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 Mentorship from

NYC Founder House Concludes With $340K in Awards to Winning Teams

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

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 sessions, mentors

Structuring Multi-Contract Stylus Projects Without Pain

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

Open House NYC Buildathon Concludes: Meet The Winning Teams

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

Introducing the Arbitrum Mentorship Program: Access, Capital, and Strategic Support

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

AI and Stylus: The Builder's New Toolkit

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

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-grade

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

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

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. Details the

Arbitrum in 2025: The Year of Everywhere

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