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

📣 Announcements

Key updates from the Arbitrum ecosystem and Foundation.

Mentorship Program - Applications Open Until April 7th

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.
➡️ Apply for the Mentorship Program

NYC Open House Concludes With $340K in Awards

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.
➡️ Meet the 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.
➡️ Read the Stylus multi-contract workspace guide

Predictability at Peak Demand: Learn How Dynamic Pricing Works

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.
➡️ Learn How Dynamic Pricing Works

🔦 Ecosystem Highlights

Fresh launches and standout threads from around the Arbitrum ecosystem.

EdgeX Announces EDGE Chain on Arbitrum

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.
➡️ Read More

WalletConnect Pay Goes Live on Arbitrum

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.
➡️ Learn about WalletConnect Pay on Arbitrum

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.
➡️ See the Announcement

🛠️ 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.
➡️ Stylus SDK on GitHub

Robinhood Chain Testnet - Build With Simulated Stock Tokens

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.
➡️ Start building on Robinhood Chain

🧵 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.
➡️ Read the full AIP

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.
➡️ Cast your vote on Tally

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.
➡️ Read the OpCo March 2026 update

That’s all from Builder’s Block #013. Thank you for reading, and keep building. Arbitrum Everywhere.