Open Rails AP-Check is a pay-per-call accounts-payable control service for AI agents. An agent posts an invoice and gets an HTTP 402 challenge with x402-style payment terms (scheme, chain, asset, payTo, amount). The agent pays on Celo, then retries with the transaction hash. The service reads the receipt from Celo and checks the payee, amount, success, recency and single use. It then returns APPROVE, REVIEW or HOLD with flags: line and total math errors, duplicate invoices, a remit-to bank account that differs from the vendor record (business-email-compromise risk), PO overrun, high tax, large round amounts, and bad dates.
Built by Shyam Desigan, CFO, encoding the checks a finance team runs before money moves.
Honest scope: TESTNET ONLY. All proof is on Celo Sepolia (chain 11142220); no mainnet payments were made. Settlement is a direct on-chain transfer that the seller verifies; it does not use the Celo x402 facilitator. No ERC-8021 tag was applied and the ERC-8004 ID is not registered yet.
Loops House
