{"name":"x402 Base USDC Payment Checker","description":"Verify a Base mainnet USDC payment by tx hash: confirmations, real-USDC transfers, expected recipient/amount match, fake-token and lookalike-address warnings, and who funded the payer (external vs self_funded).","pricing":{"POST /check":"$0.01 USDC per call via x402 (HTTP 402)","network":"eip155:8453","payTo":"0x509E55c4F898B43C856Fb0E51048B1b7bFBC9eDE","free":["GET /","GET /openapi.json","POST /demo"]},"usdcContract":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","request":{"method":"POST","path":"/check","body":{"txHash":"0x…64 hex","expectedPayTo":"0x… (optional)","expectedAmount":"1.5 (optional, USDC decimal)"}},"demo":{"method":"POST","path":"/demo","note":"free; always runs on fixture tx 0xc37cbdfa44230f05129348d5160254abf354791d79de68228b201ba09de143c1"},"funding":{"windowBlocks":50000,"verdicts":["external","self_funded","unknown"]},"docs":"/openapi.json"}