Open House London Launches: Arbitrum's Builder Program Expands to UK

๐Ÿ—๏ธ Arbitrum heads to London

By Arbitrum
Apr 16, 2026, 3:45 PM
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Following the success of Open House NYC in March, the Arbitrum Foundation is launching Open House London - a two-phase program for early-stage teams building AI, payments, or DeFi primitives.​

Program Structure:

  • 3-week online Buildathon for building and iteration
  • Top teams advance to an in-person Founder House in London
  • Technical workshops, product sessions, and hands-on mentoring
  • Investor pitching opportunities
  • $415K total in prizes and grants

The program is supported by the Arbitrum Foundation, Offchain, Robinhood Chain, and the broader ecosystem.​ Registration is now open at openhouse.​arbitrum.​io.​

This accelerator aims to help founders launch new businesses into the programmable economy on the Arbitrum Platform, building on the momentum from hundreds of teams and real businesses that emerged from the NYC edition.​

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