Builder Newsletter

• Builder Newsletter

Builder's Block #022: Arbitrum’s Mid-Year Recap & New Stylus Hardhat Plugin

💡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

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Builder's Block #021: Robinhood Chain Mainnet Live on Arbitrum & Founder House London Winners

💡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 The launch of Robinhood Chain enables a more

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Builder's Block #020: Final Call for Founder House London & Why Enterprises Choose Arbitrum

💡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

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Builder's Block #019: Arbitrum's Product Priorities & Meet the Sponsors Backing London Founder House

💡What's Important This Week 🤖 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

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Builder's Block #018: What's Next for AI & Open House Buildathon Schedule

💡What's Important This Week 📋 Schedule and FAQs about the Open House Online Buildathon 🛠️ Sub-second proof verification with Syndicate and Stylus 🤖 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 &

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Builder's Block #017: $415k in Prizes at Open House London - Apply Now

💡What's Important This Week 💸 $415k in Prizes Up for Grabs at Open House London - Register Now 🤖 How to Ship x402 Agentic Payments on AWS & Arbitrum 🛠️ B3OS - The Onchain Engine for Agentic AI, Integrated with ZeroDev on Arbitrum 📣 Announcements Key updates from the Arbitrum ecosystem and Foundation. $415,

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Builder's Block #016: Open House London Dates Locked & First Cohort of Mentorship Program

💡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 🤖 Winners for the ArbiLink Agentic Bounty have been announced 📣 Announcements

• Builder Newsletter

Builder's Block #015: Apply for Open House London & New Wallet Standards on Arbitrum

💡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

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Builder's Block #014: ArbiLink Agentic Bounty is Live & Mentorship Program Partners Announced

💡What's Important This Week 🤝 Partners announced for the Arbitrum Mentorship Program 🤖 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

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Builder's Block #013: $340K Awarded at NYC Open House & Mentorship Applications Open until April 7th

💡What's Important This Week 🏆 $340K Awarded at NYC Open House 📚 Applications for Mentorship now open to builders 🖋️ 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 Receive hands-on

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Builder's Block #012: Arbitrum NYC Open House Winners Announced & Mentorship Program Applications Now Open

💡What's Important This Week 💸 Up to $100K at Arbitrum Mentorship Program 🤖 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 Eight-week, equity-free program with structured

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Builder's Block #011: Robinhood Chain Launches Testnet & Commits $1M to Builders

💡What's Important This Week 🍀 Robinhood Testnet 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 Developers can now build on a financial-

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Builder's Block #010: OpenHouse NYC Kicks off Feb 5th - Get to Know our Sponsors

💡What's Important This Week 💸 OpenHouse NYC Sponsors Announced 🤖 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 Build. Ship. Scale. We're about to kick off our

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Builder's Block #009 - Open House 2026 Locations & ArbOS Dia Upgrade

💡What's Important This Week 🧑‍💻 Open 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

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Builder's Block #008 - Porting Solana to Arbitrum, Prysm Post-Mortem & WASM performance

💡What's Important This Week 🔹 Prysm Post-Mortem on Fusaka ⚙️ Why WASM is the answer to execution models 💲 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.

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Builder's Block #007 - Solidity's Rebuild, Fusaka Upgrade & ERC-8004

💡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 Fusaka (Fulu + Osaka) combines PeerDAS