Data](https://tokenterminal.com/explorer/tokenized-assets/rwas?chains=arbitrum,robinhoodchain&interval=90d&ref=blog.arbitrum.foundation) ### Swaps Are Live: TradFi Liquidity Is Now On-Chain [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/09/variational.jpeg)](https://x.com/variational%5Fio/status/2094870805578739970?s=20&ref=blog.arbitrum.foundation) TradFi markets just got a lot more programmable on Arbitrum. Starting with gold (XAU) and Nasdaq-100 (US100), Variational’s first swap markets bring TradFi liquidity onchain. [Read the Article](https://x.com/variational%5Fio/status/2094870805578739970?s=20&ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### **Arbitrum Nova Minimization: Migration Window Concluded** The 90-day migration window in which developers and users were encouraged to migrate from Arbitrum Nova to Arbitrum One has concluded. From today, Arbitrum Nova will be transitioned into a minimized state, with Nova-specific developer and user support deprioritized. Note: Developers and users will still be able to migrate from Arbitrum Nova to Arbitrum One, albeit with less support and potentially fewer bridging solutions available. [Learn More Here](https://x.com/ArbitrumDevs/status/2064311595619192983?s=20&ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### **Open House Singapore online Buildathon Kicks Off September 14** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/09/image.png)](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) Open House Singapore will kick off with a 3-week, online Buildathon on September 14, designed to help founders refine their direction and iterate towards an MVP. Teams that are looking to bring novel financial products to the Arbitrum Platform are welcome to apply today. [Register for the online Buildathon ](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) ### Founder House Singapore is Coming to Singapore on October 23 [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/09/0826_OpenHouse_Singapore_Location_FounderHouse_Date_1080x1080.png)](https://luma.com/openhouse-singapore?utm%5Fsource=src.builder-block~med.newsletter~cmp.oh-singapore-founder-house) Following the online Buildathon, Founder House Singapore is an application-only, three-day, in-person experience built for founders and teams who already have an existing product, prototype, or business and are actively building. ​Selected teams will spend three focused days alongside fellow founders, ecosystem leaders, and mentors, working to ship meaningful product progress, validate key assumptions, and receive direct feedback from the Arbitrum ecosystem. [Secure Your Spots Now](https://luma.com/openhouse-singapore?utm%5Fsource=src.builder-block~med.newsletter~cmp.oh-singapore-founder-house) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### **OpCo Update August 2026** Find the general updates from OpCo that cover everything we and the OAT have been working on throughout August. Going forward, monthly OpCo updates will be posted from this account, as opposed to having an OAT member publish them. [Read More Here](https://forum.arbitrum.foundation/t/opco-update-august-2026/31411?ref=blog.arbitrum.foundation) ### **\[RFC\] Operational Mandate: Arbitrum Stylus Developer Impact Oracle & Sybil-Resistant ROI Matrix** As current Domain Allocator and incentive programs approach their conclusion, the Arbitrum DAO faces a critical vulnerability: they are spending millions of dollars on developer grants without a programmatic way to track post-grant retention. This proposal introduces the Stylus Developer Impact Oracle, a custom Dune Analytics and SQL tracking architecture designed to audit the historical ROI of concluding programs and provide a verifiable data baseline for all future Arbitrum DAO allocations. [Read the Full Proposal](https://forum.arbitrum.foundation/t/rfc-operational-mandate-arbitrum-stylus-developer-impact-oracle-sybil-resistant-roi-matrix/31401?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #025\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Arbitrum Foundation Reports First Half 2026 Progress Update URL: https://blog.arbitrum.foundation/arbitrum-foundation-reports-first-half-2026-progress-update/ Last updated: 2026-09-03T07:52:16.000Z - *The network processed 478 million transactions in the half, taking its lifetime total to 2.7 billion, with ecosystem GDP of $206 million for the period and $1.7 billion cumulative since launch* - *Average monthly stablecoin transfer volume exceeded $70 billion and Arbitrum ranked first in tokenised real-world asset deployments* - *Income of $6.19 million accrued to the ArbitrumDAO across four lines in the half and the collective gross margin on protocol revenue rose to more than 97%* - *Arbitrum Expansion Program licence fees were 35% of ArbitrumDAO income in July, the first month with Robinhood Chain on mainnet* --- The Arbitrum Foundation today published its Bi-Annual Progress Update for the first half of 2026, covering the six months to 30 June. The report sets out activity across Arbitrum One and the Arbitrum Chains built on its technology, together with the Foundation's own operational and financial details. It also carries the headline figures for ArbitrumDAO's income and treasury. The ecosystem's income accrued across four lines in this period and in July the Arbitrum Expansion Program became a material line as Robinhood Chain launched its public mainnet. “The first half of 2026 shows the Arbitrum ecosystem's financial profile broadening. It now looks like a diversified economic enterprise, with four income lines at a blended gross margin above 97% and an expansion programme that accounted for 35% of the ArbitrumDAO's July income, the first month Robinhood Chain was on mainnet,” said Brendan Ma, Head of Investment Strategy, the Arbitrum Foundation. “The demand behind those numbers comes from the convergence of traditional finance and onchain finance that is happening today on the Arbitrum platform. Against subdued market conditions across the industry, the ecosystem’s growth has accelerated since the half ended. On July’s figures, total income for the third quarter is already on track to exceed the second quarter by more than 40%.” ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/09/Numbers_5_1080x1350.jpg) ### **Ecosystem Income and Margins** Income of $6.19 million accrued to the ArbitrumDAO from four lines during the half: Arbitrum One transaction fees, Timeboost, Arbitrum Expansion Program (AEP) licence fees and treasury income. The collective gross margin on protocol revenue exceeded 97%, up from more than 90% for full-year 2025. Under the Arbitrum Expansion Program, Arbitrum chains that settle outside Arbitrum One and Arbitrum Nova return 10% of net protocol revenue to the Arbitrum ecosystem. Robinhood Chain went live on mainnet on 1 July 2026 and contributes under the programme. In July, AEP licence fees of $360,000 were 35% of ArbitrumDAO income. ### **Enterprise Adoption and the Arbitrum Barbell Strategy** Arbitrum's barbell strategy places a liquid public chain, Arbitrum One, at one end and purpose-built Arbitrum chains for enterprises at the other, both on the same technology stack. Each Arbitrum chain contributes to the ecosystem: chains settling to Arbitrum One through the fees they pay and chains settling elsewhere under the AEP. Robinhood Chain, a dedicated Arbitrum chain built by Robinhood and settling to Ethereum, launched its public testnet in February 2026 and processed more than 200 million transactions before its public mainnet launch on 1 July. Robinhood Chain follows its issuance of Stock Tokens on Arbitrum One in June 2025. Arbitrum ended the half ranked first by tokenised real-world asset deployments, according to RWA.xyz, with more than 2,000 assets deployed. Ecosystem GDP was $206 million for the half, taking the cumulative figure since launch to $1.7 billion. LG Electronics announced a pilot onchain advertising network on Arbitrum, Mastercard expanded stablecoin settlement support to assets on the network and PayPal's PYUSD peaked at $475 million on Arbitrum in the first quarter. The Arbitrum Foundation took part in more than 15 capital markets events and engaged with more than 150 institutional investors in the half. Independent research coverage also grew. FalconX, a digital asset prime brokerage with $11 billion in assets under management, published a report to its institutional client base that described Arbitrum as “the AWS of blockchains” and modelled Robinhood Chain's effect on long-term protocol economics. Canary Capital, which manages approximately $400 million, initiated coverage with a report covering Robinhood Chain, the adoption trajectory and the long-term investment case for the platform. ### **ARB Supply and Capital Discipline** As of 17 August 2026, approximately 9.23 billion ARB, or 92.3% of total supply, was unlocked or held in the ArbitrumDAO treasury. The remaining 0.77 billion ARB, 7.7% of total supply, is the balance of the original vesting schedule, with the final vest arriving in March 2027. ARB holders govern the ArbitrumDAO and direct its assets and income. In addition to the income described above, the DAO held $125 million in non-native treasury assets, excluding ARB, at 30 June 2026, which supports the capital flexibility to pursue opportunities to grow the Arbitrum ecosystem and the DAO's income. The Foundation, which holds ARB in its own treasury, allocates capital predominantly through milestone-based funding, releasing funds against delivery to limit the market impact of ecosystem spending and aligning major capital deployments with performance milestones. In the six months to 30 June, less than $200,000 of the Foundation's ecosystem grants was issued upfront without milestone conditions. Read the full report [here](https://docs.arbitrum.foundation/assets/files/ArbitrumFoundationBiannualReport2026H1-8a1f34ae10b0ecb2c0802914e61d1485.pdf?ref=blog.arbitrum.foundation). ### Builder's Block #024: Robinhood Chain Commits $1M in Funding to Open House & ArbOS Elara Now Live URL: https://blog.arbitrum.foundation/builders-block-024-robinhood-chain-commits-1m-in-funding-to-open-house-arbos-elara-now-live/ Last updated: 2026-08-26T13:01:46.000Z 💡 ****What's Important This Week** ⚙ ArbOS Elara Upgrade is Now Live on the Arbitrum Platform 🔒 ZK is Coming to Arbitrum One & Dedicated Blockchains đŸ’Ș Robinhood Chain Continues to Back Founders at Open House Singapore ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### **Robinhood Chain Continues to Back Open House Singapore** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/rhc.png) One of the fastest growing chains is backing the next generation of founders. Robinhood Chain has committed $1M in funding to early-stage teams building through Arbitrum's Open House. Teams looking to bring a finance idea onchain can apply to our upcoming 3-week online Buildathon. [Register for the Online Buildathon](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) ### **ArbOS Elara Upgrade Live on Arbitrum** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/arbos-elara.png) Following approval through Arbitrum governance, the ArbOS Elara upgrade is now live on the Arbitrum Platform, bringing new capabilities to dedicated blockchains and important improvements to Arbitrum One. [Read More Here](https://x.com/ArbitrumDevs/status/2090503882283618360?s=20&ref=blog.arbitrum.foundation) ### **ZK Settlement is Coming to Arbitrum** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/zk-arb.png) This paves the way for private Arbitrum chains and allows for faster Ethereum withdrawals (from days to hours). Thanks to Succinct Labs and Offchain, Arbitrum chains will be able to implement this new technology soon. [Read More Here](https://x.com/ArbitrumDevs/status/2090437767293485163?s=20&ref=blog.arbitrum.foundation) --- ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### **What Ethereum Developers Need To Know Before Deploying to Arbitrum** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/jess-eth-devs.jpeg) The Arbitrum Platform offers a familiar experience for Ethereum devs, but there are a few differences that can impact how contracts behave. From transaction ordering to dynamic pricing, @0xjesstech breaks down what they should know before deploying to Arbitrum One. [Read the Article](https://x.com/0xjesstech/status/2089729853574480214?s=20&ref=blog.arbitrum.foundation) ### **What Would Change If Arbitrum Replaced Its State Tree** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-ed8d55c4-bbe6-4521-8aa6-4743c46edebe.jpeg)](https://x.com/hummusonrails/status/2085370161075294208?s=20&ref=blog.arbitrum.foundation) Offchain published an RFC on the Arbitrum forum a few weeks ago asking the community what would change for you if Arbitrum replaced that structure. The work is in the research phase now, but before you can even contribute you need to understand what's at stake. [Read the Article](https://x.com/hummusonrails/status/2085370161075294208?s=20&ref=blog.arbitrum.foundation) ### **Prototype to Production Fireside with OpenZeppelin** 0:00 /0:30 1× Founders should be asking "How will this break?" long before they push to production. Real production readiness is having an executable playbook before a crisis hits. Hear from OpenZeppelin sharing battle-tested advice - exclusively from Open House. ### **AI Writes More Code Now. So What Becomes the Developer's Job?** 0:00 /1:13 1× An empty wallet isn’t a successful onboarding flow. AI can dramatically reduce the time spent writing code, but that makes planning, review and testing more important, not less. OpenZeppelin how Claude, Codex & other agentic coding tools can be used during feature development without blindly trusting the output. --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### **Loaf Markets: Pioneers of the Programmable Economy in Tokenization** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/loaf.jpeg) Loaf Markets is bringing billions of dollars of physical assets to the programmable economy: AI & data - Terafab, Landmarks - Eiffel Tower, Public assets - Golden Gate Bridge, and eventually the entire physical world. Using Arbitrum’s deep liquidity, @Loafmarkets are turning physical assets into onchain markets anyone can trade 24/7. [Check It Out](https://x.com/arbitrum/status/2090569826288726412?s=20&ref=blog.arbitrum.foundation) ### **T3tris Hits $12M in TVL** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/twtris.png) T3tris Finance, among the 10 teams that came out of stealth from our first Arbitrum Mentorship Program, hits $12M in TVL across Arbitrum One and Robinhood Chain since launching in July. [Read More Here](https://x.com/arbitrum/status/2088029791047827756?s=20&ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### **What Does Multidimensional Gas Pricing Change for Developers?** 0:00 /1:07 1× It changes how resources are accounted for, letting devs optimize their applications across 6 resource dimensions - Compute, Storage Read + Write, Storage Growth, History Growth, & Calldata. Watch Ali from Entropy Advisors break it down. ### **Nitro v3.11.3 is Now Fully Released** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/nitro.jpeg) This update improves validator stability, more accurate transaction filtering, and clearer debugging tools through better RPC error messages, tracing, and logging for filtered transactions. The source code is published on GitHub and the standard Docker images are live on Docker Hub. [See What It Brings](https://github.com/OffchainLabs/nitro/releases/tag/v3.11.3?ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### **Open House Singapore Online Buildathon Starts Sept 14** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-97fcea33-cb83-45e2-81f4-876e88c6c412.png)](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) Open House Singapore will kick off with a 3-week, online Buildathon on September 14, designed to help founders refine their direction and iterate towards an MVP. Teams that are looking to bring novel financial products to the Arbitrum Platform are welcome to apply today. [Register for the online Buildathon ](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### **Arbitrum Security Program** The Arbitrum Foundation proposes to continue and evolve the Arbitrum Audit Program (AAP) - launched on 1 August 2025 with a one-year mandate into a broader Arbitrum Security Program (ASP), running for a further 12 months on a rolling-application basis. [Read the Full Proposal](https://forum.arbitrum.foundation/t/arbitrum-security-program/31207?ref=blog.arbitrum.foundation) ### **\[CONSTITUTIONAL\] AIP: Authorize Priority Gas Auctions and Establish the Fast Feed** This AIP proposes to combine two separate actions into a single on-chain vote for the ArbitrumDAO to consider: transitioning Arbitrum One's ordering policy from Timeboost to Priority Gas Auctions and sunsetting Timeboost on Arbitrum Nova; and establishing the Fast Feed, a paid and authenticated data streaming product for Arbitrum One. [Read the Full Proposal](https://alt.gov.arbitrum.foundation/proposal/104933844856336554027758452704713321330340501652892001249184191934279866979282?govId=eip155:42161:0xf07DeD9dC292157749B6Fd268E37DF6EA38395B9&ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #024\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Builder's Block #023: $415k in Prizes at Open House Singapore - Apply Now URL: https://blog.arbitrum.foundation/builders-block-023-415k-in-prizes-at-open-house-singapore-apply-now/ Last updated: 2026-08-13T11:11:31.000Z 💡 ****What's Important This Week** 🇾🇬 Open House is Coming to Singapore with $415k in Prizes & Grants ⚙ ArbOS 61 Elara: Contract Size Limits + Compliance Controls ⚠ $1M+ Raised by Teams from the Arbitrum Mentorship Program ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### **Open House Singapore: 3-Week Buildathon Applications Now Open** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-62a17ea8-1fe6-4293-af03-605a92d6252e.png)](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) Our global founder program, Open House Singapore, is kicking off its first phase with a 3-week online Buildathon starting September 14th, designed to help early-stage teams go from idea to product. During this phase, teams get technical and infra support from ecosystem partners, win $115K prizes, and earn a spot at our in-person Founder House in Singapore [Register for the Online Buildathon](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) ### **ZK on Arbitrum: A Faster Path Without Removing Optimistic Settlement** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-bb85dcc2-52a5-4863-95e7-af341e26ec05.jpeg)](https://x.com/zkLumi/status/2085021055224287578?s=20&ref=blog.arbitrum.foundation) Offchain's research team is exploring how ZK proofs could be integrated into Arbitrum’s settlement process, with the goal of enabling faster transaction finality while preserving the security guarantees and fallback mechanisms of optimistic rollups. The tweet outlines a potential path toward ZK settlement for Arbitrum One and chains built on the Arbitrum platform. [Read the Breakdown](https://x.com/zkLumi/status/2085021055224287578?s=20&ref=blog.arbitrum.foundation) ### **ArbOS Elara Brings 96kb Smart Contracts & Protocol-Level Compliance** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-61e07f28-a567-413f-b4b2-b66012cdda00.png)](https://x.com/ArbitrumDevs/status/2085357728889700726?s=20&ref=blog.arbitrum.foundation) ArbOS Elara introduces more programmable parameters including protocol-level compliance controls for dedicated blockchains, alongside improvements to fees, data availability, and Stylus capacity. This upgrade has been approved by the ArbitrumDAO for Arbitrum One and Arbitrum Nova, where it activates on Thursday, August 20, 2026, at 17:00 UTC. [See What This Means](https://x.com/ArbitrumDevs/status/2085357728889700726?s=20&ref=blog.arbitrum.foundation) ### **Arbitrum Mentorship Program Winners Announced** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-c2fd1c3d-040f-4f6f-93c3-f17715029a7d.png)](https://x.com/arbitrum/status/2086867276955873679?s=20&ref=blog.arbitrum.foundation) Earlier this year, the Arbitrum Foundation ran the first full cohort of the Arbitrum Mentorship Program. Ten teams made it through to Demo Day. Between them, they raised more than $1M over the course of the program, shipped on Arbitrum One and Robinhood Chain, and four walked away with a share of the $100,000 prize pool. [Check Out the Winners & What They’ve Built](https://x.com/arbitrum/status/2086867276955873679?s=20&ref=blog.arbitrum.foundation) --- ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### **How the New ArbOS Update Will Change the Way We build on Arbitrum** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-b4005023-fcd6-4f69-9daf-40cee6c65e5f.jpeg)](https://x.com/hummusonrails/status/2085729467549532619?s=20&ref=blog.arbitrum.foundation) ArbOS 61 Elara brings a major upgrade for Stylus developers: a 4× increase in the code size limit (24 KB → 96 KB), a larger WASM size ceiling, and changes to WASM multi-value support that could affect existing contracts. This article breaks down what you need to know before the upgrade goes live. [Read the Article](https://x.com/hummusonrails/status/2085729467549532619?s=20&ref=blog.arbitrum.foundation) ### **What Would Change If Arbitrum Replaced Its State Tree** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-ed8d55c4-bbe6-4521-8aa6-4743c46edebe.jpeg)](https://x.com/hummusonrails/status/2085370161075294208?s=20&ref=blog.arbitrum.foundation) Offchain published an RFC on the Arbitrum forum a few weeks ago asking the community what would change for you if Arbitrum replaced that structure. The work is in the research phase now, but before you can even contribute you need to understand what's at stake. [Read the Article](https://x.com/hummusonrails/status/2085370161075294208?s=20&ref=blog.arbitrum.foundation) ### **How Do You Prove You Know A Secret Without Revealing It Onchain? - A Beginners Guide** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-9b63e23c-fafe-4685-b2d2-5b132d2fe769.jpeg)](https://x.com/0xjesstech/status/2083175641017655438?s=20&ref=blog.arbitrum.foundation) How do you prove you know a secret without revealing it onchain? zkSNARKs make it possible. From commitments and witnesses to polynomial checks and onchain verification, this beginner’s guide walks through the full lifecycle of a zero-knowledge proof with practical examples. [Read the Article](https://x.com/0xjesstech/status/2083175641017655438?s=20&ref=blog.arbitrum.foundation) ### **ZeroDev Guide: Design Cross-Chain Wallet Funding Without Manual Bridging** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-d4b1463f-35bc-4df2-a768-5f1b3e5d5d95.jpeg)](https://www.zerodev.app/blogs/how-to-design-cross-chain-wallet-funding-without-manual-bridging?ref=blog.arbitrum.foundation) An empty wallet isn’t a successful onboarding flow. The real test comes when users fund their account and can immediately do what they came to do. Cross-chain funding should start with user intent, not bridges, gas, or network selection. [Read the Blog](https://www.zerodev.app/blogs/how-to-design-cross-chain-wallet-funding-without-manual-bridging?ref=blog.arbitrum.foundation) ### **Where Offchain Is Pushing Zero-Knowledge Forward** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-f10e838c-6398-4403-bf1c-b4c3903880ab.jpeg)](https://www.zerodev.app/blogs/how-to-design-cross-chain-wallet-funding-without-manual-bridging?ref=blog.arbitrum.foundation) From faster data verification and verifiable AI to confidential payments and stronger recursive proofs, Offchain is expanding what zero-knowledge technology can do while strengthening the foundations beneath it. [Read the Blog](https://www.zerodev.app/blogs/how-to-design-cross-chain-wallet-funding-without-manual-bridging?ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### **Stripe Now Supports USDC on Arbitrum** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-bdee1d69-9a39-4840-822a-886c6260c5cd.png)](https://x.com/arbitrum/status/2087196102265299189?s=20&ref=blog.arbitrum.foundation) Stablecoin accounts are becoming part of global finance. Supported in 100+ countries, Stripe Treasury gives eligible businesses a full financial account to receive, hold, and send USDC on Arbitrum. [More Details Here](https://x.com/arbitrum/status/2087196102265299189?s=20&ref=blog.arbitrum.foundation) ### **Total RWA Value on Arbitrum Hits $900 million** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-3c2f71ee-6d72-4675-93a6-5ba3d0d9fee2.png)](https://arbdata.com/ecosystems/robinhood/stock-tokens?ref=blog.arbitrum.foundation) Total Tokenized Value on the Robinhood Chain reached a new high of $29M. Finance is becoming programmable with Arbitrum under the hood. [Check Out the Data](https://arbdata.com/ecosystems/robinhood/stock-tokens?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### **ArbOS Elara: What It Enables for Arbitrum One & Dedicated Blockchains** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-c0991f82-d28a-42c8-a8ad-0ea59687e905.jpeg)](https://x.com/ArbitrumDevs/status/2085729584696147998?s=20&ref=blog.arbitrum.foundation) ArbOS Elara has been approved by the ArbitrumDAO.Once live, the upgrade will provide chain operators with more programmable controls over compliance, fees, and data infrastructure, while expanding capacity on Arbitrum One. [Check Out What’s Coming ](https://x.com/ArbitrumDevs/status/2085729584696147998?s=20&ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### **Open House Singapore online Buildathon kicks off September 14** [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/data-src-image-97fcea33-cb83-45e2-81f4-876e88c6c412.png)](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) Open House Singapore will kick off with a 3-week, online Buildathon on September 14, designed to help founders refine their direction and iterate towards an MVP. Teams that are looking to bring novel financial products to the Arbitrum Platform are welcome to apply today. [Register for the online Buildathon ](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-singapore-buildathon) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### **\[RFC\] New state representation for Arbitrum: proof-format change and request for feedback** Offchain is researching replacing the current Merkle-Patricia Trie with a new verifiable data structure. This change aims to scale Arbitrum chains to new heights that optimizing the MPT cannot alone achieve, continuing the work to improve Arbitrum chains over time. [Read the Full RFC ](https://forum.arbitrum.foundation/t/post-quantum-cryptography-risk-in-arbitrum-smart-contracts-a-technical-overview/31027?ref=blog.arbitrum.foundation) ### **Post-Quantum Cryptography Risk in Arbitrum Smart Contracts — A Technical Overview** Quantum computing could eventually break the cryptography securing today’s smart contracts. This technical overview looks at where Arbitrum contracts may face post-quantum risk - from ecrecover and EIP-712 to Chainlink feeds, Safe, and permit() - and what migration paths already exist. [Read the Full Overview](https://forum.arbitrum.foundation/t/post-quantum-cryptography-risk-in-arbitrum-smart-contracts-a-technical-overview/31027?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #023\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Open House Singapore: Applications Are Now Open URL: https://blog.arbitrum.foundation/open-house-singapore-applications-are-now-open/ Last updated: 2026-08-11T17:04:38.000Z Applications are now open for Open House Singapore, the Southeast Asia hub of Arbitrum’s global founder program in 2026, welcoming founders from across the region to build the next generation of onchain products. Following the successful Open House programs in New York City and London, the program follows the format that has already helped hundreds of builders advance their projects this year: a three-week online Buildathon from September 14 to October 4, followed one month later by a three-day, in-person Founder House. [Register Now for the Online Buildathon](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=arbitrum-blog&utm%5Fmedium=blog&utm%5Fcampaign=oh-singapore-buildathon) During the online Buildathon, builders can develop an existing project or codebase with support from frequent feedback sessions designed to help them refine their direction, iterate quickly, and work toward an MVP. Founder-focused workshops complement this process, covering key areas across product development, go-to-market strategy, user experience, agentic commerce, wallet infrastructure, emerging market opportunities, and much more. At the Founder House, teams will shift their focus toward sharpening their product and defining a path to market. Sessions will cover product direction, value proposition, customer discovery, and go-to-market strategy, followed by structured exercises that challenge teams to reconsider their assumptions and identify a stronger wedge. Dedicated mentorship, networking opportunities, and pitch sessions will give founders further opportunities to test their thinking and strengthen both their product and commercial strategy. Throughout the program, founders will work directly with teams from the Arbitrum Foundation, Offchain, and ecosystem partners, gaining hands-on support across product development, go-to-market strategy, fundraising, and ecosystem growth. With $415k in prizes and milestone-based grants available, Open House Singapore is built for early-stage founders at different points in the development process - whether they are validating a new idea, refining an existing product, or building their first onchain product. The program combines practical expertise, direct feedback, and financial support to help promising projects develop into viable businesses. ## **Prize Breakdown** A total of $415k has been earmarked for Open House Singapore across its Buildathon and Founder House programs. The Arbitrum Foundation and the Robinhood Chain jointly sponsor the prizes and grants for OH Singapore. ### **OH Singapore Buildathon** **Open Category - $70K** The top three Buildathon winners will take home a share of the $70K prize pool. The prize split is as follows: - 1st Place - $40K USDC - 2nd Place - $20K USDC - 3rd Place - $10K USDC A minimum of one of the top three spots will be reserved for a project building on the Robinhood Chain. **Promising Products Track - $15K** - 1st Place - $7K USDC - 2nd Place - $5K USDC - 3rd Place - $3K USDC A special category has been reserved for up and coming new products entering frontier areas like AI agents, new financial primitives and more. The top three winners under this category will share $15K in prizes. At least one of the top three spots is reserved for products building on the Robinhood Chain. **Grants - $30K** In addition to the above prizes, $30K USDC has been reserved as grants by the Arbitrum Foundation for winning teams on a case-by-case basis. Except for under the Promising Products Track, all the prize money amounts above are to be split 50/50 into upfront payments and milestone based payouts. ## **What Open House London Delivered** New York established the benchmark, London demonstrated how quickly the program is evolving. 350 builders participated in the online Buildathon; **278 projects were submitted**. **140 founders joined the in-person Founder House**. $315k in prizes has been allocated for the winners across both phases of the program. What stood out was the breadth of ideas being built. Teams explored everything from AI-powered financial infrastructure and decentralized identity to prediction markets, institutional tooling, and consumer applications. Across categories, founders focused on solving real-world problems while leveraging the unique advantages of onchain systems. Several winning teams are already continuing conversations around partnerships, ecosystem integrations, and fundraising, demonstrating the program’s ability to attract ambitious founders and accelerate promising projects beyond the competition itself. [Secure Your Spot Now](https://arbitrum-singapore.hackquest.io/?utm%5Fsource=arbitrum-blog&utm%5Fmedium=blog&utm%5Fcampaign=oh-singapore-buildathon) ### From Idea to Raising $1M+ In Eight Weeks: Inside Arbitrum’s First Mentorship Cohort URL: https://blog.arbitrum.foundation/from-idea-to-raising-1m-in-eight-weeks-inside-arbitrums-first-mentorship-cohort/ Last updated: 2026-08-11T08:13:44.000Z Earlier this year, the Arbitrum Foundation ran the first full cohort of the Arbitrum Mentorship Program, an eight-week, equity-free accelerator built for early-stage teams building the next generation of products in the programmable economy. The idea was straightforward: take strong founders, give them direct access to the mentors, investors, and ecosystem partners that usually take months to reach, and help them get to the point where they can ship, launch, and raise. Ten teams made it through to Demo Day. Between them, they raised more than $1M over the course of the program, shipped on Arbitrum One and Robinhood Chain, and four walked away with a share of the $100,000 prize pool. Here is how the eight weeks went. ### **By the numbers** - 902 applications from every major region - 13 teams selected at 1.4% acceptance rate; 10 teams made it to the Demo Day - [$1M+](https://x.com/search?q=%241M%2B&src=cashtag%5Fclick&ref=blog.arbitrum.foundation) raised by cohort teams since the start of the program - 5 teams launched on Robinhood Chain testnet or mainnet - 40+ investor introductions made ahead of Demo Day - 25+ VCs in the room on Demo Day - $100,000 prize pool awarded across four winners ### **Meet The Cohort** The first cohort brought together 13 ambitious teams across five different verticals: tokenization, DeFi infrastructure, payments, consumer, and agentic finance. While teams were early-stage, founders arrived with successful startup exits in the past or deep operating experience. Seven of the thirteen are new to Arbitrum, having previously built elsewhere or still in pre-deployment. That was intentional: the program is designed to attract exceptional founders into the ecosystem, not just accelerate those already building within it. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/image.png) Cohort 1 was early stage, but not inexperienced. The ten teams that went through to Demo Day: - [Tilt Protocol](https://x.com/tiltprotocol?s=20&ref=blog.arbitrum.foundation): an operating system for tokenised RWA hedge funds, turning quant strategies into deployable onchain funds. - [Kustodia](https://x.com/Kustodia%5Fmx?s=20&ref=blog.arbitrum.foundation): a safety layer for high-value transactions, with real onchain escrow. - [T3tris](https://x.com/0xT3tris?s=20&ref=blog.arbitrum.foundation): vault infrastructure that lets asset managers create vaults and deploy across strategies. - [Carbon](https://x.com/CarbonTerminal?s=20&ref=blog.arbitrum.foundation): an onchain perps platform expanding into RWA and TradFi instruments. - [Bond Credit](https://x.com/bondoncredit?s=20&ref=blog.arbitrum.foundation): credit infrastructure for autonomous AI agents, with onchain credit scoring and credit vaults. - [Prism](https://x.com/PrismFi%5F?s=20&ref=blog.arbitrum.foundation): a consumer superdapp combining an AMM, launchpad, prediction markets, and perps. - [Capa](https://x.com/capa%5Ffi?s=20&ref=blog.arbitrum.foundation): payments infrastructure for cross-border flows. - Stealth: a composable proactive AMM DEX with HFT grade liquidity. - [LayerV](https://x.com/layerv%5Fofficial?s=20&ref=blog.arbitrum.foundation): an options DEX on Arbitrum. - [Twyne](https://x.com/twynexyz?s=20&ref=blog.arbitrum.foundation): a universal credit delegation layer that unlocks unused borrowing power across lending markets. ### Sessions and Mentorship Over eight weeks, teams sharpened their positioning, strengthened their products, built investor relationships, and moved toward product launch. The first month focused on getting teams investment-ready, helping founders refine their narrative, fundraising strategy, tokenomics, partnerships, go-to-market, and pitch. The second month focused on putting those foundations to work through hands-on clinics, deep dives with the Arbitrum Foundation and Offchain teams, and direct investor introductions, culminating in Demo Day. Throughout the program, founders also had regular 1:1 access to ecosystem teams, mentors, investors, and partners to work through real challenges, get direct product feedback and accelerate their path to launch. ### What Builders Shipped Several teams hit major milestones throughout the program, moving from testnet to mainnet, launching new products and features on Arbitrum, and sharpening their positioning and go-to-market strategy. Carbon shipped across multiple fronts in eight weeks. The team moved CFDs from private to open beta after reaching 400+ users, launched a live solver with a TradFi broker and BitGo as custodian, and secured $1M in committed capital for its CLP with another $2.5M in the pipeline. LayerV made key progress toward launch, securing two market makers to provide liquidity across its order book and RFQ layer, onboarding its first licensed U.S. asset manager for its vaults, and completing V1 of its risk, trading, and liquidation engines. Capa made strong progress across product and partnerships, growing volume 150% month over month and signing a key commercial deal. The team also added support for Robinhood Chain and expanded its stablecoin offering with USDC and USDT alongside MXNB. Tilt and T3tris made strong progress building for asset managers throughout the program. Tilt onboarded seven pilot fund managers and launched AI Tilt, while T3tris grew its curator community to 50+ and shipped on Arbitrum and Robinhood Chain. Kustodia and Bond Credit brought trust-critical infrastructure into production. Kustodia launched private and agentic escrow with USDC and MXNB, while Bond Credit shipped its watchtower and grew TVL 10x to . Twyne expanded its collaboration across the ecosystem. Arbitrum One is ready for launch, Morpho is in audit, and Lido has signed on for a pilot. Together, these collaborations are helping bring both sides of the lending market together for credit delegation. ### Demo Day & Winners Cohort One closed with Demo Day on 7 July 2026, where all ten teams pitched to a room of investors and partners for a share of the $100,000 prize pool. More than 60 investors’ introductions had been made for cohort teams in the lead up to Demo Day, and over 25 VCs turned out on the day itself, alongside ecosystem partners and mentors from across the program. The feedback from VCs was that the cohort showcased a very high level of quality and potential. Four teams took home the $100,000 prize pool: Carbon, LayerV, T3tris, and Capa. The winners cut across the stack, from perps and options to vault infrastructure and payments, and two of the four are building on Robinhood Chain. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/08/image-1.png) ### What's next Demo Day marks a milestone for the cohort, but our work with these teams continues. We’ll stay closely involved as they build, launch, and raise, connecting them with the investors, partners, and resources they need along the way. The goal of the Arbitrum Mentorship Program is to help early-stage teams build and launch category-defining financial products for the programmable economy. And we’re just getting started. Cohort Two is coming soon. ### Builder's Block #022: Arbitrum’s Mid-Year Recap & New Stylus Hardhat Plugin URL: https://blog.arbitrum.foundation/builders-block-022-arbitrums-mid-year-recap-new-stylus-hardhat-plugin/ Last updated: 2026-07-30T13:35:16.000Z 💡 ****What's Important This Week** 🚀 Arbitrum's 2026 Mid-Year Recap: Milestones & Ecosystem Growth ⚙ Build Stylus Contracts with CoBuilders’ New Hardhat Plugin Suite ⚠ Builder Feedback Request on Arbitrum’s New State Representation ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### **Arbitrum H1 2026: The Programmable Economy is Accelerating** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/h1.jpg) H1 2026 was defined by momentum. Across ecosystem growth, institutional adoption, and landmark launches such as Robinhood Chain mainnet, Arbitrum strengthens its position as the finance-native platform with enterprise-grade infrastructure to power the programmable economy. [Read More Here](https://x.com/arbitrum/status/2077388239070020041?s=20&ref=blog.arbitrum.foundation) ### **Hardhat 3 Plugin Suite for Arbitrum Stylus** @cobuildersxyz went live with their Hardhat 3 plugin suite. Developers can now compile, test and deploy Rust and Solidity smart contracts together in the Hardhat plugin suite with one single command. > Until now, building on [@arbitrum](https://x.com/arbitrum?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) Stylus meant having to leave your Hardhat workflow behind. > > Not anymore. > > We shipped a Hardhat 3 plugin suite that brings the full Stylus lifecycle into Hardhat. Rust contracts right next to Solidity. > > đŸ§” [pic.twitter.com/Rg5CcRt3r2](https://t.co/Rg5CcRt3r2?ref=blog.arbitrum.foundation) > > — CoBuilders (@cobuildersxyz) [July 14, 2026](https://x.com/cobuildersxyz/status/2077097634788245986?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) [Try Now & Start Building](https://github.com/CoBuilders-xyz/hardhat-arbitrum-stylus?ref=blog.arbitrum.foundation) --- ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### **How Robinhood Chain Apps Can Simplify Wallet Funding With ZeroDev Smart Routing Address** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/zerodev-RHC-blog.jpeg) Building on Robinhood Chain? ZeroDev Smart Routing Address gives each user one deposit address, routes supported funds into the right smart account, and reduces manual bridge-and-transfer friction. Fund once. Stay in-app. Activate faster. [Read the Blog](https://www.zerodev.app/blogs/how-robinhood-chain-apps-can-simplify-wallet-funding-with-zerodev-smart-routing-address?ref=blog.arbitrum.foundation) ### **Build Your First Robinhood Chain App** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/0726_Arbitrum_Foundation_Blog_Robinhoodchain_1200x600_V2-1.png) Robinhood Chain lets developers build with the same EVM tools and workflows they already know: Solidity contracts, Foundry deploys, Viem reads, Wagmi writes, ERC-20 approvals. Here's how to build your first Robinhood Chain app by Ben Greenberg [Read the Article](https://x.com/ArbitrumDevs/status/2080357165739692286?s=20&ref=blog.arbitrum.foundation) ### **A Beginners Guide to Privacy Onchain** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/zkp-jess.jpeg) As more financial applications move onchain, privacy will become essential for adoption at scale. This beginner-friendly guide breaks down how zero-knowledge proofs work, why they matter, and how they could enable a more private, scalable future for blockchain applications. [Read the Article](https://x.com/0xjesstech/status/2080295308894834813?s=20&ref=blog.arbitrum.foundation) ### **Robinhood Chain for Ethereum Developers - what you need to know** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/what-you-need-to-know.jpeg) Layer 2s like Robinhood are EVM-Compatible, but there are a handful of semantic changes we need to consider when deploying contracts across multiple chains. This article is a list of considerations for Ethereum developers deploying to Robinhood. [Read the Article](https://x.com/0xjesstech/status/2079909645359939818?s=20&ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### **How WalletConnect brings connectivity to payments in Arbitrum** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/walletconnect-arb.png) WalletConnect brings connectivity to Arbitrum payments by enabling businesses to integrate with the largest network of digital wallets through a single, future-proof integration. Learn how PSPs and merchants can access Arbitrum's settlement rails without building custom integrations across chains and assets. [Read the Article](https://walletconnect.com/blog/arbitrum-drives-payments-with-walletconnect?ref=blog.arbitrum.foundation) ### **Total RWA Value on Arbitrum Hits $900 million** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/900m.jpeg) The tokenization of real-world assets continued to gain momentum, with total RWA value on Arbitrum surpassing $900 million. As institutions increasingly explore onchain finance, Arbitrum remains at the forefront of powering the programmable economy. ### **Sedona Launches on Arbitrum** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/sedona.jpeg) Privacy-first neobank Sedona is bringing private payments, markets, and financial services to Arbitrum. Discover why Sedona chose Arbitrum as the foundation to scale its vision of a new kind of onchain banking experience. [Read More Here](https://x.com/SedonaFi/status/2077771266593903043?s=20&ref=blog.arbitrum.foundation) ### **Bitget Wallet X Integrates Arbitrum** Bitget Wallet X, Bitget Wallet’s developer infrastructure stack, has integrated Arbitrum to help developers and applications access deeper onchain liquidity, market data, and infrastructure across ecosystems. > Hello fellow developers/builders > > If you're building wallets, DeFi protocols, payment products, or autonomous agents, we'd love to connect. > > This is our official account of the Bitget Wallet eng team, and will be the official source of all developer updates, tech insights, and
 [pic.twitter.com/SJ25s5RbDs](https://t.co/SJ25s5RbDs?ref=blog.arbitrum.foundation) > > — Bitget Wallet Devs (@BitgetWalletX) [July 22, 2026](https://x.com/BitgetWalletX/status/2079869529644286340?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### **How ZeroDev Simplifies Wallet, Gas, & Cross-Chain Friction** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/Arbitrum-ZeroDev-Blog-Cover-1-1.png) If you’re spending time solving wallet onboarding, gas management, or cross-chain UX, this is worth a read. Explore how @zerodev\_app’s account infrastructure stack can help simplify these challenges for applications built on the Arbitrum Platform. [Read More Here](https://x.com/arbitrum/status/2081766343812976775?s=20&ref=blog.arbitrum.foundation) In addition, teams building on Arbitrum can now get 3 months of @zerodev\_app Growth Plan: 100,000 credits, Gas sponsorship, Bundler infrastructure. Use code: ARBZERODEV [Claim the Offer & Start Building](https://x.com/arbitrum/status/2082166707162948094?s=20&ref=blog.arbitrum.foundation) ### **Arbitrum Nova Minimization** If you're still building or holding funds on Arbitrum Nova, now's the time to act. We are currently halfway through the 90-day migration window, during which time developers and users are encouraged to migrate from Arbitrum Nova to Arbitrum One. Learn more here. đŸ‘‡đŸ» > Important Update on Arbitrum Nova. > > As per a recent proposal, the ArbitrumDAO has voted to minimize Arbitrum Nova by transitioning it into a maintenance-oriented state with reduced capacity and deprioritized support. > > A thread on what this means for developers and users đŸ‘‡đŸ» > > — Arbitrum Developers (@ArbitrumDevs) [June 9, 2026](https://x.com/ArbitrumDevs/status/2064311595619192983?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### **Aftermovie: Founder House London** Open House London ended with an incredible 3-days of shipping on the Arbitrum Platform: $300K in prizes and grants, 140 founders from across the globe, & 15+ financial products out of stealth Here's what went down đŸ‘‡đŸ» 0:00 /0:31 1× Follow [@ArbitrumDevs](https://x.com/ArbitrumDevs?ref=blog.arbitrum.foundation) & stay tuned for the full recap. --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### **\[RFC\] New state representation for Arbitrum: proof-format change and request for feedback** Offchain is researching a change to how Arbitrum commits to its state: replacing the Merkle-Patricia Trie (MPT) with a new verifiable data structure (plus auxiliary verifiable structures). The primary motivation for this change is to scale Arbitrum chains to new heights that optimizing the MPT cannot alone achieve. [Read the Full RFC](https://forum.arbitrum.foundation/t/rfc-new-state-representation-for-arbitrum-proof-format-change-and-request-for-feedback/31066?ref=blog.arbitrum.foundation) ### **Arbitrum Growth Circles: Final Report** AGC Cohort 1 was ran as a go-to-market bootcamp for early-stage DeFi teams building toward regulated, institution-facing use cases, organized around a shared cohort thesis - custodians as a distribution channel for DeFi protocols rather than generic startup support. This report closes out the program’s final milestone, summarizing what the cohort delivered and what was learned. [Read the Full Report](https://forum.arbitrum.foundation/t/arbitrumdao-factsheet-robinhood-chain-mainnet-launch/31041?ref=blog.arbitrum.foundation) --- ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/Copy-of-New-Arbitrum-Everywhere-slide-template-2-1-1.png) ## Stay Ahead of What's Next Subscribe to Builder’s Block for more updates, opportunities, and upcoming events from the Arbitrum ecosystem. Subscribe Email sent! Check your inbox to complete your signup. ### Build Your First Robinhood Chain App URL: https://blog.arbitrum.foundation/build-your-first-dapp-on-robinhood-chain/ Last updated: 2026-07-21T14:53:31.000Z A chain becomes very interesting when there is something useful to compose with. Robinhood Chain gives you the familiar EVM path first: Solidity contracts, Foundry deploys, viem reads, wagmi writes, ERC-20 approvals. The part worth learning is not a new VM. It is the asset layer you can build against once the contracts are live. The demo featured here is an index basket app. A user deposits Stock Tokens, receives an ERC-20 basket share, sees that share priced from Chainlink feeds, and can redeem back into the underlying components. ![A user interacts with a frontend that approves Stock Tokens and calls the basket contract, while the factory deploys baskets and Chainlink feeds provide pricing.](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/basket-dapp-architecture.png) You can run it locally, deploy it to Robinhood Chain testnet, fork-test the mainnet configuration, and inspect the live walkthrough at [robinhood-chain-dapp.vercel.app](https://robinhood-chain-dapp.vercel.app/?ref=blog.arbitrum.foundation) with the source at [github.com/hummusonrails/robinhood-chain-dapp-example](https://github.com/hummusonrails/robinhood-chain-dapp-example?ref=blog.arbitrum.foundation). ## The chain is custom, your app path is not Robinhood Chain is a custom Arbitrum Chain built on the Arbitrum stack. It uses Ethereum blobs for data availability and ETH as the gas token. For you, that means the first deploy looks like an EVM deploy: ```bash export PRIVATE_KEY=0x export RH_RPC_URL=https://rpc.testnet.chain.robinhood.com forge create src/MyContract.sol:MyContract \ --rpc-url $RH_RPC_URL \ --private-key $PRIVATE_KEY \ --broadcast ``` This is where the Arbitrum stack matters. Robinhood gets a dedicated chain with custom block production, pricing, infrastructure, and product controls. Builders still get the Ethereum contract model and tooling. ![Arbitrum as a platform: Arbitrum One is the credibly neutral public chain with deep shared liquidity, while Arbitrum Chains give teams the flexible, feature-rich execution environment Robinhood Chain runs on.](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/arbitrum-as-a-platform.png) That split is the whole reason the app path stays familiar while the chain is bespoke. Robinhood Chain runs on Arbitrum Nitro, the same technology as Arbitrum One, deployed as a dedicated chain. You inherit the parts you would not want to rebuild without doing anything: ![What the Arbitrum stack buys you for free: Ethereum settlement with fraud proofs and a trustless canonical bridge, ETH gas with tiny fees, ERC-4337 and EIP-7702 account abstraction on day one, and Stylus for Rust contracts alongside Solidity.](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/Screenshot-2026-07-07-at-18.07.12.png) State roots settle to Ethereum with fraud proofs, gas is paid in ETH, ERC-4337 and EIP-7702 account abstraction are live at canonical addresses, and Stylus lets a Solidity contract call a Rust one. None of that is work you take on to get a custom chain. ## Stock Tokens are ERC-20s with one extra accounting layer ![Raw ERC-20 balances remain stable for contracts, while the UI multiplier converts them into share-equivalent display amounts and can update after corporate actions.](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/stock-token-display-accounting.png) Stock Tokens are ERC-20 tokens. You can read balances, transfer, approve, and compose them the same way you would any other token. ```solidity IERC20 nvda = IERC20(NVDA_TOKEN_ADDRESS); uint256 balance = nvda.balanceOf(user); nvda.approve(spender, amount); nvda.transfer(recipient, amount); ``` The extra piece is corporate actions. Stock Tokens implement ERC-8056, the Scaled UI Amount extension. Raw token balances do not rebase when a split or dividend adjustment changes the economic relationship between one token and the underlying equity. Instead, the token exposes a `uiMultiplier()`. ```solidity interface IScaledUIAmount { function uiMultiplier() external view returns (uint256); function balanceOfUI(address account) external view returns (uint256); function totalSupplyUI() external view returns (uint256); function newUIMultiplier() external view returns (uint256); function effectiveAt() external view returns (uint256); } ``` The display conversion is: ```solidity underlyingShares = rawBalance * uiMultiplier / 1e18; ``` That lets protocols keep using raw ERC-20 units while wallets and UIs show share-equivalent amounts. If a split changes the multiplier, your accounting does not suddenly mutate under your contract. ## The basket app is small on purpose The sample app you can start learning from has two contracts and no owner. The interactive walkthrough prices one share live in the browser from the same Chainlink reads the contract uses: multiply each feed by the units backing a share, then sum. ![The live math behind one TRIO share: 0.4 TSLA plus 0.3 AMZN plus 0.3 NFLX, each priced from its Chainlink feed, summing to the value returned by sharePriceUsd() onchain.](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/Screenshot-2026-07-07-at-18.08.45.png) | Contract | Role | Control Surface | | ------------- | ----------------------------------------------- | ------------------------- | | BasketFactory | Deploys and records baskets | Permissionless | | BasketToken | Holds components, mints, redeems, prices shares | No owner, no upgrade path | The factory does not custody anything. It deploys a basket and records the address. ```solidity function createBasket( string calldata name, string calldata symbol, BasketToken.Component[] calldata components, uint256 maxPriceAge ) external returns (address basket) { basket = address(new BasketToken(name, symbol, components, maxPriceAge)); _baskets.push(basket); isBasket[basket] = true; emit BasketCreated(basket, msg.sender, name, symbol); } ``` Each basket stores a fixed list of components. A component is a token, a feed, and the raw amount of that token backing one basket share. ```solidity struct Component { address token; address feed; uint256 unitsPerShare; } ``` The mainnet demo basket uses TSLA, NVDA, and AAPL Stock Tokens with their Chainlink feeds: ```solidity function _mainnetComponents() internal pure returns (BasketToken.Component[] memory c) { c = new BasketToken.Component[](3); c[0] = BasketToken.Component(MAINNET_TSLA, MAINNET_TSLA_FEED, 0.4e18); c[1] = BasketToken.Component(MAINNET_NVDA, MAINNET_NVDA_FEED, 0.3e18); c[2] = BasketToken.Component(MAINNET_AAPL, MAINNET_AAPL_FEED, 0.3e18); } ``` One `TRIO` share is backed by `0.4 TSLA`, `0.3 NVDA`, and `0.3 AAPL`. On testnet, the demo uses real faucet Stock Tokens for TSLA, AMZN, and NFLX with mock Chainlink feeds. That is because the testnet gives you Stock Tokens to build with, while the production Stock Token feeds live on mainnet. ## Minting is the ERC-20 path you already know ![Minting starts with component approvals, then the basket pulls Stock Tokens and mints shares; redeeming burns shares and transfers components back.](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/mint-and-redeem-settlement-flow.png) From the frontend, minting is two steps: approve each component token, then call the basket. ```javascript await writeContract({ address: stockTokenAddress, abi: erc20Abi, functionName: "approve", args: [basketAddress, amount], }); await writeContract({ address: basketAddress, abi: basketTokenAbi, functionName: "mint", args: [shares, account], }); ``` Onchain, the basket pulls the required component amounts and mints shares in the same transaction. ```solidity function mint(uint256 shares, address to) external nonReentrant { if (shares == 0) revert ZeroShares(); uint256 count = _components.length; for (uint256 i = 0; i < count; i++) { Component memory c = _components[i]; uint256 amount = Math.mulDiv( c.unitsPerShare, shares, SHARE_UNIT, Math.Rounding.Ceil ); IERC20(c.token).safeTransferFrom(msg.sender, address(this), amount); } _mint(to, shares); emit Minted(msg.sender, to, shares); } ``` The rounding direction matters. Mint rounds up so a minter cannot underpay the basket reserves by dust. Redeem is the mirror image. Burn first, transfer components out, round down so reserves cannot be overdrawn. ```solidity function redeem(uint256 shares, address to) external nonReentrant { if (shares == 0) revert ZeroShares(); if (to == address(0)) revert ZeroAddress(); _burn(msg.sender, shares); uint256 count = _components.length; for (uint256 i = 0; i < count; i++) { Component memory c = _components[i]; uint256 amount = Math.mulDiv( c.unitsPerShare, shares, SHARE_UNIT, Math.Rounding.Floor ); IERC20(c.token).safeTransfer(to, amount); } emit Redeemed(msg.sender, to, shares); } ``` Notice what redeem does not do. It does not read an oracle. It does not check a price. It does not ask the factory for permission. That separation is deliberate. Pricing tells the UI what a share is worth. Redemption returns the tokens held by the contract. ## The repo gives you the full deploy path Start locally: ```bash git clone --recurse-submodules https://github.com/hummusonrails/robinhood-chain-dapp-example.git cd robinhood-chain-dapp-example pnpm install anvil pnpm run deploy:local pnpm run smoke pnpm run dev ``` The local deploy creates mock Stock Tokens, mock Chainlink feeds, the factory, and a demo `Tech Trio` basket. It also writes `apps/frontend/.env.local`, so the frontend can read the deployed addresses. For testnet, get ETH and Stock Tokens from the Robinhood Chain faucet, then run: ```bash PRIVATE_KEY=$YOUR_TESTNET_KEY pnpm run deploy:testnet ``` One Foundry script handles local, testnet, and mainnet by switching on `block.chainid`. ```solidity function run() external { vm.startBroadcast(); BasketFactory factory = new BasketFactory(); console2.log("FACTORY=%s", address(factory)); BasketToken.Component[] memory components; if (block.chainid == 4663) { components = _mainnetComponents(); } else if (block.chainid == 46630) { components = _testnetComponents(); } else { components = _localComponents(); } address basket = factory.createBasket("Tech Trio", "TRIO", components, MAX_PRICE_AGE); console2.log("DEMO_BASKET=%s", basket); console2.log("CHAIN_ID=%s", block.chainid); vm.stopBroadcast(); } ``` The testnet deployment behind the live walkthrough is: | Contract | Address | | ------------------ | ------------------------------------------ | | BasketFactory | 0xC1940D5fd58ce735A44a53f910852B12250F6a14 | | BasketToken (TRIO) | 0x7633e0920Ea46A8Ec54F61C95adECD391c01Edd4 | For mainnet, the same script uses the real TSLA, NVDA, and AAPL Stock Tokens with their Chainlink feeds: ```bash PRIVATE_KEY=$YOUR_MAINNET_KEY scripts/deploy.sh mainnet ``` Before spending mainnet gas, run the fork tests: ```bash pnpm run test:contracts pnpm run test:fork ``` The fork test creates the basket against live Robinhood Chain mainnet state, gives a test account Stock Token balances inside the fork, mints, checks backing, redeems, and verifies the supply returns to zero. ```solidity function test_mintAndRedeem_withRealStockTokens() public { deal(TSLA, alice, 1e18); deal(NVDA, alice, 1e18); deal(AAPL, alice, 1e18); vm.startPrank(alice); IERC20Metadata(TSLA).approve(address(basket), type(uint256).max); IERC20Metadata(NVDA).approve(address(basket), type(uint256).max); IERC20Metadata(AAPL).approve(address(basket), type(uint256).max); basket.mint(2e18, alice); assertEq(basket.balanceOf(alice), 2e18); assertEq(IERC20Metadata(TSLA).balanceOf(address(basket)), 0.8e18); basket.redeem(2e18, alice); assertEq(basket.totalSupply(), 0); assertEq(IERC20Metadata(TSLA).balanceOf(alice), 1e18); vm.stopPrank(); } ``` That is the development loop you want for this kind of app: mocks for speed, testnet for wallet flow, fork tests for live integration assumptions, mainnet only after the path is boring. The testnet deploy behind the live walkthrough is a real session. Five contracts, priced in ETH, verified on Blockscout, for a fraction of a cent of gas. ![A recorded testnet deployment on Robinhood Chain: an estimated 0.000122 ETH for the whole five-contract script, with all contracts verified on Blockscout and addresses handed to the frontend.](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/Screenshot-2026-07-07-at-18.10.31.png) That price comes from how the Arbitrum stack orders and settles work. Transactions arrive first come, first served into roughly 250ms blocks, get batched, and post to Ethereum as blob data. ![The life of a transaction on Robinhood Chain: your transaction hits the first-come-first-served sequencer, lands in a ~250ms block, is compressed into a batch, and settles to Ethereum for blob data availability. The fee is L2 execution gas plus the L1 data fee.](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/Screenshot-2026-07-07-at-18.11.46.png) ## What changes when the ERC-20 tracks a market asset A Stock Token still fits the ERC-20 interface, but the surrounding assumptions change. | Concern | Generic ERC-20 Habit | Stock Token Pattern | | ----------------- | ------------------------------------ | ------------------------------------------------------------------- | | User balance | Show balanceOf | Show balanceOfUI or apply uiMultiplier for share-equivalent display | | Price | Maybe no canonical feed | Read the per-token Chainlink feed on mainnet | | Corporate actions | Often ignored | Track multiplier updates and pending effective times | | Valuation | Token price only | Feed price already includes the multiplier | | Staleness | Crypto feeds may update continuously | Stock feeds follow market hours | | Exit path | Often price-gated | Prefer collateral redemption that does not depend on oracle reads | > “... Robinhood Chain lays the groundwork for an ecosystem that will define the future of tokenized real-world assets and enable builders to tap into DeFi liquidity within the Ethereum ecosystem.” > > Johann Kerbrat, SVP and GM of Crypto and International at Robinhood Read that as an engineering prompt, not a slogan. If equities, ETFs, feeds, and lending markets become normal onchain components, then app design gets more interesting than “deploy another token.” You can build products where ownership, pricing, collateral, and settlement are all programmable. ## From an app to your own Arbitrum chain The basket is one app on Robinhood Chain. Robinhood Chain is one chain on Arbitrum. That nesting is the point: the same stack meets you wherever you are on the path. You can ship an app on Arbitrum One first and tap into deep shared liquidity, lean on the team for deployment and go-to-market, and compose with the 1,000+ protocols already deployed. When your product needs its own blockspace, pricing, and controls, the same stack graduates you to a custom Arbitrum Chain, exactly the move Robinhood made. ![Arbitrum as a launch partner: start with a deployment on Arbitrum One, lean on a trusted team and deep liquidity across 1,000+ deployed protocols, and graduate to your own Arbitrum Chain when your product needs it.](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/arbitrum-launch-partner.png) The economics travel with you. Because Robinhood Chain settles to Ethereum as blob data on the Arbitrum stack, the cost to transact keeps trending down, recently around a tenth of a cent per transaction. ![Token Terminal data on the median transaction fee for Robinhood Chain, around $0.00127 per transaction and trending down, powered by Arbitrum and Ethereum.](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/x-post_1.5x_postspark_2026-07-07_18-16-58.png) Whether you stay as an app or become a chain, the contract model, the tooling, and the settlement guarantees are the same ones you used on day one. ## Start with the working system The index basket is not the only app to build on Robinhood Chain. It is a useful first one to explore because it touches the surfaces your own app will probably need: - Stock Token reads, approvals, and transfers - ERC-8056 display logic - Chainlink Stock Token feeds - Mint and redeem flows - Local mocks - Robinhood Chain testnet deployment - Blockscout verification - Mainnet fork tests - A Next.js frontend using wagmi and viem The useful pattern is not “copy this basket forever.” It is the shape of the work: keep contracts small, separate pricing from settlement, treat real-world asset details as part of the protocol surface, and test the same assumptions from local mocks to live mainnet state. Explore the fully functional index basket app deployed on Robinhood Chain with its interactive developer walkthrough and open source code on GitHub: [robinhood-chain-dapp.vercel.app](https://robinhood-chain-dapp.vercel.app/?ref=blog.arbitrum.foundation) and [github.com/hummusonrails/robinhood-chain-dapp-example](https://github.com/hummusonrails/robinhood-chain-dapp-example?ref=blog.arbitrum.foundation). ### Builder's Block #021: Robinhood Chain Mainnet Live on Arbitrum & Founder House London Winners URL: https://blog.arbitrum.foundation/builders-block-021-robinhood-chain-mainnet-live-on-arbitrum-founder-house-london-winners/ Last updated: 2026-07-16T12:57:52.000Z 💡 ****What's Important This Week** ⚙ Robinhood Chain Mainnet is Now Live on the Arbitrum Platform 💳 ZeroDev Launches a New Wallet 🇬🇧 Founder House London Concludes with $300K Awarded ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Robinhood Chain Mainnet is Live [![0626_Arbitrum_Robinhood_Mainnet_Blog_R4.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/0626_Arbitrum_Robinhood_Mainnet_Blog_R4-1.png)](https://blog.arbitrum.io/robinhood-chain-mainnet/?ref=blog.arbitrum.foundation) The launch of Robinhood Chain enables a more customized infrastructure designed to satisfy precise performance, security, and regulatory requirements. This environment establishes a robust foundation for the integration and development of decentralized financial primitives. [ Read the Story ](https://blog.arbitrum.io/robinhood-chain-mainnet/?ref=blog.arbitrum.foundation) ### Introducing ZeroDev Wallet 0:00 /0:56 1× ZeroDev Wallet is an embedded wallet built on ZeroDev’s programmable account infrastructure. It gives teams one stack for wallet creation, signing, smart account execution, gas sponsorship, session keys, policies, recovery options, and transaction orchestration. [ Try It Now ](https://www.zerodev.app/blogs/introducing-zerodev-wallet?ref=blog.arbitrum.foundation) ### Meet the Winners of Founder House London [![0726_OpenHouse_London_FounderHouse_Recap_Blog.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/0726_OpenHouse_London_FounderHouse_Recap_Blog.jpg)](https://x.com/arbitrum/status/2077728969030316338?s=20&ref=blog.arbitrum.foundation) From more than 490 registrations, 140 founders were selected to join Founder House London for three days of targeted sessions and iteration on product-market fit and go-to-market alongside mentors from across the Arbitrum ecosystem. By the end of the program, teams had submitted 64 projects competing for a share of $300,000 in prizes and grants. [ Meet the Winners ](https://x.com/arbitrum/status/2077728969030316338?s=20&ref=blog.arbitrum.foundation) --- ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### Predictable Fees for Onchain Agents [![predictable fees.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/predictable-fees.jpeg)](https://x.com/0xjesstech/status/2074444889119391775?s=20&ref=blog.arbitrum.foundation) As agentic commerce grows, predictable fees become increasingly important. This article breaks down why predictable fees matter for agentic commerce, how gas pricing works, and how Arbitrum’s dynamic pricing is evolving to support this next wave of onchain demand. [ Read the Article ](https://x.com/0xjesstech/status/2074444889119391775?s=20&ref=blog.arbitrum.foundation) ### Build Your First Robinhood Chain App [![robinhoodapp.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/robinhoodapp.jpeg)](https://x.com/hummusonrails/status/2075150298419490847?s=20&ref=blog.arbitrum.foundation) Want to get started in building on the Robinhood Chain? This article from [@hummusonrails](https://x.com/hummusonrails?ref=blog.arbitrum.foundation) features a full walkthrough from code design to final deployment of your first dApp on Robinhood! [ Read the Article ](https://x.com/hummusonrails/status/2075150298419490847?s=20&ref=blog.arbitrum.foundation) ### Arbitrum Supports x402 and MPP For Agentic Finance [![x402 support.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/x402-support.png)](https://blog.arbitrum.io/x402-and-mpp-for-agentic-finance-on-arbitrum/?ref=blog.arbitrum.foundation) Developers now have two new pathways for building agentic payment and settlement flows on Arbitrum. Arbitrum is supported by [Coinbase’s hosted x402 facilitator](https://docs.cdp.coinbase.com/x402/network-support?ref=blog.arbitrum.foundation), and Offchain has published [arbitrum-mpp](https://github.com/OffchainLabs/arbitrum-mpp?ref=blog.arbitrum.foundation), an open-source implementation for making payments over MPP on Arbitrum. [ Read the Article ](https://blog.arbitrum.io/x402-and-mpp-for-agentic-finance-on-arbitrum/?ref=blog.arbitrum.foundation) ### How Smart Accounts Give Onchain AI Agents Safe Permissions [![zerodev smart accounts.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/zerodev-smart-accounts.jpeg)](https://www.zerodev.app/blogs/how-smart-accounts-give-onchain-ai-agents-safe-permissions?ref=blog.arbitrum.foundation) Agents need the ability to act. They also need boundaries. Smart accounts make that possible by moving permissions, policy, and enforcement to the account layer. [ Learn More ](https://www.zerodev.app/blogs/how-smart-accounts-give-onchain-ai-agents-safe-permissions?ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### $800K in Revenue in the Last 7 Days [![revenue.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/revenue.jpeg)](https://tokenterminal.com/explorer/projects/robinhood/robinhoodchain/metrics?ref=blog.arbitrum.foundation) Robinhood Chain generated more than $800K in revenue in the last 7 days, annualizing to $42M at this rate. [ Check Out the Data ](https://tokenterminal.com/explorer/projects/robinhood/robinhoodchain/metrics?ref=blog.arbitrum.foundation) ### Introducing Swaps by Variational [![var swap.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/var-swap.jpeg)](https://x.com/variational%5Fio/status/2074126508000755983?s=20&ref=blog.arbitrum.foundation) Variational just launched Swaps, bringing Wall Street's widely used trading infra onchain with institutional liquidity for tokenized markets. A big step for [@variational\_io](https://x.com/variational%5Fio?ref=blog.arbitrum.foundation) toward bringing TradFi into the programmable economy. [ More Details ](https://x.com/variational%5Fio/status/2074126508000755983?s=20&ref=blog.arbitrum.foundation) ### Rialto Goes Live on Robinhood Chain [![railto.webp](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/railto.webp)](https://x.com/rialto%5Fxyz/status/2072696289695834345?s=20&ref=blog.arbitrum.foundation) We’re excited to welcome [@rialto\_xyz](https://x.com/rialto%5Fxyz?ref=blog.arbitrum.foundation), an onchain exchange for trading and borrowing against tokenized equities, crypto and real-world assets, launched on the Robinhood Chain. [ Learn More About Railto ](https://x.com/rialto%5Fxyz/status/2072696289695834345?s=20&ref=blog.arbitrum.foundation) ### **Prism is Live on Arbitrum** 0:00 /0:16 1× Arbitrum is building the finance-native platform for the programmable economy. Prism is where the pieces of Arbitrum’s financial stack start coming together. [ Learn More About Prism ](https://x.com/PrismFi%5F/status/2072683758302511510?s=20&ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### ZeroDev Wallet SDK [![5 account flows.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/5-account-flows.jpeg)](https://x.com/zerodev%5Fapp/status/2075481037405110358?s=20&ref=blog.arbitrum.foundation) What does a smart-account-first embedded wallet SDK actually unlock? ZeroDev breaks down [5 product flows to build with the ZeroDev Wallet SDK](https://x.com/zerodev%5Fapp/status/2075481037405110358?s=20&ref=blog.arbitrum.foundation). [ Start Building Today ](https://github.com/zerodevapp/zerodev-wallet-sdk?ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, builder and founder programs, and ecosystem meetups to watch.* ### Recap: Founder House London If you’re a founder who missed the ultimate in-person mentorship experience, here’s a look at what went down at Arbitrum Founder House London 🇬🇧 We've brought teams together under one roof for a 3-day founder residency where they: - Built new financial products across tokenized capital markets, collateral and risk infrastructure, payments, tokenized equity, agentic finance and yield bringing products onchain via Arbitrum One and the Robinhood Chain - Refined their product & GTM strategies - Received mentorship from our ecosystem partners - Competed for $300k in prizes Catch the highlights. đŸ‘‡đŸ» 0:00 /0:58 1× To keep up with upcoming builder programs, funding opportunities, and ecosystem updates, [subscribe to the Builder Newsletter](https://blog.arbitrum.foundation/). --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### \[Constitutional\] AIP: Ratification of Security Council Election Process Improvements In September 2025, the ArbitrumDAO showed varying degrees of support for five Security Council Election process improvements via a temperature check. This updated temperature check aims to ratify the DAO’s support for the inclusion of four and omission of one of the originally proposed improvements, ahead of an on-chain vote. [ More Details ](https://forum.arbitrum.foundation/t/constitutional-aip-arbos-61-elara/30601?ref=blog.arbitrum.foundation) ### ArbitrumDAO Factsheet: Robinhood Chain Mainnet Launch Robinhood Chain went live on public mainnet on 1 July 2026, a dedicated Arbitrum chain settling to Ethereum, after a testnet that processed more than 200 million transactions. [ Read the Full Factsheet ](https://forum.arbitrum.foundation/t/arbitrumdao-factsheet-robinhood-chain-mainnet-launch/31041?ref=blog.arbitrum.foundation) --- ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/Copy-of-New-Arbitrum-Everywhere-slide-template-1.png) ## Stay Ahead of What’s Next Subscribe to Builder’s Block for more updates, opportunities, and upcoming events from the Arbitrum ecosystem. Subscribe Email sent! Check your inbox to complete your signup. ### Top Founders Take Home $300K at London Founder House URL: https://blog.arbitrum.foundation/top-founders-take-home-300k-at-london-founder-house/ Last updated: 2026-07-15T15:32:04.000Z New financial primitives are coming to the Arbitrum Platform. From more than 490 registrations, 140 builders were selected to join Founder House London for three days of building alongside mentors from across the Arbitrum ecosystem. By the end of the program, teams had submitted 64 projects competing for a share of $300,000 in prizes and grants. Together, they built new financial products across tokenized capital markets, collateral and risk infrastructure, payments, tokenized equity, agentic finance and yield bringing products onchain via Arbitrum One and the Robinhood Chain. Now for the moment everyone's been waiting for... đŸ„ Drum roll, please. Here are the winners of the $300,000 Founder House London prizes and grants. ### **Meet the Strongest Teams We're Supporting** From 64 submitted projects, four teams stood out for the strength of their ideas, execution, and potential to shape the next generation of onchain finance. These projects represent some of the most compelling new financial primitives being built on the Arbitrum Platform. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/general-track-winners.png) **First prize of $60k -** [**Liquida**](https://x.com/xLiquida?ref=blog.arbitrum.foundation) Liquida is building a regulated collateral rail for the UK’s ÂŁ2.7 trillion government bond market. By tokenizing UK government bonds (gilts) into fully backed onchain assets, the platform enables institutions to use traditionally idle collateral as 24/7 programmable collateral for borrowing, lending, and liquidity management. **Second prize of $40k -** [**The Risk Protocol**](https://x.com/TheRiskProtocol?ref=blog.arbitrum.foundation) The Risk Protocol is building the missing risk layer for crypto markets. By enabling risk transfer onchain, the protocol aims to give institutions and users new tools to hedge volatility, manage exposure, and unlock deeper financial primitives across DeFi. **Third prize of $20k - split by** [**EdenFi**](https://x.com/edenfi%5Fonchain?ref=blog.arbitrum.foundation) **&** [**Obolos**](https://x.com/equitylayer?ref=blog.arbitrum.foundation) EdenFi and Obolos each showcased outstanding products and execution, making them joint recipients of third place. EdenFi is building a global money app for Africa and the diaspora, combining multicurrency accounts, cross-border payments, digital savings, and tokenized investments into one stablecoin-powered platform. Obolos is building programmable equity infrastructure for startups, enabling companies to issue shares, manage cap tables, and automate equity workflows with verifiable onchain ownership. In addition to the $120,000 awarded to the top three teams, the Arbitrum Foundation has committed a further $70,000 to support teams who continue making meaningful progress on the Arbitrum Platform after Founder House. ### **Robinhood Chain Awards** As part of Founder House London, Robinhood Chain recognized teams building financial products that reflect its vision for the future of finance. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/rhc-track-winners.png) **Robinhood Chain Founder-in-Residence at $60K:** [**Saffron**](https://x.com/saffron?ref=blog.arbitrum.foundation) Saffron is a fixed yield layer built on top of Uniswap concentrated liquidity pools, matching liquidity providers who want fixed yield with traders willing to buy future yield. Saffron is currently in pre-beta phase and is being tested with production smart contracts deployed on Ethereum mainnet, Arbitrum One, and Robinhood Chain. **Robinhood Chain Innovation Award at $30K:** [**Agama Finance**](http://x.com/agamafinance?ref=blog.arbitrum.foundation) Live on Robinhood Chain, Agama Finance is a RWA yield infrastructure that transforms tokenized stocks into productive, self-compounding, onchain assets. By enabling users to earn yield on tokenized equities through automated lending and yield strategies, Agama unlocks new utility for the next generation of tokenized markets. ### **Best Agentic Projects** As the infrastructure for agentic commerce falls into place, we recognize the following teams for building standout applications that demonstrate how autonomous agents can transact, compete, and operate onchain. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/agentic-winners.png) **First Prize at $10K:** [**AlphaGrid**](https://x.com/AlphaGridProp?ref=blog.arbitrum.foundation) AlphaGrid is a decentralized prop trading protocol where autonomous AI financial agents compete for capital under transparent onchain risk rules, while trading tokenized stocks on Robinhood Chain. **Second Prize at $6k:** [**CanHav Research**](https://www.canhav.io/?ref=blog.arbitrum.foundation) CanHav Research is building an agentic platform for navigating complex DeFi markets, combining ERC-8004 agent identities with Fully Homomorphic Encryption (FHE) to enable private, autonomous trading workflows. Users can deploy agents as research copilots or grant them execution capabilities while protecting proprietary strategies. **Third Prize at $4k:** [**ReineiraOS**](https://x.com/ReineiraOS?ref=blog.arbitrum.foundation) ReineiraOS is building the accountability layer for AI agents, enabling them to back their commitments with capital. If an agent breaches predefined limits, users receive compensation while the failure is recorded in the agent’s verified history. ### **Honorable Mentions** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/honorablementions.png) Several other teams also impressed our judges. We'd also like to recognize these teams for the innovative products they brought to Founder House London. - [Clearstone](https://x.com/ClearstoneHQ?ref=blog.arbitrum.foundation) - [Xeno Money](https://x.com/Xeno%5FMoney?ref=blog.arbitrum.foundation) - [Tortuga](https://x.com/tortuga%5Festate?ref=blog.arbitrum.foundation) - [Verus](https://x.com/tradeverus?ref=blog.arbitrum.foundation) - [Launchboard](https://launchboard.xyz/?ref=blog.arbitrum.foundation) ### **Inside Founder House London** 0:00 /0:58 1× A special thank you to the sponsors and ecosystem partners who helped make Founder House London possible: - Robinhood Chain - Offchain - Fhenix - Alchemy - Dune - GMX - OpenZeppelin - ZeroDev - AWS - Entropy Advisors - CFIT UK - Re7 Capital Their expertise and hands-on support were instrumental in helping participating founders sharpen their business models, refine their product direction, and develop stronger go-to-market strategies. ### **What’s Next** Founder House London is another step toward building the next generation of products powering the programmable economy. This is just the beginning. We’re excited to continue supporting teams building innovative financial products on the Arbitrum platform through Open House. To keep up with upcoming builder programs, funding opportunities, and ecosystem updates, subscribe to the Builder Newsletter. đŸ‘‡đŸ» [ Subscribe Now ](https://blog.arbitrum.foundation/) ### Arbitrum H1 2026: The programmable economy is accelerating URL: https://blog.arbitrum.foundation/arbitrum-h1-2026-the-programmable-economy-is-accelerating/ Last updated: 2026-07-15T17:08:43.000Z The first half of 2026 ended with a landmark milestone. On July 01, the **Robinhood Chain mainnet powered by Arbitrum went live,** crystallising what the ecosystem has been actively building: the finance-native platform with enterprise-grade infrastructure to power the programmable economy. As an Arbitrum chain, **Robinhood Chain remits 10% of its net revenue to the Arbitrum ecosystem.** This is the same revenue-sharing model that applies across 30+ Arbitrum chains (that settle outside Arbitrum One) as part of the licence economics of this product line. **Enterprise Growth** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/0626_Arbitrum_Robinhood_Mainnet_Blog_R4.png) Robinhood, a $100B fintech with 28 million users and $307B in AUM, has become the **world's largest publicly listed fintech** **with its own blockchain**, and it [chose the Arbitrum Platform to build it](https://blog.arbitrum.io/robinhood-chain-mainnet/?ref=blog.arbitrum.foundation). In just 2 weeks since its public launch, Robinhood Chain has already achieved: - Securing almost **$600M in TVS** - **$808M+ in 24h DEX volume** – 3rd-largest chain in crypto - **$800K+ in Revenue** (\~$23 million annualized run-rate) Alongside Robinhood, a broader wave of enterprise expansion took shape on Arbitrum in H1: - **LG Electronics** [announced](https://fortune.com/2026/06/11/lg-electronics-blockchain-arbitrum-ad-advertisements-platform/?ref=blog.arbitrum.foundation) it’s building out a blockchain-based network for its onchain advertising network on the Arbitrum Platform - **Mastercard**[expanded](https://blog.arbitrum.io/mastercard-stablecoin-settlement/?ref=blog.arbitrum.foundation) stablecoin settlement support to assets on Arbitrum - **PayPal's PYUSD** peaked at[ $428M](https://tokenterminal.com/explorer/projects/paypal/metrics/tvl?ref=blog.arbitrum.foundation) on Arbitrum in Q1 - **Cash App** [announced](https://x.com/CashApp/status/2059730955590684785?s=20&ref=blog.arbitrum.foundation) send and receive support in app for USDC with Arbitrum as a supported chain **Network activity** Underneath the enterprise momentum, the network continued to grow. - **Lifetime transactions** surpassed 2.7B while adding [474M](https://tokenterminal.com/explorer/projects/arbitrum/metrics/transaction-count?interval=180d&ref=blog.arbitrum.foundation) transactions in H1 alone. February 2026 accounts for an all-time-high of 133M - **Chain GDP** has surpassed [$1.7B](https://tokenterminal.com/explorer/projects/arbitrum/ecosystem/gdp?interval=max&ref=blog.arbitrum.foundation), growing 45% YoY - **Stablecoin holders** grew [40%](https://app.rwa.xyz/networks/arbitrum?ref=blog.arbitrum.foundation) to 10.5M, with monthly transfer volumes exceeding $60B **Market position** Arbitrum maintained and strengthened its position across key metrics in H1. - A **top-3 blockchain by protocol count**, with [1,142](https://defillama.com/chains?ref=blog.arbitrum.foundation) live projects on the Arbitrum Platform - **RWA AUM** at \~[$850M](https://app.rwa.xyz/networks/arbitrum?ref=blog.arbitrum.foundation) (3x YoY) and consistently leading by deployment count with 2,000+ assets - **Derivatives broke out in H1**: open interest grew [434%](https://defillama.com/perps/chain/arbitrum?ref=blog.arbitrum.foundation) in six months, peaking at $1.5B and exceeding the combined open interests on Ethereum and Solana **Financial resilience** ArbitrumDAO continued to operate with structural efficiency through H1 despite market volatility. - ArbitrumDAO maintained[ 97%+](https://dune.com/entropy%5Fadvisors/arbitrum-dao-financials?ref=blog.arbitrum.foundation) **gross margins** across protocol revenue streams throughout H1 - Held [$125M+](https://dune.com/entropy%5Fadvisors/arbitrum-dao-treasury?ref=blog.arbitrum.foundation) in **non-native treasury assets** (ETH, RWAs & stablecoins) as of June-end **Product readiness** The Arbitrum technology stack continued to outpace adoption throughout H1. - [Dynamic pricing](https://blog.arbitrum.io/dynamic-pricing-update-2026/?ref=blog.arbitrum.foundation) went live on Arbitrum One, giving businesses predictable transaction costs at scale. - Compliance tooling, ZK-proof settlement, confidentiality infrastructure, and new economic levers for dedicated chains are actively in development. The full architecture is laid out[ here](https://blog.arbitrum.io/architecture-of-the-programmable-economy/?ref=blog.arbitrum.foundation) for anyone evaluating what the platform looks like at the next stage of scale. The Robinhood announcement is the headline. But the six months that preceded it are the reason it happened here and not somewhere else. ### Builder's Block #020: Final Call for Founder House London & Why Enterprises Choose Arbitrum URL: https://blog.arbitrum.foundation/builders-block-020-final-call-for-founder-house-london-why-enterprises-choose-arbitrum/ Last updated: 2026-07-16T09:16:16.000Z 💡 ****What's Important This Week** ****🇬🇧** Last Chance to Apply for Founder House London - Here’s What to Expect 💾 The winners that took home $85k at Open House London Buildathon ⚙ A closer look at ArbOS 61 Elara ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Last Chance to Apply for Founder House London ![0426_OpenHouse_London_LastDayToApply_V2.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/0426_OpenHouse_London_LastDayToApply_V2.jpg) Founder House starts next week from July 10-12\. Selected teams will spend 3 days, in-person, to accelerate product development, refine their go-to-market strategy, and launch into the programmable economy. [ Apply Now ](https://luma.com/openhouse-london?utm%5Fcampaign=oh-london-founder-house&utm%5Fmedium=newsletter&utm%5Fsource=builder-block) Read more on what to expect during the 3-day program [here](https://x.com/arbitrum/status/2067258498954432662?s=20&ref=blog.arbitrum.foundation) ### Meet the Winners of Open House London Buildathon ![winner.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/winner.jpeg) Over the past 3 weeks, the Open House London Buildathon brought together 782 builders and 278 project submissions across DeFi, AI, RWAs, payments, privacy, and more. âžĄïž [Meet the winners of the $85K prize pool](https://x.com/arbitrum/status/2069113415348744568?ref=blog.arbitrum.foundation) ### The Peanut Card is Out ![Screenshot 2026-06-30 at 1.05.25 PM.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/Screenshot-2026-06-30-at-1.05.25---PM.png) The brand new physical payment card from @joinpeanut is available now - a card accepted at over 150 million Visa-accepting merchants. We're letting beta users in slowly; ArbiVerse badge holders can skip the waitlist entirely. âžĄïž [Not a badge holder? Join the waitlist](https://peanut.me/shhhhh?ref=blog.arbitrum.foundation) --- ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### Arbitrum Stylus on Denaria ![danaria.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/danaria.jpeg) Denaria is building a fully onchain perpetuals trading engine. As part of its development on the Arbitrum Platform, Denaria has started implementing Arbitrum Stylus inside its trading engine to make execution more efficient and cheaper for users. âžĄïž [Read more on how they are using Arbtrum Stylus](https://x.com/DenariaFinance/status/2067268194394391039?ref=blog.arbitrum.foundation) ### WakeUp Labs: Building Production Applications with Arbitrum Stylus ![wakeuplabs.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/wakeuplabs.jpeg) As part of the Arbitrum ecosystem, WakeUp Labs are building a series of open-source production applications designed to validate Stylus through real-world implementations. This first milestone focuses on one of the most demanding application types in DeFi: DEX Aggregator. âžĄïž [Read the full technical write-up](https://www.wup.ar/en/blog/building-production-applications-arbitrum-stylus-part-1-dex-aggregation?ref=blog.arbitrum.foundation) ### An Intro to Agentic Commerce ![intro to agentic commerce.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/intro-to-agentic-commerce.jpeg) Payments are one important part, but business relationships need rules of engagement: how to discover each other, agree on terms, handle disputes, settle payments, etc. This article covers about the evolution of online commerce and why Agentic Commerce will be relevant for your project. âžĄïž [Read the full article](https://x.com/blockbyvlog/status/2069711922211991652?s=20&ref=blog.arbitrum.foundation) ### The Enterprise Blockchain Infrastructure Stack ![blockchain stack.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/blockchain-stack.jpeg) The programmable infrastructure conversation is shifting from experimentation to production implementation. Financial institutions, global brands, infrastructure providers, and technology teams are looking at blockchain systems not as pilots, but as production environments that can support new markets, revenue streams, and customer experiences. âžĄïž [Read how Offchain is delivering the right enterprise infrastructure stack to help institutions](https://www.offchain.io/blog/products/the-enterprise-blockchain-infrastructure-stack-is-coming-into-focus?ref=blog.arbitrum.foundation) ### ETH Cluj 2026: How To Build on Arbitrum ![ethcluj.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/ethcluj.png) The ETHCluj team this year hosted a full day of Arbitrum workshops as part of their dedicated Educational Track. The workshops were designed around onboarding the next wave of builders into the ecosystem and offer them a chance to learn, whether they were already familiar with blockchain technology or not. To support continued learning, they've put together open-source materials based on the workshops. âžĄïž [Explore the workshop materials](https://stylus-developers-guild.github.io/ethcluj-2026/index.html?ref=blog.arbitrum.foundation) ### How Arbitrum Adapts to AI Surge Onchain AI agents have exploded to over 250,000 daily active instances - a 400% jump in just one year. As these autonomous agents flood blockchains with transactions, networks must evolve fast to avoid congestion and high fees. Check out the full breakdown and how Arbitrum is tackling this head-on with Dynamic Pricing. > There are over 250,000 daily active onchain AI agents. That’s an increase of 400%+ in the last year. > > With transaction volumes increasing, blockchains need to adaptđŸ§”đŸ‘‡ [pic.twitter.com/1JEXez4M6G](https://t.co/1JEXez4M6G?ref=blog.arbitrum.foundation) > > — Jess (@0xjesstech) [June 25, 2026](https://x.com/0xjesstech/status/2070097530033979410?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### $345M in tokenized non-U.S. government debt ![tokenized non us debt.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/tokenized-non-us-debt.jpeg) Arbitrum just reached $345M in tokenized non-U.S. government debt. Institutions are bringing financial products onchain to access global liquidity, reach new markets and settle transactions instantly. âžĄïž [Check out the data](https://app.rwa.xyz/government-bonds?ref=blog.arbitrum.foundation) ### $300 Million Private Volume on Arbitrum ![300.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/300.jpeg) Over $300 million of tokens have been privatized using RAILGUN infrastructure on Arbitrum. Every transaction strengthens privacy on Arb. âžĄïž [Check out the announcement](https://x.com/RAILGUN%5FProject/status/2069427686489854271?s=20&ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### Founder House London starts next week on July 10th ![encode.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/encode.jpeg) We’re excited to host the Arbitrum Founder House at Encode Hub in London, a 3 day in-person event for early stage founders & teams building their ventures on Arbitrum. âžĄïž [Last chance to apply here](https://luma.com/openhouse-london?utm%5Fcampaign=oh-london-founder-house&utm%5Fmedium=newsletter&utm%5Fsource=builder-block) ### UXmaxx Hackathon: Pushing Crypto Towards Its Current Potential ![uxmaxx.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/07/uxmaxx.jpeg) The UXMaxx Hackathon has officially kicked off. Alongside @ParticleNtwrk, Arbitrum is backing builders at the UXmaxx Hackathon to create apps where infrastructure disappears and the experience comes first. Because the tech is there - now it just needs the UX! âžĄïž [It’s not too late to sign up now](https://www.encodeclub.com/programmes/uxmaxx-hackathon?ref=blog.arbitrum.foundation) ### Berlin Blockchain Week Recap: DFC Pitch Competition As part of Arbitrum Founder's Eve, Arbitrum and the DeFi Founders Club hosted a startup pitching competition for teams building the future of Web3\. 10 selected teams took the stage for a sharp 2-minute pitch followed by 2 minutes of Q&A in front of investors, founders, builders, and ecosystem leaders. Check out the recap 👇 > Still buzzing from the DFC Pitch Competition in Berlin đŸ‡©đŸ‡Ș > > 10 startups. One stage. A room full of investors, founders, and DeFi operators. > > Here's what it looked like 👇 [pic.twitter.com/JKoHY3nipa](https://t.co/JKoHY3nipa?ref=blog.arbitrum.foundation) > > — DeFi Founders Club (@DeFiFounders) [June 26, 2026](https://x.com/DeFiFounders/status/2070505774833406167?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) Here's one story from Berlin Blockchain Week that perfectly captures it: > The best builder events do not end with applause. > > They end with somebody opening a laptop, and taking the next step. > > Applications close soon for the best builder event in London, [@Arbitrum](https://x.com/arbitrum?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) Open House. > > One amazing story below from [@BerBlockWeek](https://x.com/BerBlockWeek?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) 👇 đŸ§”[https://t.co/I6EenHSPev](https://t.co/I6EenHSPev?ref=blog.arbitrum.foundation) [pic.twitter.com/RMXXzBgw9z](https://t.co/RMXXzBgw9z?ref=blog.arbitrum.foundation) > > — Ben Greenberg (@hummusonrails) [June 26, 2026](https://x.com/hummusonrails/status/2070417627487654320?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### \[Constitutional\] AIP: ArbOS 61 Elara Update as of June 19, 2026: Offchain Labs would like to make 2 important updates to this proposal, alongside the in-line edits to reflect these updates which include Minor version bump from ArbOS 60 to ArbOS 61 and reaffirming their decision to not activate Dynamic Pricing as part of this proposal. âžĄïž [Read the full proposal](https://forum.arbitrum.foundation/t/constitutional-aip-arbos-61-elara/30601?ref=blog.arbitrum.foundation) ### ArbitrumDAO Factsheet: LG Electronics Pilots Onchain Advertising on Arbitrum LG Electronics’ Blockchain Research Lab is piloting an onchain advertising network on Arbitrum, targeting three structural problems in digital advertising: fake traffic sometimes counted as genuine performance; privacy rules and platform changes that complicate targeting and measurement; advertising volume rising while user engagement falls. âžĄïž [Read the full factsheet](https://forum.arbitrum.foundation/t/arbitrumdao-factsheet-lg-electronics-pilots-onchain-advertising-on-arbitrum/30988?ref=blog.arbitrum.foundation) ### \[Constitutional\] AIP Fast Feed This Constitutional AIP proposes to establish the Fast Feed, a paid, authenticated data streaming product for Arbitrum One. The Fast Feed allows subscribers to get updates on transactions, their relative ordering, and related transaction metadata earlier than they would otherwise via the regular feed. The Fast Feed makes that stream accessible to Arbitrum’s ecosystem as a specialized, subscription-based data product. âžĄïž [Read the full proposal](https://forum.arbitrum.foundation/t/constitutional-aip-fast-feed/31003?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #020\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Builder's Block #019: Arbitrum's Product Priorities & Meet the Sponsors Backing London Founder House URL: https://blog.arbitrum.foundation/builders-block-019-arbitrums-product-priorities-meet-the-sponsors-backing-london-founder-house/ Last updated: 2026-06-18T14:02:04.000Z 💡 ****What's Important This Week** đŸ€– LG Electronics is piloting an onchain advertising network on Arbitrum 💾 Meet the full sponsor lineup for Open House London ⚙ Understand how the Arbitrum Nova transition will work ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### LG Electronics Pilots Onchain Advertising Network on Arbitrum ![0626_Arbitrum_PartnershipAnnouncement_LGElectronics_Blog_V1.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/0626_Arbitrum_PartnershipAnnouncement_LGElectronics_Blog_V1.png) LG Electronics is piloting an on-chain advertising network on Arbitrum. Developed by the company’s Blockchain Research Lab, the project explores whether advertising performance can be recorded in a transparent, verifiable format that all stakeholders can independently review. âžĄïž [Read more here](https://blog.arbitrum.io/lg-electronics-pilot/?ref=blog.arbitrum.foundation) ### Meet the Sponsors of Open House London ![0626_OpenHouse_London_Sponosors_Blog.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/0626_OpenHouse_London_Sponosors_Blog.jpg) Open House London is made possible by an incredible group of industry-leading teams committed to support the next generation of businesses launch in the programmable economy. [Apply now](https://luma.com/openhouse-london?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-london-founder-house) âžĄïž [Check out the full lineup of sponsors](https://x.com/arbitrum/status/2065403028673581564?s=20&ref=blog.arbitrum.foundation) --- ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### The agent economy has a verification problem ![0526_Arbitrum_Blog_AgentEconomy.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/0526_Arbitrum_Blog_AgentEconomy.jpg) When you call a model API, you trust the provider to run the model they promised, but there's no way to verify it. This article from our DevRel [@hummusonrails](https://x.com/hummusonrails?ref=blog.arbitrum.foundation) breaks down a paper from Offchain on verifiable AI inference, and how it could bring proof generation from minutes to milliseconds. âžĄïž [Read more here](https://blog.arbitrum.foundation/the-agent-economy-has-a-verification-problem/) ### X402 and Agentic Commerce with Arbitrum & AWS ![etol6mxM.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/etol6mxM.jpeg) Join [@hummusonrails](https://x.com/hummusonrails?ref=blog.arbitrum.foundation) from Arbitrum Foundation & [@maishsk](https://x.com/maishsk?ref=blog.arbitrum.foundation) from @awscloud for a live walkthrough and demo of x402 agentic payments built on AWS AgentCore and Arbitrum's settlement layer. Perfect for devs building agentic applications for the upcoming Arbitrum London Founder House. âžĄïž [Sign up now](https://luma.com/x402-aws-arbitrum?ref=blog.arbitrum.foundation) ### How Founder House Supports Early-Stage Teams Early stage teams need the right environment to scale their businesses in the programmable economy. Arbitrum Founder House is coming to London on July 10-12, a 3-day program to help founders refine their product direction & GTM strategies with up to $300k in prizes and grants. Watch this video to learn what Founder House London is all about đŸ‘‡đŸ» > The programmable economy is creating entirely new businesses and founders are leading the way. > > That's why we launched Founder House - help early-stage teams like [@bondoncredit](https://x.com/bondoncredit?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) accelerate their product and go-to-market on the Arbitrum Platform. > > Join us in London on July 10-12\. [pic.twitter.com/PTR6p11ns7](https://t.co/PTR6p11ns7?ref=blog.arbitrum.foundation) > > — Arbitrum (@arbitrum) [June 9, 2026](https://x.com/arbitrum/status/2064373421908045932?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### Arbitrum: The Architecture of the Programmable Economy ![Architecture-of-Programmable-Economy.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/Architecture-of-Programmable-Economy.png) Global markets still rely on fragmented systems where payments pause at borders and innovation moves slowly. Arbitrum is now evolving from a scaling solution to the finance-native platform powering the programmable economy. In this article, we explore the architecture being developed to support this future, from predictable costs and protocol-level compliance to configurable privacy and faster settlement. âžĄïž [Read more here](https://blog.arbitrum.io/architecture-of-the-programmable-economy/?ref=blog.arbitrum.foundation) ### Mastercard Taps Arbitrum For Global Stablecoin Settlement ![IMG_1428.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/IMG_1428.png) Mastercard has announced a major expansion of its global settlement capabilities, choosing Arbitrum as one of the networks to support its new onchain infrastructure. As payment flows shift toward an internet-native paradigm, Mastercard is making 24/7 financial operations a reality by introducing intraday, weekend, and holiday settlement options. âžĄïž [Read more here](https://blog.arbitrum.io/mastercard-stablecoin-settlement/?ref=blog.arbitrum.foundation) ### Arbitrum Ranked in Fortune Crypto 100 ![HKjEreKWkAEc_RW.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/HKjEreKWkAEc_RW.jpeg) Arbitrum has been named to the inaugural @FortuneMagazine Crypto 100, a definitive ranking of the most influential companies in blockchain. Together with our ecosystem, we're building the finance-native platform powering the programmable economy for builders, enterprises and institutions. âžĄïž [Read more here](https://fortune.com/ranking/crypto/?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### PayAI - The largest x402 facilitator now supports Arbitrum ![HKDhl4LagAEKZhW.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/HKDhl4LagAEKZhW.jpeg) PayAI, the largest x402 facilitator on Solana and a top facilitator across the broader x402 ecosystem, expands its multichain support to Arbitrum One, allowing faster settlements, lower fees, & more reach. Any agent, app, or API integrated with PayAI can now accept and pay for resources on Arbitrum using the same x402 flow. âžĄïž [Read more here](https://blog.payai.network/x402-on-arbitrum-payai-adds-support-for-arbitrum-one/?ref=blog.arbitrum.foundation#what-this-unlocks) ### ArbOS 40 Compatibility Notice: Upgrade to Nitro v3.10 + Consensus v51 ![Ou4RSIXh.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/Ou4RSIXh.jpeg) We recommend that all chains upgrade to Nitro v3.10+ and its WASM module root to Consensus v51+. These releases include the latest hardening, improvements, and maintains backward compatibility with previous ArbOS releases. âžĄïž [Read about the upgrade here](https://x.com/ArbitrumDevs/status/2064112881143103494?s=20&ref=blog.arbitrum.foundation) ### Enable Gasless Payments and Wallets for AI Agents with Q402 ![q402.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/q402.png) Q402 is now live on Arbitrum. Through a single MCP integration, developers can plug it into Claude, Cursor, Cline, Codex, or any MCP client, and the agent gets equipped with gasless payments, recurring payments, & Agentic Wallets out of the box. âžĄïž [Try it here](https://q402.quackai.ai/?ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### Founder House London is bringing early-stage teams together with a $300K prize pool ![0426_OpenHouse_London_Prizes&Grants_FounderHouse_R2.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/0426_OpenHouse_London_Prizes-Grants_FounderHouse_R2.jpg) Starting July 10th, teams will join a 3-day, in-person founder program to receive technical, product, and GTM guidance through workshops, showcase their products during demo sessions + compete for prizes, and bring businesses onchain to Arbitrum and the RobinhoodApp Chain. âžĄïž [Apply here](https://luma.com/openhouse-london?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-london-founder-house) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### Minimizing Arbitrum Nova As per a recent proposal, the ArbitrumDAO has voted to minimize Arbitrum Nova by transitioning it into a maintenance-oriented state with reduced capacity and deprioritized support. âžĄïž [Read the full details](https://forum.arbitrum.foundation/t/minimizing-arbitrum-nova-faqs/30955?ref=blog.arbitrum.foundation) ### Arbitrum Audit Program: Transparency Report #3 The DAO-approved Arbitrum Audit Program (AAP) completed its third operational quarter during the period from February 01, 2026, to April 30, 2026 (“Q3”). 108 applications received during Q3, with DeFi remaining the most prominent category. Across 14 completed audits, 297 vulnerabilities were identified (including 8 classified as critical and 31 as high), and 21,882 lines of code were reviewed. âžĄïž [Read the full details](https://forum.arbitrum.foundation/t/arbitrum-audit-program-transparency-report-3/30976?ref=blog.arbitrum.foundation) ### \[Constitutional\] AIP: Transition Arbitrum One ordering policy to Priority Gas Auctions (PGA) This Constitutional AIP proposes to disable Timeboost on Arbitrum One and replace it with a Priority Gas Auction (PGA) mechanism, an ordering policy that’s more familiar for actors who are willing to pay for transaction priority, allowing more market participants to be a part of Arbitrum’s next phase of growth. In addition, it would sunset Timeboost on Arbitrum Nova. âžĄïž [Read the full details](https://forum.arbitrum.foundation/t/stylus-trace-studio-final-report/30981?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #019\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Arbitrum Founder House London: Apply Now to Launch Businesses Powering the Programmable Economy URL: https://blog.arbitrum.foundation/arbitrum-founder-house-london-apply-now-to-launch-businesses-powering-the-programmable-economy/ Last updated: 2026-06-04T15:31:49.000Z Applications are now open for Founder House London, the next phase of Arbitrum's Open House global founder program. Founder House is a three-day, in-person program in London for founders building serious onchain businesses on the Arbitrum Platform. [Apply Now To Founder House London](https://luma.com/openhouse-london?utm%5Fcampaign=oh-london-founder-house&utm%5Fmedium=blog&utm%5Fsource=arbitrum-blog) Running from **July 10–12, 2026**, selected teams will receive: - Opportunity to compete for $300K in prizes and grants - Mentorship from Robinhood Chain, AWS Cloud, Offchain, Arbitrum Foundation and industry leaders - Hands-on workshops covering the tools and infrastructure needed to launch and grow products onchain - Technical, product, go-to-market support Founder House is designed for founders building the next generation of payments, tokenization, AI, DeFi, and privacy businesses in the programmable economy. ## **Why We're Supporting the next-gen of onchain businesses** The programmable economy is emerging. Finance, payments, AI, privacy, and digital markets are becoming programmable as transactions, business processes, and financial products increasingly run on software. As institutions and enterprises move onchain, a new generation of founders is building the businesses that will power this shift. To support those founders, we launched Open House in May with a three-week online Buildathon designed to help early-stage teams accelerate product development, strengthen their technical foundations, connect with industry leaders, and win $115K in prizes. Founder House is the next phase of that journey. From July 10–12, selected teams + Buildathon winners will come together in London to receive direct mentorship from Robinhood Chain, AWS Cloud, Offchain, Arbitrum Foundation and industry leaders, refine their products and go-to-market strategies and compete for $300K in prizes and grants. Our goal is simple: help founders turn ambitious ideas into successful businesses shaping the programmable economy. ## **Who Should Apply?** Founder House is intended for teams that already have a product, prototype, or clear business concept and are looking to accelerate development, refine go-to-market strategy, and prepare for going mainnet on the Arbitrum Platform. We encourage applications from teams building across areas such as: ### **Stablecoins & Payments** - Remittance applications - Merchant checkout systems - Payroll infrastructure - Payments applications ### **Tokenization & Real-World Assets** - Tokenized yield products - RWA-backed lending platforms - Treasury and credit markets - Commodity exposure products ### **DeFi & Financial Infrastructure** - AI-powered portfolio management - Structured yield strategies - Intent-based DeFi systems - Cross-protocol credit systems ### **AI & Agentic Finance** - Automated DeFi strategies - Agent-powered treasury systems - Autonomous payment systems - Machine-to-machine commerce applications ### **Privacy** - Private payments - Encrypted trading systems - Privacy-enabled financial products ### **Consumer Applications** - Prediction market products - Social finance applications - Creator monetization platforms ### **Bonus Areas** We're especially excited to see teams building: - Rust, C, or C++ applications using Arbitrum Stylus - Trading systems leveraging Timeboost - WASM-native financial tooling - Crosschain liquidity infrastructure and applications ## **What Founders Can Expect** ### **Day 1: Product & Technical Foundations** Teams will participate in hands-on workshops and fireside chats covering the infrastructure, tooling, and resources available across the Arbitrum ecosystem. Founders will receive direct feedback from Robinhood Chain, AWS Cloud, Offchain, Arbitrum Foundation and industry leaders to help strengthen their product strategy, technical architecture, and execution plans. ### **Day 2: Growth, Distribution & Ecosystem Access** The second day focuses on turning products into businesses. Teams will participate in sessions covering product-market fit, go-to-market strategy, distribution, growth and ecosystem alignment. ### **Day 3: Demo Sessions with $300K in prizes and grants** Selected winners will get the opportunity to pitch their business to the Arbitrum Foundation and Offchain team, as well as our industry-leading sponsors such as Robinhood Chain and AWS. Winning teams will also receive an invitation to join Arbitrum’s 8-week Mentorship Program, providing continued support as they scale their products and businesses in the programmable economy. ## **$300K in Prizes & Grants** Founder House London will award $300,000 in milestone-based prizes and grants across multiple tracks designed to support founders building the next generation of businesses on the Arbitrum Platform. ### **General Category - $120K** The top three teams at Founder House London will receive: - 1st Place - $60K USDC - 2nd Place - $40K USDC - 3rd Place - $20K USDC At least one of the top three winners will be selected from projects building on the Robinhood Chain. ### **Robinhood Chain Founder-in-Residence - $60K** A dedicated award for an outstanding team building exclusively on the Robinhood Chain. ### **Robinhood Chain Innovation Award - $30K** Awarded to a project demonstrating exceptional innovation on the Robinhood Chain. ### **Best Agentic Project - $20K** Reserved for projects building AI-powered and agentic applications on Arbitrum and Robinhood Chain. The top three teams in this category will share $20K in prizes, with at least one winning project building on the Robinhood Chain. ### **Additional Grants - $70K** The Arbitrum Foundation has reserved an additional $70K in grants for selected teams demonstrating strong potential and ecosystem alignment. ### **Milestone-Based Funding** For most tracks, a portion of the prize funding will be distributed upfront, with the remainder tied to development milestones designed to support continued execution after Founder House concludes. ## **Sponsors** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/06/data-src-image-135640a5-38d6-483b-8b43-5aab1c534e3c.png) Open House London would not be possible without the support of our ecosystem partners, who are helping founders build, launch and scale the next generation of businesses onchain. - Robinhood Chain - AWS - Fhenix - ZeroDev - Alchemy - OpenZeppelin - GMX - Dune Analytics - CFIT UK (Centre for Finance, Innovation & Technology) ## **Apply Now** Applications for Founder House London are open. Join us in London from July 10-12 and build alongside founders shaping the next generation of businesses in the programmable economy. Applications close on June 25, 2026\. Entry to the event is subject to T&Cs on the registration page. Let’s shape the programmable economy together. [Apply Now!](https://luma.com/openhouse-london?utm%5Fcampaign=oh-london-founder-house&utm%5Fmedium=blog&utm%5Fsource=arbitrum-blog) ### The agent economy has a verification problem URL: https://blog.arbitrum.foundation/the-agent-economy-has-a-verification-problem/ Last updated: 2026-06-03T08:05:36.000Z When you call a model API, you trust the provider to run the model you asked for. Not a quantized variant. Not a cheaper substitute routed in when load spikes. You can check tokens. You can diff outputs. What you cannot do is verify that the bytes flowing through the GPU were the bytes of the model you were promised. A March 2026 paper from Offchain Labs, [Towards Verifiable AI with Lightweight Cryptographic Proofs of Inference](https://arxiv.org/abs/2603.19025?ref=blog.arbitrum.foundation), gives a concrete answer for the inference piece of that question, collapsing proof generation from roughly 15 minutes per query down to milliseconds. The direction of the answer should feel familiar to anyone who has thought about how Arbitrum works. ## The trust gap we've already accepted Per-token pricing creates an economic incentive to cheat. Serving a 7B parameter model is cheaper than serving a 70B one. Quantized inference is cheaper than full precision. If a provider can route some fraction of requests to a smaller or cheaper model and bill at the headline rate, the savings compound at scale. This is not hypothetical. Stanford researchers showed that the [behavior of GPT-3.5 and GPT-4 shifted measurably between March and June 2023](https://venturebeat.com/ai/not-just-in-your-head-chatgpts-behavior-is-changing-say-ai-researchers/?ref=blog.arbitrum.foundation) on the same evaluation tasks, and a follow-on line of work has [formalized the problem of detecting outright model substitution in LLM APIs](https://arxiv.org/abs/2504.04715?ref=blog.arbitrum.foundation). None of this is an accusation against any specific provider. The point is that today's API contract gives you no mechanism to know either way. For an individual developer that is a nuisance. For regulated industries, model governance teams, and the emerging agent-to-agent settlement layer, it is a load-bearing gap. ## Why the cryptographic answer does not work yet There is already a class of cryptographic proofs that can show a server ran a specific computation correctly without the client having to re-run it. The same family of tools used by zk-rollups. Attach a proof to the response, the client verifies it in a fraction of the original work. So the obvious move is to do the same thing for AI inference. The math works. The numbers do not. State-of-the-art schemes like [zkLLM](https://arxiv.org/abs/2404.16109?ref=blog.arbitrum.foundation) produce a proof of inference for a 13B parameter LLM in around 15 minutes. For a smaller model like Llama-2-7B, the published numbers are 388 seconds of proving time per query, with a 183 kB proof and a 2.36 second verification. That is fine for a research demo. It is not fine for an API expected to respond in under a second. Inference is fast and customers expect it to stay fast, so the proof has to be comparably fast or it becomes the bottleneck. ## The bet: spot-check instead of re-prove The Offchain Labs paper takes a different route. Instead of cryptographically proving every multiply-and-add inside the neural network, the server commits to two things up front: 1\. A fingerprint of the model weights, published once after training. 2\. A fingerprint of the internal values the model produced while answering a specific query. Then the client picks a random spot near the network's output and walks one path back through the layers, asking the server to reveal just the values along that path. At each step, the client checks one thing. Does this value actually follow from the values feeding into it, using the weights it committed to publicly? If the server swapped in a different model, the values along the path will not line up, and the check fails. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/verify_one_path_not_whole_model.png) Different models can't fake the same internal values everywhere It is closer to spot-checking a math exam than re-grading it. A single path samples a tiny fraction of the network, but faking values that stay self-consistent across many possible paths gets exponentially harder as the network grows. The authors tested this against the attacks an adversary would actually try, including reverse-engineering the activations from the output and swapping likely tokens. None produced a forged set of values that fooled the test across millions of evaluated paths. The intuition behind why this works comes from machine learning research, not cryptography. Two networks that produce noticeably different outputs on the same input have to differ in their internal computation somewhere. You do not need to re-execute the whole model to catch a cheater. You need to catch them in one consistent lie. ## From minutes to milliseconds The performance difference between proving every step and spot-checking a path is not a few percent. It is several orders of magnitude. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/speed_chart.png) The cost of switching from full proof to spot-check Both numbers are on the same model, Llama-2-7B. The tradeoff is honest. The proof is larger, and the client no longer gets cryptographic certainty per query. What it gets is a tunable detection probability that compounds across repeated queries, which combined with a real penalty for being caught is enough to deter rational adversaries. An API serving millions of inferences a day does not need a per-query proof that holds up against an attacker willing to brute force a single transcript. It needs verification that runs at the speed of the request and detects cheating with high probability across volume. That is the shape the new protocol fits. ## Why this story belongs on Arbitrum Sub-second verification of an outsourced computation is the question Arbitrum was initially built around. Optimistic rollups rest on the same intuition the paper formalizes for AI. Re-executing every step of a long computation on every machine is expensive. Sampling the contested step is cheap. If the system can guarantee that any disagreement gets surfaced and resolved by a tiny onchain check, you get the security of full re-execution without paying for it on the happy path. The paper makes the connection explicit. Its protocol can extend to a setup with two competing servers, and when they produce different claims about the same inference, a bisection procedure narrows in on the disagreement in a logarithmic number of rounds. That is the same [dispute resolution structure that secures Arbitrum One](https://docs.arbitrum.io/how-arbitrum-works/bold/gentle-introduction?ref=blog.arbitrum.foundation), applied to neural network values instead of blockchain state transitions. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/figure2-interaction-flow-1.jpeg) Figure 2 from the paper: the prover commits to the trace, the verifier samples a path, and the prover opens just the values along it, which is the same commit, challenge, reveal shape that secures optimistic rollups. The takeaway is not that AI inference needs a blockchain. It is that the verification problem in the agent economy has the same shape as the verification problem Arbitrum already solved. Spot-check rather than re-execute. Trust the willingness to be challenged rather than the cryptographic load on the happy path. Arbitrum has been operating in that paradigm for years. ## What this means if you build with AI APIs Settlement is converging on commodity rails. USDC, [x402](https://x.com/arbitrum/status/2054914593722687728?ref=blog.arbitrum.foundation), agent-native payment flows are infrastructure questions now, not differentiation questions, and the more interesting layer is what the agent can prove it did, not how it paid. Today, "we use model X" is a trust statement. A protocol like this one turns it into a verifiable statement. For customers in compliance-heavy domains, the distinction starts to matter quickly. A model transparency claim that holds up under audit is worth more than a marketing claim that does not. The pattern also generalizes. Anywhere you outsource a deterministic computation to an untrusted service, spot-checking is a viable alternative to re-executing. Inference today, other workloads tomorrow. Audit flows benefit too, since a regulator who needs to verify that a certified model is the one actually running in production does not have to ban remote APIs to do the job. They can ask for a commitment, send queries, and check. None of this requires that you, the application developer, refactor your existing stack. It does require that someone in the system, the provider, the auditor, or the platform routing requests, produces a verifiable claim instead of an asserted one. Once that primitive exists at speed, it gets adopted in the places where the trust gap is most expensive. ## Where this is going The agent economy has mostly been told as a money-movement story, and moving money is perhaps the part with the most familiar primitives. The verification layer is less well-formed, and that is exactly why this research is so interesting right now. The Offchain paper does not solve the integrity problem entirely. It offers a way forward for the inference piece against a meaningful threat model, in milliseconds. That is worth paying attention to, and a useful indicator of where the future of verifiable AI inference is going. [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/HITWDnNbgAASKJE.png)](https://luma.com/openhouse-london?utm%5Fcampaign=oh-london-founder-house&utm%5Fcontent=verifiable-ai-post&utm%5Fmedium=blog&utm%5Fsource=blog) The signature builder program, [Open House](https://luma.com/openhouse-london?utm%5Fcampaign=oh-london-founder-house&utm%5Fcontent=verifiable-ai-post&utm%5Fmedium=blog&utm%5Fsource=blog), is coming to London in July for an in-person Founder House, with agentic AI as one of the focus areas. Do you have an idea related to how to tackle trust in AI or any topic related to this emerging space? If you want to bring your idea to life with the support of leading ecosystem mentors and the chance to win grants and prizes totaling in the hundreds of thousands of dollars, apply to join today. ### Builder's Block #018: What's Next for AI & Open House Buildathon Schedule URL: https://blog.arbitrum.foundation/builders-block-018-whats-next-for-ai-open-house-buildathon-schedule/ Last updated: 2026-06-02T12:00:11.000Z 💡 ****What's Important This Week** 📋 Schedule and FAQs about the Open House Online Buildathon đŸ› ïž Sub-second proof verification with Syndicate and Stylus đŸ€– What's Next for AI: Inference verification, risks, and workshops. ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Open House Buildathon Kicks Off - Schedule & FAQs ![HJFF4_gaUAIs1kl.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/HJFF4_gaUAIs1kl.jpeg) 3 weeks of technical workshops & mentorship. Everything early-stage teams need to bring their ideas from concept to an onchain business on the Arbitrum Platform. We gathered the workshop schedule and frequently asked questions for you. [Read the FAQs](https://x.com/ArbitrumDevs/status/2057539557986586975?s=20&ref=blog.arbitrum.foundation) ### AI Beyond the Hype: HoC & Frens ![HIsQlt7bEAACI__.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/HIsQlt7bEAACI__.jpeg) Are AI agents ready for real-world use? Can we trust AI with payments, privacy, and online truth? House of Chimera and Arbitrum co-hosted a space to help you understand what's risky and what comes next. [Listen to the X Space](https://x.com/i/spaces/1nGeLydoVzvKX?ref=blog.arbitrum.foundation) ### Meet the First Teams of the Arbitrum Mentorship Program Cohort 1 The first cohort of the Arbitrum Mentorship Program is live. 13 early-stage teams (selected from over 900 applicants!) are getting 8 weeks of hands-on technical, product, and go-to-market support to build and launch on Arbitrum. Check out the first spotlights below: âžĄïž [Twyne](https://x.com/ArbitrumDevs/status/2054259576820920641?s=20&ref=blog.arbitrum.foundation) âžĄïž [Capa](https://x.com/ArbitrumDevs/status/2054623046296822137?s=20&ref=blog.arbitrum.foundation) âžĄïž [Tilt](https://x.com/ArbitrumDevs/status/2055010722036478374?s=20&ref=blog.arbitrum.foundation) âžĄïž [Kustodia](https://x.com/ArbitrumDevs/status/2057052990004236400?s=20&ref=blog.arbitrum.foundation) ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### Verifying what your AI provider Actually Ran A new article from our Developer Relations team explains how verifiable AI with Lightweight Cryptographic Proofs of Inference would work, based on a new paper from Offchain Labs. [Learn How](https://x.com/hummusonrails/status/2059564599217652006?s=20&ref=blog.arbitrum.foundation) ### Onchain Trust for Offchain Workflows ![syndicate-testimonial.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/syndicate-testimonial.png) Syndicate replaced an offchain proving pipeline with a Rust contract on Stylus, and cut verification time from minutes to under a second. [Learn How](https://blog.arbitrum.io/onchain-trust-for-offchain-workflows/?ref=blog.arbitrum.foundation) ### 90 second Video on x402 on Arbitrum Learn how Arbitrum settlement works, and what teams shipping payments can get wrong. [Watch the Video](https://x.com/hummusonrails/status/2056632618804772928?s=20&ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### Start Earning Today on Arbitrum Swap from different chains, access yield opportunities, and manage vaults in one place. All in one place with access to leading protocols like Aave, Morpho, and Pendle. [Start Using Earn](http://portal.arbitrum.io/earn?ref=blog.arbitrum.foundation) ### Arbitrum Croses 10 Million Stablecoin Holders ![HIOKZ3BW4AAK_kW.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/HIOKZ3BW4AAK_kW.jpeg) With over 10 million stablecoin holders and $1 trillion transferred in a year, Arbitrum is the finance-native platform where the programmable economy settles. ### RobinhoodApp's Innovation Award Winner Advice for Founders BondCredit won the RobinhoodApp Innovation Award at Founder House New York. Here's what CEO, Nathan Vandy, had to say ahead of Founder House London: > I can only recommend Arbitrum Open House to any serious projects looking to build programmable businesses > > Winning the @RobinhoodApp Innovation Award at the New York, honestly shifted our company's trajectory more than I can put in words > > So whether you're building a protocol, application or agent, don't sleep on it. [More About Arbitrum Builder Programs](https://x.com/ArbitrumDevs/status/2046166754490200193?s=20&ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### Case Study: Building With Move on Arbitrum ![0426_Arbitrum_RatherLabs_CaseStudy.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/0426_Arbitrum_RatherLabs_CaseStudy-1.png) Rather Labs built a Move-to-WASM compiler, CLI tooling, and a framework for EVM interactions, useful for tokenized assets with tightly scoped mint and burn rights, collateral receipts and settlement workflows with clear permission boundaries. [Read the Full Article](https://blog.arbitrum.io/rather-labs-enabling-move-on-arbitrum/?ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### Why Building Your MVP With AI Is Not Enough ![HIxzEo5WEAAITMG (1).jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/HIxzEo5WEAAITMG--1-.jpeg) Arbitrum Foundation hosted a virtual talk on why building your MVP with AI is not enough at Ethereum Mexico hackathon. Registrations are open until June 6th. [Join the Hackathon](https://x.com/ethereum%5Fmexico/status/2057146390141075579?s=20&ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### AIP: Amended Release of Frozen ETH The ArbitrumDAO is voting on releasing 30,765.67 ETH frozen after the KelpDAO rsETH exploit. The coordinated recovery effort, led by Aave Labs, KelpDAO, LayerZero, EtherFi, and Compound, aims to make affected holders whole. Voting ends May 28th. [Track the AIP’s Progress](https://alt.gov.arbitrum.foundation/proposal/71236395575275509514809232906539225896862899916501711888027988560774655719183?govId=eip155:42161:0xf07DeD9dC292157749B6Fd268E37DF6EA38395B9&ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #018\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Builder's Block #017: $415k in Prizes at Open House London - Apply Now URL: https://blog.arbitrum.foundation/builders-block-017-415k-in-prizes-at-open-house-london-apply-now/ Last updated: 2026-05-13T15:58:18.000Z 💡 ****What's Important This Week** 💾 $415k in Prizes Up for Grabs at Open House London - Register Now đŸ€– How to Ship x402 Agentic Payments on AWS & Arbitrum đŸ› ïž B3OS - The Onchain Engine for Agentic AI, Integrated with ZeroDev on Arbitrum ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### $415,000 in Prizes & Grants at Open House London [![0426_OpenHouse_London_Prizes&Grants_TotalPrizes.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/0426_OpenHouse_London_Prizes-Grants_TotalPrizes.jpg)](https://openhouse.arbitrum.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-london-buildathon,oh-london-founder-house) Open House London, a global builder program + startup accelerator designed for founders to help them launch new businesses into the programmable economy on the Arbitrum Platform, features $415k in total prizes (our biggest pool to date). This [video](https://x.com/ArbitrumDevs/status/2052058623854194727?s=20&ref=blog.arbitrum.foundation) covers the full program and prize breakdown along with project ideas that we're looking for. Open House London is kicking off with Buildathon on May 25th - a 3-week, online global program helping early-stage teams turn ideas into onchain products on Arbitrum. âžĄïž [Apply for the Online Buildathon Now!](https://openhouse.arbitrum.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-london-buildathon,oh-london-founder-house) ### Open House London Sponsor Spotlight - Alchemy ![0426_OpenHouse_London_Sponsors_Internal_Alchemy.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/0426_OpenHouse_London_Sponsors_Internal_Alchemy.jpg) We're excited to welcome [@Alchemy](https://x.com/Alchemy?ref=blog.arbitrum.foundation) as a sponsor of Open House London. They provide enterprise infra and tooling to support today’s most widely used onchain products. Together with Alchemy, Open House is helping businesses shape the broader programmable economy on the Arbitrum Platform. âžĄïž [Check out the Announcement & Register Now](https://x.com/Alchemy/status/2052384397396217878?s=20&ref=blog.arbitrum.foundation) ### Arbitrum Mentorship Program Cohort 1 Project Spotlights The 1st Cohort of the Arbitrum Mentorship Program is underway. Selected from over 900 applicants, 13 early-stage teams across AI, payments, RWAs, and emerging DeFi are receiving 8 weeks of hands-on technical, product, and go-to-market support to launch on the Arbitrum Platform. Check out the first few spotlights below: âžĄïž [Carbon](https://x.com/ArbitrumDevs/status/2051305510218137858?s=20&ref=blog.arbitrum.foundation) âžĄïž [Prism](https://x.com/ArbitrumDevs/status/2051724329587790002?s=20&ref=blog.arbitrum.foundation) âžĄïž [T3tris](https://x.com/ArbitrumDevs/status/2052399138965471739?s=20&ref=blog.arbitrum.foundation) âžĄïž [Bond Credit](https://x.com/ArbitrumDevs/status/2052456738524369353?s=20&ref=blog.arbitrum.foundation) --- ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### Shipping x402 on AWS and Arbitrum [![x402.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/x402.jpeg)](https://x.com/hummusonrails/status/2049363842283544939?s=20&ref=blog.arbitrum.foundation) Shipping agentic payments onchain just got easier. The programmable economy is already built for that. [@hummusonrails](https://x.com/hummusonrails?ref=blog.arbitrum.foundation) breaks down exactly how: CloudFront, Lambda@Edge, CDK with AWS - all settling on the Arbitrum Platform. âžĄïž [Read More in the Article](https://x.com/hummusonrails/status/2049363842283544939?s=20&ref=blog.arbitrum.foundation) ### StylusPort - The Faster Path from Solana to Arbitrum for Builders [![0426_Arbitrum_OakSecurity_CaseStudy.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/0426_Arbitrum_OakSecurity_CaseStudy.png)](https://blog.arbitrum.io/migrating-from-solana-to-arbitrum/?ref=blog.arbitrum.foundation) Moving from Solana to the EVM means rebuilding your app from scratch. Oak Security built StylusPort, a structured workflow for translating Solana programs into Stylus contracts, enables teams to bring Rust smart contracts to the Arbitrum Platform without starting over - faster launches, lower costs, and an easier path into the programmable economy. âžĄïž [Read more in the Article](https://blog.arbitrum.io/migrating-from-solana-to-arbitrum/?ref=blog.arbitrum.foundation) ### B3OS is Live - The Onchain Engine for Agentic AI [![b3os.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/b3os.png)](https://b3os.org/?ref=blog.arbitrum.foundation) Integrated with [ZeroDev](https://zerodev.app/?ref=blog.arbitrum.foundation), the leading smart account infrastructure and development platform, B3OS enables users to architect the onchain economy of Arbitrum by combining ZeroDev’s smart accounts with gas sponsorship and session keys, and B3OS’s automation engine. Offering 20+ ready-made templates plus a visual builder called Caddie, B3OS makes it easy for anyone to create, monitor, and connect complex, onchain workflows. âžĄïž [Check out the Announcement and Demo](https://x.com/b3dotfun/status/2049534177909858731?ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### Welcome Offchain Offchain Labs [![offchain.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/offchain.jpeg)](https://www.offchain.io/?ref=blog.arbitrum.foundation) Previously known as Offchain Labs, Offchain will now embark on a new chapter foccusing on powering institutions as they move onchain. Over the years, what they've built across [Arbitrum](https://x.com/Arbitrum?ref=blog.arbitrum.foundation), [Prysm Ethereum Client](https://x.com/prylabs?ref=blog.arbitrum.foundation), & [ZeroDev](https://x.com/zerodev%5Fapp?ref=blog.arbitrum.foundation) are now coming together into something bigger. âžĄïž [Read more about the Rebrand](https://x.com/sgoldfed/status/2052483694829474111?s=20&ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### Arbitrum Nitro version 3.9.9 Upgrade A new Arbitrum Nitro version 3.9.9 is now available on Docker Hub with the following tag: `offchainlabs/nitro-node:v3.9.9-6b0af88-stripped`. This is an important release containing stability improvements and security fixes, and we recommend teams adopt it as soon as possible. âžĄïž [View the Official Release on GitHub](https://github.com/OffchainLabs/nitro/releases/tag/v3.9.9?ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### Agentic Payments & x402 Highlights at DevWorld and ETHPrague ![ethprage.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/05/ethprage.jpeg) Our DevRel Ben ([@hummusonrails](https://x.com/hummusonrails?ref=blog.arbitrum.foundation)) recently travelled to DevWorld and ETHPrague, and gave talks on Agentic Payments with x402, how this new primitive changes the frontier of commerce, and how Arbitrum as a Platform, provides the settlement layer for it all. âžĄïž [Check out his Recap](https://x.com/hummusonrails/status/2054164353650180154?s=20&ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### Oversight and Transparency Committee (OAT) - June 2026 Elections The Arbitrum DAO is officially opening applications for the Oversight and Transparency Committee. The OAT serves as a vital bridge between delegates and OpCo, ensuring transparency, fiscal accountability, and strategic alignment across the ecosystem. âžĄïž [Read the Full Election Overview](https://forum.arbitrum.foundation/t/oversight-and-transparency-committee-oat-june-2026-elections-overview/30872?ref=blog.arbitrum.foundation) ### \[Technical Contribution\] Resolving Stylus SDK 0.6.0 One developer has identified and documented a critical fix for developers building with the Stylus SDK (v0.6.0). The contribution addresses WASM evaluation panics caused by dependency conflicts in standard cryptographic libraries. Relevant for builders who are building with Stylus. âžĄïž [Read the Full Discussion](https://forum.arbitrum.foundation/t/technical-contribution-resolving-stylus-sdk-0-6-0-evaluation-panics-for-infrastructure-tooling/30774?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #017\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Builder's Block #016: Open House London Dates Locked & First Cohort of Mentorship Program URL: https://blog.arbitrum.foundation/builders-block-016-open-house-london-dates-locked-first-cohort-of-mentorship-program/ Last updated: 2026-04-29T13:56:55.000Z 💡 ****What's Important This Week** 🇬🇧 London Founder House taking place July 10-12, featuring $300K in prizes and grants 📚 13 teams have been selected for Cohort 1 of the Arbitrum Mentorship Program, beginning an 8-week path to launch đŸ€– Winners for the ArbiLink Agentic Bounty have been announced ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Everything you need to know for Open House London [![0426_OpenHouse_London_1920x1080.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/0426_OpenHouse_London_1920x1080-1.png)](https://openhouse.arbitrum.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-london-buildathon) Applications for Open House London are still open. It kicks off with a 3-week online Buildathon, running from May 25 - June 14, where teams can go from idea to product with $115K in prizes and grants up for grabs. The journey continues with an in-person Founder House in London from July 10-12, bringing together top builders to compete for an additional $300K while refining, shipping, and launching in the programmable economy on Arbitrum. âžĄïž[Check out the Buildathon's prize breakdown & Apply now](https://x.com/ArbitrumDevs/status/2046166754490200193?s=20&ref=blog.arbitrum.foundation) ### 13 teams have been selected for the Arbitrum Mentorship Program [![IMG_7690.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/IMG_7690.png)](https://blog.arbitrum.foundation/meet-the-builders-the-first-cohort-of-arbitrum-mentorship-program/) 900+ teams applied to the Arbitrum Mentorship Program - 256 DeFi, 153 infra, 120 AI, 110 payments, 88 RWA. Builders aren’t experimenting anymore, they’re committing across every vertical that matters, and they’re choosing to build and launch real products into the programmable economy on the Arbitrum platform. 13 teams have been selected for Cohort 1, each entering an 8-week program of hands-on mentorship, operator-led workshops, and direct access to leading investors and ecosystem partners, all focused on getting to launch. âžĄïž [Read more about the teams](https://blog.arbitrum.foundation/meet-the-builders-the-first-cohort-of-arbitrum-mentorship-program/) ### Winners for the ArbiLink Agentic Bounty Announced [![WINNERS ANNOUNCEMENT.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/WINNERS-ANNOUNCEMENT.png)](https://x.com/ArbitrumDevs/status/2044785347536846969?s=20&ref=blog.arbitrum.foundation) The ArbiLink Agentic Bounty blew past expectations. We've recieved so many strong submissions and picking winners wasn’t easy. But here they are. The Top 3 winning projects each get $250 in prizes, and one project gets a sponsored trip to Open House London! âžĄïž [Meet the winners and check out their projects](https://x.com/ArbitrumDevs/status/2044785347536846969?s=20&ref=blog.arbitrum.foundation) ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### The Rise of Agentic Payments & how Arbitrum Fits In Agentic payments are becoming a requirement. With Cloudflare rolling out agent-readiness scanners that surface standards like x402, the shift toward machine-native payment flows is already underway. Arbitrum provides the speed, low costs, and liquidity needed to make these flows viable at scale. This blog breaks down what’s changing and how to build for it. âžĄïž [Read more in the article](https://x.com/hummusonrails/status/2047564195193917648?s=20&ref=blog.arbitrum.foundation) ### Building Secure Key Management for AI Agents ![HGcgn3pW8AEC_-4.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/HGcgn3pW8AEC_-4-1.jpeg) Learn how to securely manage keys for AI agents with a process-isolated KMS built on top of @OpenWallet. Instead of exposing private keys, agents are issued scoped tokens while signing happens in fully isolated infrastructure, keeping secrets out of the same environment as your LLM. A more secure, production-ready approach for teams building agentic workflows onchain. âžĄïž [Read more in the article](https://x.com/blockbyvlog/status/2046934195797188815?s=20&ref=blog.arbitrum.foundation) > Building Secure Key Management for AI Agents > > Last week, [@VitalikButerin](https://twitter.com/VitalikButerin?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) explained his mental model on LLM agents and why they need sandboxing, because “malicious activity can happen too quickly to be detected.” > > That's why I built a process-isolated KMS to manage agents' secrets
 [pic.twitter.com/fNss0HRTKZ](https://t.co/fNss0HRTKZ?ref=blog.arbitrum.foundation) > > — Daniel Ortega (@blockbyvlog) [April 15, 2026](https://twitter.com/blockbyvlog/status/2044416593728545275?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### Global Markets are Becoming Programmable [![0426_Arbitrum_Welcome_ProgrammableEconomy_Blog (1).png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/0426_Arbitrum_Welcome_ProgrammableEconomy_Blog--1-.png)](https://blog.arbitrum.io/welcome-to-the-programmable-economy/?ref=blog.arbitrum.foundation) Global markets are becoming programmable, where access, settlement, and coordination are defined in software instead of intermediaries. This is turning financial infrastructure into composable building blocks for faster, more flexible markets. But enterprise adoption depends on execution, reliability, and scale. Arbitrum is where this becomes real: a finance-native execution layer powering programmable markets with the performance and liquidity institutions need. âžĄïž [Read more in the blog](https://blog.arbitrum.io/welcome-to-the-programmable-economy/?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### Meet ARBuilder: your AI dev teammate on Arbitrum ![HGVJZOyWoAAg4yX.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/HGVJZOyWoAAg4yX.jpeg) A new tool just came to town built by Quantum3Labs (the same team behind [Scaffold Stylus](https://www.scaffoldstylus.com/?ref=blog.arbitrum.foundation)). If you’re building on Arbitrum, here’s an easier way to ship faster. ARBuilder lets you describe what you want - Stylus contracts, bridges, dApps, Orbit L3s - and you'll get working, verified code ready to use. Powered by 19 specialized tools, live docs, and a 3-stage reranking pipeline, it keeps outputs accurate, up-to-date, and compile-ready across Cursor, VS Code, Windsurf, Claude Code, and its web playground. From idea to deployment, without the usual friction. âžĄïž [Read the full technical breakdown & Try it youself](https://x.com/Q3Labs/status/2046507404343247287?s=20&ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### ERC-8063 Reference Implementation on Arbitrum One A new proposal that brings ERC-8063 (Groups: Membership Tokens) to Arbitrum One through a full reference implementation. ERC-8063 defines a membership-token primitive for token-gated access, enabling use cases like loyalty programs, governance tiers, and membership-based systems. Relevant if you’re building token-gated apps, onchain loyalty systems, or composable access layers. âžĄïž [View Proposal](https://forum.arbitrum.foundation/t/grant-request-deakee-erc-8063-reference-implementation-on-arbitrum-one-75k-arb/30819?ref=blog.arbitrum.foundation) ### \[Constitutional\] AIP: Approve Release of Frozen ETH Following the rsETH (KelpDAO) exploit, the Arbitrum Security Council acted quickly on April 21 to freeze \~30,765 ETH tied to the attacker, marking a major moment in onchain incident response. A new governance proposal now suggests releasing these funds into a coordinated recovery effort led by ecosystem teams like Aave, LayerZero, and others, highlighting how Arbitrum’s governance can step in to support users and reinforce the system in real time. âžĄïž [View Proposal](https://forum.arbitrum.foundation/t/constitutional-aip-approve-release-of-frozen-eth/30825?ref=blog.arbitrum.foundation) ### March 2026 Security Council Election: Member Election The Arbitrum Security Council elections are underway, with the final Member Election phase running until May 3; delegates are now voting to select the next cohort responsible for critical security decisions, making participation especially important following recent events. âžĄïž [Find out how to cast your votes](https://forum.arbitrum.foundation/t/march-2026-security-council-election-member-election/30773?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #016\. Thanks for reading - and keep building. Arbitrum Everywhere. ### Meet The Builders: The First Cohort of Arbitrum Mentorship Program URL: https://blog.arbitrum.foundation/meet-the-builders-the-first-cohort-of-arbitrum-mentorship-program/ Last updated: 2026-04-29T13:32:31.000Z Supporting early-stage teams is critical to the growth of the programmable economy. Early decisions around infrastructure, distribution and product design shape how businesses scale and ultimately define what the next generation of onchain products looks like. That’s why the Arbitrum Foundation launched the Mentorship Program in February to back builders at the earliest stage where the next generation of onchain products is being defined. Over **900 teams applied,** signaling growing demand from early-stage teams looking to build in environments where they can move at software speed, access deep liquidity, and scale without giving up control over how their products operate. The interest from teams spanned every major vertical shaping the programmable economy from DeFi (256) to infrastructure (153), AI (120), payments (110), and RWAs (88). Together, it points to a broader shift: early-stage teams are choosing where they can define how their businesses run - programmable on the Arbitrum Platform. Teams will collaborate closely with our ecosystem partners, including **Pendle, Variational, IOSG, and Horizen Labs**, and have access to curated introductions to top-tier venture partners such as **Pantera Capital, Electric Capital, Lightspeed, and Tandem by Offchain Labs.** Let’s welcome the first 13 early-stage teams into the cohort. ### **Meet the Teams Building the Programmable Economy** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/image.png) [**Carbon**](https://x.com/CarbonTerminal?s=20&ref=blog.arbitrum.foundation) DEX traders today face thin liquidity, volatile funding rates, and limited markets. Every exchange builds its order book from scratch. Carbon taps into existing off-chain markets. Full TradFi liquidity, onchain. Every other DEX recreates liquidity. Carbon plugs into it. 750+ markets, stable rates, tighter spreads [**Prism**](https://x.com/PrismFi%5F?s=20&ref=blog.arbitrum.foundation) Building the rails for tomorrow's onchain finance. The space is powerful but fragmented. Users bounce between eight apps to do what belongs in one. Swap here, launch there, trade perps somewhere else. Prism brings every primitive into a single superapp: AMM, launchpad, prediction markets, perps and more. All through organic traction [**LayerV**](http://www.layerv.com/?ref=blog.arbitrum.foundation) Options are the backbone of traditional finance, but the primitive barely exists onchain despite years of attempts by protocols. On the Arbitrum Platform, traders can access deep perps and spot liquidity yet have no venue for real options flow. LayerV is building that venue, pairing the market structure and risk engineering that made Deribit the dominant options exchange with the DeFi-native distribution the team already proved on BNB Chain, where their prior product generated $43M+ in revenue [**T3tris**](https://x.com/t3tris%5Ffinance?s=20&ref=blog.arbitrum.foundation) T3tris helps asset managers go onchain. No compromises. Today, the infrastructure either doesn't fit professional strategies, costs too much, or requires permission to access. T3tris removes all three. Deploy a vault, attract capital, and run any strategy from day one on the Arbitrum Platform. [**Twyne**](https://x.com/twynexyz?s=20&ref=blog.arbitrum.foundation) Over half the borrowing capacity on DeFi lending markets sits unused. Lenders earn yield but their borrowing power does nothing. Borrowers are stuck with conservative LTVs that limit leverage and trigger early liquidations. Twyne is the credit delegation layer that connects both sides, built on top of Euler and Aave. [**Capa**](https://x.com/capa%5Ffi?s=20&ref=blog.arbitrum.foundation) Moving money across emerging markets still means fragmented rails, slow settlement, and compliance headaches for every institution involved. Capa already solved this on the Arbitrum Platform. $2M ARR, $150M monthly TPV and +30% MoM growth. [**USDre**](https://x.com/EstateProtocol?s=20&ref=blog.arbitrum.foundation) Real estate tokenization has stalled in DeFi because protocols can't underwrite idiosyncratic property risk. USDre takes the opposite approach: instead of putting individual properties onchain, it standardizes real estate financing into a single fungible credit primitive that protocols can use as collateral. It's the missing liquidity layer between real estate credit markets and onchain capital. [**Reinforce.fi**](https://x.com/reinforce%5Ffi?s=20&ref=blog.arbitrum.foundation) Billions in Tron USDT sit idle across emerging markets because users want yield, but not DeFi complexity, CEX opacity, or trust risk. Reinforce.fi gives them xUSD: a self-custodial onchain dollar that provides transparent market-neutral yield strategies on the Arbitrum Platform. [**Tilt Protocol**](https://x.com/tiltprotocol?s=20&ref=blog.arbitrum.foundation) Emerging fund managers have real strategies, but launching a hedge fund takes months and heavy ops. Tilt Protocol turns a strategy into an investable tokenized-stock fund you can launch and run in one place. Anyone with alpha can become investable without months of setup. Already live on Robinhood Chain testnet with launched strategies from independent funds. [**Bond.Credit**](https://x.com/bondoncredit?s=20&ref=blog.arbitrum.foundation) AI agents are transacting onchain but have no financial identity. They have activity but no standardized credit history. Performance, but not underwritten credit capacity. Access to rails, but not structured access to capital. bond.credit is building the credit layer for autonomous finance: onchain scoring, TEE-verified algorithms, and monitored credit vaults, all live on the Arbitrum Platform. [**Kustodia**](https://x.com/Kustodia%5Fmx?s=20&ref=blog.arbitrum.foundation) High-value transactions in LATAM rely on slow, trust-dependent high risk traditional payments. Kustodia puts the money itself onchain. Live on the Arbitrum Platform with real escrow type transactions using MXNB, including the first real estate,vehicle and services escrows executed onchain. ### **What Can Early-Stage Teams Expect** The Mentorship Program runs for **eight weeks and kicked off on April 13, 2026,** and is built to back early-stage teams launching their products on the Arbitrum Platform. The first month focuses on supporting early-stage teams on building their onchain products with sessions led by industry leaders across product strategy, go-to-market, liquidity design, distribution and fundraising. Throughout the program, each early-stage team is paired with a dedicated mentor, working through biweekly 1:1s and ongoing feedback as they build with ecosystem industry leaders, including Pendle, Variational, IOSG, and Horizen Labs. The second month shifts into execution. Teams refine their product and go-to-market through focused workshops and prepare for pitching with investors via curated introductions and a final $100K prize Demo Day - with participation from partners like Pantera Capital, Electric Capital, Lightspeed and Tandem by Offchain Labs. The **top three teams** **will receive $100K in non-dilutive awards** recognizing standout execution and progress. ### **Opportunities for Early-Stage Teams** As the programmable economy continues to take shape, more early-stage teams are looking for the right environment to build, ship, and grow their products onchain. The Arbitrum Foundation’s next Open House heads to London bringing the same build-first format that kicked off in New York. It starts with an [online Buildathon](https://openhouse.arbitrum.io/?utm%5Fsource=mentorship&utm%5Fmedium=blog&utm%5Fcampaign=oh-london-buildathon,oh-london-founder-house) and culminates in an in-person [Founder House](https://luma.com/openhouse-london?utm%5Fsource=mentorship&utm%5Fmedium=blog&utm%5Fcampaign=oh-london-founder-house,oh-london-buildathon), where teams work alongside industry leaders, join hands-on workshops, and compete for prizes. For early-stage teams ready to turn ideas into real products and build in the programmable economy, this is where it starts, on the Arbitrum Platform. [**Apply to Open House London today**](https://openhouse.arbitrum.io/?utm%5Fsource=mentorship&utm%5Fmedium=blog&utm%5Fcampaign=oh-london-buildathon,oh-london-founder-house)**.** ### Builder's Block #015: Apply for Open House London & New Wallet Standards on Arbitrum URL: https://blog.arbitrum.foundation/builders-block-015-apply-for-open-house-london-new-wallet-standards-on-arbitrum/ Last updated: 2026-04-15T12:03:35.000Z 💡 ****What's Important This Week** 🇬🇧 Open House London Buildathon kicks off May 25th. Apply today. 📚 Arbitrum Mentorship Program Applications Closed with 900 Submissions ⚡ ERC-7715 and Open Wallet Standard are now live on Arbitrum ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Open House London: Buildathon Applications Now Open ![0426_OpenHouse_London_1920x1080.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/0426_OpenHouse_London_1920x1080.png) Open House London kicks off May 25th with an online buildathon. Connect with top teams, get hands-on support, and showcase what you're building on Arbitrum. NYC saw 1,700+ builders, 177 projects, and $340K awarded across payment rails, agentic commerce, prediction markets, and tokenized assets. London is next. âžĄïž [Apply to Open House London](https://openhouse.arbitrum.io/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=oh-london-buildathon) ### First Arbitrum Mentorship Program Applications are Now Closed Applications for the Arbitrum Mentorship Program are now closed as of April 7th. We saw strong interest from early-stage teams looking to build on Arbitrum, and we’re excited about the cohort taking shape. Selected teams will undergo eight weeks of hands-on mentorship with industry experts, culminating in a Demo Day in front of top-tier investors. Stay tuned - we’ll be sharing more on the final cohort soon. ### Agentic Bounty Challenge Has Concluded with 30+ Applications ![agentic_bounty.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/agentic_bounty.jpeg) The ArbiLink Agentic Bounty has ended on April 3rd, and we're no longer accepting submissions. Huge thank you to everyone who built and participated - we’ve seen some really strong submissions come through! We’ll be reviewing entries and announcing results soon. Stay tuned! âžĄïž [Follow us for the latest updates](https://x.com/ArbitrumDevs?ref=blog.arbitrum.foundation) --- ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### Best Practices for Agentic Wallets with MoonPay OWS [![open_wallet_standard.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/open_wallet_standard.jpeg)](https://x.com/blockbyvlog/status/2041518606320640099?s=20&ref=blog.arbitrum.foundation) Learn how to design secure agent wallets using the Open Wallet Standard (OWS) by MoonPay, with encrypted local vaults and a policy engine to manage permissions safely. Covers why current setups fall short and how to implement a more robust architecture for AI agents in practice. âžĄïž [Watch the Video](https://x.com/blockbyvlog/status/2041518606320640099?s=20&ref=blog.arbitrum.foundation) ### Rust Onchain: A Backend Engineer's Guide to Stylus [![0326_Arbitrum_Blog_Stylus_BackednEngineers_1200x600.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/0326_Arbitrum_Blog_Stylus_BackednEngineers_1200x600.jpg)](https://blog.arbitrum.foundation/rust-onchain-a-backend-engineers-guide-to-stylus/) Learn how to move backend computation onchain with Arbitrum Stylus, using Rust to build verifiable, tamper-proof logic without changing your stack. Walks through a real scoring engine architecture, shared types across onchain/offchain, and why WASM unlocks major compute savings. âžĄïž [Read the Blog](https://blog.arbitrum.foundation/rust-onchain-a-backend-engineers-guide-to-stylus/) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### Advanced Permissions (ERC-7715) is now live on Arbitrum [![Metamask_Advanced_Permissions.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/Metamask_Advanced_Permissions.png)](https://x.com/MetaMaskDev/status/2041139203241545959?s=20&ref=blog.arbitrum.foundation) Agents and apps can now request scoped permissions from MetaMask users to execute transactions on their behalf. âžĄïž [Learn More Here](https://x.com/MetaMaskDev/status/2041139203241545959?s=20&ref=blog.arbitrum.foundation) ### L1 vs L2: Choosing The Right Chain Understand why choosing between L1 and L2 is a critical decision when building onchain, from cost and scalability to long-term architecture. Here’s why Robinhood chose to launch on Arbitrum. âžĄïž [Watch the Full Video](https://youtu.be/hjg9wLxypDs?si=UuToTmuENHQlFBWj&ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### ArbiLink Highlights in EthCC Cannes [![arbilink_cannes.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/04/arbilink_cannes.jpeg)](https://x.com/arbitrum/status/2041603477953011925?s=20&ref=blog.arbitrum.foundation) ArbiLink Cannes was incredible! đŸ‡«đŸ‡· So many great conversations with founders and investors on agentic DeFi, payments, tokenization and infrastructure. âžĄïž [Check out the Recap Video](https://x.com/arbitrum/status/2041603477953011925?s=20&ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #015\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Open House London: Registration Is Now Open URL: https://blog.arbitrum.foundation/open-house-london-registration-is-now-open/ Last updated: 2026-04-14T11:22:56.000Z Registration is now open for Open House London, the next stop in the 2026 cross-continental program. London runs the same format that made New York work - a three-week online Buildathon followed by a three-day in-person Founder House a month later, with technical workshops, product sessions, dedicated mentorship hours and live pitches. Builders will have direct access throughout the program to teams from the Arbitrum Foundation, Offchain Labs and ecosystem partners. With **$415K in prizes and grants up** for grabs, we encourage early-stage founders and builders to apply. Whether you already have a project you’re working on that you want to take to the next level - or whether you’re starting from scratch - Open House London matches your builder energy with dedicated support and resources to enable your next onchain business. If you are building on Arbitrum or thinking about it, this is the place to be [Register Now](https://arbitrum-london.hackquest.io/?utm%5Fsource=arbitrum-blog&utm%5Fmedium=blog&utm%5Fcampaign=oh-london-buildathon) ## **Prize Breakdown** A total of $415K has been earmarked for OH London across its Buildathon and Founder House programs. The Arbitrum Foundation and the Robinhood Chain jointly sponsor the prizes and grants for OH London. ### **OH Buildathon** **Open Category - $70K** The top three buildathon winners will take home $70K. The prize split is as follows: - 1st Place - $40K USDC - 2nd Place - $20K USDC - 3rd Place - $10K USDC A minimum of one of the top three spots will be reserved for a project building on the Robinhood Chain. **AI Agentic Category - $15K** A special category has been reserved for AI agents building on Arbitrum and the Robinhood Chain. The top three winners under this category will share $15K in prizes. At least one out of the top three spots is reserved for projects building on the Robinhood Chain. **Grants - $30K** In addition to the above prizes, $30K USDC has been reserved as grants by the Arbitrum Foundation for winning teams on a case-by-case basis. ### **OH London Founder House** **Open Category - $120K** The top three OH London Founder House winners will take home $120K in total, split as follows: - 1st Place - $60K USDC - 2nd Place - $40K USDC - 3rd Place - $20K USDC Of the top three, at least one will be selected from projects building on the Robinhood Chain. **Robinhood Chain Founder-in-Residence - $60K** This is a special category reserved for projects building exclusively on the Robinhood Chain and fully sponsored by the Robinhood team. **Robinhood Chain Innovation Award - $30K** Teams exhibiting outstanding innovation are eligible for this award. This is reserved for projects building on the Robinhood Chain only and is fully sponsored by the Robinhood team. **AI Agentic Category** **\- $20K** A special category has been reserved for AI agents building on Arbitrum and the Robinhood Chain. The top three winners under this category will share $20K in prizes. At least one out of the top three is reserved for projects building on the Robinhood Chain. **Grants - $70K** In addition to the above prizes, $70K USDC has been reserved as grants by the Arbitrum Foundation to winning teams on a case-by-case basis. Winning teams will receive a portion of the prize money upfront and the remainder tied to development-based milestones, which apply to all tracks except the Agentic categories. ## What OH New York delivered [Open House NYC](https://blog.arbitrum.foundation/nyc-founder-house-concludes-with-340k-in-awards-to-winning-teams/) ran in early March and set the benchmark for the programme. 1712 builders engaged across offline and online activations. 177 projects submitted. $340,000 in prizes and grants awarded. What stood out was the direction of what teams built. Project after project targeted the same gap - the operational services layer that institutional tokenization still lacks. **Tilt Protocol** took $100K in Robinhood Founder in Residence seed funding for an AI-driven management layer on tokenized real-world assets, built natively on Robinhood Chain. **Bond.Credit** won Robinhood's $50K Innovation Award for a credit underwriting engine for autonomous trading agents. **Kustodia** took first place with $60K for programmable escrow across real estate and automotive - fiat to stablecoin, no wallet required. **EqualFi**, which placed third, is already live on the Robinhood Chain testnet with nine index tokens deployed across crypto and stock-based baskets. **Laytus**, in second, introduced a structured prediction market protocol addressing mispriced correlated risk. Winning teams were taken into the Open House Mentorship Programme - eight weeks, equity-free, with up to $100K in additional non-dilutive awards and a Demo Day in front of leading venture firms. **Open House Dubai Postponed** We are postponing Open House Dubai until further notice due to the ongoing regional security situation in the Middle East. We will continue to monitor the situation and hope to be able to reschedule the event towards the end of the year. Registered Dubai participants need to take no further action at this time. We will be in touch if and when we are able to reschedule the event. ### Builder's Block #014: ArbiLink Agentic Bounty is Live & Mentorship Program Partners Announced URL: https://blog.arbitrum.foundation/builders-block-014-arbilink-agentic-bounty-is-live-mentorship-p-partners-announced/ Last updated: 2026-04-01T13:30:59.000Z 💡 ****What's Important This Week** đŸ€ Partners announced for the ****Arbitrum Mentorship Program** đŸ€– Join the ****Agentic Bounty Challenge** and win a trip to Open House London 📊 Arbitrum Foundation's ****6th annual report is now live** ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Variational, USD.AI, and Pendle Join Arbitrum Mentorship Program [![HEJco_NbMAAIeHW.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/HEJco_NbMAAIeHW.png)](https://blog.arbitrum.foundation/introducing-the-arbitrum-mentorship-program-access-capital-and-strategic-support/) Three ecosystem leaders are joining as mentors for the Arbitrum Mentorship Program, covering product strategy, go-to-market, liquidity, and fundraising. If you're building on Arbitrum and want structured support from teams who've done it, this is worth applying for. Applications are open now. âžĄïž [Apply for the Mentorship Program Now](https://tally.so/r/aQdj2W?ref=blog.arbitrum.foundation) ### Arbitrum Foundation Publishes 6th Annual Transparency Report [![HEIJaEDakAAAb2V.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/HEIJaEDakAAAb2V.jpg)](https://blog.arbitrum.foundation/the-arbitrum-foundation-2025-transparency-report-the-year-of-institutional-adoption/) The Foundation's 6th annual report covers protocol upgrades, DAO activity, treasury usage, and ecosystem growth across 2025. Beyond performance gains, the focus shifted toward building open, sustainable infrastructure at scale while continuing to ship meaningful upgrades. Worth a read if you want the full picture on where the protocol stands. âžĄïž [Read the Annual Transparency Report](https://blog.arbitrum.foundation/the-arbitrum-foundation-2025-transparency-report-the-year-of-institutional-adoption/) ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### Deploy AI Agents with LangChain on Arbitrum Learn how to wire up dynamic contract tools with LangChain, connect to Arbitrum, and send transactions out with an AI Agent in under 8 minutes. Covers the full loop from tool registration to on-chain execution, with working code you can fork. âžĄïž [Watch the Video](https://x.com/blockbyvlog/status/2036779054318137687?ref=blog.arbitrum.foundation) ### Avail x Arbitrum Workshop: Cross-Chain Liquidity for Arbitrum dApps [![HDyA0d9a4AAfJ_L.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/HDyA0d9a4AAfJ_L-1.jpg)](https://x.com/i/broadcasts/1yGBeMpBQRpKN?ref=blog.arbitrum.foundation) The recorded workshop walks through how Arbitrum apps can query and verify data from any chain using Avail's DA layer. Useful if you're building cross-chain infrastructure or need cheap, verifiable off-chain data access. âžĄïž [Watch the Workshop](https://x.com/i/broadcasts/1yGBeMpBQRpKN?ref=blog.arbitrum.foundation) ### Rust vs Solidity: Business Logic Efficiency with Arbitrum Stylus ![dfwefefwefew.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/dfwefefwefew.png) Discover the scoring engine to measure Rust vs. Solidity performance head-to-head: a standard Rust API owns the business rules in a DB and calls a Stylus contract on Arbitrum as the compute layer. The video breaks down when it's worth reaching for Rust in your backend. âžĄïž [Read the Thread](https://x.com/hummusonrails/status/2034586780628889921?ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### OWS Now Supports Arbitrum for AI Agent Wallets ![HEGb4gjXkAAXOtR.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/HEGb4gjXkAAXOtR.jpg) The Open Wallet Standard (OWS) by MoonPay is a cross-chain wallet standard built with AI agents in mind. It handles key storage, wallet management, and transaction signing locally and policy-gated, so your agent can operate on-chain without you compromising on spending controls. Arbitrum support is now live. Worth looking at if you're building autonomous agents and custody is a concern. âžĄïž [Read about the Announcement](https://x.com/moonpay/status/2036081106303222258?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### Arbitrum Sepolia Node Operators: Upgrade to Nitro 3.9.8 Now On March 23, Arbitrum Sepolia experienced a partial outage. Functionality was restored the same day. Out of an abundance of caution, all node operators across all Arbitrum chains are encouraged to upgrade to Nitro 3.9.8 at their earliest convenience. The release is available as a Docker image on Docker Hub. âžĄïž [Read the Thread](https://x.com/ArbitrumDevs/status/2036847224634695838?ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### Agentic Bounty Challenge: Build AI x Onchain, Win up to $250 USDC or a Trip to Open House London The Agentic Bounty is live and open to everyone online. Build something that connects AI agents to Arbitrum: deploying contracts, using wallets, reading onchain data, bridging assets, or interacting with ecosystem protocols, all in scope. 🏆 $250 USDC for top 3 ✈ Chance to win a funded trip to Arbitrum Open House London 🌍 Open to everyone (online) 🗓 Starts now → Ends Apr 3, 19:30 CET âžĄïž [Join the Challenge](http://notion.so/arbitrumfoundation/Arbitrum-Open-House-London-Challenge-Agent-Bounty-32c90457c3268012b69efd3a5ee7ea46?utm%5Fsource=twitter&utm%5Fmedium=social&utm%5Fcampaign=oh-london-founder-house&utm%5Fcontent=gentic-bounty-notion-page-arbilink) ### ArbiLink at ETHCC Cannes: Happening Today ![converted_image.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/converted_image.jpg) ArbiLink Cannes is designed to create real connections and highlight what’s happening across Arbitrum today. - Insightful talks and panels featuring ecosystem leaders - Real-world use cases and enterprise adoption conversations - High-signal networking with builders and founders - A relaxed, social atmosphere with drinks and canapĂ©s âžĄïž [Register on Luma](https://luma.com/arbilink-ethcc2026?ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### Security Council Elections: 12 Nominees Advance to Compliance Stage The nominee selection phase concluded, with 12 applicants moving forward to the compliance stage. If you're following the Security Council election cycle, the qualified nominee list is now public. âžĄïž [View Qualified Nominees:](https://www.tally.xyz/gov/arbitrum/council/security-council/election/5/round-1?ref=blog.arbitrum.foundation) ### ArbOS 60 Elara Upgrade Proposed for Arbitrum One and Nova A constitutional AIP is up for temperature check proposing to upgrade both Arbitrum One and Arbitrum Nova to ArbOS 60 Elara. Worth tracking if you're maintaining contracts or infrastructure that could be affected by protocol-level changes. âžĄïž [View the Temp-Check](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth/proposal/0x04d6219c392f3f6187779f609d6cad21e3b3d6091809355ad12ba6bb39b55834) ### DAO Proposes Transitioning Code of Conduct to a Living Document A temp-check proposes moving the Code of Conduct and DAO Procedures away from a trial-based framework and into a persistent, living document maintained by the OpCo. Relevant if you participate in governance or submit AIPs. âžĄïž [View the Temp-Check](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth/proposal/0xf78c223115031090b918ea09fa585d340718a426a21eb1556d81d19892e10b39) ### Proposed Enhancements to the Arbitrum Audit Program A new proposal introduces operational improvements to the Arbitrum Audit Program. If you're planning to go through an audit or are involved in the security review process, the proposed changes are worth reviewing before they move to a full vote. âžĄïž [View Proposal](https://forum.arbitrum.foundation/t/improvements-to-the-arbitrum-audit-program/30697?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #014\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Three Years of ArbitrumDAO: The Path to Arbitrum Everywhere URL: https://blog.arbitrum.foundation/three-years-of-arbitrumdao-the-path-to-arbitrum-everywhere/ Last updated: 2026-03-31T13:11:33.000Z Three years ago, ArbitrumDAO began as an experiment in shared stewardship. Today, it stands as a working model for how decentralized communities can govern capital, infrastructure, and long-term strategy at scale. In a period marked by skepticism toward DAOs, Arbitrum has distinguished itself through execution rather than ideological posturing. Its growth shows that when incentives align and participation is sustained, decentralized coordination can produce resilient, high-performance economic systems. This anniversary is more than a milestone. It is a signal that decentralized governance can endure and compound. To mark this moment, the Arbitrum Foundation has launched the [**ArbitrumDAO Third Anniversary Commemorative Collective**](https://opensea.io/collection/arbitrumdao-celebrating-the-third-anniversary/?ref=blog.arbitrum.foundation) on OpenSea. This onchain artifact symbolizes three years of decentralized governance, coordination, and progress. More than a collectible, it reflects a conviction that the future of economic infrastructure will be collectively governed and continuously built in public. ### Stewarding a Sustainable Onchain Economy Over the past three years, ArbitrumDAO has evolved from an allocator of tokens into a steward of robust economic infrastructure. This transformation has helped position Arbitrum as the preferred blockchain platform for leading global fintechs such as Robinhood and institutional allocators, including BlackRock and Franklin Templeton. Today, the DAO oversees a strategically diversified treasury and governs all protocol upgrades to the network. It has strengthened its financial resilience through diversified holdings spanning ETH, real-world assets, and stable instruments, while building multiple revenue streams designed to support long-term sustainability. Governance-led initiatives such as **Timeboost and Treasury Management** have expanded Arbitrum’s economic toolkit, reducing reliance on transaction fees and enabling more stable, productivity-driven growth. As a result, Arbitrum has emerged as one of the highest-margin infrastructure businesses in crypto. This evolution reflects a structural shift from growth driven by token distribution to growth anchored in economic productivity. In 2025 alone, Arbitrum generated [**$23.49M**](https://dune.com/entropy%5Fadvisors/arbitrum-dao-financials?ref=blog.arbitrum.foundation) **in gross profit**, with **Timeboost contributing approximately** [**$7M**](https://dune.com/entropy%5Fadvisors/arbitrum-timeboost?ref=blog.arbitrum.foundation) **in revenue** and treasury strategies delivering sustained yield. As of writing, the DAO holds roughly[**2.66B**](https://dune.com/entropy%5Fadvisors/arbitrum-dao-treasury?ref=blog.arbitrum.foundation) **ARB in its treasury**, reinforcing its long-term financial resilience. Crucially, Arbitrum compounds this advantage by reinvesting returns into ecosystem growth with measurable impact, rather than extracting value, strengthening a flywheel of productivity-led expansion. These outcomes reflect broader ecosystem momentum in 2025\. **Robinhood launched 2000+ tokenized securities on Arbitrum**, and the value of real-world assets on the network exceeded $800 million. Stablecoin supply grew [80%](https://tokenterminal.com/explorer/projects/arbitrum/metrics/ecosystem-stablecoin-supply?interval=max&ref=blog.arbitrum.foundation) year over year, lifetime transactions crossed [2.1 billion](https://dune.com/entropy%5Fadvisors/arbitrum-one-network-overview?ref=blog.arbitrum.foundation), and more than [1,000](https://portal.arbitrum.io/projects?chains=arbitrum-one%5Farbitrum-nova%5Fapechain%5Fconverge%5Fcorn%5Fdegen%5Fdrtc-chain%5Febi-xyz%5Fedu-chain%5Fethereal%5Fevedex%5Fflynet%5Fgravity-chain%5Finjective%5Fplume%5Frari-mainnet%5Freya%5Fsanko%5Fxai%5Fxchain&subcategories=lsts%5Faction%5Fadventure%5Fcasual%5Fgamefi%5Fracing%5Frpg%5Fstrategy%5Fartificial-intelligence%5Fdepin%5Fnft-tooling%5Fdex%5Fpayments%5Fbridge%5Fanalytics%5Fdex-aggregator%5Fsocial%5Fcentralized-exchanges%5Fdefi-tool%5Fprediction-markets%5Fwallet%5Fdeveloper-tool%5Flending%5Ftoken-launcher%5Ffiat-on-ramp%5Foracle%5Fgrowth%5Fdao-tool%5Fliquidity-management%5Fnft-marketplace%5Finfra-and-tools-other%5Fstablecoin%5Fnft-collection%5Fnode-provider%5Fperpetuals%5Fsecurity-tool%5Fcrypto-taxes%5Foptions%5Frwa%5Finsurance&ref=blog.arbitrum.foundation) projects were building on Arbitrum by year-end. ### Participation Powers The DAO The strength of ArbitrumDAO lies in its participation. Without active contributors, delegates, and builders shaping decisions, a DAO is little more than an empty promise. Over the past three years, ArbitrumDAO has demonstrated that sustained participation at scale is possible. Governance activity has steadily deepened across the ecosystem with 72 onchain proposals, 401 offchain proposals, and 296 discussions on the Arbitrum Forum. Beyond raw activity, the quality of governance has strengthened meaningfully. In 2025, **ArbitrumDAO averaged 213M votes per proposal, a 28% YoY increase, while active delegated voting power grew 12.5% YoY to reach 357M**. During the same year, 3,414 delegates participated in over 50% of onchain votes (6%+ YoY), reflecting a more committed and reliable governance base. This translated into a **94.4% onchain proposal pass rate**, pointing to effective proposal filtering, clearer signaling, and more efficient governance cycles. This engagement has translated into meaningful decisions shaping the network’s long-term trajectory. Over the past year, the DAO approved several initiatives that strengthened Arbitrum’s economic and technical foundations, including **Timeboost, DRIP, Watchdog, the Arbitrum Audit Program, DVP Quorum, and the ArbOS upgrades**. In total, the DAO has deployed **119.4M ARB and 8.5K ETH** across ecosystem initiatives, funding programs ranging from treasury diversification and security infrastructure to ecosystem growth and developer support. Together, these decisions have built a durable growth flywheel that produces long-term resilience and compounding network effects for the ecosystem. ## Claim Your Place in Arbitrum’s Future This anniversary is a celebration of the people who made ArbitrumDAO possible – delegates, builders, partners, contributors and community members who have collectively shaped it into a home for innovation and a foundation for a digitally sovereign nation. We thank each one of you for your contributions to this journey. The Arbitrum Foundation is introducing [**The ArbitrumDAO Third Anniversary Collective**](https://opensea.io/collection/arbitrumdao-celebrating-the-third-anniversary/?ref=blog.arbitrum.foundation)**,** a special open-edition collective available on OpenSea, to commemorate three years of progress from a scaling solution into a self-sustaining, credibly neutral onchain economy. Created by **Niki (@teddie\_boi)**, the artwork captures the spirit of coordination, decentralized governance, and long-term ambition that defines the DAO. It is both a record of what has been built together and a reminder that the future of Arbitrum will continue to be shaped by those who participate. [Mint Your ArbitrumDAO Third Anniversary Collective](https://opensea.io/collection/arbitrumdao-celebrating-the-third-anniversary/overview?ref=blog.arbitrum.foundation) ## Wrapping Up What sets Arbitrum apart is its ability to drive technological progress and institutional adoption without losing sight of its commitment to its community. Decentralized governance has been the foundation of its growth story. ArbitrumDAO stands as living proof that collective coordination can scale, powering competitive high-margin infrastructure and new onchain market economies without sacrificing the crypto’s founding ethos of openness, credible neutrality, and effective decentralization. Here’s to the next chapter and everything we’ll build together in the coming years. Arbitrum Everywhere. ### Rust Onchain: A Backend Engineer's Guide to Stylus URL: https://blog.arbitrum.foundation/rust-onchain-a-backend-engineers-guide-to-stylus/ Last updated: 2026-03-30T13:13:17.000Z Every backend has business logic that people have to trust. Credit scoring, risk evaluation, eligibility checks. Your consumers call an API, get a result, and take your word for it. The computation is a black box. If a regulator asks how a score was calculated, you pull logs. If a partner disputes a result, you re-run the query and hope the data hasn't changed. This works. It has worked for decades. But there's a growing category of applications where "trust us" isn't enough and where the computation itself needs to be independently verifiable without exposing the underlying rules. That's a problem that Web3 generally solves for applications, and Arbitrum Stylus offers a practical way forward for backend engineers. Not by asking you to learn a new language or adopt a new paradigm, but by giving you a new deployment target for the Rust you already write. ## What Stylus actually is If you write Rust, you can write a Stylus contract. You compile your code to WebAssembly, deploy it to Arbitrum (a blockchain network optimized for low-cost computation), and it runs onchain. That means every execution is publicly verifiable, deterministic, and tamper-proof without you having to build any of that infrastructure yourself. Most blockchain development requires learning Solidity, a domain-specific language built for smart contracts. Stylus skips that entirely. Your Rust code compiles to WASM and runs in a dedicated runtime alongside the existing blockchain infrastructure. You keep your language, your toolchain, and your crates. The blockchain handles the trust layer. And if you do end up working with existing smart contracts written in Solidity, your Stylus code operates right alongside them, sharing the same state and able to call each other directly. So why would you run something onchain instead of locally? Because you gain properties that no backend can offer on its own: every execution is independently auditable, the logic can't be silently changed after deployment, and your partners don't have to take your word for how a score was calculated. ![blackbox_vs_verifiable.svg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/blackbox_vs_verifiable.svg) The tradeoff used to be that onchain compute was prohibitively expensive for anything nontrivial. Stylus changes that equation, and we'll get into the numbers later. For now, the practical implication is that you can move compute-heavy logic onchain and call it from your existing services the same way you'd call any other microservice. ## The architecture: blockchain as a compute layer To make this concrete, here's a scoring engine. The architecture is standard microservices, with one twist: the scoring computation happens onchain via a Stylus contract instead of in the API server. ![scoring_engine_architecture.svg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/scoring_engine_architecture.svg) The codebase has three pieces: a Stylus contract that does the scoring, an Axum API server that owns the business rules and talks to the contract, and a shared Rust crate that defines the types both sides use. The API server is a normal Rust backend. It stores scoring rules in SQLite, accepts requests over REST, and returns results. The only difference from a typical service is that the `POST /score` endpoint doesn't compute the score locally. It sends the rules and entity data to a Stylus contract on Arbitrum and returns the contract's result. ## Same types, both sides of the chain The `shared` crate is where things get interesting. It defines the types used by both the onchain contract and the offchain API server: ```rust #![cfg_attr(not(feature = "std"), no_std)] extern crate alloc; use alloc::collections::BTreeMap; use serde::{Deserialize, Serialize}; #[derive(Debug, Clone, Serialize, Deserialize)] pub struct Entity { pub factors: BTreeMap, } #[derive(Debug, Clone, Serialize, Deserialize)] pub struct Rule { pub factor_name: String, pub weight: i64, pub threshold: i64, pub direction: Direction, pub penalty_or_bonus: i64, } ``` The crate compiles as `no_std + alloc` when the contract imports it, and with full `std` when the API server imports it. Same types, same serde derives, same validation logic. One crate, two compilation targets. ![shared_crate_compilation.svg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/shared_crate_compilation.svg) This is impossible with Solidity. If your backend is in TypeScript or Go and your contract is in Solidity, you maintain two separate type definitions and hope they stay in sync. With Stylus, the Rust compiler guarantees they match. ## The scoring contract: a pure function The Stylus contract itself is a stateless compute engine. It stores nothing onchain. It receives factor values and rule parameters as arrays, runs iterative scoring with cross-factor correlation, and returns the result. ```rust #[public] impl ScoringEngine { pub fn evaluate( &self, factors: Vec, weights: Vec, thresholds: Vec, directions: Vec, bonuses: Vec, corr_a: Vec, corr_b: Vec, corr_weights: Vec, iterations: u32, ) -> Vec { // iterative convergence scoring for iteration in 0..iters { // each pass refines the score using the previous pass as a bias for i in 0..num_rules { let weight = I40F24::from_num(weights[i]); // threshold gate + weighted fixed-point math } } // cross-factor correlation with damped oscillation for i in 0..num_corr { let interaction = norm_a * norm_b * pair_weight; for k in 1..=50 { let decay = I40F24::from_num(1) / I40F24::from_num(k); damped = damped * decay + interaction * decay; } } vec![score, tier, correlation_adjustment, iterations as i64] } } ``` A few things to notice. The `fixed` crate's `I40F24` type gives you precise weighted arithmetic without floating-point, which matters when scores need to be deterministic across every execution. The algorithm runs multiple passes over the rules (each pass refining the score using the previous result as input) and then evaluates every pair of correlated factors through a series of decay calculations. That's a lot of looping and a lot of math per call. This is standard Rust. You'd write this the same way for a local service. The only thing that makes it a smart contract is the `#[public]` attribute and the `#[storage]` / `#[entrypoint]` macros. Everything else is just your code. ## What the numbers look like Stylus contracts compile to WASM and execute at near-native speed. For compute-heavy operations, the cost savings are significant. On a blockchain, computation costs "gas," which is the unit you pay for every operation your code executes onchain. Think of it like CPU billing on a cloud provider, but per instruction. The more your code loops and calculates, the more gas it costs. To quantify this, the scoring engine repo includes an equivalent Solidity contract implementing the same algorithm, and a `/benchmark` endpoint that runs all three side by side: offchain Rust, onchain Stylus, and onchain Solidity. Solidity is a standard language for writing smart contracts. By implementing the same scoring algorithm in both Stylus and Solidity, we can compare the cost of running identical logic in each environment. In our benchmark (10 scoring factors, 10 cross-factor correlations, 50 refinement passes), Stylus used over 90% less gas than the equivalent Solidity contract for the same workload. The exact numbers will vary depending on your environment, but the relative savings are consistent: the heavier the computation, the wider the gap. This lines up with what production teams are seeing. [RedStone](https://blog.arbitrum.io/how-redstone-is-advancing-oracle-capabilities-with-stylus/?ref=blog.arbitrum.foundation), an oracle framework that feeds real-world data (prices, rates, metrics) into blockchain applications, ported their verification logic from Solidity to Stylus and published the results: The pattern is clear: storage operations cost the same on both VMs, but iterative math, weighted scoring, and any logic that loops over data is where WASM pulls ahead. You can clone the repo, run `pnpm benchmark`, and see the comparison for yourself with your own workload. ## Why this matters for production systems The value proposition isn't "blockchain makes everything better." It's narrower and more useful than that. **Auditability without exposure.** The scoring rules stay in your database. The algorithm executes onchain where anyone can verify that a given input produces a given output. You prove correctness without revealing your ruleset. **Tamper-proof computation.** Once the contract is deployed, the scoring logic cannot be silently modified. Your partners and regulators can verify that the same code is running today that was audited last quarter. **Deterministic execution.** Same inputs, same outputs, every time. No race conditions, no stale caches, no "works on my machine." The blockchain is the most opinionated compute environment you'll ever use, and for scoring and validation workloads, that's a feature. **Incremental adoption.** You don't rip out your backend. Your API stays your API. Your database stays your database. You add one component, the onchain scoring call, and gain verifiability for the logic that matters most. ## Try it yourself The full project is on GitHub: [stylus-scoring-engine](https://github.com/hummusonrails/stylus-scoring-engine?ref=blog.arbitrum.foundation). Clone it and run the whole thing in four commands: ```bash git clone https://github.com/hummusonrails/stylus-scoring-engine.git cd stylus-scoring-engine && pnpm install pnpm devnode # start local arbitrum node pnpm deploy:all # build and deploy both contracts pnpm api # start the api server pnpm benchmark # run the three-way gas comparison ``` The benchmark adds 10 scoring rules, sends a request with 10 factors and 10 cross-factor correlation pairs through 50 convergence iterations, and prints the gas cost for offchain Rust, onchain Stylus, and onchain Solidity side by side. Swap in your own scoring logic and see where the compute savings land for your workload. ## The bigger picture You don't need to become a blockchain developer to use this. The question is simpler than that: is there logic in your system where verifiable execution would be valuable? If you're building scoring systems, validation pipelines, compliance checks, or any computation where "trust me" is starting to feel insufficient, Stylus gives you a path. Write the same Rust you already write. Share types across the chain boundary. Deploy one function onchain and keep everything else exactly where it is. The barrier between your backend and the blockchain just got a lot thinner. ## Resources - [Stylus documentation](https://docs.arbitrum.io/stylus/gentle-introduction?ref=blog.arbitrum.foundation) - [Stylus SDK on crates.io](https://crates.io/crates/stylus-sdk?ref=blog.arbitrum.foundation) - [RedStone Stylus benchmarks](https://blog.arbitrum.io/how-redstone-is-advancing-oracle-capabilities-with-stylus/?ref=blog.arbitrum.foundation) ### The Arbitrum Foundation 2025 Transparency Report: The Year of Institutional Adoption URL: https://blog.arbitrum.foundation/the-arbitrum-foundation-2025-transparency-report-the-year-of-institutional-adoption/ Last updated: 2026-03-27T05:04:06.000Z 2025 marked a decisive shift for the blockchain industry as traditional finance moved beyond experimentation and began building onchain. The Arbitrum Foundation was well-positioned to support this transition by connecting financial market infrastructure to production-grade blockchain rails and a growing ecosystem of applications, establishing Arbitrum as a leading platform for institutional deployments. This work was supported through targeted builder programs, strategic funding initiatives, and operational coordination across the network. In 2025 alone, the Foundation approved **189 ecosystem deals**, backing teams across DeFi, infrastructure, and consumer applications. [Read the Full Report](https://docs.arbitrum.foundation/assets/files/ArbitrumFoundationTransparencyReport2025-3ac117dd3203dbe7bca401cf951f0c14.pdf?ref=blog.arbitrum.foundation) This shift translated into measurable growth across the ecosystem. **Robinhood** began offering tokenized securities on Arbitrum, and the value of real-world assets on the network exceeded $800 million. Stablecoin supply grew [80%](https://tokenterminal.com/explorer/projects/arbitrum/metrics/ecosystem-stablecoin-supply?interval=max&ref=blog.arbitrum.foundation) year over year, lifetime transactions crossed [2.1 billion](https://dune.com/entropy%5Fadvisors/arbitrum-one-network-overview?ref=blog.arbitrum.foundation), and more than [1,000](https://portal.arbitrum.io/projects?chains=arbitrum-one%5Farbitrum-nova%5Fapechain%5Fconverge%5Fcorn%5Fdegen%5Fdrtc-chain%5Febi-xyz%5Fedu-chain%5Fethereal%5Fevedex%5Fflynet%5Fgravity-chain%5Finjective%5Fplume%5Frari-mainnet%5Freya%5Fsanko%5Fxai%5Fxchain&subcategories=lsts%5Faction%5Fadventure%5Fcasual%5Fgamefi%5Fracing%5Frpg%5Fstrategy%5Fartificial-intelligence%5Fdepin%5Fnft-tooling%5Fdex%5Fpayments%5Fbridge%5Fanalytics%5Fdex-aggregator%5Fsocial%5Fcentralized-exchanges%5Fdefi-tool%5Fprediction-markets%5Fwallet%5Fdeveloper-tool%5Flending%5Ftoken-launcher%5Ffiat-on-ramp%5Foracle%5Fgrowth%5Fdao-tool%5Fliquidity-management%5Fnft-marketplace%5Finfra-and-tools-other%5Fstablecoin%5Fnft-collection%5Fnode-provider%5Fperpetuals%5Fsecurity-tool%5Fcrypto-taxes%5Foptions%5Frwa%5Finsurance&ref=blog.arbitrum.foundation) projects were building on Arbitrum by year-end. ### **Key Highlights from 2025** - **Institutional adoption accelerated.** Robinhood launched tokenized U.S. equities and ETFs for European customers on Arbitrum One, growing to nearly [2,000](https://dune.com/entropy%5Fadvisors/robinhood-stock-tokens?ref=blog.arbitrum.foundation) tokenized assets within six months. Major asset managers, including **Franklin Templeton, WisdomTree, and Spiko**, expanded tokenized financial products on Arbitrum, driving RWA value by 7x year over year, supported in part by the DAO-approved [STEP](https://forum.arbitrum.foundation/t/non-constitutional-stable-treasury-endowment-program-2-0/26819?ref=blog.arbitrum.foundation) initiative. - **Network activity scaled significantly.** Arbitrum surpassed 2.1 billion lifetime transactions, with the second billion processed in under twelve months. Total Value Secured (TVS) reached approximately [$20 billion](https://dune.com/entropy%5Fadvisors/arbitrum-one-network-overview?ref=blog.arbitrum.foundation), while stablecoin supply expanded significantly, peaking near $10 billion. By year-end, more than 1,000 projects were building on Arbitrum. - **The Arbitrum chain ecosystem expanded.** Over 100 Arbitrum chains were live or in development, reinforcing the platform’s dual role as both a shared liquidity environment and a modular stack for launching dedicated blockchain networks. **Robinhood Chain** became the latest addition to the ecosystem. Under the Arbitrum Chain Expansion [framework](https://docs.arbitrum.io/launch-arbitrum-chain/configure-your-chain/common/aep-fees/aep-fee-router-introduction?ref=blog.arbitrum.foundation), these chains contribute 10% of their net protocol revenue back to the ecosystem, strengthening the economic flywheel that supports long-term growth. - **Builder programs accelerated ecosystem development.** The Foundation approved 189 ecosystem deals in 2025, the majority through targeted initiatives such as Trailblazer, ArbiFuel, and the Audit Subsidy Program. Coupled with founder enablement initiatives like [Open House](https://openhouse.arbitrum.io/?ref=blog.arbitrum.foundation), these programs provide capital, infrastructure support, and security resources that help teams progress from early development to production deployment. - **Core infrastructure advanced.** Major upgrades included ArbOS releases aligned with Ethereum’s roadmap, the introduction of BoLD permissionless validation and Timeboost, new execution clients improving client diversity, and the continued rollout of Stylus, enabling smart contracts written in Rust. - **DAO governance and sustainability evolved.** The ecosystem’s economic model strengthened as new revenue streams expanded the DAO’s income sources. By year-end, the DAO generated revenue from four sources: transaction fees, Timeboost sequencing auctions, treasury management returns, and the Arbitrum Expansion Program (each operating at gross margins of 90%+). Timeboost alone returned more than [$6 million](https://dune.com/entropy%5Fadvisors/arbitrum-timeboost?ref=blog.arbitrum.foundation) to the DAO in its first year. During the same period, the DAO began experimenting with new governance structures designed to improve operational clarity and execution, while participation rose considerably. Together, these developments highlight the continued maturation of the Arbitrum ecosystem in 2025\. While Arbitrum continued to lead the L2 landscape, developments in 2025 underscored its position as a top blockchain platform in its own right, with an economic model that is both scalable and sustainable. Throughout this journey, the Arbitrum Foundation has played a pivotal role in supporting ecosystem growth, enabling institutional participation, strengthening governance infrastructure, and ensuring that the network continues to scale responsibly. As the **sixth transparency report** of the Arbitrum Foundation, this report provides a detailed overview of its work across five chapters: ecosystem growth, technical infrastructure, education and community, governance, and operations. [Read the full report here.](https://docs.arbitrum.foundation/assets/files/ArbitrumFoundationTransparencyReport2025-3ac117dd3203dbe7bca401cf951f0c14.pdf?ref=blog.arbitrum.foundation) ### Builder's Block #013: $340K Awarded at NYC Open House & Mentorship Applications Open until April 7th URL: https://blog.arbitrum.foundation/builders-block-013-340k-awarded-at-nyc-open-house-mentorship-applications-open-until-april-7th/ Last updated: 2026-03-17T13:00:17.000Z 💡 ****What's Important This Week** 🏆 $340K Awarded at ****NYC Open House** 📚 Applications for ****Mentorship** now **open to builders** đŸ–‹ïž ****Stylus SDK v0.10** is now production-ready for ****multi-contract setups.** ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Mentorship Program - Applications Open Until April 7th ![arbitrum-mentorship-program.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/mentorship-1.jpeg) Receive hands-on Mentorship from industry experts in Arbitrum's eight-week, equity-free program. Successful applicants will partake in structured sessions with dedicated Mentors, and have the opportunity to present at Demo Day in front of top-tier investors. Availability is limited to 15 early-stage teams. Applications must be submitted by April 7th. âžĄïž [Apply for the Mentorship Program](https://tally.so/r/aQdj2W?ref=blog.arbitrum.foundation) ### NYC Open House Concludes With $340K in Awards ![HC_dgQ5aMAEJXuk.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/HC_dgQ5aMAEJXuk.jpeg) A total of 88 teams shipped 55 projects over three days at Arbitrum's NYC Open House. $340K in rewards were distributed across five categories, marking a successful conclusion to the first in-person Founder House of Open House 2026. âžĄïž [Meet the Winning Teams](https://blog.arbitrum.foundation/nyc-founder-house-concludes-with-340k-in-awards-to-winning-teams/) ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### How to Structure Multi-Contract Stylus Projects Without Fighting the Toolchain The Arbitrum's new Cargo workspace support lets builders define multiple contracts in a single project, share interfaces through native Rust imports, and make type-safe, cross-contract calls with zero manual ABI encoding. âžĄïž [Read the Stylus multi-contract workspace guide](https://blog.arbitrum.foundation/structuring-multi-contract-stylus-projects-without-pain/) ### Predictability at Peak Demand: Learn How Dynamic Pricing Works ![HDE2L9faMAEmy2U.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/HDE2L9faMAEmy2U.png) Using the Jan 31 congestion event as a benchmark, the new ArbOS Dia pricing algorithm cut peak gas spikes by 98%. This data is publicly available for those want to dig in. For financial institutions, predictable fees are a top priority for preserving industry-leading customer service. âžĄïž [Learn How Dynamic Pricing Works](https://blog.arbitrum.io/predictability-at-peak-demand/?ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### EdgeX Announces EDGE Chain on Arbitrum ![edge_chain.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/edge_chain-1.jpeg) EdgeX team is announcing Edge Chain, a high-performance decentralized trading platform with deep institutional liquidity, processing billions in daily trading volume. Edge X specializes in perp swaps, spot trading of crypto and equities, as well as commodities. âžĄïž [Read More](https://blog.arbitrum.io/edgex-announces-edge-chain-on-arbitrum/?ref=blog.arbitrum.foundation) ### WalletConnect Pay Goes Live on Arbitrum ![walletpay-arbitrum.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/walletpay.png) WalletConnect Pay is live globally, with Arbitrum powering the application as its settlement layer. PSPs and merchants can now accept crypto from any WalletConnect-enabled wallet with no new operational overhead. âžĄïž [Learn about WalletConnect Pay on Arbitrum](https://x.com/WalletConnect/status/2021881193869004814?ref=blog.arbitrum.foundation) ### 0% Slippage USDC Bridge to Arbitrum You can now bridge USDC from most major chains to Arbitrum One, slippage free, thanks to Polymer Labsa and li.fi protocol, which are both live on Jumper Exchange. âžĄïž [See the Announcement](https://x.com/Polymer%5FLabs/status/2031384833843155302?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### Stylus SDK v0.10 is now production-ready for multi-contract builds The same release that introduced Cargo workspace support also shipped type-safe cross-contract call generation via #\[public\] trait interfaces. If you were waiting for Stylus to feel like a proper Rust project, this is the release for you. âžĄïž [Stylus SDK on GitHub](https://github.com/OffchainLabs/stylus-sdk-rs?ref=blog.arbitrum.foundation) ### Robinhood Chain Testnet - Build With Simulated Stock Tokens ![Screenshot 2026-03-12 at 13.41.35.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/Screenshot-2026-03-12-at-13.41.35.png) The developer faucet is now live with test ETH and simulated stock tokens (TSLA, AMZN), thanks to full EVM-compatibility, made possible by Arbitrum's underlying technology. Start building your next project for the upcoming era of tokenized assets. âžĄïž [Start building on Robinhood Chain](https://docs.robinhood.com/chain/?ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### ArbOS 60 Elara Proposal will bring 96kb Smart Contracts This proposal introduces three changes to integrate with Arbitrum One and Nova: Dynamic Pricing assigns separate prices per resource type (compute, storage, calldata, logs) instead of a single global price; the Stylus contract size limit jumps from 24 KB to 96 KB, 4x the Solidity ceiling, and a new BaseFeeManager to adjust the minimum L2 base fee between 0.01 and 0.10 gwei. âžĄïž [Read the full AIP](https://forum.arbitrum.foundation/t/constitutional-aip-arbos-60-elara/30601?ref=blog.arbitrum.foundation) ### DVP Quorum and Proposal Cancellation - Live Onchain Vote Live on Tally now. If passed, quorum shifts from total voteable supply to delegated voting power, and proposal authors gain a cancel() function during the 3-day pending window. âžĄïž [Cast your vote on Tally](https://www.tally.xyz/gov/arbitrum/proposal/112177996398925212273579485756315626637025938627124330171390356044681347897430?govId=eip155:42161:0xf07DeD9dC292157749B6Fd268E37DF6EA38395B9&ref=blog.arbitrum.foundation) ### OpCo March 2026 Update: Hiring and Operationalizing The Arbitrum OpCo posted its March update, where the focus is on hiring personnel and operationalizing the structure the established DAO. The most recent monthly DAO call was held on March 6th. âžĄïž [Read the OpCo March 2026 update](https://forum.arbitrum.foundation/t/opco-update-march-2026/30610?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #013\. Thank you for reading, and keep building. Arbitrum Everywhere. ### NYC Founder House Concludes With $340K in Awards to Winning Teams URL: https://blog.arbitrum.foundation/nyc-founder-house-concludes-with-340k-in-awards-to-winning-teams/ Last updated: 2026-03-11T14:28:44.000Z Some of the smartest builders from around the world descended on New York City the last weekend for **Arbitrum Open House: NYC Founder House,** a three-day sprint for founders to build and showcase the next generation of onchain applications. The NYC Founder House received overwhelming interest from builders, with 473 applications; 88 teamswere selected and participated in the Founder House. Over the course of the weekend, **55 projects submitted builds**, competing for $340K in prizes and grants and the opportunity to become category-defining projects within the Arbitrum ecosystem. NYC Founder House was 2026’s first in-person milestone of [Open House](https://openhouse.arbitrum.io/?ref=blog.arbitrum.foundation), Arbitrum’s global founder enablement program offering **$1.8M in total prizes** across a series of initiatives. This includes an [online buildathon](https://blog.arbitrum.foundation/open-house-nyc-buildathon-concludes-meet-the-winning-teams/) that preceded it, in-person founder houses, and a dedicated mentorship program. ### **A Weekend of Building** Over three action-packed days, the Founder House was designed to challenge founders’ business models and help teams launch MVPs onchain. Participants were equipped with technical workshops, product sessions, mentorship hours, and live pitches while enabling an intense, collaborative environment with co-builders. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/data-src-image-08f3765d-183e-43c5-bb99-e3a1aac14ae4.png) Beyond the programming, builders had direct access throughout the weekend to teams from the **Arbitrum Foundation, Offchain Labs, and ecosystem partners**, giving them the opportunity to discuss their projects, receive product and technical feedback, and refine their ideas with experienced operators. The industry's leading infrastructure providers, such as **Dune, Uniswap Labs, Robinhood Chain, Fhenix, Alchemy, LayerZero, and GMX**, led the workshops. Sessions explored topics critical to scaling modern onchain products, from user experience and interoperability to application design and go-to-market strategies. A fireside chat with **AJ Warner**, Chief Strategy Officer at Offchain Labs, walked participants through Arbitrum’s evolution and shared how programs like Open House fit into the ecosystem’s broader strategy for supporting the next generation of founders. Huge shoutout to all the sponsors and ecosystem partners – **Robinhood Chain, Fhenix, LayerZero, Alchemy, Dune, GMX, and OpenZeppelin –** whose teams contributed through workshops, mentorship, and active presence on the ground. ### **Meet The Winners** After three days of intense building and pitching, several standout teams emerged as winners across a bunch of prize categories. **First Prize at $60K:** [**Kustodia**](https://www.hackquest.io/projects/Kustodia?ref=blog.arbitrum.foundation) Crypto payments are rapidly expanding but many transactions still lack trusted safeguards. **Kustodia** introduces an escrow-style payment platform that enables users to create programmable payment agreements for high-value marketplace transactions (such as automobiles, real estate, or services) reducing fraud and increasing trust. **Second Prize of $40K:** [**Laytus**](https://www.hackquest.io/projects/Arbitrum-Open-House-NYC-Founder-House-Laytus-parlay-prediction-markets?ref=blog.arbitrum.foundation) **Laytus** is a structured prediction market protocol designed to fix a core flaw in multi-outcome positions. Traditional parlays assume full independence between outcomes, which can misprice correlated risk, leading to potential losses for investors who do not account for these correlations in their betting strategies. Laytus introduces a more accurate pricing model that helps protect liquidity providers while enabling more sophisticated prediction markets. **Third Prize of $20K:** [**EqualFi**](https://www.hackquest.io/projects/EqualFi-RobinHood?ref=blog.arbitrum.foundation) **EqualFi** is building infrastructure for tokenized real-world assets. Its flagship product, **EqualIndex**, is a permissionless index token primitive that allows anyone to create fully backed basket tokens representing bundles of assets. EqualIndex is already live on the **Robinhood Chain testnet**, where nine index tokens have been deployed - three crypto baskets and six stock-based indices. Besides the $120K for the top three spots sponsored by the Arbitrum Foundation and Robinhood Chain, an additional **$70K is parked by the Foundation to reward founders who show progress and unlock meaningful improvements** in the future. ### **Special Awards** In addition to the top three awards, two special prizes were awarded to projects building on **Robinhood Chain**, sponsored entirely by the Robinhood Chain team. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/data-src-image-d009afa5-ac31-4fca-b4db-c99d3e28a2ff.png) **Robinhood Chain Innovation Award at $50k:**[ **Bond.Credit**](https://www.hackquest.io/projects/bondcredit?ref=blog.arbitrum.foundation) Capital markets are steadily moving onchain. **Bond.Credit** is building a protocol that aggregates high-performing agents to enable capital-efficient allocation through standardized underwriting, which will help streamline the investment process and improve access to capital for various projects. **Founder in Residence Seed Funding at $100K**:[ **Tilt Protocol**](https://www.hackquest.io/projects/Tilt-Protocol?ref=blog.arbitrum.foundation) **Tilt Protocol** is developing an AI-driven management layer for tokenized real-world assets, enabling users to deploy or allocate to institutional-grade trading strategies directly on the Robinhood L2\. By replacing traditional prime brokers and operational infrastructure with autonomous smart contracts, Tilt aims to streamline institutional participation in onchain markets. ### **Honorary Mentions** Several other teams also stood out for showcasing promising ideas across payments, infrastructure, and emerging onchain financial products. These include: ‱[ Hopscotch.trade](https://www.hackquest.io/projects/Hopscotchtrade?ref=blog.arbitrum.foundation) ‱[ GridPay](https://www.hackquest.io/projects/GridPay-The-First-DePIN-Energy-Exchange-on-Arbitrum?ref=blog.arbitrum.foundation) ‱[ Pledge](https://www.hackquest.io/projects/Pledge-893XTg?ref=blog.arbitrum.foundation) ‱[ Jarvis](https://www.hackquest.io/projects/Jarvis?ref=blog.arbitrum.foundation) ‱[ ChainCraft](https://www.hackquest.io/projects/ChainCraft?ref=blog.arbitrum.foundation) ### **What’s Next** Winning teams will be invited to participate in the [**Open House Mentorship Program**](https://blog.arbitrum.foundation/introducing-the-arbitrum-mentorship-program-access-capital-and-strategic-support/) with another 100K in non-dilutive awards and receive continued guidance on product development, fundraising, go-to-market strategy, and ecosystem integration. The mentorship program is **open to all teams**, and interested builders can apply through the [mentorship program application](https://tally.so/r/aQdj2W?ref=blog.arbitrum.foundation). [Open House 2026](https://openhouse.arbitrum.io/?ref=blog.arbitrum.foundation) is just getting started. The program will soon expand to **London and Singapore** with both online and IRL activities**,** bringing the same high-energy founder environment to builders around the world. Happy building, and stay tuned! ### Builder's Block #012: Arbitrum NYC Open House Winners Announced & Mentorship Program Applications Now Open URL: https://blog.arbitrum.foundation/builders-block-012-arbitrum-nyc-open-house-winners-announced-mentorship-program-applications-now-open/ Last updated: 2026-03-05T08:54:32.000Z 💡 ****What's Important This Week** 💾 Up to ****$100K** at Arbitrum ****Mentorship Program** đŸ€– ****AI Agents** land on Arbitrum with ****Skills** and ****Identity** 🔀 ****Migrate** your Aptos and Sui dApps to ****Stylus** ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Mentorship Program — NOW OPEN ![HB8XOUWbYAAZ7Fn.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/HB8XOUWbYAAZ7Fn.jpeg) Eight-week, equity-free program with structured sessions, mentors from top ecosystem projects, and a Demo Day with investors and top venture firms. Deadline: April 7th. âžĄïž [Apply For The Mentorship](https://tally.so/r/aQdj2W?ref=blog.arbitrum.foundation) ### Robinhood Chain Testnet: 4M Transactions in One Week ![HA14jX1aAAQTVPm.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/HA14jX1aAAQTVPm.jpeg) Developers are testing tokenized equities, lending protocols, and perps in a financial-grade sandbox. Robinhood commits $1M to Open House 2026, helping to fund a new generation of ecosystem builders. Mainnet is expected to arrive later this year later this year. âžĄïž [Start building on Robinhood Chain](https://robinhood.com/chain?ref=blog.arbitrum.foundation) ### Open House NYC Buildathon Winners Announced ![IMG_4760.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/03/IMG_4760-1.png) Out of the 512 builders, three teams emerged victorious after rigorous evaluation: [Tilt Protocol](https://www.hackquest.io/es/projects/Arbitrum-Open-House-NYC-Online-Buildathon-Tilt-Protocol?ref=blog.arbitrum.foundation) \- $15,000 prize [Fangorn](https://www.hackquest.io/es/projects/Arbitrum-Open-House-NYC-Online-Buildathon-Fangorn?ref=blog.arbitrum.foundation) \- $10,000 prize [EquelFi](https://www.hackquest.io/es/projects/Arbitrum-Open-House-NYC-Online-Buildathon-EqualFi?ref=blog.arbitrum.foundation) \- $5,000 prize Congratulations to the winning teams! For those who don’t give up, keep building. You have plenty of opportunities within the Arbitrum ecosystem this year. [Read the Full Announcement](https://blog.arbitrum.foundation/open-house-nyc-buildathon-concludes-meet-the-winning-teams/) --- ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### AI and Stylus: The Builder's New Toolkit ![0226_Arbitrum_Blog_OnchainDevelopment-1.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/0226_Arbitrum_Blog_OnchainDevelopment-1-1.jpg) Accelerate your onchain development with AI thanks to a Claude Code Skill for Arbitrum dApp development. Find your path and innovate on agents with Stylus, ERC-8004 and x402. âžĄïž [Get the Claude Skill](https://blog.arbitrum.foundation/ai-and-stylus-the-builders-new-toolkit/) ### More Resources to build AI Agents on Arbitrum - ERC-8004 reputation, discoverability, and trust for AI agents are live on Arbitrum One and Sepolia. âžĄïž [ERC-8004 Tutorial](https://youtu.be/nZH2cd2VbSA?ref=blog.arbitrum.foundation) - x402 machine-to-machine payments with automatic USDC batch settlement, built on Arbitrum. âžĄïž [x402 Tutorial](https://blog.arbitrum.foundation/x402-payments-on-arbitrum/) ### Move Smart Contracts are now live on Arbitrum Move smart contracts run on Stylus via the Move-to-WASM compiler, alongside Rust, C, and C++. Aptos and Sui devs: your skills transfer directly. We prepared an episode with Rather Labs to know what it unlocks for builders. âžĄïž [Watch the episode](https://x.com/cripto%5Fnita%5F/status/2025934923287461913?ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### Carbon Perp DEX Migrates from Base → Arbitrum ![HAPs5TlXUAEnbkq.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/HAPs5TlXUAEnbkq-1.jpeg) Carbon moved for one reason: Arbitrum's 250ms blocks. Carbon Solver, CLP, and the Momentum Program are all launching on Arbitrum. âžĄïž [Read the article](https://x.com/CarbonTerminal/status/2018754489008746926?ref=blog.arbitrum.foundation) ### USD.AI: AI Infra Financing on Arbitrum USD.AI have crossed another milestone, amassing a combined market cap of more than $650M. The protocol finances GPU-backed AI infrastructure through tokenized credit, with PayPal's PYUSD integrated as a reserve asset. âžĄïž [Explore USD.AI](https://www.youtube.com/watch?v=e2ue4XM%5FYiE&ref=blog.arbitrum.foundation) ### Timeboost Hits $6.74M in Cumulative Fees $6.74M in real fees from blockspace demand. 97% to Arbitrum DAO, 3% to the developer guild. For HFT builders: the express lane auction runs every 60 seconds. âžĄïž [Learn about Timeboost](https://docs.arbitrum.io/how-arbitrum-works/timeboost/gentle-introduction?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### Nethermind's Execution Arbitrum Client is Now Public ![HB6sNbAWcAALmeO.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/HB6sNbAWcAALmeO.jpeg) Where it stands: full node execution processing over 300M Arbitrum One archive blocks, with Stylus smart contract support. âžĄïž [Open-Sourced in GitHub](http://github.com/NethermindEth/nethermind-arbitrum?ref=blog.arbitrum.foundation) ### Robinhood Chain Oracle Integration Chainlink is live as Robinhood Chain's oracle provider. Builders can leverage Chainlink’s data, interoperability, and compliance standards to power advanced tokenization use cases. âžĄïž [Check the announcement](https://x.com/chainlink/status/2021399623563178207?ref=blog.arbitrum.foundation) ### Increasing the Smart Contract Size Coming to Arbitrum Contributors and developers share their opinions and proposals at the Arbitrum DAO forum, and requests are taken into consideration. From idea to reality, 96kb contracts coming to Arbitrum soon. Cudos to contributor @CupOJoseph. âžĄïž [Check the forum proposal](https://forum.arbitrum.foundation/t/implement-an-enhanced-version-of-eip-7954-on-arbitrum-to-raise-contract-the-size-limit-to-at-least-64kb/30428?ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### Open House NYC Founder House - March 6th, 2026 In-person Founder House for top buildathon teams. Build alongside mentors, get direct feedback, and pitch for funding. âžĄïž [Apply for Open House NYC](https://luma.com/openhouse-newyork?ref=blog.arbitrum.foundation) ### Fhenix & Arbitrum Cocktail Party in NYC ![1cf7f2b1-0ce4-4b07-bd71-6adbf620b738.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/1cf7f2b1-0ce4-4b07-bd71-6adbf620b738.jpg) Join Fhenix and Arbitrum for an exclusive happy hour to kick off the Arbitrum Open House in NYC. If you're building with FHE, confidential compute, or privacy on L2, this is your room. âžĄïž [Register now](https://luma.com/lo5xl7nf?ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### DVP Quorum & Proposal Cancellation is Heading to an Onchain Vote The initial temperature check has passed, and the quorum has shifted from total voteable supply, to delegated voting power (DVP), followed by an onchain proposal cancellation. âžĄïž [Read the proposal](https://forum.arbitrum.foundation/t/24-february-2026-roundup-of-active-upcoming-votes/30578?ref=blog.arbitrum.foundation) ### Steven Goldfeder, CEO at Offchain Labs Features in Arbitrum Everywhere Series. In the third episode of our Arbitrum Everywhere series, Steven Goldfeder, CEO at Offchain Labs, discusses how Arbitrum is emerging as the trusted independent platform that institutions such as Robinhood rely upon for long-term, scalable growth. âžĄïž [Watch here](https://x.com/arbitrum/status/2026428835978166519?ref=blog.arbitrum.foundation) ### Introducing ChainCraft: an AI-powered Game Creation Following the completion of a successful Questbook grant, ChainCraft is emerging as an AI-powered platform where anyone can create, play, and own multiplayer games through conversations on Arbitrum. âžĄïž [Read the final report](https://forum.arbitrum.foundation/t/final-report-chaincraft-ai-powered-game-creation/30581?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #012\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Structuring Multi-Contract Stylus Projects Without Pain URL: https://blog.arbitrum.foundation/structuring-multi-contract-stylus-projects-without-pain/ Last updated: 2026-03-04T12:50:39.000Z If you've tried building a multi-contract Stylus project before v0.10, you know what it felt like. Each contract lived in its own isolated Cargo project. Sharing types between them meant copy-pasting. Cross-contract calls meant hand-rolling raw ABI encoding. Coordinating deployments meant juggling separate build directories and hoping nothing drifted out of sync. It worked, technically. But it didn't feel like building a real application. It felt like fighting the toolchain. Stylus SDK v0.10 changes that. You can now define multiple Stylus contracts in a single Cargo workspace, share interfaces between them through normal Rust imports, and make type-safe cross-contract calls without writing a single line of ABI encoding. This is how multi-contract development should work, and it's how Rust developers already expect it to work. Let's walk through the feature using a full-stack voting dApp with two contracts: a voter registry and a polls manager. Simple enough to follow, complex enough to show why workspaces matter. ## The workspace layout A Stylus multi-contract workspace looks like any Cargo workspace with two additions: a root `Stylus.toml` marking the workspace, and a per-contract `Stylus.toml` marking each deployable contract. ``` voting-dapp/ Cargo.toml # workspace root Stylus.toml # [workspace] marker contracts/ voter-registry/ Cargo.toml Stylus.toml # [contract] marker src/lib.rs polls/ Cargo.toml Stylus.toml # [contract] marker src/lib.rs ``` The root `Cargo.toml` defines the workspace members and a shared release profile optimized for onchain size: ```toml [workspace] members = [ "contracts/voter-registry", "contracts/polls", ] resolver = "2" [profile.release] codegen-units = 1 strip = true lto = true panic = "abort" opt-level = "z" ``` Every setting in that release profile matters. `opt-level = "z"` optimizes aggressively for binary size. `lto = true` enables link-time optimization across crate boundaries. Together, they keep your WASM binaries small enough to deploy onchain. The `Stylus.toml` files are minimal. The root contains `[workspace]`. Each contract contains `[contract]`. That's it. The tooling uses these to distinguish deployable contracts from shared library crates in the same workspace. ## Defining a cross-contract interface The voter registry contract manages who can vote. The polls contract needs to check registration status before accepting a vote. In v0.10, you define that interface as a Rust trait. ```rust #[public] pub trait IVoterRegistry { fn is_registered(&self, voter: Address) -> bool; fn voter_count(&self) -> U256; } ``` The `#[public]` attribute on the trait does two things. During a normal build, it generates Solidity-compatible function selectors and router dispatch for any struct that implements it. But when the `contract-client-gen` feature is active (more on that in a moment), it generates a type-safe client that can call those functions on a deployed contract through standard EVM calls. The voter registry implements this trait alongside its own methods: ```rust #[public] #[implements(IVoterRegistry)] impl VoterRegistry { pub fn register(&mut self) -> Result<(), RegistryError> { let voter = self.vm().msg_sender(); if self.registered_voters.get(voter) { return Err(RegistryError::AlreadyRegistered(AlreadyRegistered { voter })); } self.registered_voters.setter(voter).set(true); let count = self.voter_count.get(); self.voter_count.set(count + U256::from(1)); self.vm().log(VoterRegistered { voter }); Ok(()) } // ... } #[public] impl IVoterRegistry for VoterRegistry { fn is_registered(&self, voter: Address) -> bool { self.registered_voters.get(voter) } fn voter_count(&self) -> U256 { self.voter_count.get() } } ``` Notice three `#[public]` attributes: one on the trait definition, one on the main impl block, and one on the trait implementation. The `#[implements(IVoterRegistry)]` attribute on the main impl block wires the trait's function selectors into the contract's router so both sets of methods are callable. ## The feature flag that makes it all work The voter registry's `Cargo.toml` declares an empty feature: ```toml [features] contract-client-gen = [] ``` This feature is never enabled when building the voter registry for deployment. It exists solely for consumers. The polls contract depends on voter-registry with this feature turned on: ```toml [dependencies] voter-registry = { path = "../voter-registry", features = ["contract-client-gen"] } ``` When `contract-client-gen` is active, the SDK's proc macros produce a completely different version of the voter registry crate. The storage fields are erased. The entrypoint is removed. The `#[public]` methods are replaced with client stubs that ABI-encode arguments and make external calls. The `VoterRegistry` struct becomes a lightweight proxy that holds only an address. From the polls contract's perspective, the import looks like normal Rust: ```rust use voter_registry::{VoterRegistry, IVoterRegistry}; ``` But what you get is an auto-generated client, not the full contract. ## Making the cross-contract call Inside the polls contract's `vote` function, calling the registry is three lines: ```rust let registry = VoterRegistry::new(registry_addr); let is_registered: bool = registry .is_registered(self.vm(), Call::new(), voter) .expect("Cross-contract call to VoterRegistry failed"); ``` `VoterRegistry::new(registry_addr)` creates a client pointing at the deployed voter registry. The `.is_registered()` call encodes the function selector and arguments, makes a `static_call` (because the original method takes `&self`, not `&mut self`), and ABI-decodes the return value. The two extra parameters are the v0.10 calling convention. `self.vm()` provides the host context. `Call::new()` configures the call type. For view functions (`&self`), use `Call::new()`. For state-changing functions (`&mut self`), use `Call::new_mutating(self)`. The SDK picks `static_call` or `call` based on this context automatically. No hand-rolled selectors. No `abi.encodeWithSignature`. Just Rust method calls with type checking at compile time. ## Deploying and linking Deployment order matters. The voter registry has no dependencies, so it deploys first. The polls contract needs to know the registry's address after deployment. ```bash # Deploy voter registry cargo stylus deploy --wasm-file=target/.../voter_registry.wasm \ --endpoint=$RPC_URL --private-key=$PRIVATE_KEY # Deploy polls cargo stylus deploy --wasm-file=target/.../polls.wasm \ --endpoint=$RPC_URL --private-key=$PRIVATE_KEY # Link them cast send $POLLS_ADDRESS "setRegistry(address)" $VOTER_REGISTRY_ADDRESS \ --rpc-url $RPC_URL --private-key $PRIVATE_KEY ``` The `setRegistry` call stores the voter registry address inside the polls contract and sets the caller as the owner. After this, any call to `polls.vote()` triggers the cross-contract call to the registry automatically. ## Testing in a workspace Unit tests run per-crate with the Stylus test harness. The voter registry tests use a `TestVM` to simulate the EVM environment: ```rust #[cfg(all(test, not(feature = "contract-client-gen")))] mod tests { use super::*; use stylus_sdk::testing::*; #[test] fn test_register_voter() { let vm = TestVM::default(); let mut contract = VoterRegistry::from(&vm); assert!(contract.register().is_ok()); assert!(contract.is_registered(vm.msg_sender())); assert_eq!(U256::from(1), contract.voter_count()); } } ``` Notice the `#[cfg(all(test, not(feature = "contract-client-gen")))]` guard. When `contract-client-gen` is active, storage types and the entrypoint don't exist, so tests wouldn't compile. This guard ensures tests only run during a normal build. Cross-contract calls can't be unit tested locally because they need a real EVM runtime. For that, deploy to a local Arbitrum devnode and run integration tests against live contracts. ## Connecting a frontend The contracts expose standard Solidity ABIs, so any Ethereum frontend stack works. The companion project uses Next.js with wagmi and viem. The cross-contract interaction is invisible to the frontend. It calls `polls.vote()` like any other contract method, and the registry check happens onchain: ```typescript const { writeContract } = useWriteContract(); writeContract({ address: pollsAddress, abi: pollsAbi, functionName: "vote", args: [pollId, true], }); ``` The user doesn't need to interact with the voter registry directly to vote. They register once, and every subsequent `vote` call validates their status through the cross-contract call behind the scenes. ## Try it yourself The full project, both contracts, deployment scripts, and a Next.js frontend, is on GitHub: [github.com/hummusonrails/arbitrum-stylus-multi-contract-example](https://github.com/hummusonrails/arbitrum-stylus-multi-contract-example?ref=blog.arbitrum.foundation) Clone it, spin up a local Arbitrum devnode, and run the deploy script. You'll have two linked Stylus contracts and a working frontend in a few minutes. ## Workspaces are how real applications get built Single-contract projects are fine for learning. But production dApps almost always involve multiple contracts that share types, reference each other, and deploy together. Stylus SDK v0.10 brings that pattern to Rust with the same workspace model Cargo developers already use for non-blockchain projects. The tooling is still young. Feature unification requires careful build ordering, and cross-contract integration tests need a running node. But the core workflow, defining interfaces as traits, importing generated clients, and making type-safe calls, is solid. It means you can structure a Stylus project the way you'd structure any Rust project and focus on your application logic instead of fighting the build system. ## Resources - [Stylus SDK v0.10.0 Release Notes](https://github.com/OffchainLabs/stylus-sdk-rs/releases/tag/v0.10.0?ref=blog.arbitrum.foundation) - [Stylus Rust SDK Guide](https://docs.arbitrum.io/stylus/reference/rust-sdk-guide?ref=blog.arbitrum.foundation) - [Stylus Quickstart](https://docs.arbitrum.io/stylus/quickstart?ref=blog.arbitrum.foundation) - [Companion Repository](https://github.com/hummusonrails/arbitrum-stylus-multi-contract-example?ref=blog.arbitrum.foundation) ### Open House NYC Buildathon Concludes: Meet The Winning Teams URL: https://blog.arbitrum.foundation/open-house-nyc-buildathon-concludes-meet-the-winning-teams/ Last updated: 2026-03-06T03:12:14.000Z A total of 512 builders from more than 40 countries participated in Arbitrum’s Open House NYC Online Buildathon, which ran for three weeks from February 5 to 26. At the beginning of the program, our team set the tone for what it means to build a successful project within the Arbitrum ecosystem. This included hands-on workshops aimed at equipping participating teams with the technical knowledge to build on Arbitrum, as well as founder-focused education around product execution and go-to-market strategy. ### **Arbitrum’s Open House Buildathon Winners** Out of the 512 builders, three teams emerged victorious after rigorous evaluation that was based on technical execution, product clarity, ecosystem alignment, and the long-term potential of the project. Congratulations to the following projects: 1. [Tilt Protocol](https://www.hackquest.io/projects/Arbitrum-Open-House-NYC-Online-Buildathon-Tilt-Protocol?ref=blog.arbitrum.foundation) \- $15,000 prize 2. [Fangorn](https://www.hackquest.io/projects/Arbitrum-Open-House-NYC-Online-Buildathon-Fangorn?ref=blog.arbitrum.foundation) \- $10,000 prize 3. [EqualFi](https://www.hackquest.io/projects/Arbitrum-Open-House-NYC-Online-Buildathon-EqualFi?ref=blog.arbitrum.foundation) \- $5,000 prize Each of these winning teams demonstrated clear user focus, promising architecture, and a clear and concise roadmap that extends beyond our Buildathon and into the future. We would also like to thank our ecosystem partners who share our commitment to uplifting grassroots builders by supporting the Open House initiative. **Thank you to Robinhood Chain, Layer Zero, Open Zeppelin, Alchemy, GMX, Fhenix, and Dune.** ### **Beyond The Buildathon: Arbitrum Founder House NYC + Mentorship** The **Arbitrum Founder House** is the next phase of Open House NYC, running from **March 6 to 8, 2026**, serving as a platform for promising early-stage teams to build on the success of the Buildathon. Selected teams will be gathered to participate in dual-track mentorship, with a heavy focus on deep technical support and understanding, followed by effective GTM strategies that have a proven track record. The Arbitrum Founder House will also be offering up to **$340,000 in prizes** and grants to the most outstanding teams. To extend this momentum and help early-stage teams evolve into category-defining projects on Arbitrum, we are committed to guiding and mentoring through the upcoming [**Mentorship Program**](https://tally.so/r/aQdj2W?ref=blog.arbitrum.foundation). This initiative will equip participating teams with effective strategies to help them excel in product development, GTM, organic community building, and fundraising. Beyond NYC, Open House will continue to expand across the globe, including Dubai, London, and Singapore in 2026\. If you are building something novel and are looking for the right environment to accelerate your idea, Arbitrum’s doors are always open. ### Introducing the Arbitrum Mentorship Program: Access, Capital, and Strategic Support URL: https://blog.arbitrum.foundation/introducing-the-arbitrum-mentorship-program-access-capital-and-strategic-support/ Last updated: 2026-02-24T15:44:57.000Z As the ecosystem continues to expand, the Arbitrum Foundation is doubling down on teams building category-leading applications on Arbitrum chains, such as **Arbitrum One and Robinhood Chain**. Today, the Foundation is opening applications for its **Mentorship Program**, a highly selective initiative designed to support up to 15 teams. Applications close on April 7, 2026, with the program kicking off on April 13, 2026\. Selected teams will receive hands-on guidance on product development and growth strategies, alongside direct ecosystem distribution support and curated investor introductions. The program is designed to turn strong builders into breakout successes on Arbitrum. Participating builders will be paired with a dedicated mentor and supported through structured sessions and periodic check-ins throughout the program. Teams will collaborate closely with leading ecosystem teams, such as **Variational, Pendle, Fhenix, GMX, and Robinhood Chain**. Builders will also have access to curated sessions and introductions to top-tier venture partners, such as **Pantera Capital, Electric Capital, Lightspeed, Tandem\* by Offchain Labs, IOSG, and more.** In addition, close partners and leading infrastructure providers at **Alchemy, Dune, OpenZeppelin, and LayerZero** will mentor builders directly. While participation does not guarantee investment or commercial partnerships, this level of access is designed to give builders meaningful exposure to both best-in-class operators and investors, helping teams move from early prototype to live applications on Arbitrum. [Apply Now To Join The Mentorship Program ](https://tally.so/r/aQdj2W?ref=blog.arbitrum.foundation) ### **Mentorship Program Structure** The Arbitrum Mentorship Program is an **eight-week** **equity-free program starting on April 13, 2026**. To help teams move from prototype to Arbitrum launch, mentors will run workshops focusing on go-to-market strategy, partnerships, fundraising readiness, and product execution, among other things. Each session focuses on delivering actionable insights from top operators, enabling teams to move from theory to shipped product with clarity and confidence. The program concludes with a **Demo Day**, where teams present to leading investors and ecosystem partners. The top three teams will receive **$100K in non-dilutive awards**, recognizing standout execution and progress ### **Who can apply?** Applications are open to **early-stage builders at MVP, pre-seed, or seed stages**. Founders must build or commit to build on Arbitrum. If you want to increase your chances of being selected, you should demonstrate: - A working prototype or early product - Full-time commitment to build - Mindset to become a top Arbitrum-native protocol The winners of the Open House NYC Buildathon and Founder House will also be invited to participate. [Apply now to the NYC Founder House ](https://arbitrum-nyc.hackquest.io/?utm%5Fsource=website&utm%5Fmedium=website&utm%5Fcampaign=oh-nyc-buildathon,oh-nyc-founder-house&utm%5Fcontent=oin-open-house-nyc-header-link) ### **Collaborate with us for future programs** Are you an infra provider, investor, ecosystem team, ArbitrumDAO contributor, or mentor willing to support the next generation of Arbitrum builders? Submit your information [here](https://tally.so/r/5Bz9Ab?ref=blog.arbitrum.foundation). Please read the [full terms and conditions here](https://docs.google.com/document/d/1i8Il0NMII-qs5kBISWZoUtfue%5FB5s-wKq5TKtIKFlvQ/preview?ref=blog.arbitrum.foundation). \*Tandem is a partner studio owned and operated by Offchain Labs, and Offchain Labs has various commercial arrangements with The Arbitrum Foundation. ### AI and Stylus: The Builder's New Toolkit URL: https://blog.arbitrum.foundation/ai-and-stylus-the-builders-new-toolkit/ Last updated: 2026-02-20T09:12:51.000Z If you write Rust, C, or C++ and you've looked at smart contract development, you've probably felt the friction. Solidity is its own world. The tooling is unfamiliar. The patterns don't transfer cleanly. And even if you've gotten comfortable with Stylus, which lets you write contracts in these languages and compile them to WASM, you still need to learn the Arbitrum-specific details: fee models, contract activation, devnode setup, cross-contract calls between Solidity and Rust. That's a lot of context to carry. And it's exactly the kind of context that AI tools are getting good at holding for you. ## AI that knows the stack Large language models are effective at generating boilerplate, explaining patterns, and scaffolding projects. But they struggle when the domain is new or niche. Ask a general-purpose LLM to write a Stylus contract and you'll likely get something that looks reasonable but misses the details that matter. SDK v0.10 introduced cross-contract calls through `#[public]` traits with the `contract-client-gen` feature flag, and Cargo workspace support with `Stylus.toml` markers. An LLM without that context will either generate code against an older SDK version or invent patterns that don't exist. The fix isn't better prompting. It's better context. That's the idea behind a recently released [Claude Code skill for Arbitrum dApp development](https://github.com/hummusonrails/arbitrum-dapp-skill?ref=blog.arbitrum.foundation). It's a set of structured reference files that load into Claude's context when you're working on an Arbitrum project. The skill encodes the full development workflow: Stylus contracts in Rust, Solidity contracts via Foundry, React frontends with viem and wagmi, and a local Docker-based devnode for testing. The result is opinionated and intentional. It uses pnpm, Foundry, and Viem. That opinionation matters because LLMs produce dramatically more consistent output when you eliminate ambiguous tool choices. Instead of generating five slightly different project structures, the AI follows a single well-defined path. You install it with one command and your AI assistant can scaffold a complete monorepo, write Stylus contracts that compile correctly, set up cross-language interop between Solidity and Rust, and configure a local devnode with pre-funded accounts. ## Beyond scaffolding: AI that builds with you Scaffolding is the starting point, not the ceiling. Once your AI tooling understands the Stylus SDK, it can help you through the entire development cycle. Need to add a new entry point to your Stylus contract? The AI knows the `#[entrypoint]` macro pattern. Want to call your Rust contract from a Solidity contract? It can generate the interface on both sides. Debugging a failed deployment? It can check whether you've activated the contract and whether your Wasm binary is within size limits. This matters because Stylus development is inherently multi-language. A typical project might have Rust contracts for compute-heavy logic, Solidity contracts for standard interfaces, and a TypeScript frontend tying it all together. Keeping the patterns consistent across three languages and two VMs is exactly where AI comes in handy. It holds the context you'd otherwise lose switching between files and toolchains. ## Stylus as the execution layer for AI workloads The story has a second side. AI isn't just helping developers build on Stylus. Stylus is becoming a natural fit for AI-related workloads onchain. The reason is compute efficiency. Wasm contracts on Stylus run at near-native speed and cost significantly less gas than equivalent EVM operations for compute-heavy tasks. This isn't theoretical. [RedStone](https://blog.arbitrum.foundation/how-wasm-elevates-performance-without-leaving-the-evm/), the modular oracle framework used across DeFi, ported their verification logic to Stylus and reported a 50% reduction in per-feed computation and a 34% reduction in base overhead compared to their EVM implementation. Their workload, cryptographic verification of aggregated price feeds, is both compute-heavy and latency-sensitive. Exactly the profile that AI workloads share. | Metric | EVM | Stylus | Improvement | | --------------------------- | --- | ------ | ------------------- | | Base computational overhead | 35k | 23k | **34.3% reduction** | | Per-feed computation | 16k | 8k | **50.0% reduction** | That kind of headroom opens the door to onchain logic that would be impractical in Solidity: reputation scoring algorithms, proof verification, complex registry operations, and data-intensive validation. You can see this playing out across the ecosystem right now. **[ERC-8004](https://blog.arbitrum.foundation/ai-on-arbitrum-establishing-an-agent-registry-with-erc-8004-2/)**, the standard for onchain AI agent identity, [went live on Arbitrum on February 5th](https://x.com/arbitrum/status/2019425576759730514?ref=blog.arbitrum.foundation). It defines registries for agent identity, reputation, and validation. The reputation registry in particular benefits from Stylus: algorithms that score agent reliability across a network involve iterative computation that's expensive in the EVM but feasible in Wasm. The [identity registry is live on Arbitrum One](https://arbiscan.io/token/0x8004a169fb4a3325136eb29fa0ceb6d2e539a432?ref=blog.arbitrum.foundation) and processing real transactions. If you want to experiment before touching mainnet, the contracts are also deployed on Arbitrum Sepolia so you can register an agent and explore the registry yourself. ![Agent registered on Arbitrum Sepolia](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/Screenshot-2026-02-10-at-19.00.49.png) **x402**, the protocol that gives HTTP's `402 Payment Required` status code an actual job, can be [built and demonstrated on Arbitrum](https://github.com/hummusonrails/x402-demo-arbitrum?ref=blog.arbitrum.foundation). It enables AI agents to pay for API access and settle payments onchain without human intervention at each transaction. The demo includes metered AI inference with automatic batch settlement in USDC, showing what autonomous agent commerce looks like in practice. Neither of these projects are unique to Stylus. But both benefit from what Stylus makes possible: cheaper computation, efficient data handling, and the ability to run complex logic onchain without hitting gas ceilings. ## The feedback loop Here's what's interesting about this moment. AI tools are making it easier to write Stylus contracts. And Stylus is making it practical to build AI infrastructure onchain. Each side accelerates the other. A developer who's never written a Stylus contract can install an AI skill and have a working project in minutes. That same project might include a contract that registers an AI agent onchain, or processes payments for an AI service, or verifies the output of an inference model. The tools that help you build are also the tools you're building for. This feedback loop is still early. The Claude Code skill covers the core development workflow, but it'll expand as the Stylus SDK matures and new patterns emerge. ERC-8004 is live but the ecosystem of registered agents is just starting to grow. x402 is demonstrating what's possible but it's up to builders to take the concept and run with it. ## Try it yourself If you want to see what AI-assisted Stylus development feels like: - **[Arbitrum dApp Skill for Claude Code](https://github.com/hummusonrails/arbitrum-dapp-skill?ref=blog.arbitrum.foundation)**: Install the skill and let your AI assistant scaffold a full Stylus + Solidity + React project. - **[ERC-8004 on Arbitrum](https://blog.arbitrum.foundation/ai-on-arbitrum-establishing-an-agent-registry-with-erc-8004-2/)**: Read the deep dive on agent registries, or explore the [live contract on Arbiscan](https://sepolia.arbiscan.io/address/0x8004A818BFB912233c491871b3d84c89A494BD9e?ref=blog.arbitrum.foundation). - **[x402 Demo on Arbitrum](https://github.com/hummusonrails/x402-demo-arbitrum?ref=blog.arbitrum.foundation)**: A full-stack demo of machine-to-machine payments with a custom facilitator on Arbitrum. - **[Stylus documentation](https://docs.arbitrum.io/stylus/gentle-introduction?ref=blog.arbitrum.foundation)**: The official guide to writing WASM contracts on Arbitrum. The intersection of AI and smart contract development is usually framed as a future thing. On Arbitrum, builders are already working in that intersection. The tools exist, the infrastructure is live, and the contracts are deployed. What gets built next depends on who shows up. ### Builder's Block #011: Robinhood Chain Launches Testnet & Commits $1M to Builders URL: https://blog.arbitrum.foundation/builders-block-011-robinhood-chain-launches-testnet-commits-1m-to-builders/ Last updated: 2026-02-17T12:04:32.000Z 💡 ****What's Important This Week** 🍀 ****Robinhood Testne**t is here & ****1M** in prizes at ****Open House** 📈 How ****Dynamic Pricing** managed ****Peak** TPS ⚙ ****Move** and ****Foundry** came to ****Stylus** ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Robinhood Chain Testnet now live ![Y88QDZYr.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/Y88QDZYr.png) Developers can now build on a financial-grade Ethereum Layer 2 built on Arbitrum — designed to support tokenized real-world and digital assets. âžĄïž [Start building now](https://docs.robinhood.com/chain/?ref=blog.arbitrum.foundation) ### Robinhood Chain to support Open House 2026 with up to $1M in prizes Robinhood Chain is supporting the Arbitrum Open House 2026 with $1 million in prizes for builders, backing teams building on the Robinhood Chain testnet, across New York, London, Singapore, and Dubai. âžĄïž [Apply for Open House NYC](https://luma.com/openhouse-newyork?ref=blog.arbitrum.foundation) ### ERC-8004 is now enabled on Arbitrum [![HAZw3FWacAk-JAg.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/HAZw3FWacAk-JAg.jpg)](https://www.8004.org/build?ref=blog.arbitrum.foundation) AI agents now get Onchain identity. Verifiable reputation & Cross-platform discovery. Paired with Arbitrum's deep liquidity and credibly neutral platform, builders can ship trustless AI agents and grow the open agentic economy. âžĄïž [Build with ERC-8004 on Arbitrum](https://www.8004.org/build?ref=blog.arbitrum.foundation) ### Dive into the Dynamic Pricing roadmap [![HAbCqzIaYAANC6O.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/HAbCqzIaYAANC6O.jpg)](https://blog.arbitrum.io/dynamic-pricing-update-2026/?ref=blog.arbitrum.foundation) ArbOS Dia was just the beginning. While it brought smoother fees to Arbitrum One, its deeper purpose was laying the foundation for Dynamic Pricing. The platform is moving toward a system where fees aren't just a single number, but a reflection of real resource demand. âžĄïž [Discover the roadmap](https://blog.arbitrum.io/dynamic-pricing-update-2026/?ref=blog.arbitrum.foundation) ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### Build end-to-end Arbitrum dApps with ClaudeAI skill [![Screenshot 2026-02-13 at 11-57-58 Build a dApp on Arbitrum with Claude - YouTube.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/Screenshot-2026-02-13-at-11-57-58-Build-a-dApp-on-Arbitrum-with-Claude---YouTube.png)](https://www.youtube.com/watch?v=vsejiaOTmJA&feature=youtu.be&ref=blog.arbitrum.foundation) Finally, an AI that actually understands the Arbitrum stack! Go from Idea → working code → deployed. âžĄïž [Watch the 8 minute guide](https://www.youtube.com/watch?v=vsejiaOTmJA&feature=youtu.be&ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### Ecosystem Spotlight: January Highlights [![HAzkqTubAAAXE3R.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/HAzkqTubAAAXE3R.jpg)](https://x.com/arbitrum/status/2021242138646778296?ref=blog.arbitrum.foundation) âžĄïž [Dive into the highlights](https://x.com/arbitrum/status/2021242138646778296?ref=blog.arbitrum.foundation) ### Hyungji, one of Korea's largest fashion retail groups, is bringing stablecoin payments to stores via Arbitrum [![HA_Qcg_bsAETUSN.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/HA_Qcg_bsAETUSN.jpg)](https://en.bloomingbit.io/feed/news/105962?ref=blog.arbitrum.foundation) Serving millions across 2K+ locations in Asia requires fast, low-cost, reliable rails and Arbitrum is the neutral settlement layer powering retail payments across Asia. âžĄïž [Read the news release](https://en.bloomingbit.io/feed/news/105962?ref=blog.arbitrum.foundation) ### Quick 5-min breakdown of EIP-7702 - from EOAs vs Smart Accounts to why this matters for UX, plus a live demo on Arbitrum If you've been curious about EIP-7702, here's the shortcut you don't want to miss. A video by the Ethereum Foundation's Founder Success Manager, Abbas Khan. âžĄïž [Watch the video](https://x.com/KhanAbbas201/status/1970412827291632020?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### Move is now live on Arbitrum [![Screenshot 2026-02-13 at 11-50-38 Welcome Move to Arbitrum Rather Labs.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/Screenshot-2026-02-13-at-11-50-38-Welcome-Move-to-Arbitrum-Rather-Labs-1.png)](https://www.ratherlabs.com/blog/welcome-move-to-arbitrum?ref=blog.arbitrum.foundation) Move smart contracts can now run on Stylus via the Move-to-WASM compiler - alongside Rust, C, & C++. New languages, new primitives, new design space for Move devs on Arbitrum. âžĄïž [Build with Move now](https://www.ratherlabs.com/blog/welcome-move-to-arbitrum?ref=blog.arbitrum.foundation) ### WakeUpLabs Stylus libraries are now part of the official Stylus SDK This pushes AssemblyScript adoption forward and helps grow the developer ecosystem on Arbitrum. âžĄïž [Check out the SDK](https://github.com/OffchainLabs/stylus-sdk-rs/blob/main/README.md?ref=blog.arbitrum.foundation) ### Introducing arbos-foundry – a fork of Foundry that brings native support for testing Stylus programs [![HAybcOsaAAIWven.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/HAybcOsaAAIWven.png)](https://iosiro.com/blog/introducing-arbos-foundry-native-stylus-testing-with-foundry?ref=blog.arbitrum.foundation) With arbos-foundry, you can now run arbos-forge test to execute Stylus WASM programs natively. No network forks or external dependencies, just fast local testing. âžĄïž [Use arbos-foundry now](https://iosiro.com/blog/introducing-arbos-foundry-native-stylus-testing-with-foundry?ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### Arbitrum goes to ETHDenver with Open House Gather [![HAycWzRawAAtoTl.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/02/HAycWzRawAAtoTl.jpg)](https://luma.com/openhousegather-denver?ref=blog.arbitrum.foundation) Join us alongside Alchemy on Feb 18th during ETHDenver at Shake Shack, and hang out with founders and builders from the Arbitrum ecosystem. Stick around for a 5-min hacking challenge (Winner gets an all-paid trip to our NYC Founder House this March!) âžĄïž [Sign up](https://luma.com/openhousegather-denver?ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### DVP Quorum for ArbitrumDAO - Temperature Check passed This proposal aims to finalize the final parameters for upgrading ArbitrumDAO's quorum computation logic to be based on delegated voting power (DVP). âžĄïž [Read the proposal](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth/proposal/0x3ac48360cb2cf6f921e391a97416a53c8ca442e3a621a9f7bb406719a8f8034d) --- That’s all from Builder’s Block #011\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Builder's Block #010: OpenHouse NYC Kicks off Feb 5th - Get to Know our Sponsors URL: https://blog.arbitrum.foundation/builders-block-010-openhouse-nyc-kicks-off-feb-5th-get-to-know-our-sponsors/ Last updated: 2026-02-03T13:00:40.000Z 💡 ****What's Important This Week** 💾 OpenHouse **NYC Sponsors** Announced đŸ€– ****Nethermind** ****Client** synced with ****Arbitrum** 🩄 Uniswap CCA live on Arbitrum ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Everything you need to know for Open House NYC 2026 ![G_RrCVyaYAAcmgD.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/01/G_RrCVyaYAAcmgD.jpeg) Build. Ship. Scale. We're about to kick off our online Buildathon phase on Feb 05, with plenty of new announcements and 5 confirmed sponsors. We've also prepared a detailed explanation of what to expect at Open House NYC. âžĄïž [Everything about OpenHouse](https://x.com/Swagtimus/status/2016536710260089219?ref=blog.arbitrum.foundation) ### How Arbitrum Handled an Extreme TPS & Gas Spike This weekend, the market wiped out $220B in a matter of hours. Every chain was stress-tested at the same time. Thanks to the recent protocol update, ArbOS 51, which introduced different gas pricing windows, peaks were absorbed smoothly. Want to know why? Check out the video below 👇 > $220B wiped from the crypto market over the weekend. > > Every chain was stress-tested at once. > > Median fees: The L1 hit $8.66, other L2s hit $0.61, [@arbitrum](https://twitter.com/arbitrum?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) hit $0.20\. > > Here's why. [pic.twitter.com/vfUMiVSgmX](https://t.co/vfUMiVSgmX?ref=blog.arbitrum.foundation) > > — Ben Greenberg (@hummusonrails) [February 3, 2026](https://twitter.com/hummusonrails/status/2018596190896689520?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### A complete Stylus recap by Thirdweb Thirdweb, a leading software development company, shared a detailed recap outlining what their contribution to Arbitrum Stylus looks like: Airdrop contracts, ZK proof templates, modular Rust modules, and full SDK support. ![Thirdweb-stylus.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/01/Screenshot-2026-01-29-at-18.50.11.png) [Follow the recap](https://x.com/ArbitrumDevs/status/2013638220609700311?ref=blog.arbitrum.foundation) ### Building on Arbitrum: Mastering Scaffold Stylus Session [@Dev3Pack](https://x.com/dev3pack?ref=blog.arbitrum.foundation) and [@themetalboyrick](https://x.com/themetalboyrick?ref=blog.arbitrum.foundation) put together a detailed workshop that covers topics such as client communications, live coding demos, and step-by-step builder guides. âžĄïž [Start building with Stylus](https://www.scaffoldstylus.com/?ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### Uniswap Continuous Clearing Auctions are now live on Arbitrum Don't lose out on this new liquidity bootstrap standard. Uniswap CCA's introduce onchain-native market creation, more fair and gradual price discovery, as well as automatic liquidity seeding on Uniswap V4. ![CCA-Blog-Post-3__2_.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/01/CCA-Blog-Post-3__2_.png) [Discover Uniswap CCA](https://cca.uniswap.org/?ref=blog.arbitrum.foundation) ### Arbitrum DAO Commits $6M in Grants to Help Fund Ecosystem Arbitrum DDA 3.0 is a one-year Grant Program with a total budget of $6.75M. The program is aimed at supporting developers across five high-demand categories, including New Protocols and Ideas ($1.5M), Dev Tooling ($1.5M), Gaming ($1.5M), Education+events ($1.5M), and a new experimental Orbit campaign ($750K). Have an idea? Apply to fund your proposal👇 [Fund your Proposal](https://arbitrum.questbook.app/?ref=blog.arbitrum.foundation) ### Confidential Stablecoin Payments app Privara Launches on Testnet With demand for onchain privacy picking up steam, Privara, a privacy-preserving payments app powered by Fully Homomorphic Encryption (FHE) is now live on testnet. [Check the announcement](https://x.com/PrivaraXYZ/status/2016965397438685338?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### Nethermind Sync Complete on Arbitrum Sepolia The Nethermind Arbitrum Nitro plugin has synced on Arbitrum Sepolia, and now functions in archive mode. The Nethermind client now covers Stylus execution, as well as all recent ArbOs upgrades (including Dia). ![G_BUWCoXQAAf6rS.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/01/G_BUWCoXQAAf6rS.jpeg) âžĄïž [Explore Arbitrum Upgrade](https://docs.arbitrum.io/run-arbitrum-node/arbos-releases/arbos51?ref=blog.arbitrum.foundation) ### Tooling update on Arbitrum Nova To better improve efficiency for our developers, the Arbitrum Nova tool set will be updated throughout the course of 2026, with the first tooling update having already being added on Jan 31st âžĄïž [Changes to Arbitrum Nova](https://x.com/ArbitrumDevs/status/2013638220609700311?ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### New Proposal: Onchain Scoring for Arbitrum Gaming Guilds An ecosystem contributor recently introduced a reputation engine, a modular framework designed to quantify DAO contributions and mitigate Sybil attacks. It uses real-time Arbitrum data and Snapshot history to build verifiable reputation scores. [Review the proposal](https://forum.arbitrum.foundation/t/introducing-guild-reputation-engine-on-chain-scoring-for-arbitrum-gaming-guilds-live-mvp-api/30399?ref=blog.arbitrum.foundation) ### Arbitrum Open House Youtube Announcement Still not sure what OpenHouse is? Want some tips on how to get involved? We answer all of your questions in our recent YouTube video. --- That’s all from Builder’s Block #010\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Builder's Block #009 - Open House 2026 Locations & ArbOS Dia Upgrade URL: https://blog.arbitrum.foundation/builders-block-009-open-house-2026-locations-arbos-dia-upgrade/ Last updated: 2026-01-19T13:00:51.000Z 💡 ****What's Important This Week** đŸ§‘â€đŸ’» ****O**pen House starts bigger than ever ⚙ New features with ArbOS Dia Upgrade 🩀 Rust SDK v0.10.0 is live ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Open House 2026 Launches Globally Arbitrum's Open House is back, bigger than ever: $800K in prizes, four cities worldwide, designed for serious founders ready to ship real products. First edition: NYC. The online phase starts on January 29th. ![open-house.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/01/open-house.jpeg) âžĄïž [How to Register](https://x.com/ArbitrumDevs/status/2010819177653944791?ref=blog.arbitrum.foundation) ### ArbOS Dia Upgrade Goes Live The latest ArbOS Dia upgrade is here, bringing smoother fees during spikes, foundations for massive throughput, passkey onboarding, new interop tokens, and Ethereum Fusaka support. Unlocking faster, more efficient building on Arbitrum. âžĄïž [Dive into the Upgrade Details](https://blog.arbitrum.io/arbos-dia/?ref=blog.arbitrum.foundation) ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### Build Your First App on Arbitrum Hands-on guide for newcomers: Learn step-by-step how to deploy your first Arbitrum app using Vibecoding, specifically for devs who are beginning their journey using the ecosystem's powerful tools. âžĄïž [Start Building Now](https://x.com/hummusonrails/status/2009536865355940195?ref=blog.arbitrum.foundation) ### x402 v2: Production-Ready Enhancements Unlock pay-per-use models: New changes to x402 introduce v2 for agentic payments - **Standardized Network Identity (CAIP-2)** - **Inspectable Infrastructure (/supported)**: Facilitators are no longer "black boxes" that builders must trust blindly. - **Header-First Negotiation**: To avoid breaking middleware, proxies, or application logic, payment metadata has moved out of the JSON body, following RFC-6648. - **Strict Idempotency and Verification** - **Settlement Lifecycle Hooks**: V2 uses EIP-712 typed data for explicit settlement signing ![G9qLjHBXsAAKh4r.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/01/G9qLjHBXsAAKh4r.jpeg) âžĄïž [Read the Full Breakdown](https://x.com/hummusonrails/status/2008432789511708966?ref=blog.arbitrum.foundation) ### StylusSaturdays: Why learn Stylus in 2026? Unlock Stylus in 2026: Migrate Solana contracts to Arbitrum effortlessly using StylusPort's handbook. âžĄïž [Migrate from Solana to Arbitrum](https://substack.com/home/post/p-181570232?ref=blog.arbitrum.foundation) ### Hardhat + Stylus Support in Development Unified workflows incoming: CoBuilders is integrating Hardhat with Stylus for seamless Solidity and Rust handling, no more tool-switching for cleaner developer experiences. âžĄïž [Follow the Progress](https://x.com/cobuildersxyz/status/2008533257500192892?ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### Explore Arbitrum Tools on Chain.Love Discover and compare infra easily: Chain.Love's Arbitrum Toolbox organizes RPCs, indexers, oracles, faucets, and more. ![G839iSNWgAAHOCZ.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/01/G839iSNWgAAHOCZ.jpeg) âžĄïž [Upgrade Your SDK Today](https://x.com/chainloveweb3/status/2003537617657245967?ref=blog.arbitrum.foundation) ### Arbitrum Audit Program Open for Applications Gear up for secure launches: The Arbitrum Audit Program is still live, offering early support for teams planning audits to ship with confidence. Perfect for kicking off 2026 strong. ![0725_Arbitrum_AuditProgram_R3_2.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2026/01/0725_Arbitrum_AuditProgram_R3_2.jpg) âžĄïž [Apply for Audit Support Now](https://x.com/ArbitrumDevs/status/2011075831792353323?ref=blog.arbitrum.foundation) ### ArbiFuel Gas Sponsorship Program Fuel your builds without the gas hassle: ArbiFuel sponsors fees for early-stage teams to test, deploy, and onboard users. âžĄïž [Get your gas sponsored](https://x.com/ArbitrumDevs/status/2008249029885653317?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### Stylus Rust SDK v0.10.0 Released Level up your Rust workflows: The new Stylus Rust SDK introduces stylus-tools for programmatic deployments, activations, and verifications, making CI, tests, and multi-contract pipelines a breeze. âžĄïž [Check the release details](https://github.com/OffchainLabs/stylus-sdk-rs/releases/tag/v0.10.0?ref=blog.arbitrum.foundation) ### Erigon Nitro Sepolia Node with ArbOS 51 Dia Massive efficiency boost: Erigon's stable Nitro Sepolia node supports ArbOS 51 Dia with minimal storage (234GB), concurrent fetching, and snapshots. âžĄïž [Check the last update](https://x.com/ErigonEth/status/2004953890379243949?ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### DevRel Engineer Roles Open at Arbitrum Join the team: Arbitrum is hiring DevRel Engineers, including APAC and LATAM-focused positions, for those passionate about supporting builders and creating technical content. âžĄïž [Apply or Share the Opportunity](https://arbitrum.foundation/careers?ref=blog.arbitrum.foundation#jobs) ### Audit Program Transparency Report Inside the numbers: A detailed look at the Arbitrum Audit Program's first phase, with 11 projects approved from 81 total applications. âžĄïž [Explore the Report](https://x.com/aboutlo/status/2009577224580505982?ref=blog.arbitrum.foundation) ### Arbitrum is Going All In on Youtube and TikTok In 2026, Arbitrum is expanding beyond the scope of crypto Twitter and bringing you, our community, a variety of much-needed video content on YouTube and TikTok. In these videos, you can expect insights into ecosystem projects, stablecoins, RWAs, Arbitrum protocol upgrades, and many other exciting topics! --- That’s all from Builder’s Block #009\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Builder's Block #008 - Porting Solana to Arbitrum, Prysm Post-Mortem & WASM performance URL: https://blog.arbitrum.foundation/builders-block-008-porting-solana-to-arbitrum-prysm-post-mortem-wasm-performance/ Last updated: 2025-12-23T14:17:31.000Z 💡 ****What's Important This Week** đŸ”č Prysm ****Post-Mortem** on Fusaka ⚙ Why WASM is the answer to ****execution models** đŸ’Č ****Gas** is the new ****Vitalik's** discussion ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Prysm Mainnet Post-Mortem Technical analysis of the "Fusaka" incident on Mainnet. Details the root cause, the impact on network participation, and the patches implemented in v7.0.1+ to prevent recurrence. âžĄïž [Read post-mortem](https://prysm.offchainlabs.com/docs/misc/mainnet-postmortems/?ref=blog.arbitrum.foundation) ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### Discover how WASM Elevates Performance Beyond the EVM ![stylus-multivm.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/stylus-multivm.jpg) A deep dive into how Stylus uses WebAssembly to complement EVM execution limitations. Explains how WASM enables more efficient computing and lower gas costs while maintaining full interoperability. âžĄïž [Read article](https://blog.arbitrum.foundation/how-wasm-elevates-performance-without-leaving-the-evm/) ### Optimized Redstone Oracles: A technical deep dive New technical analysis from RedStone integration with Arbitrum Stylus to process oracle data with lower latency and cost. âžĄïž [Read on X](https://x.com/castle%5Flabs/status/1998771744715292781?s=20&ref=blog.arbitrum.foundation) ### 5 hands-on sessions on Arbitrum Stylus A full course on YouTube, including an intro to Stylus, a speedrun, Uniswap fork in Stylus-based coding, Stylus data types, and the Stylus CLI. âžĄïž [Watch it on YT](https://www.youtube.com/playlist?list=PLDQrbdlvR%5FeEKv42YTC1DNzgdbv-x%5FNOs&ref=blog.arbitrum.foundation) ### Building Agentic Payment Flows Session If you’re building for x402 and AP2, this session is a must watch. CapxAI and Arbitrum have prepared a full workshop on Agentic Payment Flows and Private AI Inference. âžĄïž [Watch it on X](https://x.com/0xCapx/status/2001691632283140106?s=20&ref=blog.arbitrum.foundation) ### Migrate Solana applications to Ethereum liquidity Solana teams looking to expand into Ethereum liquidity without ditching Rust: StylusPort is a practical handbook + CLI/MCP assistant for bringing Rust programs to Arbitrum Stylus with familiar tooling. âžĄïž [Watch it on YT](https://www.youtube.com/watch?v=cHVTs9Bs8mQ&ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### L2 vs L1 Economic Models A breakdown of the fundamental differences between Ethereum L1 and L2 economics. Analyzes long-term sustainability, sequencer revenue models, and data availability costs. âžĄïž [Read thread](https://x.com/Offchain/status/1998409395672145927?s=20&ref=blog.arbitrum.foundation) ### Confidential Payments and Lending Auctions Talk Technical exploration of implementing confidential stablecoins and sealed-bid lending auctions directly on Arbitrum by Peyman Momeni from Fairblock. --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### Meet Steven Goldfeder ![G79RuumXEAAiupS.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/G79RuumXEAAiupS.jpeg) Join Offchain Labs' CEO at the end-of-year special event, in person in Tel Aviv or online. There is a surprise planned. âžĄïž [Grab Your Spot Now](https://luma.com/2sejr2tg?ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### Vitalik on Trustless Gas Prediction Markets Vitalik Buterin discusses architecture for trustless gas prediction markets. A technical approach to optimizing fee estimation and improving block market efficiency on L2s. âžĄïž [Read on X](https://x.com/VitalikButerin/status/1997279838252531823?ref=blog.arbitrum.foundation) ### AIP: Activate ArbOS 51 Constitutional proposal to activate ArbOS 51 "Dia". Includes support for Ethereum's Fusaka upgrade changes, gas pricing improvements, and critical node optimizations. âžĄïž [Vote on Tally](https://www.tally.xyz/gov/arbitrum/proposal/53154361738756237993090798888616593723057470462495169047773178676976253908001?govId=eip155:42161:0xf07DeD9dC292157749B6Fd268E37DF6EA38395B9&ref=blog.arbitrum.foundation) ### Proposal: Stablecoin Fast Lane Forum discussion on creating a transaction fast lane (similar to TimeBoost) specifically optimized for stablecoin payments to reduce latency in financial transactions. âžĄïž [Read proposal](https://forum.arbitrum.foundation/t/create-another-fast-lane-similar-to-timeboost-specifically-optimized-for-stablecoin-payments/30336?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #008\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Arbitrum in 2025: The Year of Everywhere URL: https://blog.arbitrum.foundation/arbitrum-in-2025-the-year-of-everywhere/ Last updated: 2025-12-23T08:08:19.000Z 2025 marked a turning point for blockchain infrastructure. This was the year institutional finance moved from exploration to execution. Tokenisation left the whiteboard and entered production. TradFi and onchain finance started to merge into a single operating model. And at the centre of that shift was Arbitrum. From powering the world’s largest retail trading platform to settling tokenised funds from some of the world’s largest asset managers, Arbitrum continued to show up as the venue of choice for major global institutions. “2025 was the year that crypto captivated institutional finance and that megatrend will continue to accelerate across the landscape as capital allocators now act with conviction,” said Brendan Ma, Head of Investment Strategy at the Arbitrum Foundation. “We have seen major milestones across the ecosystem, and Arbitrum is uniquely positioned to drive the momentum in 2026 by supporting institutional adoption, helping and growing talented teams, and reinvesting for long-term growth.” That conviction is visible everywhere. Robinhood’s launch of tokenised securities on Arbitrum showed what broader financial access can look like. Stablecoin supply climbed by [82%](https://tokenterminal.com/explorer/projects/arbitrum/metrics/ecosystem-stablecoin-supply?interval=ytd&ref=blog.arbitrum.foundation). Arbitrum also continued its lead in total value secured among L2s, supported by surging developer activity. ArbitrumDAO moved in lockstep with that scale: unlocking capital expansion through Franklin Templeton, WisdomTree, and Spiko deployments, and reinvesting returns for long-term ecosystem growth. As 2025 closes, we reflect on some of the milestones that Arbitrum reached this year and the foundations laid for an exciting 2026\. ### **Network Market Share** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/data-src-image-54334644-a512-4370-9748-b73dec76c8f1.png) Arbitrum One crossed **2.1 billion+ lifetime transactions in 2025** after taking roughly three years for the first billion. The network added the second billion in less than 12 months. It continued to maintain its position as the leading L2 by market share, reaching a **$20 billion+ Total Value Secured in 2025\.** ### **Ecosystem Expansion** The Arbitrum ecosystem grew rapidly in 2025, with **100+ chains live or in development**, including some notable launches like the Ethereal Perps DEX, Zama, and Blackbird. [**1,000+ projects**](https://portal.arbitrum.io/projects/infra-and-tools?ref=blog.arbitrum.foundation) are powered by Arbitrum as of today, making it a top 3 chain by number of protocols. At the same time, the network generated over [**$600M**](https://tokenterminal.com/explorer/projects/arbitrum/ecosystem/gdp?interval=365d&ref=blog.arbitrum.foundation) **in ecosystem GDP, a 30%+ YoY increase** based on fees produced by applications on Arbitrum One. ### Institutional Deployments As RWAs went mainstream, Arbitrum became the venue of choice for major institutions bringing financial products into crypto, welcoming notable partners including **Robinhood, Franklin Templeton, Blackrock, Spiko, and more.** In June, Robinhood announced tokenized US stocks and ETFs for EU customers on Arbitrum. In just 6 months, this has ballooned to almost **2,000 tokenized equities on Arbitrum One**. Robinhood will continue the momentum in 2026 with a dedicated blockchain built using the Arbitrum stack. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/data-src-image-c1f703f5-7403-4b61-a03b-d5e217937a40.png) ArbitrumDAO’s [STEP 2.0 initiative](https://www.tally.xyz/gov/arbitrum/proposal/13323456481927947871314500108227684550647495448005726995657704713229313956489?govId=eip155:42161:0x789fC99093B09aD01C34DC7251D0C89ce743e5a4&ref=blog.arbitrum.foundation) allocated **35M ARB toward RWA initiatives, including tokenized US Treasury products** and supporting WisdomTree’s WTGXX, Spiko’s USTBL, and Franklin Templeton’s BENJI. In less than 12 months of launch, Spiko achieved $200M+ in AUM on Arbitrum. ### **DeFi & Financial Infrastructure** Arbitrum continued to grow as the liquidity anchor for DeFi. Stablecoins and RWAs saw a breakout in adoption on Arbitrum this year. Stablecoin supply grew **82% YoY**, roughly reaching **$8 billion+** market cap. The network did not just grow as the deepest venue for onchain dollars amongst L2s but also as the most diverse across USDC, USDT, and newer assets like **USDai, thBILL, and syrupUSDC**. Ecosystem initiatives like [DRIP](https://arbitrumdrip.com/?ref=blog.arbitrum.foundation) helped fuel **229%+ growth** in stablecoins on Arbitrum since its launch in September 2025\. Likewise, **RWA tokenization on Arbitrum reached $1.1B+** in October, representing an 18X increase from the same period in 2024\. This was coupled with scaled momentum across DeFi activities. Arbitrum hosted the largest deployments of Aave and Uniswap outside Ethereum, with **active loans rising 109% to $1.5B** and new lending products from teams like **Fluid expanding over 460%**. DRIP program welcomed new teams like **Morpho, Euler, and Maple Finance** into the ecosystem. ### **Financial Strength** Arbitrum is uniquely positioned for high and sustainable margins as an L2, allowing the DAO to reinvest into a compounding flywheel for significant long-term growth. Arbitrum's ecosystem will end the year with **90%+ gross margins across four different revenue streams,** up from just two last year. [Timeboost](https://docs.arbitrum.io/how-arbitrum-works/timeboost/gentle-introduction?ref=blog.arbitrum.foundation), for example, launched in 2025 and generated **$5M+ revenue in the first 7 months.** ArbitrumDAO is on track to end Q4 2025 with roughly **$6.5M gross *profit*** (\~$26M annualized) and more than 50%+ period-on-period growth. The DAO has also strengthened its balance sheet, holding **over $150M in non-native assets**, including cash equivalents and ETH, positioning the ecosystem for sustained and strategic expansion. ### **Looking Ahead** 2025 was a story of growth across major verticals and financial assets. From institutions to major asset classes, consumer applications to stablecoins, the ecosystem demonstrated its robustness to house global-scale financial activity. As we head into 2026, the goal is simple. Together, we deepen the rails laid out to bring the benefits of open programmable finance everywhere they can create value. The work ahead is significant, but so is the momentum. The ecosystem is ready for its next chapter. *Arbitrum Everywhere.* ### How Wasm Elevates Performance Without Leaving the EVM URL: https://blog.arbitrum.foundation/how-wasm-elevates-performance-without-leaving-the-evm/ Last updated: 2025-12-19T04:16:53.000Z Most conversations about execution models in Ethereum focus on proving speed, zkVM design, or whether RISC-V should become a universal instruction set. These are worthwhile protocol questions, but they are not the first concerns a builder faces when trying to ship fast, reliable onchain applications. Builders think about execution environments. Builders think about predictable performance across machines. Builders think about how easily code can be profiled, optimized, and reproduced in production. These concerns shape real workloads far more than the debates researchers have. This is where WebAssembly stands out. Wasm has already proven itself as a portable, reproducible execution format across billions of devices. Developers know how it behaves. Toolchains understand how to optimize it. Engines know how to compile it to fast, native code. When Stylus brought Wasm into the Arbitrum ecosystem, developers gained access to these same qualities onchain, in a format that coexists with the EVM while sharing the same state tree. After [more than a year of Stylus in production](https://blog.arbitrum.io/arbitrum-stylus-mainnet/?ref=blog.arbitrum.foundation), the verdict is clear. Wasm gives builders predictable speed, structured execution, safer instrumentation, and the flexibility to evolve across future proving systems. Below is a closer look at why this matters for builders. ## The three layers every builder should understand To understand why Wasm improves performance, it helps to clarify the three roles that instruction sets play in a blockchain environment. What follows is adapted from [a post on Ethereum Research](https://ethresear.ch/t/why-risc-v-is-not-a-good-choice-for-an-l1-delivery-isa-and-why-wasm-is-a-better-one/23491?ref=blog.arbitrum.foundation) by Mario Alvarez, Matteo Campanelli, Tsahi Zidenberg, and Daniel Lumi of Offchain Labs. > Recently there has been discussion about replacing EVM with RISC-V as the ISA for L1 Ethereum. [@Offchain](https://twitter.com/Offchain?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) we believe WASM should be the future smart contract ISA for L1 instead of RISC-V. RISC-V can still be used as the ISA for ZK Proving. > > We offer this guidance from our
 > > — Lumi (@zkLumi) [November 21, 2025](https://twitter.com/zkLumi/status/1991894182965964911?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) The three instruction set architectures (ISA) can be understood as: - **Delivery ISA (dISA)**: This is the format that smart contracts are deployed in. The EVM bytecode you write today is a dISA. Stylus uses Wasm as its dISA. This is the ISA that your code is actually stored in when it lands onchain. - **Proving ISA (pISA)**: The low level instruction set used inside proving circuits. Many zkVMs use variants of RISC-V today, but the proving landscape is still evolving. - **Execution ISA (eISA)**: This is the ISA that node software uses to execute the state transition function. It is mostly a concern for client implementors. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/isa_architectures.png) As a builder, you interact almost entirely with the delivery layer. This is where your contracts live, and this is where performance gains matter most. A key insight is that the delivery ISA does not need to match the proving ISA or the execution ISA. The ISA that works best for circuit layouts is rarely the ISA that works best for safe execution and predictable optimization. Wasm fits the delivery role precisely because it can be cleanly compiled into whatever proving ISA or backend emerges in the future. It is stable, structured, and easy to transform. Arbitrum’s execution layer (ArbOS) supports both EVM bytecode and Wasm instructions. This is why both contract types share the same state and can run side by side. Wasm does not replace the EVM. It complements it. ## What performance means for builders When protocol engineers say “performance,” they often mean prover throughput. Builders mean something different. Builders are looking for execution speed on common hardware. Most of the heavy lifting happens in RPC endpoints that serve `eth_call` and gas estimation. These workloads are a high percentage of the volume of onchain transactions and they run on commodity ARM and x86 hardware. For builder performance, a dISA needs to run fast here, not just inside proof circuits. At the same time, the VM must allow for clean and safe insertion of gas meters, safety guards and stack checks. This can only work well with structured code that avoids arbitrary jumps. Similarly, the developer experience requires mature compilers, good profiling tools, and predictable binary formats to achieve a high-performance builder environment. Finally, none of the above matters if the execution environment cannot survive future changes in proving systems. Builders need a format that will not be invalidated by new proving systems. A future proofed dISA shields code from shifts in low-level proving choices. Wasm delivers across all of these dimensions. ## How Wasm improves performance today Stylus has been live for a bit more than a year, and that year has shown some remarkable takeaways. The strongest takeaway is also the most simple. Wasm contracts can be compiled to native machine code on the platforms that people actually use. This gives builders near-native execution speed without requiring any specialized hardware or specialized node setups. Wasm was designed from the ground up to compile efficiently into the native instruction sets used by ARM and x86\. Modern toolchains have highly optimized Wasm paths, and the JITs (just-in-time compilation) in environments like browsers have been hardened over billions of executions. This means that Wasm smart contracts can take advantage of aggressive optimizations that have nothing to do with blockchain but everything to do with observable real-world performance. For builders, this translates into faster signature verification, faster hashing, cheaper loops, and large performance wins for compute heavy workloads. It's not just about near-native speed, Wasm also provides significant wins in structure. ### Structured control flow helps both safety and speed Wasm uses structured blocks instead of arbitrary jumps. For performance and safety, this is a major advantage. Structured control flow: - Lets the VM validate the program in linear time - Allows safe and deterministic injection of gas meters - Makes the code easier for compilers to optimize Builders see these benefits in practice. Contracts behave predictably. Profiling tools work more reliably. Hazardous bytecode patterns simply are not expressible in Wasm. ![EVM and Wasm share state on Arbitrum, while Wasm’s structured control flow enables more efficient compilation and execution.](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/wasm-vs-evm.png) Wasm's linear memory and typed instructions make its behavior easier to reason about. JITs can optimize it aggressively. Common operations like loading, storing, slicing, hashing, and transforming data becomes significantly faster and cheaper than their EVM equivalents. For computationally heavy workloads this difference means everything. ### Developer experience is performance One of the biggest performance multipliers in the real world is good developer experience. The ability for developers to iterate quickly is often the differentiator between applications that lag behind and those that keep up with their user needs. Wasm inherits a mature ecosystem of compilers, debuggers, profilers, and build tools. Rust, C, C++ and TypeScript developers can use the same instrumentation tools they already know. This leads to better velocity and more predictable code, which is where the largest performance wins usually come from. A multi-language reality means that different problems can be solved in differnt ways. Wasm makes that possible. ## Stylus as the live example Stylus has been a major part of Arbitrum’s execution model long enough to generate real data, and one of the clearest demonstrations of its impact comes from RedStone, a modular oracle framework widely used across DeFi. RedStone is a strong example because their workload is both computation heavy and latency sensitive, making it a good benchmark for what Stylus actually changes in practice. You can read the full deep dive: [**How RedStone Is Advancing Oracle Capabilities With Stylus**](https://blog.arbitrum.io/how-redstone-is-advancing-oracle-capabilities-with-stylus/?ref=blog.arbitrum.foundation) [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/1125_Arbitrum_Redstone_CaseStudy_R2.jpg)](https://blog.arbitrum.io/how-redstone-is-advancing-oracle-capabilities-with-stylus/?ref=blog.arbitrum.foundation) Oracles sit at the center of every DeFi market. They collect data from reputable sources offchain, cryptographically sign it, and then verify that data onchain for consumer contracts. RedStone’s architecture separates these steps into three independent layers: aggregation, signing, and onchain verification. This modular structure keeps the system flexible and makes it easy to integrate new data sources without altering how verification works. Verification is the bottleneck. Even with compression and batching, the EVM imposes a compute ceiling that becomes expensive as workloads scale. The stack based memory model, the fixed 256 bit word size, and the simplicity baked into the EVM design all introduce friction for applications that need to perform large, data heavy updates. RedStone adopted Stylus to push past that limit. Stylus allows Wasm contracts to run beside EVM contracts while sharing the same state. This let RedStone bring their existing Rust SDK onchain with no rewrite tax. Wasm gave them direct memory access, efficient byte level operations, and optimizations that map cleanly to ARM and x86 hardware. The results were immediate. đŸ—Łïž “Stylus gives us the best of both worlds: native speed Wasm for compute and seamless interop with Solidity contracts already live on Arbitrum. We can use Rust toolchains, tap Arbitrum precompiles, and still interact with the massive EVM ecosystem. No vendor lock-in, no rewrite tax for our users.” **\- Maja Cholewka, RedStone* Stylus also supported incremental adoption. Existing EVM consumers did not need to rewrite their contracts. They simply read from the new Stylus powered feed in parallel with the older EVM adapter. No additional audit was required. One year later, RedStone continues to report strong performance improvements: | Metric | EVM | Stylus | Improvement | | --------------------------- | --- | ------ | ------------------- | | Base computational overhead | 35k | 23k | **34.3% reduction** | | Per-feed computation | 16k | 8k | **50.0% reduction** | RedStone now processes many feeds per transaction and supports structured datasets far larger than what EVM only oracles can handle. đŸ—Łïž “Direct byte access and efficient data structures let us process many feeds per transaction without the usual 256-bit limitation. In practice, we can scale to dozens of feeds today and are architected toward handling 1MB class data windows per block for specialized use cases.” **\- Maja Cholewka, RedStone* The RedStone case is a preview of what high performance onchain systems will look like as Wasm adoption grows. Their plan is to continue encouraging consumers to adopt their Stylus powered oracle, and more protocols are likely to follow this pattern as they outgrow the compute limits of the EVM while still relying on its composability and ecosystem. Stylus makes that path available today. Wasm is not replacing the EVM. It sits beside it and opens up space for workloads that were never practical before. As more teams run into the limits of stack based execution and fixed width arithmetic in the EVM, the ability to bring mature toolchains and native speed compute onchain will matter even more. Stylus shows that this path is already real, not hypothetical. Builders who want performance today and flexibility tomorrow now have an environment that gives them both. ### Joining ArbitrumDAO: Your Complete Governance Guide URL: https://blog.arbitrum.foundation/joining-arbitrumdao-your-complete-governance-guide/ Last updated: 2025-12-11T17:41:56.000Z ArbitrumDAO puts real power in the hands of its community. It governs one of the most active and liquid blockchain networks, processing [billions in monthly transaction volume](https://arbiscan.io/chart/tx?ref=blog.arbitrum.foundation) and controlling a vast [onchain treasury](https://dune.com/entropy%5Fadvisors/arbitrum-dao-treasury?ref=blog.arbitrum.foundation). Unlike protocols where decisions rest with a foundation or core team, ArbitrumDAO empowers its community to make binding calls on everything from protocol upgrades to treasury spending. Decentralized governance thrives on participation, and in ArbitrumDAO, it’s never been easier to get involved. You can spend a few minutes reading and discussing Forum posts, delegate your voting power, take on the role of an active delegate, apply for grants to build ecosystem projects, or contribute professionally to organizations advancing Arbitrum’s mission. That’s what makes ArbitrumDAO unique: there’s a place for every kind of contributor, and together, these roles reinforce one another, creating a resilient ecosystem and one of the strongest models of decentralized governance in action. Below, we'll walk through each of these roles in detail: what they involve, how to get started, and what you can expect as you grow your participation. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/data-src-image-cb8c67a7-4dd7-4841-9cbf-3605e7044d14.png) ## For token holders: Influencing Arbitrum’s direction As an ARB token holder, you can vote on protocol changes, funding decisions, and ecosystem development. Your participation matters. ArbitrumDAO controls not just protocol upgrades but also treasury allocation, changes to the constitution, and the Security Council elections, giving you more influence than in typical blockchain governance. ### Participate by voting. Two ways: 1. **Vote directly** You need to hold ARB tokens to vote. To vote directly, you need to delegate voting power to yourself through an onchain transaction (via the [Tally](https://www.tally.xyz/gov/arbitrum?ref=blog.arbitrum.foundation) interface). Think of it as activating your tokens for governance. Offchain temperature checks generally gauge community sentiment through signaling votes on [Snapshot](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth) before moving to binding decisions. Onchain votes are binding, and when they pass, proposals execute automatically. These are conducted through Tally. **2\. Delegate voting power** Not everyone has time to follow every proposal, and that's completely fine. Delegation means assigning your voting power to someone else who will vote according to their judgment. You can choose a delegate whose values and priorities align with yours, and change delegates at any time. Delegate your ARB through the delegation interface (here's a [helpful guide](https://docs.arbitrum.foundation/how-tos/select-delegate-voting-power?ref=blog.arbitrum.foundation)), then check in regularly to see how your delegate is voting and whether they're still representing your interests. Prefer to opt out entirely? You can delegate to the [Exclude Address](https://forum.arbitrum.foundation/t/re-delegation-week-next-steps-for-delegators/26091?ref=blog.arbitrum.foundation) to remove your tokens from governance participation. ### Stay informed The [governance forum](http://forum.arbitrum.foundation/?ref=blog.arbitrum.foundation) is where proposals are discussed before they go to an offchain temperature check vote, followed by an onchain vote. Check in for weekly [voting reminders](https://forum.arbitrum.foundation/c/governance/weekly-voting-reminders/47?ref=blog.arbitrum.foundation) or follow the [Arbitrum Governance X account](https://x.com/arbitrumdao%5Fgov?ref=blog.arbitrum.foundation) to stay current without constant checking. If you are new to governance,we recommend starting by delegating while you learn how the system works. As you become more familiar with the proposals, delegates, and discussion dynamics, you can always switch to voting directly. [Browse delegates →](https://www.tally.xyz/gov/arbitrum/delegates?ref=blog.arbitrum.foundation) ## For community leaders: Becoming a delegate Delegates are the backbone of active governance. You vote on behalf of ARB holders who trust your judgment, as well as on behalf of yourself. This role comes with real influence: you'll shape protocol upgrades, funding allocation, and ecosystem development while building your reputation as a governance leader. However, it also comes with responsibility and time commitment. The top delegates hold significant influence, but there's always room for new voices who bring fresh perspectives and specialized expertise. ### Four steps to becoming a delegate: 1. **Understand what the role actually involves.** Voting is just the visible part of being a delegate. The real work happens in forum debates where proposals are dissected and improved, in community calls where strategy is discussed, and in specialized working groups for delegates and contributors that tackle specific challenges. The most effective delegates explain their reasoning publicly, so their delegators understand the thinking behind each decision. This means researching proposals deeply, understanding their technical and economic impact, and asking the hard questions before voting happens. [![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/image.png)](https://messari.io/report/arbitrum-everywhere-beyond-the-limits?ref=blog.arbitrum.foundation) **Delegate activity metrics showing voting participation rates and engagement levels as of Oct 31, 2025\. Source:* [Messari](https://messari.io/report/arbitrum-everywhere-beyond-the-limits?ref=blog.arbitrum.foundation) 1. **Develop your foundation** Before seeking delegations, you need to understand what you're voting on. Start with [the Constitution](https://docs.arbitrum.foundation/dao-constitution?ref=blog.arbitrum.foundation), ArbitrumDAO's foundational document that defines how governance works, which is also upgradeable via the governance process. Then study successful delegate profiles on Tally to see what good delegation looks like. Look at their voting patterns and read their explanations. Finally, get comfortable with [Arbitrum's technical basics](https://docs.arbitrum.io/get-started/overview?ref=blog.arbitrum.foundation). You don't need to be a developer, but you should understand what makes Arbitrum different and why certain technical decisions matter. 1. **Create your public profile** Write a clear platform statement explaining your values, priorities, and what constituents can expect from you. Are you focused on technical excellence? Ecosystem growth? Treasury management? Be specific. Submit this delegate statement to [the forum](https://forum.arbitrum.foundation/c/governance/delegate-statements/45?ref=blog.arbitrum.foundation) where potential delegators can find you, set up your Tally profile completely, and [delegate ARB tokens](https://docs.arbitrum.foundation/how-tos/select-delegate-voting-power?ref=blog.arbitrum.foundation) to yourself. As you start voting, add your rationale for each vote. This transparency is what earns trust and attracts more delegation. 1. **Build your support base** Delegation isn't automatic. Engage meaningfully in forum discussions by adding value to others' conversations. Attend governance community calls regularly. Show up consistently, demonstrate good judgment, and the delegations should follow. The delegates who attract the most support aren't necessarily the loudest voices, but are the ones who consistently show up, think critically, and explain their reasoning clearly. [Create your delegate profile →](https://docs.tally.xyz/tally-features/navigating-the-tally-platform/tally-profile?ref=blog.arbitrum.foundation) ## For grant seekers: Accessing DAO funding ArbitrumDAO funds projects that drive adoption, improve technology, and expand use cases. Whether you're building applications, creating content, or developing infrastructure, grants provide the resources to turn your vision into reality. ### Programs available now The Arbitrum Grants [page](https://arbitrum.foundation/grants?ref=blog.arbitrum.foundation) lists all active opportunities. The Arbitrum Foundation and DAO run multiple grant programs targeting different ecosystem needs, from the [Domain Allocator Offering (D.A.O.) Program](https://arbitrum.questbook.app/?ref=blog.arbitrum.foundation), to the [Audit Program](https://tally.so/r/3xzEzv?program=aap&ref=blog.arbitrum.foundation) subsidizing security reviews, to [DRIP](https://blog.arbitrum.io/introducing-drip-the-defi-renaissance-incentive-program-on-arbitrum/?ref=blog.arbitrum.foundation) supporting DeFi activity, to [ArbiFuel](https://airtable.com/appzb4GfqGfrnDXjW/shrulGIIp6l6ezAlt?ref=blog.arbitrum.foundation) sponsoring gas fees, to [Arbitrum Gaming Ventures](https://arbitrumgamingventures.com/?ref=blog.arbitrum.foundation) supporting game developers, and more. Each program has different requirements, funding levels, and focus areas. ### How to apply successfully Each grant program has specific requirements, but some principles apply universally. Study successful past applications in the forum and program showcases, like the Domain Allocator Offerings (D.A.O.) Program. Notice what works: clear value propositions, detailed specifications, realistic budgets, and strong timelines. Engage in forum discussions before applying because community participation is important. Prepare detailed project specifications, justified budgets, and milestone timelines. Submit through the appropriate portal, stay engaged in discussions, and be responsive to feedback. Always review specific program guidelines before applying. [Browse active grants →](https://arbitrum.foundation/grants?ref=blog.arbitrum.foundation) ## For developers: Deploying on Arbitrum As a developer on Arbitrum, you gain access to advanced scaling technology, funding opportunities, and an expanding ecosystem. Your participation in DAO governance helps shape the technical roadmap and funding priorities that directly benefit your projects. ### Why governance matters for developers Protocol upgrades can improve performance and add features that indirectly make your application better. Grant funding can be used to build developer tools, grow teams, and upgrade infrastructure that makes your job easier. Emergency response procedures, such as those from the [Arbitrum Security Council](https://docs.arbitrum.foundation/concepts/security-council?ref=blog.arbitrum.foundation), could protect your applications when certain issues arise. Developers building on Arbitrum have insights that pure governance participants don't. By participating in governance, you help prioritize the upgrades and innovations that matter most to you. ### Getting started is simple Set up a governance forum account so you can participate in discussions. Then, follow the technical forum discussions, particularly in the [Proposals](https://forum.arbitrum.foundation/c/proposals/7?ref=blog.arbitrum.foundation) and [Technical Discussion](https://forum.arbitrum.foundation/c/technical-discussion/64?ref=blog.arbitrum.foundation) categories. You don’t need to read everything; just stay current on proposals that affect your work. Review active grants and DAO programs designed for developers: the [Domain Allocator Offering (D.A.O.) Program](https://arbitrum.questbook.app/?ref=blog.arbitrum.foundation) promotes new protocols, tooling and more, the [Arbitrum Audit Program](https://tally.so/r/3xzEzv?program=aap&ref=blog.arbitrum.foundation) can subsidize security reviews, [ArbiFuel](https://airtable.com/appzb4GfqGfrnDXjW/shrulGIIp6l6ezAlt?ref=blog.arbitrum.foundation) covers gas fees during development and testing, and [Arbitrum Gaming Ventures](https://arbitrumgamingventures.com/apply?ref=blog.arbitrum.foundation) supports builders of gaming projects and infrastructure. Subscribe to the Arbitrum Foundation's [Builder Newsletter](https://blog.arbitrum.foundation/tag/builder-newsletter/) and follow the [Arbitrum Developers X account](https://x.com/ArbitrumDevs?ref=blog.arbitrum.foundation) to stay informed about new opportunities and resources. Finally, either delegate to yourself and vote directly or delegate to someone who represents your priorities. See the “For token holders” section of this article for instructions. [Join the developer community →](https://forum.arbitrum.foundation/c/technical-discussion/64?ref=blog.arbitrum.foundation) ## For professionals: Contribute to an AAE (Arbitrum Aligned Entity) Arbitrum Aligned Entities (AAEs) are specialized organizations that support and advance the Arbitrum ecosystem in different capacities. From protocol development to ecosystem growth, these entities offer opportunities to work at the intersection of cutting-edge technology and decentralized governance. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/Frame-1.png) **Current structure of Arbitrum Aligned Entities (AAEs) as put together by OpCo.* ### Arbitrum Foundation The Foundation is a steward of the Arbitrum ecosystem. They accelerate development through grants and partnerships, facilitate governance, oversee technical advancements, and drive community growth through developer education, events, and the Ambassador Program. The Foundation works at the intersection of technical advancement and community coordination. ### Offchain Labs This is where Arbitrum's core technology is built and maintained. Offchain Labs handles protocol development, advancing Ethereum scaling solutions through research and innovation, and developing the tools and frameworks that make the ecosystem possible. If you're interested in core protocol work and pushing the boundaries of Layer 2 technology, this is the team building it. ### Entropy Advisors Working exclusively with ArbitrumDAO, Entropy Advisors helps the DAO mature into a disciplined capital allocator. They're building an organization that drives compounding, sustainable ecosystem growth through governance optimization and strategic guidance. ### Arbitrum Gaming Ventures Focused specifically on gaming ecosystem development and investment, this team supports game developers building on Arbitrum, funds and mentors gaming projects through investment and incubation, and grows the gaming community within Arbitrum. If you're passionate about bringing gaming to Layer 2, this is where that work happens. ### Arbitrum OpCo The Operation Company works on, manages, and provides oversight for DAO initiatives and coordinates between the DAO and AAEs, serving as the operational mesh layer. Keep an eye on future hiring announcements as the team develops. Explore AAE opportunities with the [Arbitrum Foundation](https://arbitrum.foundation/careers?ref=blog.arbitrum.foundation#jobs), [Offchain Labs](https://www.offchainlabs.com/careers?ref=blog.arbitrum.foundation#open-positions), [Entropy Advisors](https://entropyadvisors.com/?ref=blog.arbitrum.foundation#careers), [Arbitrum Gaming Ventures](https://arbitrumgamingventures.com/apply?ref=blog.arbitrum.foundation), and [OpCo](https://www.arbitrum-opco.com/?ref=blog.arbitrum.foundation). ## Lastly, stay connected ArbitrumDAO grows stronger with each person who decides to get involved. Whether you vote on proposals, build applications, lead communities, or contribute in ways we haven't imagined yet, your involvement drives the ecosystem forward. - **Forum**:[ forum.arbitrum.foundation](https://forum.arbitrum.foundation/?ref=blog.arbitrum.foundation) - **Voting**: [snapshot.org](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth) and[ tally.xyz](https://www.tally.xyz/gov/arbitrum?ref=blog.arbitrum.foundation) - **Updates**: [Weekly governance updates](https://forum.arbitrum.foundation/c/governance/weekly-voting-reminders/47?ref=blog.arbitrum.foundation) - **Social**: [@ArbitrumDAO\_gov](https://x.com/arbitrumdao%5Fgov?ref=blog.arbitrum.foundation) on X - **Calendar**: [Governance calls](https://calendar.google.com/calendar/u/0/embed?src=c%5F4157985d2452dfd8a91b6a36bccab37deb9bffe9053a4b9bcc4e9fff9ef02924@group.calendar.google.com&ctz=Europe/Warsaw&ref=blog.arbitrum.foundation) and [community events](https://arbitrum.foundation/events?ref=blog.arbitrum.foundation) ### Builder's Block #007 - Solidity's Rebuild, Fusaka Upgrade & ERC-8004 URL: https://blog.arbitrum.foundation/builders-block-007-soliditys-rebuild-fusaka-upgrade-erc-8004/ Last updated: 2025-12-04T14:12:01.000Z 💡 ****What's Important This Week** 🚂 Fusaka is now live. The wait is over! 🧬 Solidity's rebuild: Meet the new implementation ⚡ Real-time ZK proving is finally here ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### Fusaka: Ethereum's next major upgrade ![G63HAHtXgAEKGoP.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/G63HAHtXgAEKGoP.jpeg) Fusaka (Fulu + Osaka) combines PeerDAS scalability and native mobile security. Check the new upgrades: - **For Rollup Devs**: [PeerDAS](https://eips.ethereum.org/EIPS/eip-7594?ref=blog.arbitrum.foundation) & [Elastic Blobs](https://eips.ethereum.org/EIPS/eip-7892?ref=blog.arbitrum.foundation) decouple data capacity to slash fees (introduces "sampling") and dynamically scale throughput. - **For DeFi Devs**: [Based Preconfirmations](https://eips.ethereum.org/EIPS/eip-7917?ref=blog.arbitrum.foundation) & [Gas Caps](https://eips.ethereum.org/EIPS/eip-7825?ref=blog.arbitrum.foundation) enable sub-second "instant" UX and prevent single-tx block monopoly. - **For Wallet & Infra Devs**: [Native Passkeys](https://eips.ethereum.org/EIPS/eip-7951?ref=blog.arbitrum.foundation) via secp256r1 & [eth\_config](https://eips.ethereum.org/EIPS/eip-7910?ref=blog.arbitrum.foundation) unlock Secure Enclave signing and standardized node ops. - **For Protocol Devs**: [60M Gas Limit](https://eips.ethereum.org/EIPS/eip-7935?ref=blog.arbitrum.foundation) & [CLZ Opcode](https://eips.ethereum.org/EIPS/eip-7939?ref=blog.arbitrum.foundation) double L1 capacity and optimize heavy cryptographic operations. Also includes: [History expiry](https://eips.ethereum.org/EIPS/eip-7642?ref=blog.arbitrum.foundation) for lighter nodes, [MODEXP repricing](https://eips.ethereum.org/EIPS/eip-7883?ref=blog.arbitrum.foundation), and max block size [limits](https://eips.ethereum.org/EIPS/eip-7934?ref=blog.arbitrum.foundation). âžĄïž [Fusaka Roadmap Here](https://ethereum.org/es/roadmap/fusaka/?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### Solidity faces a full rebuild The team behind Solidity maintenance has posted a new prototype called *Core Solidity*, which introduces a rebuild of the Solidity type system and compiler to improve compiler correctness, empower library authors, and expand the capabilities of analysis tooling. new language features Core Solidity takes ideas from pure functional and modern programming languages (e.g., Haskell, Lean, Rust, Zig). New features include: - Algebraic datatypes (also known as sum/ product types) and pattern matching - Generics/parametric polymorphism - Traits/type classes - Type inference - Higher-order and anonymous functions - Compile-time evaluation [Check the announcement ](https://www.soliditylang.org/blog/2025/11/14/core-solidity-deep-dive/?ref=blog.arbitrum.foundation) ### Scaffold Stylus has a new Chainlink integration The best template for starting your Stylus project now includes a new feature. Check out Chainlink Verifiable Randomness on Stylus. âžĄïž [Try it with a single command](https://www.scaffoldstylus.com/?ref=blog.arbitrum.foundation) ### Nitro v.3.9.3 fixes Gas Target & Pricing Framework Nitro v.3.9.3, which introduces ArbOS 51, is optional on mainnet, but ArbSepolia node operators must upgrade before this activation to continue syncing the chain. âžĄïž [Check the release](https://github.com/OffchainLabs/nitro/releases/tag/v3.9.3?ref=blog.arbitrum.foundation) --- ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* ### ERC-8004: The agentic economy is coming onchain AI on Arbitrum has a promising future. We recommend this 5-minute read about trust-minimized agent registries and how Stylus unlocks onchain validation for AI agents. âžĄïž [Read the blog](https://blog.arbitrum.foundation/ai-on-arbitrum-establishing-an-agent-registry-with-erc-8004-2/) ### Ethereum Foundation presents OpenAC OpenAC is an anonymous credential design purposely constructed to be compatible with the European Digital Identity Architecture. âžĄïž [Read the whitepaper](https://github.com/privacy-ethereum/zkID/blob/main/paper/zkID.pdf?ref=blog.arbitrum.foundation) ### Fortune Cookie Mini-App w/ Farcaster + Arbitrum Are you interested in minting your own fortune cookie? Be sure to check out our contributor's Farcaster mini-app, which is deployed on Arbitrum. Curious about how it's coded? Don't let learning be a mystery. âžĄïž [Check out the code here](https://github.com/hummusonrails/holiday-fortune-cookie?ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### SP1 Hypercube proves 99.7% of Ethereum blocks in real time Succinct, an exclusive Arbitrum Partner, has unveiled a breakthrough in zero-knowledge tech, introducing real-time proving capabilities that promise to democratize proof generation and maintain liveness and a censorship-resistant network. âžĄïž [Read the Thread on X](https://x.com/SuccinctLabs/status/1990764341264855356?ref=blog.arbitrum.foundation) ### Post-Quantum Resistant messaging with Session on Arbitrum ![v2v3.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/v2v3.jpg) This move brings post-quantum cryptography to onchain communication, ensuring future-proof privacy for users. âžĄïž [Read about Session Protocol](https://getsession.org/blog/session-protocol-v2?ref=blog.arbitrum.foundation) ### Reminder: $10M Audit Program Security is key. Applications are open for the Audit Program, an accelerator for your launch timeline that subsidizes security reviews and helps developers ship battle-tested contracts. âžĄïž [Apply now](https://tally.so/r/3xzEzv?program=aap&ref=blog.arbitrum.foundation) ### Reminder: ArbiFuel Don't miss out on Arbifuel. This adoption accelerator provides gas sponsorship to help projects scale effectively, removing friction for users and improving the onboarding experience. âžĄïž [Apply now](https://airtable.com/appzb4GfqGfrnDXjW/shrulGIIp6l6ezAlt?ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### ArbiVerse Highlights in Buenos Aires Missed the action? Catch up on the energy from ArbiPanadas, the insights from ArbiVerse, and all the key takeaways from DevConnect in this wrap-up of the week's events. âžĄïž [Read the Thread on X](https://x.com/arbitrum/status/1994496466900193674?ref=blog.arbitrum.foundation) ### ArbiLink Brasil Recap is ready ![G6h_cH6aAAArnXd.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/12/G6h_cH6aAAArnXd.jpeg) The Arbitrum community in Brazil is heating up. Check out the recap from ArbiLink Brasil. âžĄïž [Read the Forum post](https://x.com/arbitrum%5Fpt/status/1992982834601173351?ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### Developers are encouraged to provide feedback on "The Long-term Solidity Roadmap" As you may have seen in the *What's Important This Week* or *Learn & Build* sections, Solidity is undergoing a significant redesign to give developers a better toolkit for the next generation of smart contracts. We invite developers to share their opinions and provide feedback on what they would like to see or what they already appreciate about Solidity. âžĄïž [Read the Forum post](https://forum.soliditylang.org/t/call-for-feedback-the-long-term-solidity-roadmap/3530?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #007\. Thank you for reading, and keep building. Arbitrum Everywhere. ### AI on Arbitrum: Establishing an Agent Registry with ERC-8004 URL: https://blog.arbitrum.foundation/ai-on-arbitrum-establishing-an-agent-registry-with-erc-8004-2/ Last updated: 2025-12-11T05:44:41.000Z From assistants that generate art or write emails to agents that execute DeFi strategies, every week AI tools are used to help automate everyday processes. **What began as isolated helpers is now evolving into connected workflows** capable of completing entire tasks from start to finish, with minimal human input. The next step in that evolution is even more interesting: agent-to-agent communication. Instead of waiting for human prompts, agents are starting to coordinate, exchange information, and make collective decisions. One of the first steps toward solving trust and discoverability is [ERC-8004](https://eips.ethereum.org/EIPS/eip-8004?ref=blog.arbitrum.foundation), a new Ethereum standard proposal that defines **how agents can be registered, discovered, and verified onchain**. ERC-8004 introduces a public registry system, a space where agents can record task results and build a verifiable reputation over time. In this article, we'll analyze the architecture of ERC-8004 and share key insights on **how developers can leverage this new standard to start building** their next-generation applications. ### The Three Pillars of the Agentic Economy: A Conceptual Framework For this agent-to-agent world to operate at scale, three distinct, composable foundations need to be defined: 1. **Communication**: A standardized protocol for agents to interoperate and exchange task-specific information. Google's A2A protocol serves this function. 2. **Payment:** A mechanism for agents to pay and receive payment for services, such as the x402 protocol (which activates the HTTP 402 "Payment Required" status code for onchain transactions). You can learn more in this [curated article](https://blog.arbitrum.foundation/x402-payments-on-arbitrum/). 3. **Trust:** A system for agents to discover each other, verify identities, and build a verifiable reputation. This is the gap that ERC-8004 is designed to fill. ## **The primitive: Do not trust, verify** Imagine Bob, an autonomous LLM agent with delegated funds, searching for another agent to perform a token swap from USDC to ARB. Alice, Bob’s creator, discovers Charlie, a swap agent that claims to optimize trades using Arbitrum’s [*Timeboost* feature](https://www.bitget.com/news/detail/12560604849196?ref=blog.arbitrum.foundation). **Alice chooses Charlie and manually hard-codes the connection between Bob and Charlie**, creating a flow where each time Alice asks for a swap, it is automatically executed through the actors. This works, but only for a while. What happens when new agents appear with better strategies, lower fees, or improved efficiency? In the current setup, **Bob would never know**. The concept of autonomous AI agents coordinating to execute complex tasks creates a critical gap. In a **closed** network, an agent can **trust** that "Agent B" is what it claims to be. In an open, **permissionless** "Agentic Economy," an agent has no such guarantee. This environment demands a public, **verifiable**, and trust-minimized infrastructure for agents to discover, identify, and validate one another before engaging in high-stakes interactions. The logical next step would be to allow Bob to *discover* and *evaluate* new agents dynamically. However, to do this safely, we cannot rely on the current mechanism of "trusting what the publisher claims." We need a system that follows the true onchain principle: "don't trust, verify." This is where **ERC-8004** changes the game. Its fundamental proposal is the creation of a global, **standardized registry**. Thanks to this registry, an agent like Bob no longer depends on a static connection. It can actively query this registry. ### **AI KISSes Blockchain: Breaking Down ERC-8004’s Architecture** The beauty of ERC-8004 lies in the KISS principle: "Keep it simple, stupid." It defines just **three lightweight registries**, yet together they describe a system of discovery, validation, and reputation. 1. **Identity Registry:** This establishes a global, onchain namespace for agents by extending the familiar **ERC-721 (NFT)** standard. Each registered agent is minted as a unique NFT, whose metadata points to different attributes (Agent Card, MCP server, OASF, DID, wallet address, etc). This makes agent identity a unique, ownable, transferable, and verifiable onchain asset. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/carbon-1-1-1.png) Figure 1: Agent Registration file Here you have a code example on how to register (mint) an agent: ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/carbon--4--1-1.png) Figure 2: Solidity interface for IdentityRegistry - **Reputation Registry:** This is a minimal, lightweight interface for posting and fetching attestations. As an agent accepts a task, it’s expected to sign a *feedbackAuth* to authorize the *client* (human or agent) to give feedback. The feedback consists of a *score* (0-100), *tag1* and *tag2* (left to developers’ discretion to provide maximum onchain composability and filtering); t*he standard deliberately leaves* the subjective interpretation of this raw data to a permissionless market of offchain reputation providers. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/carbon--6--1-1.png) Figure 3: Simplified Reputation Registry interface - **Validation Registry:** It provides a standardized framework for requesting and recording independent verification of an agent's work. This registry is "**pluggable**," allowing **validators** to use diverse, modular methods based on the task's security needs. These can range from crypto-economic models like "*stake-secured inference re-execution*," to cryptographic validation using *Trusted Execution Environments* (TEEs), to advanced *Zero-Knowledge Machine Learning (zkML) verifiers*, or even o*ptimistic and social validation* for other tasks. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/carbon--2--1-1-1.png) Figure 4: Validation Registry summarized ### Onchain Validation is for Stylus [Stylus](https://medium.com/@estheraladioche569/arbitrum-stylus-explained-19b6556ce7e2?ref=blog.arbitrum.foundation) introduces a parallel virtual machine (based on WASM) that runs alongside the traditional EVM, allowing developers to write contracts in high-performance languages like Rust and C++. The primary benefits are a dramatic reduction in gas costs for computation and memory. This capability has profound implications for the ERC-8004\. As we've discussed, the standard is intentionally minimal, leaving complex, subjective, and compute-intensive tasks (like reputation scoring and deep validation) to the application layer. On the standard EVM, this means most of a "validator's" heavy lifting *might* happen offchain, with the blockchain only acting as a simple registry or "proof-anchoring" layer. Here are two core examples of what this enables: - **Reputation Algorithm**: Calculating a real, trustworthy reputation requires running complex, weighted algorithms (like [EigenTrust](https://docs.openrank.com/reputation-algorithms/eigentrust?ref=blog.arbitrum.foundation)) to filter this noise. Now is the moment for a Stylus solution that reads recent attestations from the Reputation Registry and executes a sophisticated graph analysis or trust algorithm to filter noise and score the agent's reputation. Clients (like Bob's agent from our earlier example) could then **query this onchain score** instead of relying on a raw, trusted offchain record. - **Onchain validation:** On the standard EVM, a validator contract is computationally restricted and limited to "proof-anchoring", where the real validation happens offchain and only the result is posted onchain. Now we can use Stylus for these compute-intensive tasks, like verifying a complex zkML proof, re-running lightweight models, and combining this logic with slashing mechanisms on the agent's staked collateral. This transforms the Validation Registry from a simple anchoring system into a true **"onchain verifiable execution"** system. ### Critical Challenges & Building Opportunities ERC-8004 is a minimal standard by design, leaving sophisticated implementations to the application layer. This means the ecosystem builders can empower this modular architecture and **manage the complexity** to order to improve security and decentralization. The [standard](https://eips.ethereum.org/EIPS/eip-8004?ref=blog.arbitrum.foundation) is still under review and is a [hot topic](https://ethereum-magicians.org/t/erc-8004-trustless-agents/25098?ref=blog.arbitrum.foundation) among the community builders. This means it's the moment to build solutions on top to address potential critical challenges: - **The Sybil Problem:** The standard lacks a native defense against "duplication," where an attacker mass-registers agents to collude and inflate their reputations. - **Transferable Reputation Risk:** Since the ERC-721 identity is transferable, a malicious actor could buy a high-reputation agent and replace its honest code with a fund-draining script. - **Privacy Concerns:** The public nature of the registry could expose sensitive data about client tasks or proprietary agent strategies. - **The "Past Performance" Fallacy:** As the financial disclaimer goes, *"past performance is no guarantee of future results."* A good onchain reputation is a historical data point, not a promise an agent won't fail. Solving these challenges—building complex Sybil filters, robust validator agents with slashing mechanisms, or a privacy-preserving layer for reputation registries—could possibly be blocked by high onchain gas costs. This is the exact barrier where execution environments like **Arbitrum's Stylus** are designed to break. It makes these compute-intensive solutions economically viable onchain for the first time. We would love to hear more ideas where Stylus could help enhance the decentralization and security of ERC-8004\. What ideas sparked in your mind while reading the article? **My** [**DMs are open**](https://x.com/blockbyvlog?ref=blog.arbitrum.foundation)**, keen to talk about you ideas and hear what you're building đŸ€** ## **The Foundation for a Verifiable Agent Economy** **ERC-8004 is a foundational primitive for AI**. By design, it is a lightweight standard that provides the essential, "trust-minimized rails" for an open machine economy. It elegantly solves the problem of agent identity, ownership, and discovery, while intentionally leaving the complex, subjective tasks of reputation scoring and validation specific to the agents' purpose. This is where its synergy with Arbitrum Stylus becomes so powerful. It can provide the compute engine and the tools to mitigate the critical challenges and build the *next* layer of applications, starting with fully-fledged validators, incentives, and slashing mechanisms. Together, these technologies lay a robust foundation for the next generation of trustless, autonomous, and economically viable AI onchain. ### Builder's Block #006 - Arbitrum Update on L2 Privacy and Devconnect Key Takeaways URL: https://blog.arbitrum.foundation/builders-block-006-arbitrum-update-on-l2-privacy-and-devconnect-highlights/ Last updated: 2025-11-20T17:39:28.000Z 💡 ****What's Important This Week** đŸ„· ****Privacy is not optional anymore** \- Explore zk, FHE and more. đŸ‡ŠđŸ‡· ArbiVerse Took Over ****Devconnect** ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* ### ArbiVerse Recap at Devconnect Buenos Aires ![arbiverse-agenda.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/arbiverse-agenda.jpeg) - **Tech Innovations & Infrastructure:** We explored **Universal Intents** and **ZK** integration for true interoperability. Sessions on **FHE** rails, **Timeboost**, and **custom Arbitrum Chains** highlighted the future of high-performance infrastructure. - **Ecosystem & Builder Tooling:** Builders focused on shipping with Solidity and **Stylus** guides. We also covered the financial layer through **RWAs**, **stablecoin** evolution, and the power of grassroots innovation. âžĄïž [Watch the Full ArbiVerse Session](https://x.com/arbitrum/status/1991191437518729684?s=48&t=vXG2ElJMQI%5FC0ORdty5wOw&ref=blog.arbitrum.foundation) Here is the agenda to help you get right to what you’re interested in: - 00:36 - Arbitrum Everywhere overview - 34:30 — Redstone Oracles & Stylus integration progress - 59:20 — Panel: Deploying on Arbitrum One vs. launching your own Chain - 01:35:00 — Workshop: Building private AI Agent payment flows - 01:58:00 — Fireside Chat: ZK proofs coming to Arbitrum - 02:22:52 — Workshop: Refactoring contracts for FHE with Fhenix - 02:54:14 — Building your first Farcaster Miniapp - 03:22:47 — Multichain technical implementation with Wormhole - 03:54:54 — Panel: Challenges of Stylus adoption in a Solidity world ## 📚 Learn & Build *This week, the key themes for builders are clear: Privacy and Cross-Chain Interoperability. These two pillars not only are dominating Devconnect 2025, but also represent critical frontiers for L2 innovation heading into 2026* ### Highlights from Arbitrum’s Privacy Open Space on Smart Contract Confidentiality ![Screenshot 2025-11-19 at 10.50.12.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/Screenshot-2025-11-19-at-10.50.12.png) The Privacy Open Space hosted by Arbitrum brought together builders pushing the boundaries of privacy on Ethereum. Topics included Anonymity vs. Confidentiality, smart contract encryption via FHE, multi-party computation (MPC), compliance-ready privacy, and use cases in gaming, payments, and insurance. âžĄïž [Listen to the Space](https://x.com/i/spaces/1OwGWePdnVkxQ?s=20&ref=blog.arbitrum.foundation) ### "The Arbitrum Thesis” - A Builder’s Take by Hunter In this community-made video, OCL contributor Hunter breaks down his take on long-term vision for Arbitrum. A must-watch for new builders and DAO participants looking to understand the ethos driving the ecosystem. âžĄïž [Watch on YouTube](https://www.youtube.com/watch?v=Wpky8%5F-Cosc&ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* ### Messari Unpacks the Arbitrum Thesis in a New Report The piece offers a comprehensive look at what the Arbitrum Everywhere framework means in practice for builders, enterprises, DeFi teams, and the DAO. With rich charts, case studies, and data-driven insights, this report is a standout resource for anyone following the ecosystem’s growth. âžĄïž [Check the report](https://messari.io/report/arbitrum-everywhere-beyond-the-limits?ref=blog.arbitrum.foundation) ### Curvy v2 Launches Stealth Address Aggregator for Private Onchain Fund Management ![Curvy V2 on Arbitrum](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/Screenshot-2025-11-19-at-10.51.19.png) Curvy’s latest release on Arbitrum introduces zk-enabled stealth aggregation for private asset control. Users can now manage and split funds via zero-knowledge tech while preserving confidentiality and composability. âžĄïž [Explore Curvy v2](https://x.com/0xCurvy/status/1987888567306076479?s=20&ref=blog.arbitrum.foundation) ### Symphony Makes x402 Payments Fully Cross-Chain Symphony became the first protocol to enable fully interoperable x402 payments across chains using Arbitrum. âžĄïž [Read the Thread on X](https://x.com/arbitrum/status/1988334204229480495?s=20&ref=blog.arbitrum.foundation) ### Allora Network Brings Onchain Machine Learning to Arbitrum ![allora on arbitrum](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/allora.jpeg) Allora Network has launched its decentralized AI protocol on Arbitrum, enabling dApps to plug into live prediction feeds and onchain intelligence. Use cases include AI-powered oracles and dynamic price markets. âžĄïž [Learn more about Allora](https://x.com/AlloraNetwork/status/1989031377942331682?s=20&ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* ### Arbitrum Bridge Plugin Unlocks Seamless Cross-Chain UX The Arbitrum Bridge Plugin, demoed by Conuity at X402, enables developers to integrate cross-chain token bridging directly into their dApps. Through an embedded iframe widget, users can bridge assets across chains without leaving the app interface. âžĄïž [Try the UX plugin](https://playground.arbitrum.io/bridge?ref=blog.arbitrum.foundation) ### Scaffold-ETH x Arbitrum: dApp Prototyping on L2 If you're a developer, save time by **leveraging** this popular Ethereum development framework. âžĄïž [Explore the repo](https://github.com/scaffold-eth/scaffold-eth?ref=blog.arbitrum.foundation) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* ### Nov 21st - Let's wrap up DevConnect with ArbiPanadas ![arbipanadas.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/arbipanadas.jpeg) When & Where: ⏰ Friday Nov 21st 📍 Buenos Aires, Argentina đŸ—“ïž RSVP required âžĄïž [Register NOW](https://luma.com/ArbiPanadas-BuenosAires?ref=blog.arbitrum.foundation) ### Devconnect Reveals Future of Ethereum: Privacy, AI, Interop, and Governance From Buenos Aires to the world: Devconnect 2025 is packed with future-facing topics for the Ethereum ecosystem. - **Privacy**: zk, FHE, and encrypted smart contracts took center stage. - **Interoperability**: L2s aligned on messaging standards and shared sequencing. - **AI & Infra**: DePIN and onchain AI featured heavily. - **Governance**: Scaling DAOs, coordination tooling, and regulatory UX were hot topics. âžĄïž [Check the full agenda](https://devconnect.org/calendar?ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* ### Ed Felten Sheds Light on Multi-Constraint L2 Pricing Model on Arbitrum Ed Felten opened the discussion of a flexible pricing framework balancing network inclusion, fairness, and congestion across Layer 2 chains. A must-read for Arbitrum DAO participants and protocol economists. âžĄïž [Read the Forum post](https://research.arbitrum.io/t/multi-constraint-pricing/9782?ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #006\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Builder's Block #005 - Arbiverse, DevConnect & x402 in a Nutshell URL: https://blog.arbitrum.foundation/builders-block-005-arbiverse-devconnect-x402-in-a-nutshell/ Last updated: 2025-11-06T15:15:03.000Z 💡 ****What to try this week** ****⚒** Build the next wave of payment apps with the x402 guide 💾 Apply for $500K in funding for your Arbitrum project ****đŸ‡ŠđŸ‡·** Get ready with us for DevConnect Argentina ## 📣 Announcements *Key updates from the Arbitrum ecosystem and the Foundation.* **‱ $500K in funding to build your project** ![Alliance.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/image-1.png) Take your Arbitrum project to the next level with crypto's top accelerator. Alliance launched the ALL16 program, and the deadline is about to expire, hurry up and apply to innovate on-chain! âžĄïž [Apply now](https://alliance.xyz/apply?utm%5Fsource=builder-block&utm%5Fmedium=website&utm%5Fcampaign=devrel-q4) **‱ Security Council Member Election Results** ![election.jpeg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/election.jpeg) The September 2025 Security Council Election has concluded! 🎉 Six new members have been elected to help safeguard the Arbitrum ecosystem and uphold the DAO’s governance integrity. The grace period is underway until Nov 21 - this allows the election results to register with the Security Council contracts across relevant chains. âžĄïž [Learn More about Security Council Elections](https://x.com/arbitrumdao%5Fgov/status/1985684436260643084?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) **‱ Onchain history - Arbitrum One Surpasses 2 Billion Transactions** Reaching this milestone marks a key moment of maturity for the Arbitrum ecosystem and highlights the robustness of its infra (sequencer, roll-up batching and data availability). At the same time, it crossed **$400B in swap volume on Uniswap** — meaning Arbitrum is the place for **deep liquidity**. âžĄïž [CoinLaw Arbitrum Statistics 2025](https://coinlaw.io/arbitrum-statistics/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* **‱ x402 Payments on Arbitrum — Build the next wave of payment apps** Dive into our x402 breakdown packed with actionable insights for developers working on next-gen cross-chain communication. Check out the full article and explore the x402 repository linked below. âžĄïž [Learn more about x402](https://blog.arbitrum.foundation/x402-payments-on-arbitrum/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) **‱ RedStone Pushes Oracle Performance Further with Arbitrum Stylus** ![1125_Arbitrum_Redstone_CaseStudy_R2.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/1125_Arbitrum_Redstone_CaseStudy_R2.jpg) RedStone has deployed a new oracle implementation on Arbitrum Stylus, showcasing significant efficiency gains for onchain data feeds. Up to 34% lower computational overhead and 50% cheaper per-feed costs compared to traditional EVM-based implementations. âžĄïž [Learn from Restone what’s to come for blockchain infrastructure](https://blog.arbitrum.io/how-redstone-is-advancing-oracle-capabilities-with-stylus/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) **‱ Particle Network Refreshes Arbitrum Integration Docs** Particle Network has released an updated version of its documentation with improved integration steps for wallets and account abstraction (AA) flows on Arbitrum. The refresh introduces clearer guidance on implementing Universal Accounts (UA) — Particle’s infrastructure that enables chain-agnostic user experiences. With Universal Accounts, users can seamlessly interact with your Arbitrum dApp even if their assets reside on another chain, simplifying cross-chain onboarding and wallet management. âžĄïž [Learn how to make your Arbitrum dApp shared across chains](https://docs.arbitrum.io/for-devs/third-party-docs/Particle/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* **‱ Boros launches on Arbitrum One** ![boros.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/boros.png) Built by the Pendle Finance team, Boros introduces a novel derivative market focused on trading funding rates (e.g., BTC/USDT and ETH/USDT) onchain. âžĄïž [Learn how to capture yield and volatility with Boros](https://nitter.net/boros%5Ffi/status/1983516409000063116?ref=blog.arbitrum.foundation#m?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) **‱ Capx Chain goes live on Arbitrum** Capx AI has launched its mainnet infrastructure on the Arbitrum Orbit stack as an L2 tailored for tokenizing, trading, and building AI-native applications âžĄïž [Dive into the infrastructure powering the AI App Economy](https://thedefiant.io/news/defi/capx-ai-the-people-s-nasdaq-for-ai-apps-goes-mainnet-with-infra-secured-by-usd220m?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* **‱ Nov 22: ETH/ACC — Founder & Builder Meetup in Buenos Aires** ![arbiverse.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/arbiverse.jpg) The ETH/ACC Founder & Builder Meetup invites developers, founders, investors, and ecosystem partners to connect and share insights ahead of upcoming Ethereum events. When & Where: ⏰ Saturday Nov 22nd 📍 La Rural, Buenos Aires đŸ—“ïž RSVP required âžĄïž [Register NOW](https://luma.com/2dmmtz78?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) **‱ Nov 20: Offchain Labs Frontier Forum - Where Moonshot Ideas Take Off** Join Chase Allred, Partnerships Manager at Offchain Labs. When & Where: ⏰ Thursday Nov 20th 📍 Planetario Galileo Galilei, Buenos Aires đŸ—“ïž RSVP required âžĄïž [Register NOW](https://luma.com/sy8xe86a?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) **‱ Nov 19: ArbiVerse is coming to Devconnect in Buenos Aires** ![arbi.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/11/arbi.png) Join us for Arbitrum’s massive flagship event with interactive builder showcases, talks, fun mini games, live music and food. And there's more! When & Where: ⏰ Wednesday Nov 19th 📍 La Rural, Buenos Aires đŸ—“ïž RSVP required âžĄïž [Register NOW](https://luma.com/ArbiVerseBuenosAires?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) **‱ Nov 18: DuneCon 2025 — Data, Insights, and Onchain Innovation** Hear from Steven Goldfeder, CEO and Co-Founder of Offchain Labs, at DuneCon 2025. When & Where: ⏰ Monday Nov 18th 📍 Buenos Aires đŸ—“ïž Tickets required âžĄïž [Get tickets](https://dune.com/dunecon?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) **‱ Nov 13: Offchain Labs at ETHGlobal Devconnect — Building Farcaster Mini-Apps with Arbitrum** Join Hunter Brea, Senior Community Strategist at Offchain Labs, for a hands-on session exploring how to build Farcaster Mini-Apps powered by Arbitrum. Perfect for devs curious about onchain social and creative apps. When & Where: ⏰ Wednesday Nov 13th 📍 Devconnect main venue - Workshop space (Yellow Pavilion) đŸ—“ïž RSVP required âžĄïž [Register NOW](https://devconnect.buidlguidl.com/?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* The ArbitrumDAO is actively evolving its governance tooling, incentive systems, and delegate transparency. **‱ OCL Proposal on L2 Gas Pricing Constraints** Offchain Labs (OCL) has initiated a discussion around new gas pricing constraints on Layer 2 networks, sparking debate on efficiency, fairness, and decentralization. As this proposal evolves, it raises important questions about how fee mechanisms should balance user affordability, network security, and economic sustainability. âžĄïž [Read the Forum Thread](https://forum.arbitrum.foundation/t/aip-raise-the-gas-target-implement-improvements-to-the-pricing-algorithm/30182?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) **‱ AI Tooling for Governance via Tally** A working thread invites community input on how AI-driven features could enhance the governance experience in the ArbitrumDAO. âžĄïž [Read the Forum Thread](https://forum.arbitrum.foundation/t/open-discussion-ai-tooling-for-governance-via-tally/27321?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) **‱ L2BEAT Delegate Communication Thread** L2BEAT describes itself as an “independent, public-goods company committed to verification and fact-checking of Layer 2 claims." They provide regular updates on their voting activity, rationale behind votes, and other ongoing discussions. âžĄïž [Read the Forum Thread](https://forum.arbitrum.foundation/t/l2beat-delegate-communication-thread/15979?utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=devrel-q4) --- That’s all from Builder’s Block #5\. Thank you for reading, and keep building. Arbitrum Everywhere. ### x402 Payments on Arbitrum URL: https://blog.arbitrum.foundation/x402-payments-on-arbitrum/ Last updated: 2025-12-10T16:24:22.000Z If your feed has been buzzing with mentions of **x402** and you’re wondering what the excitement is about, you’re not alone. Even token listing sites are adding an x402 token category, but behind the memes and the hype is a genuinely interesting protocol that could change how we think about payments on the web. Let's break it down. ## **The missing HTTP status code gets a job** Developers have long known about `HTTP 402: Payment Required`, a status code that has existed for years but has never had a standardized implementation. The[ x402 protocol](https://www.x402.org/?utm%5Fsource=blog&utm%5Fmedium=blog&utm%5Fcampaign=devrel-q4) finally gives it a purpose: a standardized way to request, verify, and settle onchain payments directly through the web's native request-response cycle. Instead of integrating with third-party billing systems or managing API keys, x402 lets a client and server negotiate and complete a payment using standard HTTP headers. ### How it works Imagine you run an API that sells access to up-to-date weather information, or the latest sentiment scores on crypto trends for a few cents per request. Usually, you'd need user accounts, API keys, and a full billing setup. With x402, that entire flow can happen without any of that. Here's what that looks like: 1. The **client** (e.g., the user) requests a resource as usual. 2. The **server** (e.g., your API) responds with a `402 Payment Required`, including a JSON object describing accepted payment options like network, token, price, and pay-to address. 3. The **client** builds a `Payment Payload`, signs it with their wallet, and retries the request with an `X-PAYMENT` header. 4. The **server** verifies the payment locally or through a **facilitator** **service** (e.g., trusted payment relay) using a `/verify` endpoint. 5. If valid, the **server** fulfills the request and returns a `200 OK` HTTP status with an `X-PAYMENT-RESPONSE` header containing settlement details. 6. The **facilitator** then settles the payment onchain. Below is a simple diagram of the process: ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/x402-payment-flow.png) ## Beyond payments: composability and autonomy What makes x402 compelling isn't just the flow, but what it enables. By embedding payment negotiation into HTTP itself, any API, agent or application can become a paid service without relying on a centralized payment processor. It introduces value exchange as a native web primitive, rather than a proprietary product feature. That means: - APIs can charge per request without OAuth or dashboards. - AI agents can pay other agents automatically for services. - Users can interact with paid resources directly from their browsers with one click. Together, it creates a more composable, programmable, and open web. It brings us a step closer to a machine-to-machine economy. ## Try it yourself I've published a working demo showing how x402 can handle batch payments for a private AI service, using [Google's AP2 protocol](https://cloud.google.com/blog/products/ai-machine-learning/announcing-agents-to-payments-ap2-protocol?ref=blog.arbitrum.foundation) for signed payment intents and Arbitrum for final onchain settlement. You can explore it here: [GitHub - hummusonrails/x402-demo-arbitrumContribute to hummusonrails/x402-demo-arbitrum development by creating an account on GitHub.![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/icon/pinned-octocat-093da3e6fa40-7.svg)GitHubhummusonrails![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/thumbnail/x402-demo-arbitrum-4)](https://github.com/hummusonrails/x402-demo-arbitrum?utm%5Fsource=blog&utm%5Fmedium=blog&utm%5Fcampaign=devrel-q4) x402 is more than a clever revival of an old HTTP status code. It's a bridge between web protocols and blockchain. By bringing payments into the fabric of the web itself, it opens a new design space for builders who want to make the web programmable, not just readable and writable, but payable. ### Builder's Block #004 - Get your security audit subsidized, Bobcat SDK & Arbiverse URL: https://blog.arbitrum.foundation/builders-block-004-get-your-security-audit-subsidized-bobcat-sdk-arbiverse/ Last updated: 2025-10-23T16:00:13.000Z 💡 ****What to Try This Week** 🩀 Spin up a Rust-based Stylus contract using the live demo 🔒 Apply for the Arbitrum Audit program to get your audit subsidized 🎓 Enroll in the Stylus Bootcamp for in-depth training ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* **‱ $10m Arbitrum Audit Program still LIVE** [![G21ESOGaAAAosLv.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G21ESOGaAAAosLv.jpg)](https://tally.so/r/3xzEzv?program=aap&ref=blog.arbitrum.foundation&utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=) A new audit fund — $10 million in ARB — is available for top-tier smart-contract audits over the next year. Applications rolling. âžĄïž [Apply now](https://tally.so/r/3xzEzv?program=aap&ref=blog.arbitrum.foundation&utm%5Fsource=builder-block&utm%5Fmedium=newsletter&utm%5Fcampaign=) **‱ Node Operators: Sepolia Hard-Fork Guidance** As part of the Fulu consensus node upgrade in Fusaka, Ethereum’s PeerDAS (EIP-7594) will be activated. Node operators for Layer 2 networks, such as Arbitrum One and other Arbitrum L2 chains, will need to make sure they connect to a L1 Ethereum Beacon Chain Node that is subscribed to all subnets in order for the Nitro node software to function properly. âžĄïž [Check the details](https://arbitrum.notion.site/EXT-Comms-Breaking-Change-Notice-L1-Beacon-Chain-Node-in-Fusaka-Subscribe-To-All-Subnets-28401a3f59f880d68e83ce2779b79ce3?ref=blog.arbitrum.foundation) ## 📚 Learn & Build *New learning drops and hands-on resources from across the Arbitrum ecosystem.* **‱ How to Make a Solidity Contract 100x Cheaper and Faster** Learn how to offload compute-heavy logic to WASM/Rust while keeping full EVM composability. [![0925_Arbitrum_StylusSolidityContract_Blog_R1_option2-1.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/0925_Arbitrum_StylusSolidityContract_Blog_R1_option2-1-1.jpg)](https://blog.arbitrum.foundation/how-to-make-a-solidity-contract-100x-cheaper-and-faster/) âžĄïž [Read the article](https://blog.arbitrum.foundation/how-to-make-a-solidity-contract-100x-cheaper-and-faster/) **‱ A quick read on the tools and integrations helping you build faster on Arbitrum with Stylus and Thirdweb** [![1025_Thirdweb_CaseStudy_Blog_R3.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/1025_Thirdweb_CaseStudy_Blog_R3.jpg)](https://blog.arbitrum.io/how-thirdweb-uses-arbitrum-stylus-to-power-the-next-wave-of-onchain-apps/?ref=blog.arbitrum.foundation) Learn how Thirdweb Uses Arbitrum Stylus to Power the Next Wave of Onchain Apps. âžĄïž [Read the article](https://blog.arbitrum.io/how-thirdweb-uses-arbitrum-stylus-to-power-the-next-wave-of-onchain-apps/?ref=blog.arbitrum.foundation) **‱ Build the Next Generation of Dapps on Arbitrum with Arbitrum Stylus via Lava RPC** [![G1ssJY2XoAAyiRI.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G1ssJY2XoAAyiRI.png)](https://www.youtube.com/watch?v=9pvCE-LfDP4&ref=blog.arbitrum.foundation) In the video you’ll learn how Arbitrum Stylus lets you write contracts in Rust and other languages, how to deploy an ERC20 token and interact with it via a dapp, and how Lava RPC powers contract deployment, minting, transfers, and receipts. âžĄïž [Watch the video](https://www.youtube.com/watch?v=9pvCE-LfDP4&ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* **‱ Ethereal's Mainnet Alpha is now live** [![ethereal_mainnet_live_frame.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/ethereal_mainnet_live_frame.png)](https://x.com/etherealdex/status/1980687756633448814?ref=blog.arbitrum.foundation) As a USDe-native perps dex, they’ll be building out a financial ecosystem with an ultra fast perps experience with 100ms block times and direct access to deep liquidity as an L3 on Arbitrum One. âžĄïž [Check out Ethereal](https://x.com/etherealdex/status/1980687756633448814?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* **‱ Introducing Bobcat SDK, a TINY (3x smaller than Stylus SDK) community owned SDK for Rust Arbitrum Stylus** This SDK accomplishes gas savings by reducing the amount of abstractions in the SDK, using host features for checked math, not using the allocator by default, and many other changes. âžĄïž [Check out the SDK](https://stylus-saturdays.com/p/introducing-bobcat-sdk-a-tiny-3x?ref=blog.arbitrum.foundation) **‱ The Nitro 3.7.6 release contains a fix to support the new blobs endpoint from Ethereum Consensus Layer (CL) clients.** For teams who upgraded their batch posters to 3.8.0-rc8 or accidentally upgraded their RPC nodes to 3.8.0-rc8, we recommend 3.8.0-rc9. We still strongly recommend teams who are on 3.7.x to stay on 3.7.x because 3.8.0-rc9 is not fully tested and introduces a database schema migration. âžĄïž [Read the full thread](https://x.com/ArbitrumDevs/status/1978275306755539231?utm%5Fsource=chatgpt.com) **‱ New Scaffold-Stylus version released** [![G37ZZQ9XIAAzwbo.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G37ZZQ9XIAAzwbo.jpg)](https://www.scaffoldstylus.com/?ref=blog.arbitrum.foundation) The latest version is live with major updates across ScaffoldStylus hooks, OpenZeppelin-Stylus, and docs. Installation is now simpler with stylusup, plus refreshed ERC721 and VRF extensions. âžĄïž [Check out Scaffold-Stylus](https://www.scaffoldstylus.com/?ref=blog.arbitrum.foundation) **‱ With ArbOS 40, Arbitrum supports EIP-7702, bringing native Account Abstraction onchain - solving longstanding challenges that have hindered builders** [![1025_Arbitrum_AccountAbstraction_Blog_option2.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/1025_Arbitrum_AccountAbstraction_Blog_option2-1.jpg)](https://blog.arbitrum.foundation/the-smartest-wallet-you-already-own-is-on-arbitrum/) âžĄïž [Read the article](https://blog.arbitrum.foundation/the-smartest-wallet-you-already-own-is-on-arbitrum/) --- ## đŸ—“ïž Events *Workshops, hackathons, and ecosystem meetups to watch.* **‱ Nov 19: ArbiVerse is coming to Devconnect in Buenos Aires** [![G34KV8laAAAo5KJ.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G34KV8laAAAo5KJ-1.png)](https://luma.com/ArbiVerseBuenosAires?ref=blog.arbitrum.foundation) Join us on Nov 19 for Arbitrum’s massive flagship event with interactive builder showcases, talks, fun mini games, live music and food. And there's more! âžĄïž [Sign up now](https://luma.com/ArbiVerseBuenosAires?ref=blog.arbitrum.foundation) **‱ Oct 24-26: Arbitrum is proud to be sponsoring Encode Club’s London Hackathon** [![G3xckSLa4AACwUM.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G3xckSLa4AACwUM.jpg)](https://www.encodeclub.com/programmes/encode-london-2025?ref=blog.arbitrum.foundation) $4,000 in prizes up for grabs! Our challenge: Build AI-to-AI payments on Arbitrum. Use open standards like AP2 and x402 to create agents that: ‱ Request and authorize payments ‱ Complete transactions autonomously ‱ Settle seamlessly on Arbitrum âžĄïž [Apply now](https://www.encodeclub.com/programmes/encode-london-2025?ref=blog.arbitrum.foundation) **‱ Oct 27: Stylus Bootcamp (4-Week Training) — RareSkills × Offchain Labs** [![G26NABSacAAcbQR.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G26NABSacAAcbQR.jpg)](https://rareskills.io/stylus-bootcamp?ref=blog.arbitrum.foundation) Intensive hands-on Rust-on-Stylus program for experienced Solidity / Rust devs. Next cohort starts October 27th. âžĄïž [Sign up now](https://rareskills.io/stylus-bootcamp?ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* **‱ DVP Quorum Snapshot ends with majority support** This proposal aimed to collect community sentiment on the delegated voting power (DVP) based quorum model. Voting ended with 157.4M ARB voting FOR and only 16.8M ARB voting AGAINST. âžĄïž [Read up on the proposal](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth/proposal/0xc5f06144fa92aaff99e0e44482ab6f7a3f6486dfb6c854d16271399ffcf895e6) **‱ Arbitrum Gaming Ventures (AGV) Council reissues Snapshot** The AGV Council seeks DAO approval for an updated compensation framework for future councils. âžĄïž [Read up on the proposal](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth/proposal/0xc5f06144fa92aaff99e0e44482ab6f7a3f6486dfb6c854d16271399ffcf895e6) **‱ The DAO Incentive Program (DIP 2.0) put forth by AF is collecting community feedback** âžĄïž [Read up on the proposal](https://forum.arbitrum.foundation/t/the-dao-incentive-program-dip-2-0/30080?ref=blog.arbitrum.foundation) **‱ Onchain Proposal: Transfer 8,500 ETH from the Treasury to ATMC’s ETH Treasury Strategies** Entropy’s proposal to transfer 8500 ETH to the Arbitrum Treasury Management Committee (ATMC)’s ETH strategies is undergoing onchain voting. The voting commenced Oct 17 and will end in \~2 weeks. âžĄïž [Check out the proposal](https://www.tally.xyz/gov/arbitrum/proposal/57495998481040869152703890521939307107269690440073097268210566577740258992963?govId=eip155:42161:0x789fC99093B09aD01C34DC7251D0C89ce743e5a4&ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #004\. Thank you for reading, and keep building. Arbitrum Everywhere. ### The Smartest Wallet You Already Own Is on Arbitrum URL: https://blog.arbitrum.foundation/the-smartest-wallet-you-already-own-is-on-arbitrum/ Last updated: 2025-10-22T17:39:31.000Z If you've built on Ethereum or an Ethereum rollup, you may be familiar with an Externally Owned Account (EOA), which is a *basic wallet*: a private key controls the account, allowing it to send transactions but not run arbitrary code. On the other hand, *smart contract accounts* can embed logic, verify signatures, perform batching, sponsor gas, and much more. Account abstraction aims to erase this distinction. Over the years, several approaches have tried to deliver that vision. But fragmentation, complexity, and UX challenges remain. EIP-7702 lets an EOA set a *delegation indicator* that points to smart contract code. That setting persists until it is replaced or cleared by another authorization, so no migration or new account is needed. What's more, Arbitrum has introduced support for EIP-7702 through the [ArbOS 40 upgrade](https://docs.arbitrum.io/run-arbitrum-node/arbos-releases/arbos40?ref=blog.arbitrum.foundation). > ArbOS 40 “Callisto” is now live on Arbitrum One and Nova! > > This upgrade brings new capabilities from [@Ethereum](https://twitter.com/ethereum?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation)’s Pectra hard fork including: > > EIP-7702 (Account Abstraction) > EIP-2537 (BLS Precompile) > EIP-2935 (Block Hash Access) > And a minor Stylus fix for devs > > Let’s dive in 👇 > > — Arbitrum Developers (@ArbitrumDevs) [June 18, 2025](https://twitter.com/ArbitrumDevs/status/1935324657634128296?ref%5Fsrc=twsrc%5Etfw&ref=blog.arbitrum.foundation) This opens up a powerful new layer for account abstraction directly onchain. In this post, we'll walk through how EIP-7702 works, how it compares to existing options, how Arbitrum supports it, and how you, as a developer, can start using it today. ## What is EIP-7702? At its core, EIP-7702 introduces a new transaction type (type 0x04) that lets an EOA set its account code to a *delegation indicator* pointing at smart-contract logic, via an `authorizationList` included in the transaction. The delegation remains in effect until changed or cleared. The transaction fields payload includes the usual fields like nonce, chain, gas fees, calldata, etc., plus: - `**authorizationList**` – an array of `[chainId, address, nonce, yParity, r, s]` tuples authorizing which *code address* the EOA should delegate to. Applying an authorization writes a delegation indicator to the EOA’s code. - **`signature`** fields – the transaction’s own signature proving the EOA owner authorized the overall operation. When the transaction executes, the EOA’s code is set to a delegation indicator that points to the designated contract. That setting persists across transactions. To remove it, you must submit another 7702 authorization that clears the code. The EOA gains smart-account capabilities through the delegated logic, and those remain active until the delegation is changed or cleared. ## How EIP-7702 Fits into Account Abstraction Account abstraction has been an active area of design. To understand where EIP-7702 really lends a role here, it helps to understand other models: - [ERC-4337](https://docs.erc4337.io/?ref=blog.arbitrum.foundation) (UserOps / EntryPoint / Paymaster) - This is currently the dominant pattern for smart contract wallets. It introduces a user operation layer, bundles, paymasters, and other components. It offers rich features, including gas sponsorship, custom validation logic, and batching. However, it also introduces additional infrastructure (bundlers, entry points) and can lead to fragmentation in wallet user experience. EIP-7702 complements ERC-4337 by bringing account-abstraction features directly into the protocol layer, while ERC-4337 continues to operate through UserOps, EntryPoints, and Paymasters. - [EIP-3074](https://eips.ethereum.org/EIPS/eip-3074?ref=blog.arbitrum.foundation) (AUTH / AUTHCALL Opcodes) - EIP-3074 proposed two new opcodes to authorize and execute on behalf of EOAs. It faced resistance due to [various security risks](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-3074.md?ref=blog.arbitrum.foundation#security-considerations) and EVM-level compatibility concerns. EIP-7702 achieves similar goals via a transaction type instead of new opcodes. EIP-7702 isn’t free; it introduces a small gas overhead for handling authorization logic and signature verification. Wallets and applications must also validate which contracts an account can delegate to, since unsafe or malicious authorizations could be exploited. Each authorization entry includes both a `chainId` and a `nonce`, ensuring that signed delegations can’t be replayed across chains or reused multiple times. Once a delegation is applied, it stays in place across future transactions until you explicitly clear or replace it. If a 7702 transaction fails, any delegation changes that already occurred are not reverted. Despite these costs, EIP-7702 represents a pragmatic and incremental step toward true account abstraction. It gives EOAs smart-account capabilities without migrations, new infrastructure, or breaking existing wallet compatibility. ## Arbitrum and EIP-7702 Arbitrum's ArbOS 40 brings EIP-7702 into the Arbitrum environment. That means EOAs on Arbitrum can now opt in to delegate execution logic in the same way as on the Ethereum mainnet, which activated EIP-7702 as part of the Pectra upgrade. This unlocks new flexibility for builders on Arbitrum. It is now possible to batch transactions in a single atomic call, such as ERC20 approve and a transfer, or multiple calls into a single 7702 transaction. Furthermore, because EOAs can adopt custom logic through persistent delegation, you can create sponsorship flows where a dApp covers gas without requiring the user to hold native tokens. It is specifically on Arbitrum where you can truly experiment with the possibilities of EIP-7702\. In the low gas environment of Arbitrum One with composability across contracts, the possibilities are almost endless for what you can build. Thinking about some possibilities? The [seamless interoperability between the EVM and the Stylus VM](https://blog.arbitrum.foundation/how-to-make-a-solidity-contract-100x-cheaper-and-faster/) in Arbitrum unlocks opportunities using EIP-7702 that are only possible on Arbitrum. For example, you could have an EOA delegate to a smart contract wallet that batches multiple onchain actions atomically. If you only want this behavior for a limited period, submit a follow-up 7702 authorization to clear or update the delegation. EIP-7702 marks a meaningful evolution in account abstraction. By allowing EOAs to delegate their behavior to smart-contract logic that persists until cleared, it reduces friction without requiring protocol-level migrations or infrastructure changes. With Arbitrum adopting it through ArbOS 40, developers now have a fast, low-cost environment to experiment with smart wallet logic, sponsored transactions, and composable execution flows, all natively supported onchain. If you’ve been waiting for a practical bridge between EOAs and smart accounts, this is the moment to explore what’s possible. ## How to Start Using EIP-7702 You can already start experimenting with EIP-7702 on Arbitrum using existing tooling and SDKs. Most modern Ethereum libraries have added early support for the Type 0x04 transaction, making it easy to build and test delegated logic today. - Viem includes helper functions like [signAuthorization()](https://viem.sh/docs/eip7702/signAuthorization?ref=blog.arbitrum.foundation) and [sendTransaction()](https://viem.sh/docs/actions/wallet/signTransaction?ref=blog.arbitrum.foundation) with built-in `authorizationList` support. - Foundry [supports constructing and simulating EIP-7702 transactions](https://getfoundry.sh/reference/cheatcodes/sign-delegation?ref=blog.arbitrum.foundation) for local testing. - QuickNode offers an [i](https://www.quicknode.com/guides/ethereum-development/smart-contracts/eip-7702-smart-accounts?ref=blog.arbitrum.foundation)[mplementation guide](https://www.quicknode.com/guides/ethereum-development/smart-contracts/eip-7702-smart-accounts?ref=blog.arbitrum.foundation) and RPC endpoints for EIP-7702 compatibility. For example, you can accomplish the full EIP-7702 flow using Viem in just a few lines of code: ```javascript import { createWalletClient, http } from "viem"; import { arbitrum } from "viem/chains"; import { privateKeyToAccount } from "viem/accounts"; const eoa = privateKeyToAccount("0xYOUR_KEY"); const client = createWalletClient({ account: eoa, chain: arbitrum, transport: http(), }); const authorization = await client.signAuthorization({ account: eoa, contractAddress, executor: "self", }); await client.sendTransaction({ authorizationList: [authorization], to: eoa.address }); ``` That's the complete EIP-7702 cycle of signing, authorizing and executing all on Arbitrum. You can start testing EIP-7702 transactions on Arbitrum One today. Its low gas costs make it ideal for iterating on delegated-logic wallets, just remember to always validate the contracts you delegate to. ## Learn More If you want to go deeper into building with EIP-7702 and experimenting with account abstraction on Arbitrum, here are a few good places to start: - [EIP-7702 Specification](https://eips.ethereum.org/EIPS/eip-7702?ref=blog.arbitrum.foundation) - [ArbOS 40 Documentation](https://docs.arbitrum.io/run-arbitrum-node/arbos-releases/arbos40?ref=blog.arbitrum.foundation) - [5-minute explainer by Abbas Khan](https://x.com/KhanAbbas201/status/1970412827291632020?ref=blog.arbitrum.foundation) from Ethereum Foundation - [Arbitrum One Explorer View of Recent EIP-7702 Authorizations](https://arbiscan.io/txnAuthList?ref=blog.arbitrum.foundation) - [Arbitrum Stylus Docs](https://docs.arbitrum.io/stylus/stylus-overview?ref=blog.arbitrum.foundation) ### Builder’s Block #003: Faster Arbitrum Nodes, ReyaChain, Scaffold-ETH & More URL: https://blog.arbitrum.foundation/builders-block-003-faster-arbitrum-nodes-reyachain-scaffold-eth-more/ Last updated: 2025-10-10T10:21:51.000Z â„č **tl;dr: DRIP epoch 3, Open House India concludes, new Arbitrum chains launch* ## 📣 Announcements *Key updates from the Arbitrum ecosystem and Foundation.* **‱ Introducing Erigon Nitro for Arbitrum Sepolia** [![G1dOlAvWsAAM8sZ.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G1dOlAvWsAAM8sZ.jpg)](https://erigon.tech/introducing-erigon-nitro-for-arbitrum-sepolia/?ref=blog.arbitrum.foundation) In a major step to enhance client diversity and efficiency, the new v0.1 alpha release shrinks Arbitrum Sepolia archive nodes by 94%, making them incredibly small and fast to sync. âžĄïž [Read the blog post](https://erigon.tech/introducing-erigon-nitro-for-arbitrum-sepolia/?ref=blog.arbitrum.foundation) **‱ Epoch 3 of DRIP has arrived!** Deposit ETH/stables. Borrow & loop. Repeat. [![Blog-Cover-Photo.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/Blog-Cover-Photo.jpg)](https://arbitrumdrip.com/?ref=blog.arbitrum.foundation) A huge DeFi program that rewards real DeFi actions on Arbitrum, starting with Season 1: Leverage Looping Strategy âžĄïž [Read the blog post](https://blog.arbitrum.io/introducing-drip-the-defi-renaissance-incentive-program-on-arbitrum/?ref=blog.arbitrum.foundation) **‱ Our first-ever IRL builder experience just wrapped up with Open House Hack India!** [![0925_Openhouse_India_Recap_option2.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/0925_Openhouse_India_Recap_option2.jpg)](https://blog.arbitrum.foundation/arbitrum-open-house-india-concludes-with-bengaluru-hacker-house-full-recap/) 100+ teams came to Bengaluru to bring their ideas onchain and compete for $70K in prizes. The result? Arbitrum Everywhere. âžĄïž [Discover the winners](https://blog.arbitrum.foundation/arbitrum-open-house-india-concludes-with-bengaluru-hacker-house-full-recap/) **‱ The Arbitrum bridge's UX got a big upgrade** [![arbitrum-bridge-blog-image.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/arbitrum-bridge-blog-image.png)](https://blog.arbitrum.io/arbitrum-bridge-embed/?ref=blog.arbitrum.foundation) Builders can now embed the Arbitrum bridge directly into their apps giving users a seamless onramp without ever leaving. Integrate with ease. Customize layout. Add routing options. âžĄïž [Read the blog post](https://blog.arbitrum.io/arbitrum-bridge-embed/?ref=blog.arbitrum.foundation) --- ## 🔩 Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* **‱ Reya partnered with Gelato to launch a custom high-performance Arbitrum chain for perpetual trading at scale.** [![G1s4BkzaAAAShBz.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G1s4BkzaAAAShBz-1.jpg)](https://gelato.cloud/blog/building-reyachain?ref=blog.arbitrum.foundation) Together with Gelato, Reya achieved sub-100ms block times, 400+ Mgas/s throughput, Enshrined perp-specific logic and Gasless UX for their Arbitrum chain. âžĄïž [Read about Reya's story](https://gelato.cloud/blog/building-reyachain?ref=blog.arbitrum.foundation) **‱ AI on Arbitrum is accelerating: Finding the Intersection of Blockchain and AI** Read into how AI is making DeFi seamless and why teams like Capx AI, USD.AI, ZyFAI and more call Arbitrum their home. âžĄïž [Read the blog post](https://blog.arbitrum.io/finding-the-intersection-of-blockchain-and-ai/?ref=blog.arbitrum.foundation) **‱ How Fairblock is Unlocking Confidential Payments and Auctions on Arbitrum** [![G1Nop-lWUAAvm-0.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/G1Nop-lWUAAvm-0.jpg)](https://x.com/0xfairblock/status/1969033915210830007?ref=blog.arbitrum.foundation) âžĄïž [Read the case study on Fairblock](https://blog.arbitrum.io/how-fairblock-is-unlocking-confidential-payments-and-auctions-on-arbitrum/?ref=blog.arbitrum.foundation) **‱ How Lit Protocol Coordinates Decentralized Key Management with Stylus** [![0925_Arbitrum_LitProtocol_Blog_option3.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/10/0925_Arbitrum_LitProtocol_Blog_option3.jpg)](https://blog.arbitrum.io/how-lit-protocol-coordinates-decentralized-key-management-with-stylus/?ref=blog.arbitrum.foundation) âžĄïž [Read the case study on Lit Protocol](https://blog.arbitrum.io/how-lit-protocol-coordinates-decentralized-key-management-with-stylus/?ref=blog.arbitrum.foundation) --- ## đŸ› ïž Dev Tooling & Infra **Updates to SDKs, CLIs, and developer workflows across the stack.** **‱ BuidlGuidl and Arbitrum just dropped the Arbitrum Extension for Scaffold-ETH!** Deploy, build, and iterate faster than ever on Arbitrum with Scaffold-ETH. Run the command below and choose hardhat or foundry. npx create-eth@1.0.4 -e BuidlGuidl/arbitrum-extension âžĄïž [Peep the github repo](https://github.com/BuidlGuidl/arbitrum-extension?ref=blog.arbitrum.foundation) **‱ zk-proofs written in Noir, verified on-chain with Arbitrum Stylus** You can now run advanced cryptography natively inside Stylus contracts, powering private, verifiable & censorship-resistant apps. âžĄïž [Read the project docs](https://nsv.wakeuplabs.link/?ref=blog.arbitrum.foundation) **‱ Quick 5-min breakdown of EIP-7702 - from EOAs vs Smart Accounts to why this matters for UX, plus a live demo on Arbitrum** If you’ve been curious about EIP-7702, here’s the shortcut you don't want to miss. A video by Ethereum Foundation Founder Success' Abbas Khan. âžĄïž [Watch the video](https://x.com/KhanAbbas201/status/1970412827291632020?ref=blog.arbitrum.foundation) --- ## đŸ§” Forum & Community Discussions *What builders are debating and proposing this week.* **‱ Check out the new research on privacy in DAO voting by** **@stonecoldpat0, @tallyxyz, @theamyzhao and folks at @initc3org** They show how weighted voting can leak voter choices, introduce a new framework called B-Privacy, and propose ways to make bribery much harder. âžĄïž [Read the full thread](https://x.com/initc3org/status/1970511900451708930?ref=blog.arbitrum.foundation) **‱ Arbitrum Foundation has published a new quorum model on the DAO forum.** The proposed approach moves away from the current approach, where quorum is a percentage of the voteable supply, to quorum as a percentage of delegated voting power (DVP). âžĄïž [Read the discussion](https://forum.arbitrum.foundation/t/dvp-quorum-for-arbitrumdao/29996?ref=blog.arbitrum.foundation) **‱ AIP: Remove Cost Cap, Update Executors, Disable Legacy USDT Bridge successfully executed** This AIP combines and puts forward three separate proposals for the ArbitrumDAO to consider: Remove Cost Cap on Arbitrum Nova, Update the Upgrade Executors, and Disable Legacy Tether Bridge. âžĄïž [Check out the vote on Tally](https://www.tally.xyz/gov/arbitrum/proposal/51852039695020109312343918128899814224888993575448130385109956762385891284115?govId=eip155:42161:0xf07DeD9dC292157749B6Fd268E37DF6EA38395B9&ref=blog.arbitrum.foundation) --- That’s all from Builder’s Block #003\. Thank you for reading, and keep building. Arbitrum Everywhere. ### How to Make a Solidity Contract 100x Cheaper and Faster URL: https://blog.arbitrum.foundation/how-to-make-a-solidity-contract-100x-cheaper-and-faster/ Last updated: 2025-10-02T14:37:50.000Z If you've built on Ethereum, you know the drill: everything lives in Solidity. That means when you want to do something more compute-heavy, like run advanced math or cryptography, you end up paying high gas costs. Each step, whether arithmetic, memory access, or a state read or write, is metered in the EVM. That makes small operations inexpensive, but raw compute, such as loops, cryptographic functions, or large memory usage, incurs high costs. You can’t just pull in your favorite Rust library or drop in some optimized C++. But what if you could? What if heavy computation could be metered in a much smaller unit, making it more efficient? What if you could reach for other languages without losing the interoperability you already rely on? Developers are often forced into trade-offs. We can stay in Solidity and accept these costs, or move off into specialized domain-specific languages (DSLs) that break composability. Neither feels great. It doesn't have to be that way. ## The Stylus MultiVM Stylus changes this by introducing the MultiVM on Arbitrum. You get the EVM and a WebAssembly (Wasm) virtual machine running side by side, both sharing the same state tree. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/09/stylus-multivm.jpg) That means there are no silos: A Rust contract compiled to Wasm looks just like other code on the chain. Solidity can call it directly. The interoperability is built in at the protocol level. Since Wasm executes much more efficiently, Stylus measures its operations in *ink*, a unit smaller than gas that makes it possible to price compute and memory more precisely. Under the hood, the system decides which VM to use based on a contract's header. If it's EVM bytecode, it runs on the EVM. If it's Wasm, it runs in Wasmer, the execution engine used by Stylus. Both paths feed into the same ABI layer and update the same state tree, so from a developer perspective, a cross-VM call looks just like any other contract call. ![Visualization of Execution Paths based on a Header Check](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/09/unnamed-1.png) The result is that Solidity contracts and Stylus contracts run in parallel, allowing them to call each other seamlessly. ## Calling Stylus from Solidity Let's take a look at how this works. Suppose you've deployed an NFT contract written for the Stylus VM using the Stylus Rust SDK. You want to mint tokens from a Solidity contract. Here's how you'd do it: ```javascript pragma solidity ^0.8.0; interface IStylusNFT { function mint(address to, uint256 tokenId) external; } contract NFTCaller { IStylusNFT public stylusNFT; constructor(address stylusNFTAddress) { stylusNFT = IStylusNFT(stylusNFTAddress); } function mintFromSolidity(address to, uint256 tokenId) external { stylusNFT.mint(to, tokenId); } } ``` That's it. To Solidity, the Stylus NFT contract is simply another address that implements the `mint` function. There's no bridging or glue code. The EVM and Wasm VMs both live under Arbitrum Nitro, and they share the same account model. This interoperability opens the door to new designs. You can keep your Solidity contracts as the familiar interface for the basic functionality of your application, while moving gas-intensive logic into Rust for huge efficiency gains. You don't lose composability, and you don't abandon the EVM ecosystem. With Stylus, you don't need to debate the classic trade-off we began with. Both Solidity and the higher-performance language of your choice can work in tandem to produce the best results for your needs. No painful compromises needed. ## Learn More If you want to go deeper into building interoperable applications with Solidity and Stylus, here are a few good places to start: - [Gentle Introduction to Stylus](https://docs.arbitrum.io/stylus/gentle-introduction?ref=blog.arbitrum.foundation) - [Rust SDK Guide](https://docs.arbitrum.io/stylus/reference/overview?ref=blog.arbitrum.foundation) - [Stylus Examples](https://github.com/OffchainLabs/stylus-by-example?ref=blog.arbitrum.foundation) - [Gas Metering in Stylus](https://docs.arbitrum.io/stylus/concepts/gas-metering?ref=blog.arbitrum.foundation) - [OpenZeppelin Stylus Wizard](https://wizard.openzeppelin.com/stylus?ref=blog.arbitrum.foundation) - [Scaffold-Stylus](https://www.scaffoldstylus.com/?ref=blog.arbitrum.foundation) - [Interactions Between Solidity and Stylus](https://www.youtube.com/live/8xEkv5bRIjs?t=7140s&ref=blog.arbitrum.foundation) ### Arbitrum Open House India Concludes With Bengaluru Hacker House: Full Recap URL: https://blog.arbitrum.foundation/arbitrum-open-house-india-concludes-with-bengaluru-hacker-house-full-recap/ Last updated: 2025-09-25T13:29:02.000Z The Arbitrum Open House [initiative](https://blog.arbitrum.io/introducing-arbitrum-open-house-learn-build-hack/?ref=blog.arbitrum.foundation) launched with a bold mission: to spark a new wave of builders by offering hands-on, localized support and immersive experiences for talent from around the globe. As the first edition of Open House culminates in the high-energy Bengaluru Hacker House, we can proudly reflect on the tremendous strides made toward achieving that vision. 0:00 /0:37 1× ## Bengaluru Hacker House When the Arbitrum Foundation planned its next big push to onboard builders, the obvious stage to launch its inaugural hacker house was India, the fastest-growing hub for Web3 talent. Over four action-packed days, participants dived into technical and founder-focused workshops, tapped into mentorship sessions, pitched ideas, and pushed their limits in a grueling 55-hour hacker house that left no code untouched. Set against Bengaluru’s calm, energizing monsoon backdrop, the Hacker House attracted top talent from across the country. From roughly 500 applications, over **100 teams and individuals were handpicked to compete for a $70K prize pool**. The aim was to reward and nurture young founders who could go on to build world-class applications on Arbitrum, the very same tech that industry leaders like BlackRock and Robinhood rely on. On the last day, **23 projects submitted their demos for the top three spots.** Each project was evaluated by a panel of judges, both from within the Foundation and external, across key criteria, including team quality, alignment with Arbitrum, technical execution, product-market fit, and innovation. ### Winners of Bengaluru Hacker House 2025 The Bengaluru Hacker House showcased an impressive range of projects spanning DeFi, privacy, gaming, onchain insurance, developer tooling, and innovative consumer applications that address region-specific challenges. On the ground, teams put Stylus and Orbit to full use, demonstrating both creativity and technical mastery. **First Place ($40,000):** [**Orbital AMM Protocol**](https://arbitrum.hackquest.io/projects/Arbitrum-Open-House-India-IRL-Hack-Bengaluru-Orbital-AMM-Protocol?ref=blog.arbitrum.foundation) Stablecoins are taking over the financial landscape, and Orbital AMM Protocol is ready to ride the wave. The team of four from IIT Roorkee introduced a novel AMM that supports thousands of stablecoins within a single pool by extending concentrated liquidity into higher dimensions. Inspired by Paradigm’s Orbital model, Orbital combines the best of Uniswap and Curve protocols. The team implemented a high-precision math layer in Stylus to compute multi-asset invariants at lightning speed, then added trade segmentation to handle large orders without slippage spikes. **Second Place ($20,000):** [**Shinobi.Cash**](https://arbitrum.hackquest.io/projects/Arbitrum-Open-House-India-IRL-Hack-Bengaluru-ShinobiCash?ref=blog.arbitrum.foundation) Onchain privacy is scaling rapidly. Shinobi.Cash is ready to lead the charge with its innovative cross-privacy pools that enable users to deposit on any EVM chain and withdraw privately on any other chain, all through a single Arbitrum deployment. By integrating account-abstraction paymasters on Arbitrum, the team reduced withdrawal costs and prototyped “deposit-anywhere, withdraw-anywhere” flows using a ZK circuit powered by the Open Intent Framework. **Third Place ($10,000):** [**GuardChain.ai**](http://guardchain.ai/?ref=blog.arbitrum.foundation) GuardChain.ai tackles the region-specific challenge of insurance claims in India with Arbitrum. Their blockchain-native, community-led model combines AI-assisted claims with onchain transparency to help gig workers and self-help groups access insurance efficiently. The team scoped an Orbit-backed path for a dedicated insurance chain, enabling predictable costs for claims processing, jury votes, and surplus distribution as usage scales. We congratulate all the winners and thank our sponsors, including Appwrite, Ethereum Foundation: Founder Success, Couchbase, and OpenZeppelin, for supporting ecosystem builders through Open House. ## Arbitrum Open House Wrap Up The Open House India program was structured as a three-stage journey—Learn, Build, and Hack—that meets builders where they are. Alongside the Hacker House, which concluded in Bengaluru, the **Learn** and **Build** tracks, which were open to a global pool of developers, also saw enthusiastic participation and strong results. ### **Open House Learn 2025** The Learn initiative introduced the Arbitrum stack through practical workshops, self-paced interactive courses, and Q&As, reducing time-to-first-commit for both new and experienced teams. The learn courses saw **participation from more than 550 individuals**, covering everything from dev tooling basics to writing high-performance smart contracts with Stylus. ### **Open House Build 2025** Following the Learn program, builders came together for a **three-week online buildathon** designed to help teams form, experiment, and iterate toward working prototypes. With mentor-led feedback, informal pitch sessions, and plenty of collaboration, the buildathon attracted 72 high-quality submissions competing for $33K in prizes. The winners were: **First Place ($15,000):** [**Plexi**](https://www.hackquest.io/projects/Arbitrum-Open-House-India-Online-Buildathon-plexi?ref=blog.arbitrum.foundation) A next-gen composable ERC-4626 vault built on Arbitrum, Plexi simplifies on-chain yield farming with a transparent and capital-efficient approach. **Second Place ($5,000):** [**Orbital**](https://www.hackquest.io/projects/Arbitrum-Open-House-India-Online-Buildathon-Orbital?ref=blog.arbitrum.foundation) The eventual Hacker House champion first cut its teeth here. Orbital is a breakthrough AMM capable of supporting anywhere from 2, 3, or even 10,000 stablecoins in a single pool, scaling concentrated liquidity into higher dimensions. Their [rapid progress](https://arbitrum.hackquest.io/projects/Arbitrum-Open-House-India-IRL-Hack-Bengaluru-Orbital-AMM-Protocol?ref=blog.arbitrum.foundation) from the online buildathon to the Hacker House win showcases their ambition and technical edge. **Third Place ($2,500):** [**TriggerX**](https://www.hackquest.io/projects/Arbitrum-Open-House-India-Online-Buildathon-TriggerX?ref=blog.arbitrum.foundation) TriggerX is a decentralized automation protocol that enables smart contracts to execute tasks based on time, conditions, or external events in a fully automated and trustless manner. ## What’s next for Builders? With Open House India wrapped up, the journey is just beginning. The Open House model will now expand globally, with **North America** **up next**. Builders can also look forward to the upcoming **Demo Day**, where standout teams will showcase their projects to investors, mentors, and the broader community. Beyond that, the ecosystem is wide open from [**grant programs**](https://arbitrum.foundation/grants?ref=blog.arbitrum.foundation) to [**accelerators**](https://medium.com/offchainlabs/onchain-labs-accelerating-the-app-layer-of-arbitrum-1ac2b64eeae3?ref=blog.arbitrum.foundation) for anyone ready to build the next wave of world-class applications on Arbitrum. Stay plugged in by signing up for the [**Arbitrum Builder’s Block**](https://blog.arbitrum.foundation/tag/builder-newsletter/?ref=blog.arbitrum.io)Newsletter and be the first to hear about upcoming announcements. ### The Arbitrum Builder's Block: #002 URL: https://blog.arbitrum.foundation/the-arbitrum-builders-block-002/ Last updated: 2025-09-03T13:04:27.000Z *Whether you're building on the Arbitrum platform with Rust or Solidity, we've got you covered.* â„č **tl;dr* **O*ffchain Labs acquires Zerodev; partners with Succinct, Open House Hack announced, Typescript support for Stylus, lots of dev tooling updates and releases. Scroll on for tools, events, and threads. ## Announcements *Key updates from the Arbitrum ecosystem and the Foundation.* - **Offchain Labs is bringing ZK to the Arbitrum ecosystem with SuccinctLabs** Tandem has partnered with Succinct, enabling faster capital movement and simpler integration for developers through the power of modular ZK provers. âžĄïž [Read the full thread](https://x.com/OffchainLabs/status/1960330285364498925?ref=blog.arbitrum.foundation) âžĄïž [Explore Tandem](https://www.offchainlabs.com/tandem?ref=blog.arbitrum.foundation) - **Register for the Open House India IRL Hacker House in Bengaluru and ship your ideas onchain** ![Gzb0NwjbIAA5Ywl.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/09/Gzb0NwjbIAA5Ywl.jpg) The IRL Hacker House in Bengaluru brings four days of intensive hacking using the same tech stack that BlackRock and Robinhood bet their reputations on. We've built the infrastructure - you bring the vision. - 4 days of hacking - 1:1 mentoring & workshops with our sponsors: - OpenZeppelin - Ethereum Foundation - Founder success program - Appwrite - Couchbase - wellness activities - **$70k in prizes** âžĄïž [Register now](https://lu.ma/openhousehack-india?ref=blog.arbitrum.foundation) - **Offchain Labs has acquired Zerodev, one of the most talented teams in crypto building next-gen smart accounts** ![GyPTGIeXgAA21GM.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/09/GyPTGIeXgAA21GM.jpg) ZeroDev powers more than 5 million smart accounts across 30+ chains today. This acquisition comes at a time when more large institutions are committing to bringing their businesses onchain and where consumer apps are becoming an effective onboarding mechanism for everyday users. There's an enormous need for backend infrastructure that can be flexible, secure, and seamless without compromise. We believe smart accounts are central to delivering on these promises. âžĄïž [Read the full thread](https://x.com/OffchainLabs/status/1955645881505456342?ref=blog.arbitrum.foundation) --- ## Ecosystem Highlights *Fresh launches and standout threads from around the Arbitrum ecosystem.* - **How Variational is Reinventing Derivatives Onchain with Arbitrum** ![0825_Variational_CaseStudy_Blog_option1.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/09/0825_Variational_CaseStudy_Blog_option1.jpg) Read into how Variational is accelerating derivatives on Arbitrum in this case study. âžĄïž [Read the blog post](https://blog.arbitrum.io/how-variational-is-reinventing-derivatives-onchain-with-arbitrum/?ref=blog.arbitrum.foundation) - **EntropyAdvisors launched a new Dune dashboard: Arbitrum Network Overview** Did you know that Arbitrum: - Has \~$20B TVS - Generated $300M+ annualised Gross Protocol Fees - Reached 2k+ Max TPS âžĄïž [Read on for a breakdown of the data](https://x.com/EntropyAdvisors/status/1960356621449855268?ref=blog.arbitrum.foundation) âžĄïž [Check out the dashboard](https://dune.com/entropy%5Fadvisors/arbitrum-one-network-overview?ref=blog.arbitrum.foundation) - **Gamer Spotlight covers Footium, an onchain football management game** Dive into Footium, a strategic onchain football management game that lets you own your club, set your tactics, and compete against other players in a live match setting, built on Arbitrum. âžĄïž [Read the spotlight](https://x.com/ArbitrumPlay/status/1961037467047632993?ref=blog.arbitrum.foundation) --- ## Dev Tooling & Infra *Updates to SDKs, CLIs, and developer workflows across the stack.* - **ArbOS 40 (Callisto) is now live across all Arbitrum Orbit chains via Gelato** ![GzdKbBebkAIk5-6.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/09/GzdKbBebkAIk5-6.jpg) Launch Orbit chains with enterprise-grade UX from day one. Orbit chains deployed with Gelato can access powerful UX and EIP-7702 features out of the box: - Batching - combine multiple user operations into a single tx - Gasless UX - sponsor gas or let users pay with any token - Security - enable passkey login, session keys, and spending limits - Seamless onboarding - add MFA, recovery, and permissioned workflows âžĄïž [Read the full post](https://x.com/gelatonetwork/status/1961117996199649471?ref=blog.arbitrum.foundation) - **AssemblyScript support for Stylus arrives, powered by WakeUp Labs** Developers can now: - Write contracts in TypeScript-like syntax - Deploy ERC-20s - Play with NFTs (ERC-721) - Try the CLI + web playground âžĄïž [Read the thread for details](https://forum.arbitrum.foundation/t/wakeup-labs-update-thread-assemblyscript-integration-for-the-arbitrum-stylus-sdk/29038/6?u=wakeuplabs&ref=blog.arbitrum.foundation) âžĄïž [Check it out on GitHub](https://github.com/wakeuplabs-io/assembly-script-stylus-sdk?ref=blog.arbitrum.foundation) - **thewizard.app allows you to write, test, and deploy Rust contracts directly in your browser. No setup required** [![rEHYX5E.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/09/rEHYX5E.png)](https://thewizard.app/?ref=blog.arbitrum.foundation) Wizard is a complete development environment for Stylus smart contracts, right in your browser. Featuring: - Instant Project Setup - Rust Code, Stylus-Ready - Zero-Setup Compilation - 1-Click Arbitrum Deployment - Interactive Contract Testing - Share & Collaborate with read-only links âžĄïž [Give Wizard a try](https://thewizard.app/?ref=blog.arbitrum.foundation) - **The 1 year anniversary of Stylus/Rust contracts on Arbitrum is coming up on September 3rd** This means some contracts will need to go through annual re-activation. âžĄïž [Here's what this means and what to do](https://x.com/ArbitrumDevs/status/1958249375114661996?ref=blog.arbitrum.foundation) --- ## Events *Workshops, hackathons, and ecosystem meetups to watch.* - **Open House India Hack: Sep 18-21** The IRL Hacker House in Bengaluru brings four days of intensive hacking using the same tech stack that BlackRock and Robinhood bet their reputations on. We've built the infrastructure - you bring the vision. âžĄïž [Register now for Open House India Hack](https://lu.ma/openhousehack-india?ref=blog.arbitrum.foundation) --- ## Forum & Community Discussions *What builders are debating and proposing this week.* - **Discussion: Improving the Arbitrum Security Council** This discussion covers how to enhance the candidate pool for future elections, improve the Security Council’s operations, strengthen other off-chain aspects of the Security Council election process, and address topics identified in OpenZeppelin’s Arbitrum Security Council Recommendations. âžĄïž [Read the full post and participate in the discussion](https://forum.arbitrum.foundation/t/discussion-improving-the-arbitrum-security-council/29907?ref=blog.arbitrum.foundation) - **Lampros DAO has created an Arbitrum Orbit chains revenue dashboard** This dashboard helps shine light on which Orbit chains are generating the most revenues and to see the broader economic patterns for Orbit chains. For now, it contains the following Orbit chains: Deri, Rari, Xai, Proof of Play Apex, Blessnet, EDU Chain, ApeChain, Molten Network, Proof of Play Boss, WINR, Superposition, Sanko. More chains will be added as they become indexable. âžĄïž [Check out the dashboard](https://dune.com/lamprosdao/arbitrum-ecosystem-revenue-from-orbit-chains?ref=blog.arbitrum.foundation) âžĄïž [Read the full post](https://forum.arbitrum.foundation/t/arbitrum-orbit-chains-revenue-dashboard-by-lampros-dao/29894?ref=blog.arbitrum.foundation) - **The Open Discussion of Governance Call took place last week**\> Topics covered include the Omnibus proposal, version 1.7 for Delegate Incentive Program, Security Council election improvement process, ArbOS 50, and sunsetting the DIP program. âžĄïž [Read the full post](https://forum.arbitrum.foundation/t/arbitrum-orbit-chains-revenue-dashboard-by-lampros-dao/29894?ref=blog.arbitrum.foundation) âžĄïž [Watch the recording](https://drive.google.com/file/d/1iKqxeAZ8ILSG6PF4eh9m-sitFWFWWpha/view?ref=blog.arbitrum.foundation) - **Arbitrum Gaming Ventures (AGV) posted their Aug update** In Sep, the AGV will be attending Korea Blockchain Week and TOKEN2049 Singapore to connect with builders and highlight Arbitrum’s growing footprint in Asia. The AGV team is now also fully operational with 2 additional hires: the General Manager that brings deep experience in gaming, venture capital, and corporate development and the General Counsel whose role is to guide legal operations and deal flow while shaping AGV regulatory strategy. âžĄïž [Read the AGV August update](https://forum.arbitrum.foundation/t/agv-monthly-update-august-2025/29895?ref=blog.arbitrum.foundation) - **The Speedrun Stylus grant has concluded and the grantee posted their final report on the forum** The program is an open developer onboarding and challenge platform focused on Stylus and ZK within the Arbitrum ecosystem. Since the initial go-live in Jun 2025, the program has onboarded 400+ developers, 650 project submissions, and 5 live sessions and workshops. âžĄïž [Read the report](https://forum.arbitrum.foundation/t/speedrun-stylus-final-grant-completion-report/29893?ref=blog.arbitrum.foundation) - **On Tally, the Omnibus proposal entered its final week of voting** The proposal combines 3 routine technical proposals: Remove Cost Cap on Nova, Update the Upgrade Executors, and Disable Legacy Tether Bridge. As of the date of writing, the proposal has garnered 103.5M votes out of 206.5M votes needed. There’re about 4 days left for voting until Sep 5th. âžĄïž [Read the proposal and vote](https://www.tally.xyz/gov/arbitrum/proposal/51852039695020109312343918128899814224888993575448130385109956762385891284115?govId=eip155:42161:0xf07DeD9dC292157749B6Fd268E37DF6EA38395B9&ref=blog.arbitrum.foundation) - **On Snapshot, ArbOS 50 Dia is undergoing a temperature check** So far the sentiment has been overwhelmingly positive, with 42.5M votes in favor of the proposal. The off-chain vote will be available until Sep 4th. âžĄïž [Read the proposal and vote](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth/proposal/0x33754da4006d0ef38666ec5d5e85fd0966a891a594ab9dc21f23beedea2d330b) --- That’s all from Builder’s Block #2\. Thank you for reading, and keep building. Arbitrum Everywhere. ### The Arbitrum Builder's Block: #001 URL: https://blog.arbitrum.foundation/the-arbitrum-builders-block-001/ Last updated: 2025-08-12T17:15:37.000Z ### Builder's Block is a biweekly educational newsletter from the Arbitrum Foundation focused on delivering you the latest developer news surrounding the Arbitrum tech stack and ecosystem. **Whether you're building on the Arbitrum platform with Rust or Solidity, we've got you covered.** â„č **tl;dr* **Open House* announced, Arbitrum Audit program launched, StylusPort announced, lots of dev tooling updates and releases. Scroll on for tools, events, and threads. ## Announcements **Key updates from the Arbitrum ecosystem and the Foundation.** **Arbitrum Open House: Kicking off with India** ![GxNEjhkbkAAVl8S.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/08/GxNEjhkbkAAVl8S.jpg) Openhouse is a hands-on builder experience featuring virtual workshops, regional buildathons, IRL hacker houses, and an invite-only accelerator for top teams. We are starting the Open House journey from India. At Bengaluru, you can meet our team for an IRL Hacker House in September. âžĄïž [Register now](https://openhouse.arbitrum.io/?ref=blog.arbitrum.foundation) **Open House Learn is now live** ![GxgmyD0bkAA1HAo.jpg](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/08/GxgmyD0bkAA1HAo-1.jpg) Open House Learn is the first phase of the Open House program. It is a beginner-friendly program designed to help you start your journey on Arbitrum. You can register and jump in at any time! ‱ Hands-on workshops ‱ AMAs with our team ‱ Interactive courses âžĄïž [Find the agenda here](https://x.com/ArbitrumDevs/status/1952353084027621417?ref=blog.arbitrum.foundation) âžĄïž [Register now](https://arbitrum.hackquest.io/?ref=blog.arbitrum.foundation) **Open House Build is open for registrations, to start Aug 22nd** ![OH_Social_Graphic_02_Build.png](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/08/OH_Social_Graphic_02_Build.png) Open House Build is the second phase of the Open House program. You will embark on a 3-week online buildathon where you will receive mentorship, workshops and create innovative projects with **$33k in prizes**. ‱ Hands-on workshops ‱ Friendly pitch sessions ‱ Mentor support âžĄïž [Register now](https://arbitrum.hackquest.io/?ref=blog.arbitrum.foundation) **Introducing the $10M Arbitrum Audit Program, one of crypto’s largest audit grants!** Early-stage projects building (or planning to build) on Arbitrum can now apply for third-party audit grants and investments. âžĄïž [Apply today and learn more](https://tally.so/r/3xzEzv?program=aap&ref=blog.arbitrum.foundation) **ArbiFuel is still live: Arbitrum Builders, Claim Your Gas Fee Sponsorship** At Arbitrum, builders come first. That’s why we’ve launched ArbiFuel, a Gas Fee Sponsorship Program to help early-stage teams ship faster, test freely, and onboard users without worrying about gas costs. âžĄïž [Apply now](https://blog.arbitrum.foundation/arbifuel-is-live-arbitrum-builders-claim-your-gas-fee-sponsorship/) ## Learn & Build **New learning drops and hands-on resources from across the Arbitrum ecosystem.** ## ![Stylus logo](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/stylus_logo.png)Stylus **Curious what Move looks like on Arbitrum?** In this article, @baygeeth breaks down how @rather\_labs is bringing the Move programming language to Stylus, and the new possibilities it unlocks for developers building on Arbitrum. âžĄïž [Read the article](https://stylus-saturdays.com/p/stylus-contract-deployments-list?ref=blog.arbitrum.foundation) **AssemblyScript + Stylus: In Action!** WakeUp Labs have been working on integrating AssemblyScript with the Arbitrum Stylus SDK. TypeScript and script-like language devs will be able to write smart contracts for Arbitrum more easily. âžĄïž [Watch the video](https://www.youtube.com/watch?v=yKmTTFE6gxc&ref=blog.arbitrum.foundation) ### Templates & Starter Kits **Here's a 3-min breakdown of a full-stack starter kit for building Farcaster Mini Apps with Arbitrum Stylus** React frontend, wallet connect, and Rust smart contracts — all set up and ready to ship. âžĄïž [Grab the template](https://github.com/hummusonrails/farcaster-arbitrum-miniapp-starter?ref=blog.arbitrum.foundation) âžĄïž [Watch the 3 minute tutorial](https://www.youtube.com/watch?v=LSseY2avwfY&ref=blog.arbitrum.foundation) âžĄïž [Read the blog for a step by step tutorial](https://blog.arbitrum.foundation/build-a-farcaster-mini-app-with-arbitrum-in-minutes/) --- ## Ecosystem Highlights **Fresh launches and standout threads from around the Arbitrum ecosystem.** **GetBlock just deployed regional ARB RPC support in New York & Singapore** To help you test, scale, and launch faster, they're opening up 50M CU/month on their Shared plan — at no cost. âžĄïž [Here's how to get access](https://x.com/getblockio/status/1950567541522235674?ref=blog.arbitrum.foundation) **The most comprehensive GMX Perpetuals Trading course, taught by @ProgrammerSmart, is now live on @CyfrinUpdraft** Build GMX-based protocols from the ground up: đŸ”č Mechanics, fees, funding math đŸ”č Order types, liquidations, ADL đŸ”č GLP, staking, delegation âžĄïž [Read the thread + article](https://x.com/GMX%5FIO/status/1938557174986281157?ref=blog.arbitrum.foundation) **Trailblazer 2.0 is still ongoing** Don’t sleep on free funding! If you’re tinkering with EmberAGI's Vibekit, we’re offering $1 million in grants to support builders who launch agents, agent templates, or any of the contributions below with VibeKit, demonstrating clear utility and performance, with a cap of $10k per submission. âžĄïž [Apply here](https://docs.google.com/forms/d/e/1FAIpQLSe-GF7UcUOuyEMsgnVpLFrG%5FW83RAchaPPqOCD83pZaZXskgw/viewform?ref=blog.arbitrum.foundation) --- ## Dev Tooling & Infra **Updates to SDKs, CLIs, and developer workflows across the stack.** **StylusPort is now live: a full migration framework for moving Solana programs to Stylus** Learn how to write EVM interoperable smart contracts on Arbitrum using Stylus, without leaving your Rust comfort zone. A collaboration between Oak Security, Range, and Arbitrum. âžĄïž [Read the full post](https://oaksecurity.substack.com/p/from-solana-to-stylus?r=58vjs6&utm%5Fcampaign=post&utm%5Fmedium=web&triedRedirect=true) âžĄïž [Interested in porting a program from Solana to Stylus? Take the developer survey.](https://form.typeform.com/to/zhChasFV?typeform-source=oaksecurity.substack.com&ref=blog.arbitrum.foundation) **OpenZeppelin Contracts for Stylus v0.3.0-alpha.1 is live** Upgradeable proxies, ZK-optimized curves, and thoughtful access control improvements — big step forward for secure, Rust-native EVM apps. âžĄïž [Read the thread for details](https://x.com/OpenZeppelin/status/1950916015941918818?ref=blog.arbitrum.foundation) âžĄïž [Check it out on GitHub](https://github.com/OpenZeppelin/rust-contracts-stylus/releases/tag/v0.3.0-alpha.1?ref=blog.arbitrum.foundation) **Introducing the OpenZeppelin Contracts MCP** Build secure, OpenZeppelin-standard smart contracts directly in Cursor, Anthropic, Windsurf, or any AI assistant. Now available on Arbitrum Stylus. âžĄïž [Try it out now](https://mcp.openzeppelin.com/?ref=blog.arbitrum.foundation) **Audited release of the OpenZeppelin Rust Contracts for Stylus v0.2.0 is here** DeFi, NFT infra, royalties, vaults, wrappers, and more. âžĄïž [Check out the new features](https://github.com/OpenZeppelin/rust-contracts-stylus/releases/tag/v0.2.0?ref=blog.arbitrum.foundation) **Request for feedback regarding planned move of getL1Confirmations & findBatchContainingBlock to native arb\_\* RPC methods** We plan to make some changes to frequently used helper functions that many dapps and tools call indirectly through the Arbitrum SDK. âžĄïž [View details of the planned migration & share your feedback](https://arbitrum.notion.site/Request-for-feedback-regarding-planned-move-of-getL1Confirmations-findBatchContainingBlock-to-nati-23a01a3f59f88097ac01d99e3a5b51fc?ref=blog.arbitrum.foundation) **Introducing a full GUI for the Stylus Cache Manager, built by CoBuilders.** Stylus contracts can reserve cache slots for faster and cheaper execution. But managing those slots requires constant bidding and manual monitoring. CoBuilders built a frontend that makes it seamless: đŸ”č One-click & automated bidding đŸ”č Real-time alerts via Slack/Telegram đŸ”č Dashboards with bid + slot visualizations đŸ”č Fully open source âžĄïž [Try it out now](https://stylus.cobuilders.xyz/cache-status?ref=blog.arbitrum.foundation) --- ## Events **Workshops, hackathons, and ecosystem meetups to watch.** **August 13 – Builder night with @farcaster\_xyz** Come chat with fellow devs about everything from Mini Apps to DeFi âžĄïž [Register now](https://lu.ma/4u4l08xg?ref=blog.arbitrum.foundation) **August 14 – Unlocking High-Performance Rust Smart Contracts on Arbitrum Stylus with OpenZeppelin: Open House Learn** Learn how to build secure Rust contracts leveraging the OpenZeppelin Rust SDK and learn about best practices for Stylus. âžĄïž [Register now](https://arbitrum.hackquest.io/?ref=blog.arbitrum.foundation) **Open House India Gather: August 16,17, 23 and 24** Open House Gather is a series of IRL Gatherings in India (Hyderabad, Pune, Mumbai and Delhi), co-organised by the Arbitrum Foundation and Arbitrum Ambassadors to cover the ins and outs of our Ambassador and Open House Builder Program. *What to Expect at Open House Gather:* - Crisp keynotes and Q&A about Arbitrum's goals in India, Ambassador Program and Open House Program. - Opportunities to share what’s working, what’s challenging, and what support you’d like to see from Arbitrum in India - Swag, snacks, and good vibes âžĄïž [Register now for OH Gather Hyderabad](https://lu.ma/openhousehack-hyderabad?ref=blog.arbitrum.foundation) âžĄïž [Register now for OH Gather Delhi ](https://lu.ma/openhousegather-delhi?ref=blog.arbitrum.foundation) âžĄïž [Register now for OH Gather Pune](https://lu.ma/openhousegather-pune?ref=blog.arbitrum.foundation) âžĄïž [Register now for OH Gather Mumbai](https://lu.ma/openhousegather-mumbai?ref=blog.arbitrum.foundation) --- ## Forum & Community Discussions **What builders are debating and proposing this week.** **Arbitrum Gaming Ventures Monthly Report (July 2025)** TL;DR: Hired a grants lead, new playtests, Transparency Report released âžĄïž [Read the full thread](https://forum.arbitrum.foundation/t/agv-monthly-update-july-2025/29731?ref=blog.arbitrum.foundation) **Disclosure of support for EIP-2537 on Arbitrum One and Nova** Offchain Labs (OCL) has recently been made aware that the precompiled contracts for performing various operations over the BLS12-381 elliptic curve, including BLS signature verification, were added but not properly enabled in ArbOS 40 Callisto as originally expected. Read on for what that means and what's being done about it. âžĄïž [Read more](https://forum.arbitrum.foundation/t/disclosure-of-support-for-eip-2537-on-arbitrum-one-and-nova/29720?ref=blog.arbitrum.foundation) **Register $BORING in the Arbitrum generic-custom gateway** [https://superboring.xyz](https://superboring.xyz/?ref=blog.arbitrum.foundation) is about to expand to Arbitrum, thus the $BORING token shall become bridgeable to Arbitrum. âžĄïž [Join the discussion and vote](https://www.tally.xyz/gov/arbitrum/proposal/97685288731263391833044854304895851471157040105038894699042975271050068874277?govId=eip155:42161:0xf07DeD9dC292157749B6Fd268E37DF6EA38395B9&ref=blog.arbitrum.foundation) **Disable Legacy Tether Bridge** This proposal seeks to disable the legacy USDT bridge for Arbitrum One, given the activation of the new USDT0 bridge in January 2025. âžĄïž [Read more](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth/proposal/0xd5a66f784523841511f7ffec4171b9c14404fdbf7c205086312084d19c95c193) --- That’s all from Builder’s Block #1\. Thank you for reading, and keep building. Arbitrum Everywhere. ### Arbitrum’s $10M Audit Program Is Live: Apply to Secure Your Smart Contracts URL: https://blog.arbitrum.foundation/arbitrums-10m-audit-program-is-live-apply-to-secure-your-smart-contracts/ Last updated: 2025-08-03T17:12:47.000Z The Arbitrum Audit Subsidy Program is now accepting applications from blockchain projects building or planning to build in the Arbitrum ecosystem. The subsidy program, launched by the Arbitrum Foundation following DAO’s [approval](https://www.tally.xyz/gov/arbitrum/proposal/107606727309922720763027677505427395647796047780305505879344344641224024948240?govId=eip155:42161:0x789fC99093B09aD01C34DC7251D0C89ce743e5a4&ref=blog.arbitrum.foundation), **allocates $10M in ARB worth of grants and investments over 12 months** to subsidise third-party smart contract audits. This initiative is one of the largest audit subsidy programs currently available in the crypto industry. The program is designed to support early-stage projects within the Arbitrum ecosystem that demonstrate strong product-market fit and high growth potential. It aims to address funding barriers that often force early-stage projects to either allocate large portions of capital to security requirements or risk launching without proper audits. By making audits more accessible, the program helps raise the overall security and reliability of the Arbitrum ecosystem. ### **Meet the Auditors Powering the Program** The Foundation has already undertaken the process of [selecting](https://t.co/w4ab5SBCaR?ref=blog.arbitrum.foundation) audit firms to participate in the program. After a rigorous evaluation process involving over 30 applicants, the following **12 firms were approved** based on their expertise and track record: - [OpenZeppelin](https://x.com/OpenZeppelin?ref=blog.arbitrum.foundation) - [Certora](https://x.com/CertoraInc?ref=blog.arbitrum.foundation) - [Nethermind](https://x.com/NethermindEth?ref=blog.arbitrum.foundation) - [Trail of Bits](https://x.com/trailofbits?ref=blog.arbitrum.foundation) - [Ackee Blockchain Security](https://x.com/AckeeBlockchain?ref=blog.arbitrum.foundation) - [Oak Security](https://x.com/SecurityOak?ref=blog.arbitrum.foundation) - [Hexens](https://x.com/hexensio?ref=blog.arbitrum.foundation) - [Decurity](https://x.com/DecurityHQ?ref=blog.arbitrum.foundation) - [Pashov Audit Group](https://x.com/PashovAuditGrp?ref=blog.arbitrum.foundation) - [OXORIO](https://x.com/0xorio?ref=blog.arbitrum.foundation) - [Cyfrin](https://x.com/CyfrinAudits?ref=blog.arbitrum.foundation) - [Guardian](https://x.com/GuardianAudits?ref=blog.arbitrum.foundation) For more details on the auditor selection process and their responsibilities, please refer to this [forum post](https://forum.arbitrum.foundation/t/arbitrum-audit-program-audit-firms-application-process/29245?ref=blog.arbitrum.foundation). Approved firms will be matched with eligible projects and compensated (partially or fully) through the program’s subsidy grants, depending on the scope of work, auditor availability, and negotiation outcomes. ### **How to Apply: Audit Subsidy Program** Projects can apply to the Arbitrum Audit Subsidy Program through an open application process. The standardized form collects key details about the project, team, audit scope, and budget, ensuring a streamlined and fair review. [APPLY FOR AUDIT GRANTS](https://tally.so/r/3xzEzv?program=aap&ref=blog.arbitrum.foundation) Applications are reviewed on a rolling basis by the **Arbitrum Audit Committee**, which includes representatives from the Arbitrum Foundation, Offchain Labs, and [**Gustavo Grieco**](https://gustavo-grieco.github.io/?ref=blog.arbitrum.foundation), the technical expert [elected](https://snapshot.box/?ref=blog.arbitrum.foundation#/s:arbitrumfoundation.eth/proposal/0x131574819442cb6da293795ee9faeec4754a5af664b535b654b3d9d3d53f47e1) by the DAO. The committee evaluates each application based on: - Technical maturity - Team experience - Likelihood of success - Alignment with the Arbitrum ecosystem Early-stage projects that are yet to launch, are migrating from another chain, or are already operational in the Arbitrum ecosystem, whether on Arbitrum One or launching their own Arbitrum chain, are eligible to apply. But only new codebases or significantly modified code qualify for the subsidy. Once approved, projects are required to keep the audited code exclusive to Arbitrum for a set duration. For more details on the application process, please [visit this link](https://www.tally.xyz/gov/arbitrum/proposal/107606727309922720763027677505427395647796047780305505879344344641224024948240?govId=eip155:42161:0x789fC99093B09aD01C34DC7251D0C89ce743e5a4&ref=blog.arbitrum.foundation). The Audit Subsidy Program is a major step forward in making smart contract security more accessible. If you're building on Arbitrum, now’s the time to apply and launch with confidence! ### Build a Farcaster Mini App with Arbitrum in Minutes URL: https://blog.arbitrum.foundation/build-a-farcaster-mini-app-with-arbitrum-in-minutes/ Last updated: 2025-07-29T19:39:54.000Z A few weeks ago at a developer workshop I facilitated in Berlin, I saw something fantastic: genuine interest in building on-chain. These were traditional developers, not chasing hype, but asking real questions about how to ship fast, including in social experiences. That energy matches a broader trend: the rise of **SocialFi**. Developers want to build applications include social graphs, not just around them. Farcaster is leading the way, offering powerful new primitives like Mini Apps that bring interactivity directly into the feed. At the same time, **Arbitrum Stylus** is unlocking smart contract development in battle-tested languages like Rust. It combines WebAssembly performance, modern developer tooling, and full EVM interoperability. Put the two together, and you get something powerful: composable, on-chain social apps written in Rust that live inside Farcaster. 0:00 /3:36 1× Watch the 3-minute video for a full rundown of what's covered ## Why Farcaster Mini Apps? Mini Apps are one of the most exciting new surfaces for onchain UX. They let you embed interactive apps right inside a Farcaster cast similar to link previews, but actionable and programmable. With Mini Apps, users can connect their wallets, either the Farcaster native wallet or any EVM-compatible wallet, and interact directly within the app itself. Whether you're minting NFTs, submitting votes, or launching games, the interaction feels seamless and native. This surface is more than a gimmick. It’s a shift toward making the feed itself the interface for blockchain apps. ## Getting Started To help kickstart exploration in this space, I put together a new open-source project: [GitHub - hummusonrails/farcaster-arbitrum-miniapp-starter: Template to begin creating a Farcaster Mini-App with ArbitrumTemplate to begin creating a Farcaster Mini-App with Arbitrum - hummusonrails/farcaster-arbitrum-miniapp-starter![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/icon/pinned-octocat-093da3e6fa40-1.svg)GitHubhummusonrails![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/thumbnail/farcaster-arbitrum-miniapp-starter)](https://github.com/hummusonrails/farcaster-arbitrum-miniapp-starter?ref=blog.arbitrum.foundation) It’s a full-stack template for developers who want to build SocialFi apps that run on-chain, featuring a modern TypeScript frontend, wallet integration, and a Stylus-powered smart contract all integrated. ### What's Included This is not a bare-bones scaffold. It’s designed to be used as the starting point for real projects. Here's what you get out of the box: #### Frontend - A **React + Vite + Tailwind** frontend that works in both browsers and inside Farcaster casts - **Wallet support** via Wagmi and Viem, including both browser wallets (like MetaMask) and Farcaster native wallets - A built-in **minting flow** that lets users interact with an NFT contract and see their collected tokens in a simple gallery - All the correct **Farcaster meta tags and manifest files**, so your app renders as a mini app inside a cast #### Smart contract - A **Rust ERC721 contract** using Arbitrum Stylus and the OpenZeppelin Stylus Rust crate - Easy commands to build, deploy, and export the contract’s ABI - A mint function that automatically assigns new token IDs, along with inline metadata via `tokenURI` - Scripts to fund test wallets, run a local Arbitrum test node, and estimate gas #### Developer tooling - Everything is inside a monorepo with `pnpm`, using isolated workspaces for the frontend, contracts, and utility scripts - Uses test accounts with pre-funded ETH so you can start interacting immediately This lets you get straight to building the parts that matter instead of setting up boilerplate. #### Local development with `ngrok` Mini Apps require your frontend to be served over HTTPS to be previewed inside Farcaster, even during development. That's where [ngrok](https://ngrok.com/?ref=blog.arbitrum.foundation) comes in. It creates a secure tunnel from your local dev server to the public Internet, making it easy to test your app live. Here’s a sample `ngrok.yml` config: ```yaml tunnels: web5173: proto: http addr: 5173 web8547: proto: http addr: 8547 ``` Then just run: ```bash ngrok start --all ``` Once that’s running, you’ll get public HTTPS URLs like: ```bash https://fancy-sky-5173.ngrok.app https://fancy-sky-8547.ngrok.app ``` Update your frontend to use the new RPC URL from `web8547`, and paste the frontend URL into [Farcaster’s Mini App Previewer](https://farcaster.xyz/~/developers/mini-apps/preview?ref=blog.arbitrum.foundation). Your cast will now load the local app as if it were hosted in production. For more details, please take a look at the official [ngrok documentation](https://ngrok.com/docs?ref=blog.arbitrum.foundation). ## Ideas for What to Build Use this starter template as a launchpad for SocialFi experiments: - A simple mint-to-collect app - On-chain voting or polls - Social games and interactive challenges - Airdrop claim flows or badge minting - Reputation systems - DAO member tools that live in the feed The possibilities are expansive. The key is you build *inside* the social graph, not just next to it. ## Hacking with the Starter You can be up and running in minutes: 1. Clone the [repo](https://github.com/hummusonrails/farcaster-arbitrum-miniapp-starter?ref=blog.arbitrum.foundation) 2. Install dependencies with `pnpm install` 3. Run the dev node and the frontend 4. Use `ngrok` to expose it for testing 5. Load it into the [Farcaster Mini App Previewer](https://farcaster.xyz/~/developers/mini-apps/preview?ref=blog.arbitrum.foundation) Whether you're just curious about Stylus or serious about building composable on-chain experiences, this starter gives you everything you need to dive into Farcaster + Arbitrum development fast. 🔗 [github.com/hummusonrails/farcaster-arbitrum-miniapp-starter](https://github.com/hummusonrails/farcaster-arbitrum-miniapp-starter?ref=blog.arbitrum.foundation) Follow the README for setup instructions, and use it as inspiration for your project. If you build something with it, let me know. I’d love to see what you come up with. Happy hacking. ### Trailblazer 2.0: $1M in Grants to Power Agentic DeFi on Arbitrum URL: https://blog.arbitrum.foundation/trailblazer-2-0-1m-in-grants-to-power-agentic-defi-on-arbitrum/ Last updated: 2025-06-18T09:09:47.000Z DeFi on Arbitrum is evolving, and with it, a new wave of intelligent, onchain innovation is emerging. To support this momentum, the Arbitrum Foundation is launching **Trailblazer 2.0**, a $1M funding program focused on supporting impactful DeFi agents and contributions built with **Vibekit**, a new Arbitrum-native MCP agent framework developed by [Ember](https://x.com/EmberAGI?ref=blog.arbitrum.foundation). This iteration of Trailblazer builds on the success of the [original $1M Trailblazer AI Grant Program](https://arbitrumfoundation.medium.com/trailblazer-1m-grants-to-power-ai-innovation-on-arbitrum-c6de1200e656?ref=blog.arbitrum.foundation), which helped onboard dozens of AI projects to the Arbitrum ecosystem. With Trailblazer 2.0, we’re doubling down on the ideas and builders that can leverage DeFi — by supporting performant DeFi agents and direct contributions to Vibekit with funding**.** ### Grant Overview We’re offering $1 million in grants to support builders who launch agents, agent templates, or any of the contributions below with VibeKit, demonstrating clear utility and performance, with a cap of $10k per submission. This includes: - **DeFi Agents** — Agents executing profitable or innovative strategies using Arbitrum DeFi - **Agent Add-ons & Plug-ins** — Modular extensions that enhance agent capabilities - **Open Source Agent Templates** — Shareable blueprints others can use to spin up new agents - **Capability Integrations** — Tooling or services that plug into agents to unlock new use cases Prioritized contributions could include: - Templates that **execute complex DeFi strategies** - The creation of a backtesting suite for Vibekit agents - Agentic DeFi Mini Apps in Farcaster - Open source contributions that **expand the utility** of the broader VibeKit agent ecosystem — Frontend components such as trading history for Vibekit agents, P&L calculation, etc You can also explore Ember’s [bounty board](https://github.com/orgs/EmberAGI/projects/13?ref=blog.arbitrum.foundation) to collaborate with them directly on your Vibekit contributions. If you’ve deployed an AI agent, created an agent template using Vibekit, or contributed to Vibekit, **you may be eligible for funding.** Submit your deployed agent, template, or contribution [here](https://docs.google.com/forms/d/e/1FAIpQLSe-GF7UcUOuyEMsgnVpLFrG%5FW83RAchaPPqOCD83pZaZXskgw/viewform?ref=blog.arbitrum.foundation). ### Arbitrum Vibekit [Vibekit](https://vibekit.ai/?ref=blog.arbitrum.foundation) is a growing Arbitrum-native MCP agent framework for building autonomous DeFi agents created and maintained by Ember. It enables developers to design agents that are modular, composable, and deeply integrated with Arbitrum’s high-speed, low-cost infrastructure, with integrations into Arbitrum DeFi. On launch, Vibekit has support for Pendle, GMX, Aave, and Camelot, with the ability for any Arbitrum team to integrate their protocols directly into Vibekit. Hyperbolic, Playgrounds, Eliza, Trendmoon, and Allora are also supported as tools within Vibekit. Over time, Vibekit will be upgraded with added features by the Ember team alongside contributions from the community to make it the go-to agent kit for the Arbitrum DeFi ecosystem. Start contributing to Vibekit [here](https://github.com/EmberAGI/arbitrum-vibekit/blob/main/CONTRIBUTIONS.md?ref=blog.arbitrum.foundation). ### Driving Innovation A sustainable ecosystem thrives on community-level innovation and collaboration — this is why we’re so excited to see what contributions will come from Vibekit! Whether it’s making yield searching 10x easier or creating a new DeFi primitive with the help of agentic strategy, we want to see it come from you and be accessible to any user in the community. Arbitrum Everywhere. ### ArbiFuel Is Live: Arbitrum Builders, Claim Your Gas Fee Sponsorship URL: https://blog.arbitrum.foundation/arbifuel-is-live-arbitrum-builders-claim-your-gas-fee-sponsorship/ Last updated: 2026-05-07T10:27:15.000Z At Arbitrum, builders come first. That’s why we’re launching ArbiFuel, a Gas Fee Sponsorship Program to help early-stage teams ship faster, test freely, and onboard users without worrying about gas costs. As the ecosystem evolves with upgrades like Pectra and EIP-7702, the push toward native smart account support is accelerating, and Arbitrum is ready to help teams take advantage of these new capabilities and bring fresh ideas to life. ### Ready to Gas Up? ArbiFuel Program Breakdown Whether you’re exploring smart wallets, onboarding UX, or payment-related applications, Arbitrum will back you with the scalability, tooling, and now, the gas to build user-friendly applications. The Arbitrum Foundation welcomes the following to apply for gas sponsorship under ArbiFuel: - Early-stage developers working on simplified UX apps - Wallet providers and stablecoin-related products - Teams exploring payment-related applications The program will power your users with a seamless, cost-free entry into your application. - Selected projects will get sponsorship of **up to 1,000,000 free transactions in their first year** following the start of the gas sponsorship, **capped at $10,000 in credits per team.** - Initially, the sponsorship is powered by **Pimlico’s ERC-20 Paymasters**, with plans to expand to other Paymasters based on project needs. 👉**Apply now:** [**ArbiFuel Gas Sponsorship Application Link**](https://airtable.com/appzb4GfqGfrnDXjW/shrulGIIp6l6ezAlt?ref=blog.arbitrum.foundation) ### Explore Other Ecosystem Opportunities Didn’t qualify for ArbiFuel, or looking for additional builder-focused initiatives? No worries, the Arbitrum ecosystem is rich with programs designed to support innovation across domains. Here are some standout opportunities currently active: - [**AI Trailblazer**](https://arbitrumfoundation.medium.com/trailblazer-1m-grants-to-power-ai-innovation-on-arbitrum-c6de1200e656?ref=blog.arbitrum.foundation): A $1M initiative from the Arbitrum Foundation that provides grants to builders developing specialized AI agents and other onchain AI products on Arbitrum chains. - [**Arbitrum Grants by Questbook**](https://arbitrum.questbook.app/?ref=blog.arbitrum.foundation): Delegated Domain Allocation 3.0 is a year-long, $6.75M grant program approved by ArbitrumDAO and run by Questbook, spanning five domains — New Protocols and Ideas, Dev Tooling, Gaming, Education + Events, and the new experimental Orbit domain. - [**Alchemy’s Arbitrum Grant Fund**](https://www.alchemy.com/arbitrum-grant?ref=blog.arbitrum.foundation): Alchemy has committed $10M to support Arbitrum builders launching Orbit chains, offering up to $500K per project. - [**Arbitrum Gaming Ventures (AGV)**](https://arbitrumgamingventures.com/?ref=blog.arbitrum.foundation): Backed by 225M ARB from the ArbitrumDAO, AGV is a venture initiative aimed at funding and partnering with game studios and publishers building on the Arbitrum tech stack. - [**Onchain Labs**](https://medium.com/offchainlabs/onchain-labs-accelerating-the-app-layer-of-arbitrum-1ac2b64eeae3?ref=blog.arbitrum.foundation): A joint initiative by Offchain Labs and the Arbitrum Foundation to accelerate onchain experiences. Early-stage teams expanding the Arbitrum application layer can receive product, IT, and GTM support directly from Offchain Labs. - [**Arbitrum Audit Program**](https://www.tally.xyz/gov/arbitrum/proposal/107606727309922720763027677505427395647796047780305505879344344641224024948240?govId=eip155:42161:0x789fC99093B09aD01C34DC7251D0C89ce743e5a4&ref=blog.arbitrum.foundation)**:** A 1-year, 30M ARB initiative approved by the DAO to subsidize security audits for Arbitrum projects. The Audit Committee is currently being formed, with applications opening soon. ### **Educate to Strengthen Your Application** As part of the ArbiFuel program, we encourage teams to actively educate their communities about their presence on Arbitrum and the opportunity to benefit from gasless transactions on Arbitrum protocols. Community education and awareness can strengthen your chances of receiving gas sponsorship. In your application, please share: - Links to your X (formerly Twitter) posts about your presence on Arbitrum - Any updates to your social bio referencing Arbitrum - A demo of an in-app sticky banner - Any other creative marketing tactics you’ll use to raise awareness Let’s build the future of Web3 without the gas friction. ### The ArbitrumDAO Turns 2: Welcome to the Land of Liquidity URL: https://blog.arbitrum.foundation/the-arbitrumdao-turns-2-welcome-to-the-land-of-liquidity/ Last updated: 2025-06-16T06:30:16.000Z Two years ago, ArbitrumDAO came to life to put the future of Ethereum scaling into the hands of the community. Today, the Arbitrum Foundation is proud to celebrate this milestone alongside one of the most active, dedicated, and innovative communities in Web3. In just 24 months, ArbitrumDAO has evolved into a leading model of decentralized governance — efficient, forward-thinking, and community-driven. Before we reveal our anniversary gift (yes, it’s mintable), let’s look back at some of the biggest wins from the Land of Liquidity. #### **DAO Activity** The ArbitrumDAO has established itself as a benchmark for transparent, inclusive, and active governance. Here’s a snapshot of its activity over the last two years: - **72** onchain proposals voted on via Tally - **364** temperature checks on Snapshot - **153** proposals discussed on the Arbitrum Forum On average, the DAO has voted on approximately 4 proposals each week. Notably, nearly 70% of delegated voting power is active — a level of participation that sets the standard for DAOs everywhere. For instance, the recent Timeboost proposal saw 245 million votes cast out of a total 345 million delegated. This is a huge testament to the activity and engagement of the DAO, demonstrating its commitment to shaping Arbitrum’s future. #### **Treasury** As of this post, the ArbitrumDAO treasury holds roughly **2.8 billion ARB**. Over the last two years, the DAO has not only functioned as an allocator of capital but also as a self-sustaining economy earning returns from its investments alongside transaction fee revenue. The DAO has generated around **20,000 ETH in profit** during this period and continues to diversify its holdings into more stable, yield-bearing assets such as Real-World Assets (RWAs). #### **DAO Initiatives** The DAO has deployed over **750M ARB** across a range of initiatives that have fueled growth across every corner of the ecosystem. Some notable highlights include: Some highlights: - **250M ARB** to bolster the Arbitrum Foundation’s Strategic Partnership Budget - **225M ARB** to establish the Gaming Catalyst Program (GCP) - **157M ARB for** incentive programs (STIP, LTIPP, ancillary programs) - **70M ARB** into RWAs via the Stable Treasury Endowment Program (STEP) - **30M ARB** to establish the OpCo - **27.5M ARB** for Domain Allocator Offering (D.A.O) Grants via Questbook - **12.1M ARB** for 2 iterations of the Delegate Incentive Program Every one of these moves reflects the DAO’s belief in building public goods, supporting innovation, and fostering resilience through community-owned infrastructure. #### Governance of Arbitrum Technology While the development of Arbitrum technology began in 2014, it was in 2023 that the ArbitrumDAO formally assumed governance of **Arbitrum One** and **Arbitrum Nova**. Since then, the community has taken an active role in shaping the evolution of the network. Over the past year alone, the DAO has passed **five key technical proposals** that reinforce Arbitrum’s position at the forefront of Ethereum scaling. Notable examples include **Stylus**, **BoLD**, and **Timeboost,** each contributing to the continued advancement and resilience of the protocol. #### **Mint Your Piece of History** We want to thank every builder and community member who has helped bring liquidity and vitality to the Arbitrum ecosystem. To celebrate this anniversary and the accomplishments of the Arbitrum ecosystem as a whole, we’re excited to introduce **“The ArbitrumDAO 2nd Anniversary: Welcome to the Land of Liquidity,”** a special open edition NFT available on **Magic Eden**, one of the largest NFT marketplaces. This one-of-a-kind artwork, created by **Perchy** ([@TheFutureisDAO1](https://x.com/TheFutureisDAO1?ref=blog.arbitrum.foundation)), captures the collaborative spirit, values, and shared history of the ArbitrumDAO — a journey that has been years in the making. **Claim your NFT now on Magic Eden:** [https://magiceden.io/launchpad/arbitrum/arbitrum-dao](https://magiceden.io/launchpad/arbitrum/arbitrum-dao?ref=blog.arbitrum.foundation) Here’s to the next chapter and everything we’ll build together in year three. ### Greater China and the Philippines Join the Arbitrum Ambassador Program Expansion URL: https://blog.arbitrum.foundation/greater-china-and-the-philippines-join-the-arbitrum-ambassador-program-expansion/ Last updated: 2025-06-16T06:30:17.000Z The Arbitrum Ambassador Program took a significant leap forward in Q1 2025 by expanding to new regions. The Arbitrum Foundation is now thrilled to announce the expansion to two more regions: **Greater China and the Philippines**. This expansion brings the Ambassador Program to a total of seven active countries, including India, Nigeria, Mexico, Korea, and Brazil. The expansion into Greater China — covering mainland China, Hong Kong, Macau, and Taiwan — marks a major milestone for the Arbitrum ecosystem. This region is home to one of the world’s most vibrant and innovative Web3 communities. By introducing the Ambassador Program here, the Arbitrum Foundation aims to harness the talent and enthusiasm of local Web3 enthusiasts, enabling them to contribute to content creation and educational activities in **Mandarin Chinese.** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/0-2z0bnxuu-vnclojy.png) Ed Felten, Co-Founder at Offchain Labs, announcing the Mandarin Ambassador Track at ArbiLink 2025, Hong Kong. As part of the outreach efforts in Greater China, t**he Arbitrum Foundation will collaborate with HackQuest**, a leading developer-focused educational platform in the region. Together, they will train and empower a new cohort of ambassadors and undertake university outreach programs to inspire and engage the next generation of Web3 talent across campuses. The Ambassador Program is an Arbitrum Foundation initiative to build a grassroots community in the ecosystem. The program empowers ambassadors to represent Arbitrum locally, educating users and developers while strengthening the global Web3 network. Through educational initiatives, advocacy, and content creation, ambassadors play a pivotal role in propelling the ecosystem to new heights. Since August 2024, ambassadors have submitted roughly 14,750 pieces of content, both technical and non-technical, via X (formerly Twitter) that earned 187 million overall reach for the Arbitrum ecosystem. Learn more about the Ambassador Program expansion [here](https://arbitrumfoundation.medium.com/arbitrum-ambassador-program-expands-to-new-regions-178b7a5463cc?ref=blog.arbitrum.foundation). **Who should apply** If you are passionate about Arbitrum technology from Greater China or the Philippines and are interested in creating an impact through social media presence and community engagement in Mandarin, this program is for you! The Ambassador Program is a great opportunity to leverage Arbitrum’s community support to elevate your profile as a Web3 community leader, connect with industry experts, and gain invaluable experience building a thriving Web3 community. [Apply here](https://arbitrum.foundation/ambassador?ref=blog.arbitrum.foundation) to become an Arbitrum Ambassador today. ### Arbitrum Ambassador Program Expands to New Regions URL: https://blog.arbitrum.foundation/arbitrum-ambassador-program-expands-to-new-regions/ Last updated: 2025-06-16T06:30:18.000Z The Arbitrum Foundation is excited to announce the expansion of the Arbitrum Ambassador Program to new regions in 2025\. The expansion will begin with the launch of **dedicated regional tracks in Korea and Brazil** in addition to existing locations — India, Nigeria, and Mexico. The Ambassador Program is an Arbitrum Foundation’s initiative to build a grassroots community in the ecosystem. The program empowers members to represent Arbitrum in their local communities by encouraging them to educate users and developers about Arbitrum technology and create a global network of dedicated community builders who can propel the ecosystem to new heights. ### Expansion to Korea and Brazil The Arbitrum Ambassadors program was launched in 2023 as a community-building initiative. The program has since optimized and grown from a student-led initiative focused on university events to include Web3 proponents from all walks of life. In 2024, the program was [reignited](https://arbitrumfoundation.medium.com/arbitrum-ambassador-program-phase-2-kicks-off-in-nigeria-india-mexico-7646f746e236?ref=blog.arbitrum.foundation) with a dedicated focus on three key regions (India, Nigeria, and Mexico) with high advocacy to experiment and expand beyond events. Alongside community engagements via regional IRL events, emphasis was placed on online content creation and developer onboarding. Since August 2024, ambassadors submitted roughly 1,200 pieces of high-quality content, both technical and non-technical, via X (formerly Twitter) that earned a stunning reach of over 122 million for the Arbitrum ecosystem. In light of the above success, the Arbitrum Foundation is expanding to two additional regions in Q1 2025 — Korea and Brazil. Both countries have shown strong community participation organically and bring great value to the Arbitrum ecosystem. ### What’s New All ongoing ambassador activities — including in-person and online events, community engagement via content creation, and developer onboarding — will continue as usual. In addition, the Ambassador Program will expand its focus to: - **Onboarding ambassadors from New Regions:** Applications are now open in Korea and Brazil, joining our existing regions of India, Nigeria, and Mexico. - **Strengthen Regional Engagement:** By introducing language-based content grants, Ambassadors will be encouraged to produce high-quality content in their native languages, including Korean, Spanish, and Portuguese. ### Who should apply If you are passionate about Arbitrum technology from Korea or Brazil and interested in creating an impact through social media presence and community engagement in your regional language, this program is for you! The Ambassador Program is a great opportunity to leverage Arbitrum’s community support to elevate your profile as a Web3 community leader, connect with industry experts, and gain invaluable experience building a thriving Web3 community. [Apply here](https://arbitrum.foundation/ambassador?ref=blog.arbitrum.foundation) to become an Arbitrum Ambassador today. ### FAQs **1\. What are the activities an ambassador can do?** Ambassadors are tasked with the growth and development of the Arbitrum ecosystem through education programs. This includes activities such as online content creation, organizing community meetups, conducting technical workshops, and helping onboard developers. **2\. I’m not from Korea or Brazil, can I apply?** Currently, we are accepting applications from existing locations (India, Nigeria, and Mexico) and new regions (Korea and Brazil). If you are from any other region, we request you to stay tuned as we plan to add more regions in 2025. **3\. I’m only interested in organizing events, can I apply?** To be able to participate in the Ambassador program fully, we expect applicants to have a strong social presence as a primary criterion. **4\. What are the benefits of applying to the program?** As an Arbitrum Ambassador, you’ll forge valuable connections within the Arbitrum community, collaborate with fellow ambassadors, and gain access to experts in the ecosystem. Beyond growing your social media presence and portfolio, you’ll hone your content curation and social marketing skills through hands-on experience and training programs. 5\. **When can we expect new regions to be open?** Currently, the focus is on Korea, Brazil, India, Nigeria and Mexico. In due time, we will notify you about the other regions. **6\. Where can I apply?** Please apply via [https://arbitrum.foundation/ambassador](https://arbitrum.foundation/ambassador?ref=blog.arbitrum.foundation) **7\. Who can I talk to for more info?** Feel free to email [ambassadors@arbitrum.foundation](mailto:ambassadors@arbitrum.foundation) for more information about this program. ### Trailblazer: $1M Grants To Power AI Innovation on Arbitrum URL: https://blog.arbitrum.foundation/trailblazer-1m-grants-to-power-ai-innovation-on-arbitrum/ Last updated: 2025-06-16T06:30:20.000Z We’re thrilled to announce the **Trailblazer AI** **Grant Program**, a $1,000,000 initiative designed to provide immediate grant support to innovative builders creating specialized AI agents and other onchain AI products on Arbitrum chains. The Arbitrum ecosystem is emerging as a natural choice for AI builders exploring seamless onchain integrations. [Allora Network](https://x.com/AlloraNetwork?ref=blog.arbitrum.foundation), [ARC Agents](https://x.com/ARCAgents?ref=blog.arbitrum.foundation), [Eternal AI](https://x.com/CryptoEternalAI?ref%5Fsrc=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor&ref=blog.arbitrum.foundation), [Hyperbolic](https://x.com/hyperbolic%5Flabs?ref%5Fsrc=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor&ref=blog.arbitrum.foundation), and [Ora](https://x.com/OraProtocol?ref=blog.arbitrum.foundation) are some of the many projects that leverage Arbitrum’s low latency, high throughput, and low fee infrastructure as part of their AI tech stack. The Trailblazer initiative aims to further unleash AI innovation within the Arbitrum ecosystem by extending grants to bold and innovative builders to develop and deploy impactful AI products on Arbitrum. The program’s goal is to onboard thousands of diverse AI agents and applications onto the Arbitrum ecosystem. Whether you’re a visionary innovating with a groundbreaking idea or a seasoned developer with a live project, we encourage you to [apply today](https://docs.google.com/forms/d/e/1FAIpQLSe-GF7UcUOuyEMsgnVpLFrG%5FW83RAchaPPqOCD83pZaZXskgw/viewform?ref=blog.arbitrum.foundation) and receive the resources needed to bring your AI agent to life. ### Grants Overview We’re offering a total of $1,000,000 in grants to support the most promising AI agent projects. Each individual project is eligible for up to $10,000 and must involve an already launched AI agent featuring an onchain integration with Arbitrum. Trailblazer grants will be awarded to projects that demonstrate: - **Innovation:** Cutting-edge ideas and novel approaches to AI. - **Impact:** Potential to drive user engagement and ecosystem growth. - **Uniqueness:** Distinctive features and functionalities. - **Adoption Potential:** Ability to attract new users and drive on-chain activity. - **Alignment with Arbitrum:** Synergy with Arbitrum’s mission and values. The program takes a holistic approach by providing mentorship and guidance from industry experts along with monetary support. Trailblazer projects will have access to Arbitrum’s vibrant community of like-minded developers and innovators. By joining the program, you will also have the opportunity to showcase your project to a global audience and earn recognition for your contributions to the Arbitrum ecosystem. **What We’re Looking For** We’re seeking innovative AI agents and applications that push the boundaries of AI with unique approaches while leveraging the power of Arbitrum’s decentralized infrastructure. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/0-heaqgrc_ij9mzote.png) AI Builders can explore a vast array of innovative applications from NFTs to ERC-20 Tokens. Our team and partners have put together a list of intriguing ideas, including: - **Creative Agents:** Agents that generate art using Rust contracts on Stylus - **Self-Upgrading Agents:** Agents capable of upgrading their own software - **Sophisticated Trading Agents:** Agents that execute complex token trades and interactions such as maker or taker orders on Perpetual DEXs - **Strategic DeFi Agents:** Agents capable of devising complex, multi-step DeFi strategies, bonus points if they can execute them! - **Community-Engagement Agents**: Agents that assist DAO delegates and participants and enhance gaming communities and PvE gameplay - **Efficient Network Agents:** Agents for routing orders across Orbit chains - **Collaborative Agents:** Agents that launch swarms to delegate tasks to other agents - **Additional Frameworks:** Bring other frameworks like ai16z’s Eliza to Arbitrum - **Versatile Smart Contract Agents:** Agents that utilize Rust smart contracts with Stylus to implement any of the above ideas These are just some examples. We encourage builders to think creatively and innovate with different concepts to unlock the full potential of AI on Arbitrum. ### How to Apply Ready to revolutionize AI with Arbitrum? Apply for the Trailblazer program using this [application form](https://docs.google.com/forms/d/e/1FAIpQLSe-GF7UcUOuyEMsgnVpLFrG%5FW83RAchaPPqOCD83pZaZXskgw/viewform?ref=blog.arbitrum.foundation) in just a few steps. Don’t miss this opportunity to shape the future of AI on Arbitrum. ### Welcome to the Stylus Blitz Hackathon URL: https://blog.arbitrum.foundation/welcome-to-the-stylus-blitz-hackathon/ Last updated: 2025-06-16T06:30:20.000Z Stylus is live on Arbitrum Sepolia! And we can’t wait for builders to experiment. We’re thrilled to announce the **Stylus Blitz Hackathon** to inspire developers to leverage the power of Stylus contracts. With Stylus set to go live on Arbitrum Sepolia on June 17, 2024, this is your chance to build something powered by the MultiVM. ### $15,000 for Stylus builders on Arbitrum Sepolia We’re offering a total grant pool of $15,000, which will be distributed among 10 projects. Each selected project will receive a grant of $1,500\. By offering a larger number of grants, we aim to encourage a wide breadth of developers and teams to participate. ### Why Stylus? Stylus is a game-changer for the EVM, empowering developers in the Arbitrum ecosystem to write smart contracts in a variety of languages, including Rust. By leveraging the power of the WASM VM, Stylus contracts offer unparalleled efficiency, with 10x cheaper compute and memory compared to traditional EVM contracts. Moreover, Stylus contracts are fully interoperable with the EVM, meaning you can seamlessly integrate them with existing Arbitrum protocols. ### Who is the Stylus Blitz for? The Stylus Blitz is open to developers from all backgrounds who are eager to explore the possibilities of Stylus contracts. Whether you’re interested in experimenting with Stylus-specific use cases that go beyond the capabilities of Solidity, or you’re looking to migrate your existing Solidity protocols to Stylus to save on gas costs, the Blitz is for you. We encourage developers with a passion for innovation and a desire to push the boundaries of smart contract development to participate. If that sounds like you, join us in the Stylus Blitz Hackathon and be part of the revolution in smart contract development. ### Blitz Timeline The Stylus Blitz Hackathon will run for approximately two weeks, starting from when Stylus hits Arbitrum Sepolia on June 17, 2024, until June 30, 2024\. During this time, you’ll have the opportunity to build and deploy your own Stylus contracts. The project submission window will open for the last week of the build timeline, from June 24, 2024, to June 30, 2024\. Our judges will then have one week, from July 1, 2024, to July 7, 2024, to evaluate the submissions and select the grant recipients. - [Kick Off Livestream Q&A Session: Tuesday, June 18, 2024 12:00pm ET](https://www.youtube.com/watch?v=qeTlVxMlecg&ref=blog.arbitrum.foundation) [Watch it now!](https://www.youtube.com/watch?v=qeTlVxMlecg&ref=blog.arbitrum.foundation) - Stylus Blitz Official Build Time: June 17, 2024 to June 30, 2024 - Project Submission Window: June 24, 2024 to June 30, 2024 - Judging Period: July 1, 2024 to July 7, 2024 - Selected Projects Announced: July 8, 2024 - Grants will be paid within 30 days of announcing winners ### Judging The project submission window will open for the last week of the event. During this time, participants will have the opportunity to submit their Stylus projects for review. The judges will then have an additional week to carefully review the submissions and select the 10 projects that will receive the grants. **You can submit your project submissions** [**here**](https://docs.google.com/forms/d/1W%5Fp8g-kSScHoDPHe036pB7YbaQym6MhWRHMeKS6J5ss/edit?ref=blog.arbitrum.foundation)**.** ### Eligibility Requirements To be eligible for the Stylus Blitz grants, your project must meet the following criteria: - It must be a Stylus contract deployed on Arbitrum Sepolia. - Tooling and infrastructure projects that support Arbitrum Stylus also qualify - Submissions must be made by the original developer(s) - Preference will be given to Stylus contracts that interact with other EVM contracts View [Privacy Policy](https://arbitrum.foundation/privacy?ref=blog.arbitrum.foundation) and [Terms and Conditions](https://docs.google.com/document/d/1uaJlzp1WmZ5NmvPDWBVr7A%5FaHrC4AhaS/edit?ref=blog.arbitrum.foundation). ### Resources Get ready to build, innovate, and make your mark with Stylus on Arbitrum Sepolia! If you need some help along the way, the [Arbitrum Stylus Hacker Toolkit](https://www.notion.so/arbitrum/Arbitrum-Hacker-Tool-Kit-Stylus-and-more-375a142fcbee4e6a8c62bd0022f13138?pvs=4&ref=blog.arbitrum.foundation) has everything you’ll need. Here are a few starter links: - Documentation [Stylus: A Gentle Introduction](https://docs.arbitrum.io/stylus/stylus-gentle-introduction?ref=blog.arbitrum.foundation) - Stylus SDK Repo [https://github.com/OffchainLabs/stylus-sdk-rs](https://github.com/OffchainLabs/stylus-sdk-rs?ref=blog.arbitrum.foundation) #### Submit your projects [here](https://docs.google.com/forms/d/1W%5Fp8g-kSScHoDPHe036pB7YbaQym6MhWRHMeKS6J5ss/edit?ref=blog.arbitrum.foundation). Follow us on X ([@arbitrum](https://twitter.com/arbitrum?ref%5Fsrc=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor&ref=blog.arbitrum.foundation), [@arbitrumcore](https://twitter.com/arbitrumcore?lang=en&ref=blog.arbitrum.foundation) and [@ArbitrumDevs](https://twitter.com/arbitrumcore?lang=en&ref=blog.arbitrum.foundation)) and for the latest updates from the Arbitrum ecosystem. ### Arbitrum Ambassador Program Phase 2 Kicks Off in Nigeria, India & Mexico URL: https://blog.arbitrum.foundation/arbitrum-ambassador-program-phase-2-kicks-off-in-nigeria-india-mexico/ Last updated: 2025-06-16T06:30:22.000Z The Arbitrum Foundation is excited to announce the launch of Phase 2 of the Arbitrum Ambassador Program in Nigeria, India and Mexico, which have been hotspots of community engagement for the ecosystem. Starting today, the scope of our ambassador initiatives will extend beyond university students (as in Phase 1) to Web3 enthusiasts from all walks of life. Dynamic advocates with strong social media presence and passion for new technology will play a key role in driving education programs for the Arbitrum ecosystem. A key highlight of Phase 2 will be the emphasis on digital content creation by ambassadors and building online communities that transcend borders as much as on hosting IRL workshops and hackathons in their local communities. ### Phase One Recap Launched in Q3 2023, Arbitrum Ambassador Program is a community and ecosystem initiative to support technical and non-technical contributors excited about Arbitrum technology to learn, build, and educate audiences virtually as well as in person. Under Phase 1, the main focus was on students and universities. More than 3000 applications were received of which 160 were accepted as Arbitrum Ambassadors across 36 counties, including university-based blockchains clubs such as Harvard Blockchain Club, Princeton Blockchain Club, 404DAO, FranklinDAO, and more. Collectively, these ambassadors organized 30 plus IRL events, including technical workshops, and produced 100 plus high-quality content resources for the community to use. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-osx9m_d5mti2yzcp68adiq.png) We thank all our ambassadors for making Phase 1 of the program a grand success and look forward to the continued success. ### Phase Two: What activities are included? As an advocate of the largest L2 protocol, ambassadors are primarily tasked with the growth and development of the Arbitrum ecosystem through education programs. This may include activities such as (but not limited to): - **Online content creation:** Producing high-quality technical and non-technical content, ecosystem related updates, etc. - **Online events and meet-ups:** Organizing and hosting online events, virtual meet-ups and AMAs - **Community Engagement:** Activating community participation through IRL meet-ups and local events - **Developer Onboarding:** Helping developers onboard by facilitating developer tooling, technical workshops and hackathons ### Why be a part? The Ambassador Program is a great opportunity to leverage Arbitrum’s community support to grow your social media presence and portfolio while helping the ecosystem thrive. By joining the program, you will have the benefit of: - Presenting Arbitrum in your local community as an official ambassador - Working closely with Ecosystem’s biggest protocols - Learning about scaling and Layer-2 technologies from industry leaders - Honing digital content creation and social amplification skills - Networking with key players in the community - And becoming a part of a rapidly growing L2 ecosystem ### Who can apply? If you are passionate about what Arbitrum does and is interested in creating an impact through social media presence and community engagement, this program is for you! The Arbitrum Ambassador Program Phase 2 applications are currently open to participants from Nigeria, India, and Mexico. ### Apply Today! The launch of Phase 2 of Arbitrum Ambassador Program represents dedication to fostering a more vibrant ecosystem of builders and users worldwide. By becoming an ambassador, you will enjoy the full opportunity to organize and host local in-person events, develop content, build ecosystem tools, and learn more about Arbitrum technology. [Apply here](https://docs.google.com/forms/d/1bWHIZ4qpw5ry7Atca8yD%5FJ0gbQREH7NklYS0s8ujgGk/edit?ts=661412c1&ref=blog.arbitrum.foundation) to join the Ambassador program and embark on this transformative journey to shape the future of Arbitrum and Web3. Follow us on X ([@arbitrum](https://twitter.com/arbitrum?ref%5Fsrc=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor&ref=blog.arbitrum.foundation), [@arbitrumcore](https://twitter.com/arbitrumcore?lang=en&ref=blog.arbitrum.foundation) and [@ArbitrumDevs](https://twitter.com/arbitrumcore?lang=en&ref=blog.arbitrum.foundation)) and join our [Telegram channel](https://t.me/ArbitrumFoundation?ref=blog.arbitrum.foundation) for the latest updates from the Arbitrum ecosystem. ### Introducing Frame It: An Arbitrum x Farcaster Buildathon URL: https://blog.arbitrum.foundation/introducing-frame-it-an-arbitrum-x-farcaster-buildathon/ Last updated: 2025-06-16T06:30:23.000Z We’re excited to announce that Arbitrum transaction support is now live on Farcaster! To celebrate Arbitrum’s integration on Farcaster, we’re hosting Frame It: A Buildathon for developers to create Frames, with $500,000 in retroactive rewards. Starting now you can build Frames with direct Arbitrum transaction support giving Frame builders and users direct access to one of the biggest blockchain communities, Arbitrum. Boasting a user base of over 350,000 accounts and over 59 million casts according to [farcaster.network](https://farcaster.network/?ref=blog.arbitrum.foundation), Farcaster is leading the charge of bringing social onchain. Combine this with well over 600 teams building on Arbitrum and ever growing community, we’re excited to see what builders will be able to create as a result of this integration. ### Rewards In total we’ll be allocating $500,000 total for Frame devs. $450,000 for Frame It and $50,000 reserved for IRL events such as Frameathons, meetups, workshops, etc. The first Farcaster x Arbitrum Frameathon will be held in NYC with $20,000 available in prizes for those who attend and create Frames! Details to be announced soon. As for Frame It, builders will have the opportunity to have their Frames embedded in casts by the main Arbitrum account on Warpcast. ### Eligibility For Frame builders, we encourage you to get creative and think about what will drive usage for your Frame. You could build an NFT minter, a token deployer, put your existing DeFi app into a frame, etc. The point is to get creative and build what hasn’t been built before! Eligibility details: - Frames must have an onchain component that lives on Arbitrum One (in-frame txs) - Frames that interact with Arbitrum Nova or other Arbitrum Orbit chains also may qualify - Frame tooling / infrastructure that supports Arbitrum also qualifies - Frames submissions must be by the original developer - Frames must be deployed and live, bonus points for ones that go viral Please allow for up to 4 weeks for review of your Frame to see if it is eligible for retroactive rewards. Reward amount per Frame will vary depending on the impact of the Frame both onchain and socially, alongside how much remains of the initial budget. Epoch 1 starts now and ends in 2 weeks on June 4th at 12pm EST. Each epoch will last for 2 weeks and end at 12pm EST on the last day of the epoch. Amount of epochs vary depending on the budget left within the campaign. You can submit your Frame for review [here](https://docs.google.com/forms/d/e/1FAIpQLSezzesM-CEQiafOoQkN%5Fh3S6bZjHFMnmiW%5FTq%5FuQKXU-e%5Fvvw/viewform?usp=sf%5Flink&ref=blog.arbitrum.foundation). ### Resources We can’t wait to see what you’ll create. So, here are some links that might help you during this event. - Make sure you’re following us on Farcaster [here](https://warpcast.com/arbitrum?ref=blog.arbitrum.foundation). - To get started on building with Frames, check out Farcaster’s docs [here](https://docs.farcaster.xyz/learn/what-is-farcaster/frames?ref=blog.arbitrum.foundation). - If you’ve never built on Arbitrum before, you can check out some example [tutorials](https://github.com/OffchainLabs/arbitrum-tutorials?ref=blog.arbitrum.foundation) to get started. ### FAQ - **How long will *Frame It* last?** Frame It will be roughly 9 epochs long or 18 weeks, mainly depending on how much funding is spent each week, which will be a product of how many frames are created and submitted. Epoch 1 ends June 4th, 12pm EST Epoch 2 starts June 4th 12pm EST and lasts until June 18th 12pm EST Epoch 3 starts June 18th 12pm ESt and lasts until July 2nd 12pm EST. - **How winners are elected or how will the pool prize be divided?** The Arbtitrum Foundation will be hand selecting frames that meet the criteria. If builders go above and beyond just creating the frame, like if the frame goes viral or there’s a lot of usage, then a higher price will be rewarded. **Create more, build faster, with the freedom of Arbitrum, on Farcaster.** ### ArbitrumDAO: Celebrating One Year of Community Participation 💙 URL: https://blog.arbitrum.foundation/arbitrumdao-celebrating-one-year-of-community-participation/ Last updated: 2025-06-16T06:30:28.000Z We are thrilled to join our fellow Arbinauts in **the ongoing celebrations of ArbitrumDAO’s one year completion**. The past 12 months were marked with big wins for the community. Simultaneously, Arbitrum’s technology became more secure and decentralized, supported by the efforts of ArbitrumDAO. Arbitrum’s technology development started in 2014, and since 2023, the ArbitrumDAO has guided the ownership and governance of Arbitrum One and Arbitrum Nova, allowing the community to **shape the future of Arbitrum and Ethereum.** At this point, we extend our gratitude to all the dedicated contributors to The ArbitrumDAO. The ArbitrumDAO was incepted on March 23, 2023, with active community participation kicking off in April 2023\. In recognition, we present ***The ArbitrumDAO: Celebrating The First Anniversary SBT* *NFT*** [**on**](https://twitter.com/sushicreativ?ref=blog.arbitrum.foundation)[**NiftyKit**,](http://nftkt.io/arb1styr?ref=blog.arbitrum.foundation) a comprehensive no-code NFT platform for creators and teams to mint, manage, and sell NFT digital collectibles. The NFT art is a one-of-one open edition created by [**Artist Sushi**](https://twitter.com/sushicreativ?ref=blog.arbitrum.foundation) representing the core values, collaborative nature, and history of Arbitrum, which has been in the making by many since 2014. > [**Mint here**](https://app.nftkt.io/en/mint/cluvgzhe70001elnn9ezpwvml?ref=blog.arbitrum.foundation)💙 ### Recap: A Great Year For Community-Led Governance The ArbitrumDAO was initiated to foster a more decentralized, secure, and prosperous future for the network. So much has been done in the past year that we would like to share some of the key milestones. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-tycqziisfqev20303e4peq.png) Snapshot as of April 11, 2024 đŸȘ™ **Treasury Spending** The ArbitrumDAO has allocated 750m ARB to the Arbitrum Foundation to carry out its mission statements and additionally, throughout the year it has allocated roughly 175M ARB across grant programs, DAO-led grant programs, and establishing committees like the Arbitrum Research & Development Committee (ARDC) and the Arbitrum DAO Procurement Committee (ADPC). 🛠 **Technical Advancements** The DAO has approved proposals across 3 critical areas: 1. Activating support for Account Abstraction 2. Improving the Security Council Elections process: The DAO held a round of Security Council elections in September 2023, during which 6 new members for Cohort 1 were elected. Elections for Cohort 2 [are currently ongoing.](https://www.tally.xyz/gov/arbitrum/council/security-council/election/1/round-1?ref=blog.arbitrum.foundation) 3. ArbOS Upgrades, which support notable Ethereum upgrades like Shanghai and Dencun. **💙 Meeting-up IRL** The ArbitrumDAO self-organized their very first meetup with the support of [HackHumanity](https://twitter.com/HackHumanityCo?ref=blog.arbitrum.foundation) during [Arbitrum #GovHack ](https://twitter.com/arbitrum/status/1765954512060068036?ref=blog.arbitrum.foundation)in Denver. Delegates, projects, existing and new contributors hacked on key strategic tracks that the DAO had identified. During this three-day hackathon, 23 new budding proposals emerged across tracks such as the DAO’s Business Development Strategy, Catalyzing Gaming, exploring backup Sequencers, the DAO’s Orbit Strategy, and the onboarding group. If this inspires you, **you can be part of it too!** Learn how to join the ArbitrumDAO [here](https://www.notion.so/arbitrumfoundation/Guide-Navigating-the-ArbitrumDAO-adc99590a6f14500bdd73ee38bdbdf46?ref=blog.arbitrum.foundation). And/or [apply](https://jobs.arbitrum.io/jobs?ref=blog.arbitrum.foundation) to be part of the projects building Arbitrum. > **Thank you to all ArbitrumDAO Contributors and projects that make Arbitrum special and help the Ethereum and Arbitrum ecosystem grow.** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-ercimtaenzea2evfvosc-q.png) ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-bbieihtj0d7h4pvusa-e0a.png) ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-jkcy1xrrsunf1b5fnriorw.png) ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-czawqst9yabuujeawhye6q.png) ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-muykhlix93qbiwj86fmmlq.png) ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-ew73i4axmbp_x-1lbqukhw.png) Building together 💙 đŸȘ **Key Ecosystem Updates:** - To foster Arbitrum Foundation’s commitment to transparency, the first-of-its-kind [**Transparency Report**](https://x.com/arbitrum/status/1754933172150644738?s=20&ref=blog.arbitrum.foundation)was released in February 2024\. The report was received with an overwhelmingly positive response. - **Arbitrum One** became[ the first L2 to surpass Ethereum Mainnet in 24-hour](https://x.com/arbitrum/status/1628410398058708992?s=20%E2%80%A6&ref=blog.arbitrum.foundation) transaction volume early last year — achieved again multiple times thereafter. With aTVL of 3.15 billion, Arbitrum dominates the[ L2 Market Share](https://defillama.com/chains/Rollup?ref=blog.arbitrum.foundation). - [**Arbitrum Orbit**](https://arbitrum.io/orbit?ref=blog.arbitrum.foundation), a permissionless path for launching customizable dedicated chains, is mainnet-ready. Twenty-five publicly announced Orbit chains are already in use like [Rarichain](https://rarichain.org/?ref=blog.arbitrum.foundation), [XAI](https://xai.games/?ref=blog.arbitrum.foundation), [Sanko](https://twitter.com/SankoGameCorp?ref=blog.arbitrum.foundation) and many more are to come, like [Animechain](https://twitter.com/animecoin?ref=blog.arbitrum.foundation) by [Azuki](https://twitter.com/azuki?ref=blog.arbitrum.foundation), [ApeCoin](https://twitter.com/apecoin?ref=blog.arbitrum.foundation) and[ Treasure chain](https://twitter.com/Treasure%5FDAO?ref=blog.arbitrum.foundation)! - New developments in the making that the ArbitrumDAO is yet to vote on: — [**Arbitrum Stylus**](https://arbitrum.io/stylus?ref=blog.arbitrum.foundation)**:** An upgradeintroducing a new virtual machine to run alongside the EVM. Thiswould enable coding in Rust, C, and C++ while remaining composable with smart contracts. — **BOLD:** The next-gen Fraud Proofs used for permissionless validation and more decentralization and security. - Arbitrum is the only rollup that sends surplus revenue generated by transaction fees to their respective DAO. To date, the ArbitrumDAO has [12.68K worth ](https://www.tally.xyz/gov/arbitrum/treasury?ref=blog.arbitrum.foundation)of ETH from sequencer fees as of March 23, 2024. - **Arbitrum is worldwide!** The [@arbitrum\_cn](https://twitter.com/arbitrum%5Fcn?ref=blog.arbitrum.foundation) [@arbitrum\_esp](https://twitter.com/arbitrum%5Fesp?ref=blog.arbitrum.foundation) [@arbitrum\_jpn](https://twitter.com/arbitrum%5Fjpn?ref=blog.arbitrum.foundation), [@arbitrum\_korea](https://twitter.com/Arbitrum%5Fkorea?ref=blog.arbitrum.foundation), and [@arbitrum\_intern](https://twitter.com/arbitrum%5Fintern?ref=blog.arbitrum.foundation) are now active, contributing to a more global vision, a step toward building an **Arbitrum that is** **inclusive and built by and for everyone.** - There were 4 Virtual and IRL events for the community called “**ArbitrumDay”.** You can find the amazing talks that happened there [here](https://www.youtube.com/@Arbitrum/playlists?ref=blog.arbitrum.foundation). - The Arbitrum Foundation[ **Grants Program**](https://x.com/arbitrum/status/1681693961595899909?s=20&ref=blog.arbitrum.foundation) has now moved to Phase 3 with multiple Grant Tracks! - [The Arbitrum Portal](https://portal.arbitrum.io/https://x.com/arbitrum/status/1704225859882647600?s=20&ref=blog.arbitrum.foundation) got a major update, making navigating the Arbitrum ecosystem even easier. - The **Arbitrum Ambassadors Program** started this year, and Weekly Newsletters about their achievements are shared every week! **Year 1 has been an absolute blast**, and The ArbitrumDAO is poised to be even more active entering year 2\. With many more opportunities for new and existing contributors to be involved, it will only get more exciting. > **Thank you for building a better future for all, with freedom together.** > **To mark this historical moment, grab our first SBT NFT in collaboration with** [**NiftyKit**](http://nftkt.io/arb1styr?ref=blog.arbitrum.foundation) **and made by** [**Artist Sushi**](https://twitter.com/sushicreativ?ref=blog.arbitrum.foundation)**.** > [**Mint here**](https://app.nftkt.io/en/mint/cluvgzhe70001elnn9ezpwvml?ref=blog.arbitrum.foundation)💙 ### Introducing Arbitrum Arcade URL: https://blog.arbitrum.foundation/introducing-arbitrum-arcade/ Last updated: 2025-06-16T06:30:31.000Z Introducing the Arbitrum Arcade, an Onchain Gameathon designed to showcase Web3's most innovative gaming experiences, provide exposure and prizes to up-and-coming content creators, and bring in-game achievements onchain with [Clique](https://www.clique.social/?ref=blog.arbitrum.foundation), built on top of [EAS](https://attest.sh/?ref=blog.arbitrum.foundation) (Ethereum Attestation Service). Arbitrum Arcade will kick off on March 11th through the [Arbitrum Portal](http://portal.arbitrum.io/arcade?ref=blog.arbitrum.foundation). Join us for an info session on Tuesday, March 5th, to learn more! ### Prizes and Rewards ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/0-dkwhqvllpf-y2hup.png) As a content creator, you’ll have the chance to have your content featured on the official Arbitrum X account, compete for the chance to win a custom gaming PC, and receive a share of a $200,000 grant prize pool in USD dedicated to creators! Sign up [here](https://docs.google.com/forms/d/e/1FAIpQLSekWqJTzEmJu-53YNQBXSKnKZg-SMADsrEkCTrErJpZa%5FmZzg/viewform?usp=sf%5Flink&ref=blog.arbitrum.foundation) between now and March 4th, 12pm EST to be eligible for consideration as an Arbitrum Arcade creator. As a user you’ll have the opportunity to try out 3+ games every week, use Clique to create attestations about your progress across games, and mint an NFT on [OpenSea](https://opensea.io/?ref=blog.arbitrum.foundation) at the end of the campaign signifying your participation. As a gaming team, deploy your game on Arbitrum One, Nova, or on an Orbit chain by April 15th, and you’ll have the opportunity to join in on the last week of the campaign after applying [here](https://docs.google.com/forms/d/e/1FAIpQLSfDsjGEHwIsAx5Z7eZU5IJzbWHAp1TZ1RFnKWV9zXfuIloFXA/viewform?usp=sf%5Flink&ref=blog.arbitrum.foundation). Check out all the details about joining the Arcade below! ### Arcade Lineup Each chapter will last for one week, totaling 8 weeks, featuring a lineup of over 24 games native to the Arbitrum ecosystem and pushing the boundaries of what it means to game onchain. Ai Arena, Army of Tactics, BattleFly, BattlePlan!, Bitmates, Cosmik Battle, Dininho, Forgotten Runiverse, Kaiju Cards, Knights of the Ether, Kuroro Beasts, Lost Donkeys, Mighty Action Heroes, Minters World, Monkey Empire, Pirate Nation, Realm, SankoGameCorp, Tales of Elleria, The Beacon, Treasure, Xai, Zeeverse, and ZTX are all involved in the first 7 chapters of the Arbitrum Arcade. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/0-a2kduozmsb5g56cl.png) Gaming projects not included in the first seven chapters will have the opportunity to join the fun in the last chapter, chapter eight. If you’re a gaming project and wish to be eligible for consideration in the Arcade, (1) launch your game on Arbitrum Nova or One between now and April 15th, (2) apply to be listed on the Arbitrum Portal, and (3) submit your interest in joining the Arbitrum Arcade [here](https://docs.google.com/forms/d/e/1FAIpQLSfDsjGEHwIsAx5Z7eZU5IJzbWHAp1TZ1RFnKWV9zXfuIloFXA/viewform?usp=sf%5Flink&ref=blog.arbitrum.foundation). ### Creating with Creators A big part of the Arbitrum Arcade revolves around content creation. To uplift emerging content creators and reward those who generate the most engagement for both themselves and the games, we’ve allocated $200,000 in grants to be equally distributed amongst all creators who participate. In addition to the $200,000 worth of grants, we’re also giving away 3 fully loaded PCs (up to $5,000 in value) so they’ll never have to worry about bitrate again. 😉 1st PC will go to the creator with the highest amount of referrals 2nd PC will go to the creator with the highest amount of video content produced - X, Youtube, Twitch, and Sanko TV, Kick, Tik Tok, and Instagram - MUST include hashtag #ArbitrumArcade across content on all platforms for posts to be eligible 3rd PC goes to the creator with the highest number of impressions generated through the total content produced - X, Youtube, Twitch, and Sanko TV, Kick, Tik Tok, and Instagram - MUST include hashtag #ArbitrumArcade across content on all platforms for posts to be eligible To be a creator as part of the Arbitrum Arcade, creators must have created at least 10 to 5 forms of web3 gaming video content (shorts or full-length videos) from X, Youtube, Tik Tok, or Twitch within the last 60 days (before 2/27/2024). To remain eligible for a part of the $200,000 worth of grants and PC giveaway, content creators must produce at least 1 piece of web3 gaming video content per week related to the participating games for that chapter. Winners will be decided following a manual review of content produced during the campaign. Creators can apply [here](https://docs.google.com/forms/d/1LtAw9a%5F376e%5FjJFuuOx1oHGIm1mdXcqzsQzVOHh3aB0/edit?ref=blog.arbitrum.foundation). The Arbitrum Foundation will also join the fun through weekly live streams simulcasted on [X](https://twitter.com/arbitrum?ref=blog.arbitrum.foundation) and [Youtube](https://www.youtube.com/@Arbitrum?ref=blog.arbitrum.foundation). We’re excited to have some of web3’s most popular content creators streaming with us throughout the Arcade — stay tuned for the names to be announced. ### Onchain Achievements With the kickoff of the Arbitrum Arcade, we’re introducing an onchain gaming system built by Clique on top of EAS. This system is designed for Arbitrum gamers who want to show off their onchain and offchain achievements across their favorite games within the ecosystem! EAS on Arbitrum Nova is utilized, allowing open-source contributions from anyone in the community at the infrastructure level. This will live beyond the Arbitrum Arcade, serving as a public good for the Arbitrum community and any gaming community interested in building on top of it for their own gamers. ### Preparing for Arbitrum Arcade Arbitrum Arcade officially begins on Monday, March 11th! If you’re a user who’s interested in participating, ensure you have ETH to cover gas fees on Arbitrum One and Nova. If you’re a content creator, ensure your camera is ready to go, and your mic’s gain is turned up, and apply to join the Arcade. If you’re a gaming team looking to be part of the campaign, make sure to launch between now and the end of Chapter 4. GG fam, see you March 11th in the #ArbitrumArcade. đŸ«Ą đŸ‘Ÿ ### We’re headed (back) to ETH Denver! ⛰ URL: https://blog.arbitrum.foundation/were-headed-back-to-eth-denver-ef-b8-8f/ Last updated: 2025-06-16T06:30:34.000Z ### Denver, here we come! Arbitrum is heading back to ETH Denver from Friday, February 23rd, to Sunday, March 3rd, and we’re excited to get together to explore, connect, collaborate, and have some fun along the way! Below, you will find information related to all Arbitrum events and appearances happening throughout the week. If you have any questions or are looking to connect, feel free to jump into our Discord, where we have a dedicated #ETHDenver channel set up. ### ETH Denver #BUIDLathon This year, Arbitrum is extremely excited to connect with builders on a deeper level at the official ETH Denver #BUIDLathon. #BUIDLers, we have multiple bounties for you to hack on, utilizing Arbitrum’s leading Layer 2 technology. Be sure to check out our Onchain Chess in Rust With Arbitrum Stylus workshop on February 26 from 5:10 to 5:30 PM on the Submarine Stage. Additionally, we’ll be here to support all #BUIDLers along the way at the Mentor Desk located on the #BUIDLer Floor in the #BUIDLhub and on Discord. See [HERE](https://youtu.be/5K1Ap5XC2oY?si=cqi7Otyb8fq3FQ%5FD&ref=blog.arbitrum.foundation) for a quick video and a roundup of all the bounties available to hack on! ### ETH Denver Booth Location Arbitrum will be at the Spork Castle (National Western Complex) for the main ETH Denver event! Our booth will be located in the Infrastructure and Scalability track, just before the entrance to the Atlantis Main Stage. Make sure to stop by to chat about Arbitrum and collect some swag 🙂 Check out this map for our exact location. *Booth #229* ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-d3qwvppawmmsxr45rap0lw.png) ### Arbitrum GovHack! We’re excited to present our first-ever in-person GovHack! A 3-day bootcamp for the ArbitrumDAO to come together, make real progress on proposals, ideate as a group IRL, and develop relationships with fellow DAO members. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-zg0fe3ci4lbpvhgugrd0pw.png) **February 26th & 27th (Days 1–2) : Governance Bootcamp** This Hackathon-like experience is set up to make progress on proposals, key ideas, and workstreams by giving builders live access to crucial DAO members with the high context knowledge, relationships, decision-making power, and resources needed. - Dedicated to DAO contributors - Representatives from projects on Arbitrum with domain knowledge present to consult with on your idea - Teams break out, work on proposals and initiatives, and present their findings to all other participants **February 28th (Day 3): Arbitrum Community Open Day** It is an opportunity to network with the wider Arbitrum community, which comprises community members, builders, ecosystem projects, and core developers. - **Showcase zone** existing projects & grantees share their work - Open **coworking** zone - Lunch + Prize Giving from the Hackathon (Top 3 initiatives pitch) - Networking & **match-making** for long-term success, form **alliances** in the room - **Office hours** with delegates and major protocol founders and builders Register for the event [HERE](https://lu.ma/ArbGovHack?ref=blog.arbitrum.foundation)! ### Arbitrum | A Shake Shack Takeover We’re back at Shake Shack for the second year in a row! Come join Arbitrum at Shake Shack on Friday, March 1st, for a burger (or veg option) on us. Enjoy quality conversations with the Arbitrum ecosystem. We’ll be at Shake Shack from **12 pm to 8 pm MST**, so feel free to swing by whenever it suits you. We look forward to seeing you there. **ALSO,** To celebrate this takeover, you can now mint a free generative Arbiburger on [@ProhibitionArt](https://twitter.com/ProhibitionArt?ref=blog.arbitrum.foundation), featuring creative work by [@lucastswick](https://twitter.com/lucastswick?ref=blog.arbitrum.foundation). [Mint here!](https://prohibition.art/project/arbiburgers-or-ethdenver?ref=blog.arbitrum.foundation) Register for the event [HERE!](https://lu.ma/Arbiburgers?tk=tiDRoj&ref=blog.arbitrum.foundation) ### Arbitrum Portal URL: https://blog.arbitrum.foundation/arbitrum-portal/ Last updated: 2025-06-16T06:30:43.000Z > The new Arbitrum Portal is live! [**https://portal.arbitrum.io/**](https://portal.arbitrum.io/?ref=blog.arbitrum.foundation) Welcome to the Arbitrum Portal, your gateway to the leading Layer 2 ecosystem built on top of the leading Layer 1 blockchain, Ethereum. The Arbitrum Portal provides an inclusive place for the Arbitrum and Ethereum communities to discover the vibrant app ecosystem created by developers and companies of all sizes from around the world. Explore the 600+ apps spanning verticals such as DeFi, Gaming, NFTs, Bridges, Dev Tooling, and more to truly realize the scale of the flourishing community. Here are just a few reasons why the Arbitrum Portal is essential to the ecosystem: - With sophisticated search and categorization features, apps of all scales have the opportunity to be discovered and utilized - Rotating Community Talks and the Spotlight feature highlight new and flourishing apps within the ecosystem. - Whether you’re an app, user, developer, or just a curious ecosystem member, the navigation bar quickly gets you to your destination. ### Feature walkthrough **Portal homepage** The portal homepage has been completely overhauled to showcase projects in the Arbitrum ecosystem and serve as a hub for quick access to education resources and developer tools for learning about, and building on Arbitrum. **Projects homepage** Highlighting amazing projects is essential to the new app discovery experience. In a vast sea of projects, curation provides direction for interesting use cases on Arbitrum. The Community Spotlight was introduced for this purpose and is updated weekly to keep things fresh. The Community Talks section also features insightful AMAs containing exciting information on projects building in the Arbitrum ecosystem. **Category pages** ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-9bguojtz5hqgqjo95cysyq.gif) In web3, there are numerous use-cases to explore. Breaking them down into category pages offers an easy way to navigate the different realms of crypto. Each category page further displays all related subcategories to help you find what you’re searching for more easily. **Project panels** While mechanisms for app curation and filtering are valuable, getting to know the project you’re interested in is equally important. The new portal includes dedicated side panels for each project, offering more information than before, including human-readable descriptions, demo videos, and more. Moving forward, the Arbitrum portal will listen to the community and continue refining the user experience with an objective of fostering the ecosystem, providing a unified platform for all Arbitrum-based applications. ***If you’d like to add your project to the portal, click***[ ***here***](https://docs.google.com/forms/d/e/1FAIpQLSc%5Fv8j7sc4ffE6U-lJJyLMdBoIubf7OIhGtCqvK3cGPGoLr7w/viewform?ref=blog.arbitrum.foundation)***!*** ### Arbitrum Odyssey: Reignited URL: https://blog.arbitrum.foundation/arbitrum-odyssey-reignited/ Last updated: 2025-06-16T06:30:45.000Z **Tldr:** The Arbitrum Odyssey is back, *REIGNITED!* In collaboration with [Galxe](https://galxe.com/arbitrum?ref=blog.arbitrum.foundation), you’ll go through a 7-week excursion that’ll have you exploring some of the biggest communities in the Arbitrum ecosystem and collect custom badges, created by Ratwell and frens, marking checkpoints throughout your journey. **Key Takeaways:** - Arbitrum Odyssey: Reignited starts **September 26th, 2023**. Mission details can be found [here](https://portal.arbitrum.io/odyssey?ref=blog.arbitrum.foundation). - Hop Protocol is the winning bridge protocol from bridge week! - The[**Arbitrum Portal**](https://portal.arbitrum.io/?ref=blog.arbitrum.foundation) has been completely overhauled and revamped! - There will be no airdrop, only the ability to collect badges once completing a mission. - **FAQ** is located at the bottom of the Odyssey page [here](https://portal.arbitrum.io/odyssey?ref=blog.arbitrum.foundation) ### What is the Arbitrum Odyssey: Reignited? Starting September 26th, for 7 weeks you’ll be able to explore 13 different projects through completing missions that they assign within the Arbitrum ecosystem. On top of learning more about the ecosystem and the projects within it, you’ll receive custom badges made by Ratwell and frens, members of the community, for completing these missions. A mission could be anything from utilizing a DeFi app, to completing a game! Each week you’ll find out the missions at hand. In total there are 16 badges that can be collected, 13 badges obtainable after completing each project’s mission, 1 if you participated during bridge week last year, 1 if you bridged using Hop Protocol during bridge week, and 1 final badge if you manage to collect 12 out of those 15 badges. The Arbitrum Odyssey: Reignited will begin on week 1 (see table below), starting with GMX. You can also claim your Hop badge [now](https://galxe.com/arbitrum/campaign/GC5iMU9h5P?ref=blog.arbitrum.foundation) if you used it last year during bridge week. Alongside the re-release of the Arbitrum Odyssey, the [**Arbitrum Portal**](https://portal.arbitrum.io/?ref=blog.arbitrum.foundation) has also received a huge overhaul and will be the home base for all Odyssey related details! See below for the general outline of your journey. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/0-5yzpkxo1-omi_hs1.png) ### Let’s bring it back.. The original [Arbitrum Odyssey was announced](https://medium.com/offchainlabs/the-arbitrum-odyssey-87d6e11171d5?ref=blog.arbitrum.foundation) one year ago. It was a 2-month long initiative that gave users the ability to experience different Arbitrum ecosystem projects and in return, receive exclusive NFTs designed by Ratwell & Sugoi. 14 projects were voted in by the community on Snapshot to participate. At that time Arbitrum was in its pre-Nitro era, meaning it was running on roughly 1 Ethereum worth of capacity. Bridge week was a smashing success and ended up with Hop Protocol being the most popular bridge by user count! However when the second week of the Odyssey commenced, congestion rose to levels never seen before due to a combination of the amount of users completing transactions on-chain and the complexity of the smart contracts they were interacting with. In favor of a better quality of life for the broader ecosystem, the campaign was paused until Arbitrum One went through its Nitro upgrade, giving the chain roughly 7x the capacity of Ethereum. ### So why resume the Arbitrum Odyssey? In between the pause of the Arbitrum Odyssey and now, there has been an overwhelming amount of awareness and education the campaign brought to new users. In addition, experiencing the Arbitrum ecosystem for the first time. Many had never heard of particular involved projects, and would’ve never even thought to try them out if it wasn’t for this initiative. So while it’s been close to 1 year since the pause of the Odyssey, it’s important to do right by the teams involved, and community members alike. Thus the Arbitrum Odyssey will be***reignited***. **There will be no airdrop or reward of any kind**. Badges are the only things users can collect once completing a mission. (and of course the fun along the way 😉). ### What about projects that aren’t part of the Arbitrum Odyssey? There have been a plethora of new teams and projects that have deployed on Arbitrum One since the beginning of the Odyssey. With that in mind, It’s important to stress that this will not be the last ecosystem-wide initiative that will happen, in fact, quite the contrary! Additionally, any projects running their own initiatives alongside the Arbitrum Odyssey: Reignited will have the opportunity to have their initiative featured in the [Arbitrum Odyssey portal page](https://portal.arbitrum.io/odyssey?ref=blog.arbitrum.foundation)! Please reach out to the team to have your initiative featured (Your project must be listed on the portal to be considered, submissions are subject to approval). ### What If I completed missions before the Arbitrum Odyssey paused? If you did participate in the Odyssey before it was paused and.. - Bridged over to Arbitrum One using Hop Protocol during bridge week, then you can claim your badge right now, [here](https://galxe.com/arbitrum/campaign/GC5iMU9h5P?ref=blog.arbitrum.foundation). - If you completed a GMX mission during their week before the pause then you’ll have to complete the new mission when it’s released next week, September 26th, 2023. ### View your badges on OpenSea Once you’ve completed a mission and claimed your badge, you can view them on your [OpenSea](https://opensea.io/?ref=blog.arbitrum.foundation) profile. Here you’ll be able to view and collect all of the badges you acquire throughout your journey on the Arbitrum Odyssey: Reignited! ### WHERE DO I GET STARTED?? For information on the current status of the Arbitrum Odyssey, make sure to visit the Arbitrum Odyssey page on the new and improved Arbitrum Portal! Information on the missions each week will be updated once the week commences. So make sure to stay tuned on Twitter, Discord, and the [Arbitrum Odyssey page](https://portal.arbitrum.io/odyssey?ref=blog.arbitrum.foundation) on the Arbitrum Portal for all the latest updates. See you September 26th frens, your journey awaits. ### Security Council Elections 101 URL: https://blog.arbitrum.foundation/security-council-elections-101/ Last updated: 2025-06-16T06:30:49.000Z ***Tldr:*** - *The Security Council is a vital part of the Arbitrum ecosystem trusted to respond to critical emergencies.* - *Security Council Elections are held every 6 months, and allow the DAO to elect new Security Council members.* - *Actively participating in Security Council Elections is one of the most important responsibilities of the Arbitrum DAO.* On September 15 2023, the first Arbitrum DAO Security Council Election will take place! Here, we’ll give you the overview of everything you need to know: what the Security Council is, how the Security Council elections work, and how you can participate. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/0-iwyaghp8u0qiq0ff.png) ### Background The DAO-governed Arbitrum chains — like all software — sometimes needs to be upgraded. Arbitrum’s governance system provides two ways for the upgrades to take place: via a DAO proposal, or via the Security Council. DAO proposals can be submitted by anyone, are transparent, and are deliberately designed to take weeks to finalize. This time allows Arbitrum delegates to vote on the proposal, and ensures that, if the proposal passes, Arbitrum users will still have an opportunity to “opt out” of it by withdrawing their funds before it takes effect. Some upgrades, however, ***need*** to happen quickly — namely, upgrades that fix a critical bug discovered in the system. For this class of upgrades, quick effectuation is necessary to ensure no attacker can exploit the vulnerability once it is public. These fast-upgrades can be carried out by the Security Council. The Security Council consists of 12 members, any 9 of whose signature is required to authorize an emergency upgrade. The initial Security Council members (i.e., the members prior to the first election on 9/15/23) can be seen [here](https://docs.arbitrum.foundation/foundational-documents/transparency-report-initial-foundation-setup?ref=blog.arbitrum.foundation#3-on-chain-dao-governance). As of this writing, all upgrades have been carried out via the DAO proposal path; no emergency upgrades have been necessary. However, given the known-unknown risk of undiscovered bugs, having an emergency upgrade contingency plan remains vital. The Security Council is trusted to only ever use it’s ability to recover from emergencies; however, technically speaking, the Security Council could upgrade the system arbitrarily. Thus, it is important that the DAO places great importance and deliberation in electing reputable and trustworthy individuals and/or entities to the Security Council. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/1-oq_ng1vnitb4mu0sh1qy_a.png) ### Security Council Election: Overview Security Council elections are a way for the DAO to periodically elect new members (and/or explicitly re-elect members) of the Security Council, ensuring that members remained aligned with the values and best interests of the DAO. In brief: the 12 members of the Security Council are split into two groups of six, called “cohorts.” Every 6 months, the six seats in one of the cohorts are all up for election, with the target cohort alternating each election cycle. During an election, any party can submit themselves as a candidate in the election. During the election process, the DAO votes on candidates such that ultimately the top 6 are chosen; after a brief grace period, these 6 candidates replace the 6 candidates in the current cohort, finishing the election. ### Security Council Election: In Detail The following is a more detailed overview of the different phases of a Security Council Election: **Phase 1: Nominee Selection (first voting phase): 7 Days** During this phase, any party can submit themselves to become a “contender” so long a they are not already a member of the other cohort (the cohort not currently up for election). Also during this phase, delegates can cast votes for contenders. Delegates can split their votes across as many contenders as they please; i.e., if Steve has a total of 1000 delegated votes, he can cast 300 votes for Alice and 700 votes for Bob. Any contender that receives votes representing 0.2% of all voteable tokens advances to the next phase. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/0-owwcvp67lr05hiir.png) **Phase 2: Compliance Check: 14 Days** During this phase, as dictated in the Constitution, contenders that pass phase 1 must undergo a compliance check undertaken by the Arbitrum Foundation to ensure they comply with the legal requirements, service agreements, and additional rules dictated by the Constitution. Contenders can start the compliance process by reaching out to “scelection@arbitrum.foundation”. Note that for a contender to be excluded at this phase, the Foundation must take a public, on-chain action. All contenders that are not excluded during the compliance check are considered “nominees,” and advance to the next phase. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/0-lyuqybpinmea9bak.png) **Phase 3: Member Selection (second voting phase) 21 Days total** During this phase, delegates voting power is “reset” from phase 1; delegates vote on nominees until 6 are selected as members of the new cohort. The member selection phase is comprised of two sub-phases: full-weight voting, and decreasing weight voting. **3a. Full Weight Voting (7 Days)** During this sub-phase, delegates vote with the full weight of the votes delegated to them. **3b. Decreasing Weight Voting (14 Days)** During this sub-phase, delegates voting power decreases linearly; i.e., at the beginning of the sub phase they can vote with 100% of their voting weight, and by the end their votes have 0 weight. ![](https://storage.ghost.io/c/d4/cc/d4cc8040-691e-4dd2-8282-0c08d45fc5a8/content/images/2025/06/0-wwb12rprcfeuegwg.png) As with phase 1, delegates can split their votes across multiple candidates. For example: Steve — who, recall, used all 1000 of his votes in phase 1, now, during the full weight voting phase, has 1000 votes once again. Say he casts 600 votes for Bob and 100 for Christine, leaving him with 300 votes left. Then, he waits until he is 7 days into the decreasing weight voting phase before voting again. At this point he casts all of his votes for Daniel; since he is 50% of the way through this phase, his voting power is decreased by 50%, so Daniel gets 150 votes, and Steve has no more votes to cast. At the end of the Member selection phase, the six nominees with the most votes are the winners, and are set to become members of the Security Council. **Phase 4: Grace Period (13 Days)** This period is simply a delay period after the new members have been officially elected and before they actually become members of the Security Council. This delay period allows Arbitrum users to withdraw their funds if they so chose before the new council members are put into place (as per the constitution), and is also required so that the election results can propagate to the Security Council contracts across all relevant chains. ### How To Participate The election process is carried on via on-chain smart contracts which can be accessed through the Tally interface [here](https://www.tally.xyz/gov/arbitrum?ref=blog.arbitrum.foundation); discussion around elections is encouraged on the [governance forums](https://forum.arbitrum.foundation/?ref=blog.arbitrum.foundation). Here are ways to get involved: **Potential Contenders** If you’re interested in putting yourself up for vote to become a member of the Security Council, you are encouraged to carefully review the compliance requirements, risks, and responsibilities involved; for more info, see [here](https://docs.arbitrum.foundation/dao-constitution?ref=blog.arbitrum.foundation#section-3-the-security-council). If you think you’re suited for the job, you can campaign for yourself and engage with the community by posting on the [governance forum](https://forum.arbitrum.foundation/?ref=blog.arbitrum.foundation). **Delegates** Delegates are encouraged to vote! Recall that there are two phases during which a delegate can vote; selecting nominees and picking the top six among selected nominees (i.e., phases 1 and 3 above). Delegates are encouraged to carefully consider the decreasing weight mechanism (3b above) so they can optimize their strategy accordingly. **Community Members** All members of the Arbitrum community — whether or not they have delegate votes — are encouraged to participate in elections via public platforms like the [governance forum](https://forum.arbitrum.foundation/?ref=blog.arbitrum.foundation) and weigh in on who they think would be strong candidates for security council membership. ### Introducing The Arbitrum Foundation Grants: Phase 1 URL: https://blog.arbitrum.foundation/introducing-the-arbitrum-foundation-grants-phase-1/ Last updated: 2025-06-16T06:30:50.000Z Today, we’re excited to share the Arbitrum Foundation’s first ever [grant program](https://arbitrumfoundation.notion.site/53ad99f665d946adb58bf92e82438fd5?v=efcd2d955fa54bcfaabaa46812732206&ref=blog.arbitrum.foundation). This program is an important step in line with the Foundation’s mission set out by the Foundation’s[ Bylaws](https://drive.google.com/file/d/1TOLXm%5FNOUwxUaYLqrORubt8a47GvlmS-/view?ref=blog.arbitrum.foundation) which codifies that the Foundation is responsible for “*fostering ecosystem growth through grants to align with partner projects and educational initiatives with in-person and online events*”. [https://arbitrum.foundation/grants](https://arbitrum.foundation/grants?ref=blog.arbitrum.foundation) The Arbitrum Foundation’s Grant Program outlines the framework by which the Arbitrum Foundation, in support of the Arbitrum DAO, will allocate grants in line with the directives provided in the mission statement and the Constitutional documents. This program is called **Foundation Grants** to clarify that the Arbitrum Foundation runs this program. It should not be confused with any other grant programs authorized by the Arbitrum[ DAO](https://forum.arbitrum.foundation/?ref=blog.arbitrum.foundation). It is important to distinguish that the Foundation Grants Program is NOT designed to replace any DAO-driven grants program. This program is run through the Foundation to satisfy the requirements set out in the Foundation’s mission statement towards achieving specific objectives and areas of opportunity identified by the Foundation. Foundation’s Grants is focused on ecosystem growth and issuing grants towards areas where increased development will potentially see a proportionally greater return to the Arbitrum ecosystem. All grants issued through this program will serve to improve adoption, create stronger technical structures, and build amazing sustainable communities. These grants will be milestone and KPI based, which will be established in collaboration with each applicant. The Foundation Grant Program will operate in distinct phases,each designed to attract applications from specific areas within the Arbitrum ecosystem. The initial phase places the spotlight on decentralized applications and infrastructure for Arbitrum Nova and Arbitrum One. You can read more on categories [here](https://arbitrumfoundation.notion.site/Current-Phase-Categories-a0108619966148b4a9189ecda1a59ef3?ref=blog.arbitrum.foundation). If your project does not meet the criteria for the current phase, you are encouraged to submit a proposal to the ArbitrumDAO via the[ proposal process outlined in the constitution](https://docs.arbitrum.foundation/dao-constitution?ref=blog.arbitrum.foundation#section-2-dao-proposals-and-voting-procedures) or to revisit this page at a later time as new phases are announced. You can also reach out to grants@arbitrum.foundation. Applications that are chosen to receive a grant from the Foundation will be given the opportunity to be showcased. The Foundation plans to include major activities of this program under the transparency report as stated in [AIP 1.1](https://forum.arbitrum.foundation/t/proposal-aip-1-1-lockup-budget-transparency/13360?ref=blog.arbitrum.foundation). The Foundation Grants Program is an ongoing initiative, with a rolling grant acceptance window allowing projects with grant requests to submit them as needed. Phases do not have defined “end dates” from the outset, but can be expected to last for roughly three months or until the Arbitrum Foundation believes the objectives for that phase have been achieved. There will be grant moratorium periods during the year where additional applications will be frozen. These will be announced and disclosed through this [Notion page.](https://arbitrumfoundation.notion.site/53ad99f665d946adb58bf92e82438fd5?v=efcd2d955fa54bcfaabaa46812732206&ref=blog.arbitrum.foundation) We are excited to embark on this journey of supporting projects within the Arbitrum ecosystem through the Foundation Grants Program. Together, we can foster growth, drive adoption, and build a thriving community, working hand in hand to contribute and shape the future of the Arbitrum ecosystem. If you have any questions, check our [FAQs](https://arbitrumfoundation.notion.site/Frequently-Asked-Questions-136dbb6a76f9458db82419da55fa69c2?ref=blog.arbitrum.foundation) or reach out to grants@arbitrum.foundation ### Introducing the Arbitrum Ambassador Program: Phase 1 URL: https://blog.arbitrum.foundation/introducing-the-arbitrum-ambassador-program-phase-1/ Last updated: 2025-06-16T06:30:50.000Z *Tldr; Students or university-based blockchain clubs that are interested in contributing to the Arbitrum community and representing Arbitrum on their local campus can now apply to join Phase 1 of the Arbitrum Ambassador Program* [*here*](http://arbitrum.foundation/ambassador?ref=blog.arbitrum.foundation)*. Community members and developers should stay tuned for the next launch phase.* ### What are the different Phases? The timeline for each Phase of the Arbitrum Ambassador Program is as follows: **Phase 1** — University-based Clubs and Students: *Today* **Phase 2** — Individuals (Community + Technical): *Q3 2023* Phase 1 of the Arbitrum Ambassador Program has officially launched. Accepted applicants will be entered into the University Fleet, a collaborative group within the Ambassador Program focused on building, learning, and educating. As an Ambassador, you’ll grow professionally by creating content, hosting in-person events funded by the Arbitrum Foundation, and more. Other things you’ll be able to do as an ambassador include: - Propose initiatives for funding by the Foundation - Represent Arbitrum as an official ambassador on your university campus, and beyond - Make valuable contributions to the broader Arbitrum ecosystem - Organize and host an Arbitrum satellite event in your region Phase 2 will provide a framework for community members and developers who are eager to represent the Arbitrum ecosystem but are not affiliated with a university. Ambassadors will have an opportunity to organize and host regional in-person events, develop content, build ecosystem tools, and learn more about Arbitrum technology by being involved in the Ambassador Program. Accepted applicants will be assigned to the Community Fleet or Technical Fleet, which are collaborative groups within the Ambassador Program focused on their respective niches. ### What are the benefits of being an Arbitrum Ambassador? By becoming an Arbitrum Ambassador you gain access to everything mentioned above, including the ability to: - Represent Arbitrum in your local community as an official ambassador - Work side-by-side with the ecosystem’s biggest protocols - Network with others and build your own professional portfolio - Learn about scaling and Layer 2 technologies from industry leaders - Have an impact on research related to tech and community ideas We aim to maintain flexibility and relevance in ambassador participation. Some ambassadors may choose to contribute solely online, while others may focus on hosting in-person events in their local communities. We acknowledge that each individual has their own preferred way of showing support, so eligibility and rewards will be assessed on a case-by-case basis, tailored to each ambassador’s efforts. If you’re a community member or developer looking to get involved, stay tuned for more details on Phase 2 of the Ambassador Program. ### Why an Ambassador Program? The Arbitrum community has been dedicated to scaling Ethereum, its dApps, and its values. Arbitrum has emerged as the most adopted Ethereum-based scaling solution because of all the amazing builders, users, and enthusiasts who have believed in it since day 1\. So now, with the recent formation of the Arbitrum Foundation, we can set our sights on the next step in scaling Arbitrum globally with the launch of the Arbitrum Ambassador Program. The Arbitrum Ambassador Program is being formed to enable community members to represent Arbitrum in their regions. The program will strengthen the connection between the broader community and the Arbitrum Foundation by empowering individuals to make a positive impact in their local communities. This will allow you to make a difference in one of the biggest ecosystems in Web3. We’re extremely excited to enter this next chapter of community contribution to Arbitrum and we look forward to helping expand the Arbitrum community to the next million users! ### USDC to Come Natively to Arbitrum URL: https://blog.arbitrum.foundation/usdc-to-come-natively-to-arbitrum/ Last updated: 2025-06-16T06:30:51.000Z [**Circle**](https://www.circle.com/en/usdc?ref=blog.arbitrum.foundation) **is launching USDC natively on Arbitrum on June 8, 2023**! Keep reading to learn more about this launch and how to migrate liquidity from “bridged USDC” to native USDC. ### Native to Arbitrum USDC issued by Circle will be native to Arbitrum. This will be the official version of USDC that is recognized within the Arbitrum ecosystem, and will ultimately replace the currently circulating bridged version of USDC that comes from Ethereum. ### Benefits of Native USDC - Fully reserved and always redeemable 1:1 for US dollars - Enables institutional on/off-ramps via Circle and other partners - Upcoming support by [CCTP](https://developers.circle.com/stablecoin/docs?ref=blog.arbitrum.foundation) to eliminate bridge withdrawal delays - Upgradeable smart contract for future enhancements by Circle ### What You Need to Know Ahead of the launch of native USDC on June 8th, Arbitrum will be renaming the Ethereum-bridged version of USDC on block explorers as “USDC.e”. There will also be outreach to ecosystem apps to make the same change in their app UI and documentation. ### Bridged USDC from Ethereum - Token Name: **Bridged USDC** - Token Symbol: **USDC.e** - Token Address: [**0xff970a61a04b1ca14834a43f5de4533ebddb5cc8**](https://arbiscan.io/token/0xff970a61a04b1ca14834a43f5de4533ebddb5cc8?ref=blog.arbitrum.foundation) ### Native USDC issued by Circle - Token Name: **USD Coin** - Token Symbol: **USDC** - Token Address: [**0xaf88d065e77c8cC2239327C5EDb3A432268e5831**](https://arbiscan.io/token/0xaf88d065e77c8cC2239327C5EDb3A432268e5831?ref=blog.arbitrum.foundation) ### Liquidity Migration Arbitrum will be working with ecosystem apps to provide a smooth transition of liquidity from bridged USDC to native USDC over time. There will be no immediate changes to the Arbitrum Bridge, and it will continue to operate normally for bridging USDC to and from Ethereum. ### Future Plans Circle expects to bring Cross-Chain Transfer Protocol (#CCTP) to Arbitrum after the launch of native USDC. Upon integration into the Arbitrum Bridge, this will enable USDC to move natively to-and-from Ethereum (and other supported chains) in minutes — no more withdrawal delays. ### Stay Tuned for June 8th! We’re very excited about what native USDC means for the Arbitrum ecosystem! Please reach out on the [Arbitrum Discord](https://discord.gg/uBfTvvjBG4?ref=blog.arbitrum.foundation) and [Circle Discord](https://discord.com/invite/buildoncircle?ref=blog.arbitrum.foundation) if you have any questions. Stay tuned! ### ARBITRUM: THE NEXT PHASE OF DECENTRALIZATION URL: https://blog.arbitrum.foundation/arbitrum-the-next-phase-of-decentralization/ Last updated: 2025-06-16T06:30:52.000Z *Tldr: Nah you should really read this one. OK, OK fine, here are the highlights, but really you should read the post: (1) Today marks the launch of The Arbitrum Foundation and DAO Governance for the Arbitrum One and Arbitrum Nova networks. Arbitrum has become the first EVM rollup technology to achieve the second stage of decentralization. (2) The Arbitrum token will put governance power in the hands of the DAO. 12.75% of the $ARB token supply will be airdropped on March 23\. (3) Today marks the launch of Arbitrum Orbit making it permissionless and easier than ever for developers to launch their own customized Layer 3 chains using Arbitrum’s best-in-class technology stack.* *DON’T GET SCAMMED; Airdrop hasn’t begun yet, read below for more details and only follow trusted links. 💙* ### Wen Token? Now! (Well, OK, technically next Thursday). After years of development and nearly 18 months running on mainnet, The Arbitrum Foundation is extremely excited to announce the launch of DAO governance for the Arbitrum One and Arbitrum Nova networks, a massive leap forward in the decentralization of the two networks. The future of Arbitrum belongs to the DAO community, and this post will give more details about why today’s decentralization milestone is so important, and the role of the $ARB token for enabling community-driven DAO governance. ### W̶e̶n̶ ̶T̶o̶k̶e̶n̶?̶ Why Token? The guiding mission when building Arbitrum has always been to securely scale Ethereum, and this security-first mindset is the guiding force behind decentralizing the chain as security and decentralization are closely intertwined. Building a secure and decentralized L2 requires removing any centralized points of chain control so that the chain can operate trustlessly. *So how does one remove centralized control?* The first prerequisite is to build the core technology that allows the chain to operate without any centralized actors, and key to this are the fraud proofs that empower Ethereum to enforce the chain’s correctness. And indeed, Arbitrum fraud proofs have been live from the earliest days of its first testnet launch, and they’re critical to both security and decentralization. *So can you just throw out the keys?* Not so fast. While a fully built out rollup can in theory operate without any centralized intervention, an important question arises around upgrading the rollup. If you throw out the keys, it becomes impossible to upgrade, but upgrading is important to introduce improved technology as it becomes available. And indeed, late last summer, Arbitrum was upgraded to the Nitro stack which included improved compression, lower fees, and massively increased throughput. Upgradeability is also critical in order to patch the software in the event of a discovered vulnerability. So we can’t give up upgradeability but we want to remove central points of control. *But then who controls upgradeability?* The Arbitrum DAO does, and the $ARB token is essential for distributing this power to the community. And that’s why a token is necessary for securely scaling Ethereum. ### W̶e̶n̶ ̶T̶o̶k̶e̶n̶?̶ ̶W̶h̶y̶ ̶T̶o̶k̶e̶n̶?̶ Why Now? Today’s launch is the logical next step in Arbitrum’s decentralization roadmap. In August, Arbitrum One was upgraded to Nitro, and just a few months ago, it [was announced](https://offchain.medium.com/arbitrum-decentralization-update-39f093768c42?ref=blog.arbitrum.foundation) that 10 independent institutional validators had signed up to validate Arbitrum One. With the tech mature and validation expanded, the next step toward decentralization is today’s launch: giving The Arbitrum Foundation and DAO ownership of the chain and the responsibility to foster and grow the Arbitrum ecosystem. Today’s launch isn’t only a milestone for Arbitrum; it’s a historic day for Ethereum scaling more broadly. The Ethereum community has been working for years towards building a secure and decentralized L2, and late last year, Vitalik Buterin proposed a [3 stage schema](https://ethereum-magicians.org/t/proposed-milestones-for-rollups-taking-off-training-wheels/11571?ref=blog.arbitrum.foundation) for classifying the maturity of rollups. With today’s announcement Arbitrum has become the first EVM rollup ever to achieve the second of the three stages. And that’s a reason to celebrate — but not yet. Finish reading the post first. ### Self-executing DAO Governance The Arbitrum Constitution specifies the governance process and how proposals are presented and voted on. Arbitrum’s DAO governance is self-executing, meaning that the DAO’s votes about on-chain actions will directly have the power to effect and execute its on-chain decisions, without relying on an intermediary to carry out those decisions. Self-executing governance is a critical milestone for decentralization, and Arbitrum is leading the way as the first L2 to launch self-executing governance. To make sure that proposals are carefully deliberated, voted on, and that users have time to react to any upcoming changes, the voting process requires a minimum of 21–37 days (depending on the nature of the proposal) to pass before a proposal can be executed. While DAO proposals do not have the ability to quickly push changes to the protocol, in emergency situations (e.g. to patch a vulnerability) it can be necessary to swiftly push an upgrade. Moreover, depending on the nature of the emergency, it will generally be ill-advised to publish the details of the situation in the governance forum before it has been rectified. For these reasons, The Arbitrum Foundation also established the Arbitrum Security Council, a 12-member multisig of highly regarded community representatives designed to ensure the security of the chains and be able to act quickly in the event of a security vulnerability. In case of emergency, the Arbitrum Security Council will be able to act swiftly, but this will require participation from 9 of the 12 members. The Arbitrum DAO will be the ultimate governing body over the Arbitrum Security Council, with elections for the Council being held twice annually. The DAO also has the power to retire the Security Council should it at some point decide that it is no longer required to protect the chain. ### Arbitrum Orbit and Community Governed Licensing The Arbitrum technology is the most advanced rollup stack to date, and an exciting facet of today’s announcement is Arbitrum Orbit, which will allow developers to easily and permissionlessly launch their own Layer 3 (L3) blockchain in the Arbitrum ecosystem. Developers launching L3s on Arbitrum One and Nova are automatically granted a free and perpetual license allowing them to use, modify and customize Arbitrum’s best-in-class technology for their L3 chains. Arbitrum Orbit L3 chains will also support the upcoming release of [Arbitrum Stylus](https://offchain.medium.com/hello-stylus-6b18fecc3a22?ref=blog.arbitrum.foundation), which will allow developers to use the C, C++, and Rust programming languages for their chains, in addition to Solidity and other EVM languages. The Arbitrum DAO will have the ability to authorize additional Layer 2 chains on Ethereum, irrespective of whether the chain is governed by $ARB, ensuring that the community is in full control over the future of Arbitrum and its technology. For developers that want to use the Arbitrum stack to launch L2 chains directly on Ethereum (as opposed to L3s), they can submit a DAO proposal and the DAO has full discretion to grant these licenses. In this way, the community has significant control over the future of not only the Arbitrum One and Nova chains but of the underlying technology itself. ### $ARB Airdrop: Users We’ve talked a lot about what governance is and why it’s important, but equally important is how that responsibility gets distributed to the community. The Arbitrum token is majority community owned (\~56%). Of that community allocation, 12.75% will be distributed in the Arbitrum Airdrop next Thursday, March 23, based upon data taken on a snapshot on February 6, 2023. Determining the eligibility criteria for receipt of the airdrop was a complex process. There are hundreds of thousands of weekly users of the Arbitrum platform, and the protocol has been operational for nearly 18 months. There’s a sensitive balance that needs to be struck between (1) making sure to include a wide array of Arbitrum users, (2) ensuring that individual airdrop recipients receive a meaningful distribution, and (3) reserving tokens for future DAO grants. Over the course of the past many months, The Arbitrum Foundation and Offchain Labs worked closely with Nansen to design eligibility criteria that would fairly distribute the $ARB tokens to a large cross-section of real Arbitrum users. Together, we developed a point system that took into account a variety of metrics of network usage, but also deducted points from users who engaged in sybil-linked usage patterns. Points were awarded for usage on both Arbitrum One and Arbitrum Nova and early users of Arbitrum One (before Nitro) were given more points for early usage. Any user with three or more points is eligible for the airdrop. For the sake of transparency, we are publishing not only the full list of airdrop recipients but also the underlying criteria and data set so that users can themselves verify the fairness and correctness of the process. You can find that data [here](https://docs.arbitrum.foundation/airdrop-eligibility-distribution?ref=blog.arbitrum.foundation). ### $ARB Airdrop: DAOs While we did our absolute best to include a wide variety of genuine Arbitrum users in the airdrop, invariably some recent or infrequent users were not included in the user airdrop (and indeed discerning between a new user and an airdrop farmer was generally very difficult). To capture these users, we included a second mechanism as well by which we granted tokens to the community: the DAO airdrop. The ultimate goal is the localization of community governance. While The Arbitrum Foundation can try its best to properly distribute governance, it is impractical to optimize within every subcommunity on Arbitrum (there are many!). Accordingly, only Arbitrum projects with DAO treasuries were eligible. While there are many amazing teams and companies contributing to the ecosystem, the goal here is not to reward projects for their contributions, but to really allow all sub-communities within the Arbitrum ecosystem to have a voice. In putting together this criteria we worked with Nansen and analyzed on-chain data to determine how many tokens each DAO community was granted. In doing so we took into account a variety of qualitative and quantitative metrics including when the protocol launched, whether it was native or multichain, how much TVL, activity, transaction volume, value of transactions it had, as well as the consistency of maintaining those metrics. The goal of using a broad variety of criteria was recognizing that Arbitrum is home to a diversity of projects that have different KPIs and user interactions. Each protocol knows its community best, and it will be up to the respective DAOs to determine how to distribute governance within their community. It is our hope and intention that by distributing tokens to Arbitrum DAOs, governance power will ultimately be shared with a broader variety of users than just those eligible for the user airdrop. For newer projects or projects that don’t yet have DAOs or community governance, have no fear. In the coming weeks, The Arbitrum Foundation will announce the details of its grant programs that Arbitrum projects will be able to apply for. One exception made in the DAO airdrop was including the [Protocol Guild](https://protocol-guild.readthedocs.io/en/latest/index.html?ref=blog.arbitrum.foundation), a collective of Ethereum core developers and contributors. Although the Guild is not an Arbitrum project, in consideration of Arbitrum’s fundamental connection to Ethereum and the benefit that Arbitrum and its users get from the tireless work of these contributors, it seemed only appropriate to include them as their voices will be most welcome in Arbitrum governance. ### Eligibility, Claiming, and Delegation Users can visit [https://arbitrum.foundation](https://arbitrum.foundation/?ref=blog.arbitrum.foundation) and follow the prompts to check airdrop eligibility details. Users will not be able to claim their tokens, however, for one more week (March 23). The reason for the interval between the announcement and claiming dates is that we wanted users to have the option to delegate their tokens during the claiming process, but we also wanted there to be a fair and open process in which a diverse set of community members can nominate themselves to be delegates. In order to satisfy both of these constraints, we’ve added the one week delay, and we encourage those to apply to be a delegate. Every user can of course vote for themselves, and there’s no need to delegate to a third party. But for those users who want to participate in governance but don’t want to actively vote on-chain, delegation is an elegant way in which they can passively have their voices represented in Arbitrum governance. ### Distribution The majority of the Arbitrum token is designated for the community, and the upcoming airdrop will immediately distribute 12.75% to the community. The Arbitrum Foundation and DAO will be tasked with distributing the additional community tokens over time. To accelerate this process and make sure that the community remains well represented in the early days, Offchain Labs team members have been instructed not to vote with their tokens, but they are encouraged to delegate them to community members, thereby putting more power in community delegates from the very beginning. Additionally, while the user and DAO airdrops will be available in one week, all investor and team tokens are subject to 4 year lockups, with the first unlocks happening in one year and then monthly unlocks for the remaining three years. ### LFG Today’s launch is an important step to decentralize the Arbitrum networks and put the community in control of Arbitrum’s ecosystem and technology. And if you’re a community member, there are now more ways than ever to get involved. You can vote your own tokens, nominate yourself as a delegate, run in the Security Council election, or apply for a grant to contribute to the Arbitrum technology or ecosystem. If you’re a developer, you can build an Arbitrum dapp, and now, with the launch of Arbitrum Orbit, you can even permissionlessly build a custom L3 chain using the Arbitrum stack. The opportunities in the Arbitrum ecosystem are endless. But the critical ingredient is you, the community. So LFG and build Arbitrum together. We got this 💙🧡