Agents on Open Rails is a hackathon run by Loops House in the Celo ecosystem for builders shipping AI agents that transact on Celo mainnet using live payment rails. Tracks cover local-currency stablecoin products in Latin America, foreign exchange settlement, USA₮ payments through x402 and paying for third-party services, with a US$5,000 prize pool. Submissions close on 9 November, with in-person builder sessions held in Argentina.