Arbitrum Developers

London is where startups, capital, and real-world adoption meet! 🚀 We're supporting @arbitrum's Founder House in London at @encodeclub — a 3-day event for early-stage founders building on Arbitrum. 🇬🇧 July 10–12, 2026 💰 $300K in prizes & grants 🤝 Direct access to @arbitrum, @OffchainLabs, @RobinhoodApp Chain, AWS & mentors Limited spots ↓ luma.com/openhouse-lond…

@AngelHack @arbitrum @encodeclub Big things ahead for builders in London 🤝🏻

@ETHCluj Appreciate the support; this will help more early teams ship faster 🫡

During ETHCluj this year we hosted a full day of Arbitrum workshops as part of our dedicated Educational Track. We designed the workshops around onboarding the next wave of builders into the ecosystem and offer them a chance to learn, whether they were already familiar with blockchain technology or not. A few ideas that stood out: 🔹Stylus is opening the door for developers to build on Arbitrum using more familiar programming languages 🔹The dev experience is rapidly improving, lowering barriers to entry 🔹The focus is real-world applications, not just experimentation As part of the workshops, we challenged participants to go beyond smart contracts and integrate frontend components into their applications. The goal is to help developers think end-to-end. From protocol → to product → to user experience. And at the same time, contribute to a growing open-source collection of projects created during ETHCluj. The recording of these sessions is now available on the ETHCluj YouTube channel for anyone curious or looking to use it as a learning resource 👇 youtu.be/aHRyUUGH3L4?si…

@ETHBucharest_ @arbitrum @encodeclub Excited to see this coming together 🤝🏻

London is where startups, capital, and real-world adoption meet. ETH Bucharest is supporting @arbitrum Founder House in London, hosted at @encodeclub. 3 days. Early-stage founders. Real feedback from people who matter. London | July 10-12 $300K in prizes & grants

@CML_LDN @arbitrum Big things ahead for builders in London 🇬🇧

Most startups don't fail because of a lack of ideas. They fail because they don't get the right feedback, network, or support early enough. That's why we're supporting @arbitrum Founder House London 🇬🇧 London | July 10–12, 2026: • $300K in prizes & grants • Direct access to @Arbitrum, @Offchain, @RobinhoodApp Chain, @awscloud and ecosystem mentors for technical, business, and GTM feedback • Apply with an existing project or come ready to build new businesses on Arbitrum Limited spots. Apply now: luma.com/openhouse-lond…

@DeVinciBC @arbitrum 🤝

🏛️ @DeVinciBC x @arbitrum for the Founder House in London !! London is where startups, capital, and real-world adoption meet. 3-day in-person residency for founders building on Arbitrum, July 10-12. Apply: luma.com/openhouse-lond… by @DeVinciBC

London is where startups, capital, and real-world adoption meet! We’re hosting Arbitrum’s Founder House in London, at Encode Hub, a 3 day in-person event for early stage founders and teams building their ventures on Arbitrum. London | July 10-12, 2026: • $300K in prizes & grants • Direct access to @Arbitrum, @Offchain, @RobinhoodApp Chain, AWS and ecosystem mentors for technical, business, and GTM feedback • Apply with an existing project or come ready to build new businesses on Arbitrum Limited spots. Apply now ↓

Agentic Commerce goes far beyond AI agents making payments. This article by @blockbyvlog highlights why it matters and gives an intro to how agents interact and how value is exchanged between them. Worth a read if you’re building for the agentic economy 👇🏻

@pactnetwork_io @arbitrum Congrats!

🚨JUST IN🚨 Team shipping hard, and we won 3rd place on the @arbitrum Buildathon! Saving @arbitrum users and @ArbitrumDevs money !! LFG!

Happening in 30 minutes live! 📹 Want to get started with agentic commerce? Don't know how to start? Let's get you going with @arbitrum and @awscloud! luma.com/x402-aws-arbit…

This is important if you're building onchain agents that manage micropayments. You can't afford volatile gas fees. You need predictability. Here’s what's changed for Arbitrum’s gas fee model 👇

What’s next for founders? Winning teams will join other early-stage teams at Founder House London on July 10-12. They’ll spend 3 days alongside industry leaders refining their products, accelerate development & launch into the programmable economy. Apply today 👇🏻 luma.com/openhouse-lond…

Open House London Buildathon brought together 780+ builders from London & around the world to turn ideas into onchain businesses on the Arbitrum Platform. Over 3 weeks of building, 278 projects were submitted, and these teams rose to the top. Check out what they've built 👇🏻

If you are unable to upgrade, please make sure you set `--node.transaction-streamer.shutdown-on-blockhash-mismatch` to `true` to ensure nodes gracefully shut down when encountering a mismatch between the feed and a local block. Thanks

- For Arbitrum Sepolia node operators: action is required to upgrade your node to Nitro v3.11.0 before June 29 15:00 UTC. Failure to do so will mean your node will not be able to sync with Arbitrum Sepolia

Hello! During testing and monitoring, a bug was discovered on Arbitrum Sepolia relating to ArbOS 60 and its ability to charge accurate gas prices for transactions.

There is one place you want to be this summer if you want to transform your project from hackathon winner to a real startup. .@arbitrum Open House London-maxxing. 🇬🇧 Check out the details below 👇

Builder’s Block #019 is live! This edition covers LG Electronics piloting an onchain advertising network on Arbitrum, the full lineup of sponsors of Open House London, the Architecture of the Programmable Economy and much more. Dive in 👇🏻 blog.arbitrum.foundation/builders-block…