Builder's Block #027: Learn about Arbitrum’s New Transaction Ordering & Ideas for Builders at Founder House Singapore

📣 Announcements

Key updates from the Arbitrum ecosystem and Foundation.

Product Ideas for Teams building at Founder House Singapore

Here are some ideas we're most excited about for founders building at the upcoming Founder House Singapore hosted in collaboration with Robinhood Chain.

Already building in one of these areas?

Apply below to bring these ideas onchain with technical, product, and GTM support, while competing for $300K in prizes and grants.

The Arbitrum Security Program is now live

The Arbitrum Foundation is subsidizing smart contract audits for teams building on the Arbitrum Platform including apps on testnet, projects on mainnet, migrating from another chain, and dedicated Arbitrum chains.

Get audited with the likes of OpenZeppelin, Cyfrin, Nethermind and many more.

Priority Gas Auctions (PGA) & Fast Feed are now live on Arbitrum

On Arbitrum One, PGA replaces Timeboost as the transaction-ordering policy, letting senders compete for earlier ordering by attaching a priority fee to each transaction. Fast Feed complements PGA by streaming transactions and ordering information as the sequencer adds transactions to the active block.

This guide covers how PGA and Fast Feed work, when to use them, and how to get started.

📚 Learn & Build

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

How does Priority Gas Auctions (PGA) Work

ArbOS Elara adds support for priority fee collection on Arbitrum chains, letting users attach a tip to their transaction to influence transaction ordering. Watch our DevRel Jess break down how it works.

What Arbitrum’s New Ordering Mechanism Unlocks for Developers

PGA + Fast Feed are now live on Arbitrum One, enabling priority fees for earlier execution, while Fast Feed gives subscribers faster access to ordered sequencer data.

Read how they unlock new opportunities for traders & DeFi.

How to Make the Most of Your Feedback Sessions at Founder House Singapore

Advice for teams getting ready to present their product at Founder House Singapore:

• Know your first user
• Prove your wedge
• Come prepared with the right questions

Our DevRel Ben shares a few practical tips to help you make the most of your feedback sessions

Founder Testimonial - Karamvir, Cofounder of The Risk Protocol

Karamvir and The Risk Protocol team joined us at Founder House London to build their tokenized risk product app and came out of the program with:

• A sharper product with 4,000+ daily active wallets
• 2nd place in the General Track with $40K prize
• Top 10 finalist at the Token2049 Nexus Startup Competition

Founders building innovative products across tokenization, AI, and finance can now register for our three-day, in-person Founder House in Singapore starting October 23rd.

🔦 Ecosystem Highlights

Fresh launches and standout threads from around the Arbitrum ecosystem.

Four Open House Teams Recognized at Token2049’s Startup Competition

Congrats to Liquida, TheRiskProtocol, and Bermuda on being selected as finalists to pitch at Token2049's Nexus Startup Competition, and to Agama Finance on being recognized in the Top 50 startups list

Arbitrum DAO Income Breakdown: Record $5M+ in Monthly Revenue

September marked a new milestone for Arbitrum, generating over $5M in monthly revenue. Revenue is up nearly 5x year-to-date, Priority Gas Auctions contributed $120K+ in their first week, and the Arbitrum platform has processed more than 1.5B transactions so far in 2026.

Arbitrum Leads Tokenized Credit Growth by Chain

Almost all of tokenized credit’s onchain growth in September occurred on Arbitrum One, which added $90M in value. Growth across the rest of the market remained largely unchanged, further reinforcing Arbitrum’s position as the leading destination for tokenized credit.

Meet Our Open House Singapore Community Partners

Shoutout to our community partners supporting Arbitrum Open House Singapore, where we’ve teamed up with Robinhood Chain to help founders take their MVPs from idea to launch through our Buildathon and Founder House programs.

🛠️ Dev Tooling & Infra

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

Nitro v3.12.1 is Now Fully Released

The release brings more resilient feed backfilling, improved operational visibility through new feed metrics, and a fix for tracing and simulation RPC crashes. The release also changes Stylus behavior, with activation now refused by default for eth_call and eth_estimateGas.

🗓️ Events

Workshops, hackathons, and ecosystem meetups to watch.

Founder House Singapore is Starting on October 23 with $300K in prizes and grants

Founder House Singapore is an application-only, three-day, in-person experience built for founders and teams who already have an existing product, prototype, or business and are actively building.

​Selected teams will spend three focused days with us and Robinhood Chain alongside fellow founders and mentors, to validate key assumptions, and receive direct feedback from the Arbitrum ecosystem.

🧵 Forum & Community Discussions

What builders are debating and proposing this week.

Security Council Executes Emergency Action on Arbitrum BoLD & Stylus

The Arbitrum Security Council executed an emergency action to add a new safety guard for BoLD’s One-Step Proof system and temporarily pause activation of new Stylus contracts on Arbitrum One and Nova. Existing Stylus contracts remain fully functional, EVM deployments are unaffected, and no user funds are at risk. The pause is intended to mitigate emerging AI-assisted attack vectors while the ecosystem discusses a path forward for Stylus activation.

[Constitutional] AIP: Establish an L1 Voting Recovery System

A new constitutional proposal would establish an L1 governance path on Ethereum as a last-resort recovery mechanism if ArbitrumDAO’s L2 governance becomes unavailable. The system would allow DAO proposals to be created, voted on, and executed on L1 using ARB voting power proven against confirmed Arbitrum state.

That’s all from Builder’s Block #027. Thank you for reading, and keep building. Arbitrum Everywhere.