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Arbitrum Open House Singapore Online Buildathon 🇸🇬
Arbitrum has officially opened registration for the Open House Singapore Online Buildathon. Submissions run from September 13 to October 4, 2026, followed by reward announcements on October 12.
The buildathon offers $115,000 USDC total across three main prize categories. The Overall Prize features $70K (40K for 1st, 20K for 2nd, 10K for 3rd), the Promising Products Track offers $15K (7K for 1st, 5K for 2nd, 3K for 3rd), and up to $30K is set aside for milestone-based grants on a case-by-case basis. At least one prize in each top category is reserved for builds on Robinhood Chain and standard Arbitrum. Additionally, the top 3 overall teams earn an automatic invitation to the in-person Founder House in Singapore from October 23 to 25 to work directly with Arbitrum engineers.
You can build using standard Solidity or Stylus in Rust or C++, provided your deployment target is on an Arbitrum chain such as Sepolia, Arbitrum One, or Robinhood Chain. Submissions will be evaluated on smart contract quality, product-market fit, innovation, and real-world problem solving.
You can register and check the full details here: https://www.hackquest.io/hackathons/Arbitrum-Open-House-Singapore-Online-Buildathon
Drop a comment below if you're looking for teammates or planning to submit a build!
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