Arbitrum Open House São Paulo: Online Buildathon

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Registration opens Dec 24, 2026 on HackQuest; submissions run Feb 8 to Mar 1, 2027.

The Arbitrum Foundation's next online buildathon, hosted on HackQuest: 115,000 USDC across an Overall track, a Promising Products track and milestone grants. At least 1 of 3 prizes in each track is reserved for a project building on Robinhood Chain. Existing projects are welcome. Registration opens Dec 24, 2026.

Who can apply

No special requirements are listed.

Rules

  • Online buildathon. HackQuest lists registration from Dec 24, 2026 to Mar 1, 2027, submissions from Feb 8 to Mar 1, 2027, and rewards announced Mar 8, 2027.
  • Your project must be deployed on an Arbitrum chain to qualify, for example Arbitrum Sepolia, Arbitrum One or Robinhood Chain.
  • At minimum 1 of 3 prizes in the Overall and Promising Products tracks is reserved for a project building on Robinhood Chain (and 1 of 3 for one building on Arbitrum).
  • Bring an existing project or start from scratch. Build with Solidity or with Stylus (Rust).
  • All prizes are subject to development-tied milestones. Grants are milestone-based and case by case; selection isn't guaranteed.
  • Submission requirements are not published yet.
All programs

Sources:program page