$115,000
Arbitrum Open House Singapore: Online Buildathon is a three-week online buildathon hosted by Arbitrum Foundation, with submissions open from September 13–October 4, 2026. Participants can build with Solidity or Stylus, deploy on Arbitrum One or other Arbitrum chains, and enter with a new or existing project.
The buildathon has $115,000 in available prizes and grants: $70,000 for the overall track, $15,000 for the Promising Products Track, and up to $30,000 in milestone-based grants for selected projects. The top three teams also earn a place at the in-person Founder House in Singapore. Registration closes October 2, with winners scheduled to be announced on October 12.
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