{"proof_id":"rc-proof-x402-2026-10-06","what":"An external integrator paid for one ReturnCheck verdict over x402, then replayed the identical request and was not charged again.","executed_on":"2026-10-06","reconciled_on":"2026-10-07","endpoint":"/v1/check","protocol":"x402 v2","network":"eip155:8453","network_name":"Base mainnet","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","asset_name":"USDC","amount_atomic":"20000","amount_usdc":"0.02","payer":"0xE50c5212e8211639C49276dA190E248B83935763","pay_to":"0xbF428071027402E9b0cE85e22146EDdc028cEB3b","transaction":"0xdc577f237a8502d25771baceda86738a9b2eb5f516e11f51a314f8dbfe751291","receipt_status":"0x1","block":52260342,"verdict":"YES_WITH_CONDITIONS","check_id":"fdec5138-863e-42a2-be90-f58036bbd6d9","replay":{"result":"HTTP 200","cost":"0.0000","settlement":"replay","same_transaction":true,"same_check_id":true,"second_charge":false},"reconciliation":{"method":"Base mainnet public RPC, read directly from an independent machine","blocks_reviewed":1500,"filter":"USDC contract, Transfer event, this payer and this recipient","matching_transfers":1,"second_matching_transfer":false},"not_claimed":["a commercial customer","recurring revenue","an audit or third-party certification"],"verify_yourself":"https://basescan.org/tx/0xdc577f237a8502d25771baceda86738a9b2eb5f516e11f51a314f8dbfe751291","warning":"Executed 2026-10-06, reconciled on-chain 2026-10-07. One payment, one replay, no second charge.","check_endpoint":"https://returncheck.m-angelmartinez-fer.workers.dev/v1/check"}