> ## Content Index > Fetch the complete content index at: https://blog.arbitrum.foundation/llms.txt > Use this file to discover other available public pages before exploring further. # 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/ - Published: 2026-07-01T10:27:59.000Z - Updated: 2026-07-16T09:16:16.000Z - Author: Arbitrum Foundation - Tags: Builder Newsletter 💡 ****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. ➡️ [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. ➡️ [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. ➡️ [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. ➡️ [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. ➡️ [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. ➡️ [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. ➡️ [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 adapt🧵👇 [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. ➡️ [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. ➡️ [Check out the announcement](https://x.com/RAILGUN%5FProject/status/2069427686489854271?s=20&ref=blog.arbitrum.foundation) --- ## 🗓️ 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. ➡️ [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! ➡️ [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 🇩🇪 > > 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) 👇 🧵[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) --- ## 🧵 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. ➡️ [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. ➡️ [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. ➡️ [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.