The Arbitrum Builder's Block: #001
Builder's Block is a biweekly educational newsletter from the Arbitrum Foundation focused on delivering you the latest developer news surrounding the Arbitrum tech stack and ecosystem.
Whether you're building on the Arbitrum platform with Rust or Solidity, we've got you covered.
Announcements
Key updates from the Arbitrum ecosystem and the Foundation.
Arbitrum Open House: Kicking off with India
Openhouse is a hands-on builder experience featuring virtual workshops, regional buildathons, IRL hacker houses, and an invite-only accelerator for top teams. We are starting the Open House journey from India. At Bengaluru, you can meet our team for an IRL Hacker House in September.
➡️ Register now
Open House Learn is now live
Open House Learn is the first phase of the Open House program. It is a beginner-friendly program designed to help you start your journey on Arbitrum. You can register and jump in at any time!
• Hands-on workshops
• AMAs with our team
• Interactive courses
➡️ Find the agenda here
➡️ Register now
Open House Build is open for registrations, to start Aug 22nd
Open House Build is the second phase of the Open House program. You will embark on a 3-week online buildathon where you will receive mentorship, workshops and create innovative projects with $33k in prizes.
• Hands-on workshops
• Friendly pitch sessions
• Mentor support
➡️ Register now
Introducing the $10M Arbitrum Audit Program, one of crypto’s largest audit grants!
Early-stage projects building (or planning to build) on Arbitrum can now apply for third-party audit grants and investments.
➡️ Apply today and learn more
ArbiFuel is still live: Arbitrum Builders, Claim Your Gas Fee Sponsorship
At Arbitrum, builders come first. That’s why we’ve launched ArbiFuel, a Gas Fee Sponsorship Program to help early-stage teams ship faster, test freely, and onboard users without worrying about gas costs.
➡️ Apply now
Learn & Build
New learning drops and hands-on resources from across the Arbitrum ecosystem.
Stylus
Curious what Move looks like on Arbitrum?
In this article, @baygeeth breaks down how @rather_labs is bringing the Move programming language to Stylus, and the new possibilities it unlocks for developers building on Arbitrum.
➡️ Read the article
AssemblyScript + Stylus: In Action!
WakeUp Labs have been working on integrating AssemblyScript with the Arbitrum Stylus SDK. TypeScript and script-like language devs will be able to write smart contracts for Arbitrum more easily.
➡️ Watch the video
Templates & Starter Kits
Here's a 3-min breakdown of a full-stack starter kit for building Farcaster Mini Apps with Arbitrum Stylus
React frontend, wallet connect, and Rust smart contracts — all set up and ready to ship.
➡️ Grab the template
➡️ Watch the 3 minute tutorial
➡️ Read the blog for a step by step tutorial
Ecosystem Highlights
Fresh launches and standout threads from around the Arbitrum ecosystem.
GetBlock just deployed regional ARB RPC support in New York & Singapore
To help you test, scale, and launch faster, they're opening up 50M CU/month on their Shared plan — at no cost.
➡️ Here's how to get access
The most comprehensive GMX Perpetuals Trading course, taught by @ProgrammerSmart, is now live on @CyfrinUpdraft
Build GMX-based protocols from the ground up:
🔹 Mechanics, fees, funding math
🔹 Order types, liquidations, ADL
🔹 GLP, staking, delegation
➡️ Read the thread + article
Trailblazer 2.0 is still ongoing
Don’t sleep on free funding! If you’re tinkering with EmberAGI's Vibekit, we’re offering $1 million in grants to support builders who launch agents, agent templates, or any of the contributions below with VibeKit, demonstrating clear utility and performance, with a cap of $10k per submission.
➡️ Apply here
Dev Tooling & Infra
Updates to SDKs, CLIs, and developer workflows across the stack.
StylusPort is now live: a full migration framework for moving Solana programs to Stylus
Learn how to write EVM interoperable smart contracts on Arbitrum using Stylus, without leaving your Rust comfort zone. A collaboration between Oak Security, Range, and Arbitrum.
➡️ Read the full post
➡️ Interested in porting a program from Solana to Stylus? Take the developer survey.
OpenZeppelin Contracts for Stylus v0.3.0-alpha.1 is live
Upgradeable proxies, ZK-optimized curves, and thoughtful access control improvements — big step forward for secure, Rust-native EVM apps.
➡️ Read the thread for details
➡️ Check it out on GitHub
Introducing the OpenZeppelin Contracts MCP
Build secure, OpenZeppelin-standard smart contracts directly in Cursor, Anthropic, Windsurf, or any AI assistant. Now available on Arbitrum Stylus.
➡️ Try it out now
Audited release of the OpenZeppelin Rust Contracts for Stylus v0.2.0 is here
DeFi, NFT infra, royalties, vaults, wrappers, and more.
➡️ Check out the new features
Request for feedback regarding planned move of getL1Confirmations & findBatchContainingBlock to native arb_* RPC methods
We plan to make some changes to frequently used helper functions that many dapps and tools call indirectly through the Arbitrum SDK.
➡️ View details of the planned migration & share your feedback
Introducing a full GUI for the Stylus Cache Manager, built by CoBuilders.
Stylus contracts can reserve cache slots for faster and cheaper execution. But managing those slots requires constant bidding and manual monitoring.
CoBuilders built a frontend that makes it seamless:
🔹 One-click & automated bidding
🔹 Real-time alerts via Slack/Telegram
🔹 Dashboards with bid + slot visualizations
🔹 Fully open source
➡️ Try it out now
Events
Workshops, hackathons, and ecosystem meetups to watch.
August 13 – Builder night with @farcaster_xyz
Come chat with fellow devs about everything from Mini Apps to DeFi
➡️ Register now
August 14 – Unlocking High-Performance Rust Smart Contracts on Arbitrum Stylus with OpenZeppelin: Open House Learn
Learn how to build secure Rust contracts leveraging the OpenZeppelin Rust SDK and learn about best practices for Stylus.
➡️ Register now
Open House India Gather: August 16,17, 23 and 24
Open House Gather is a series of IRL Gatherings in India (Hyderabad, Pune, Mumbai and Delhi), co-organised by the Arbitrum Foundation and Arbitrum Ambassadors to cover the ins and outs of our Ambassador and Open House Builder Program.
What to Expect at Open House Gather:
- Crisp keynotes and Q&A about Arbitrum's goals in India, Ambassador Program and Open House Program.
- Opportunities to share what’s working, what’s challenging, and what support you’d like to see from Arbitrum in India
- Swag, snacks, and good vibes
➡️ Register now for OH Gather Hyderabad
➡️ Register now for OH Gather Delhi
➡️ Register now for OH Gather Pune
➡️ Register now for OH Gather Mumbai
Forum & Community Discussions
What builders are debating and proposing this week.
Arbitrum Gaming Ventures Monthly Report (July 2025)
TL;DR: Hired a grants lead, new playtests, Transparency Report released
➡️ Read the full thread
Disclosure of support for EIP-2537 on Arbitrum One and Nova
Offchain Labs (OCL) has recently been made aware that the precompiled contracts for performing various operations over the BLS12-381 elliptic curve, including BLS signature verification, were added but not properly enabled in ArbOS 40 Callisto as originally expected. Read on for what that means and what's being done about it.
➡️ Read more
Register $BORING in the Arbitrum generic-custom gateway
https://superboring.xyz is about to expand to Arbitrum, thus the $BORING token shall become bridgeable to Arbitrum.
➡️ Join the discussion and vote
Disable Legacy Tether Bridge
This proposal seeks to disable the legacy USDT bridge for Arbitrum One, given the activation of the new USDT0 bridge in January 2025.
➡️ Read more
That’s all from Builder’s Block #1. Thank you for reading, and keep building. Arbitrum Everywhere.