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

📣 Announcements

Key updates from the Arbitrum ecosystem and Foundation.

Robinhood Chain Testnet now live

Developers can now build on a financial-grade Ethereum Layer 2 built on Arbitrum — designed to support tokenized real-world and digital assets.
➡️ Start building now

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.
➡️ Apply for Open House NYC

ERC-8004 is now enabled on Arbitrum

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.
➡️ Build with ERC-8004 on Arbitrum

Dive into the Dynamic Pricing roadmap

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.
➡️ Discover the roadmap

📚 Learn & Build

New learning drops and hands-on resources from across the Arbitrum ecosystem.

Build end-to-end Arbitrum dApps with ClaudeAI skill

Finally, an AI that actually understands the Arbitrum stack!
Go from Idea → working code → deployed.
➡️ Watch the 8 minute guide

🔦 Ecosystem Highlights

Fresh launches and standout threads from around the Arbitrum ecosystem.

Ecosystem Spotlight: January Highlights

➡️ Dive into the highlights

Hyungji, one of Korea's largest fashion retail groups, is bringing stablecoin payments to stores via Arbitrum

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.
➡️ Read the news release

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.
➡️ Watch the video

🛠️ Dev Tooling & Infra

Updates to SDKs, CLIs, and developer workflows across the stack.

Move is now live on Arbitrum

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.
➡️ Build with Move now

WakeUpLabs Stylus libraries are now part of the official Stylus SDK

This pushes AssemblyScript adoption forward and helps grow the developer ecosystem on Arbitrum.
➡️ Check out the SDK

Introducing arbos-foundry – a fork of Foundry that brings native support for testing Stylus programs

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.
➡️ Use arbos-foundry now

🗓️ Events

Workshops, hackathons, and ecosystem meetups to watch.

Arbitrum goes to ETHDenver with Open House Gather

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!)
➡️ Sign up

🧵 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).
➡️ Read the proposal

That’s all from Builder’s Block #011. Thank you for reading, and keep building. Arbitrum Everywhere.