Arbitrum to Start Open House London Buildathon on May 25th

Name: Open House London Buildathon
Start: 2026-05-25T00:00:00Z
End: 2026-05-26T00:00:00Z

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Arbitrum will start Open House London on May 25th. The three-week online buildathon offers a $415,000 prize pool for early-stage teams building new businesses for the programmable economy.

Event date: May 25, 2026 UTC

Arbitrum
@arbitrum

The programmable economy needs new businesses.

Open House London is helping bootstrap them with a $415K prize pool (our largest yet).

Starting May 25th, early-stage teams join a 3-week online Buildathon to:

- Bring ideas from concept to mainnet
- Receive technical guidance via

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