Arbitrum Open House – London is the London edition of Arbitrum Open House 2026, a global initiative for founders and teams building the next generation of businesses on Arbitrum. After a New York kickoff that drew 177 project submissions, it lands in London from 10–12 July 2026.
Run in partnership with Encode Club, the core is the Arbitrum Founder House: an application-only, three-day, in-person program for teams who already have a product or prototype and want to accelerate execution, validate their direction, and deepen ecosystem connections. Selected teams get direct access to the Arbitrum Foundation, Offchain Labs, and sponsors including Robinhood Chain, AWS, Alchemy, GMX, and Dune, plus product, technical, GTM, and fundraising guidance. Participants can tap $300K in prizes and grants across a General Builder Track, Robinhood Chain Awards, an Agentic & AI Track, and Ecosystem Grants, most with milestone-based funding. Open to solo founders and teams already building on Arbitrum.
