{"slug":"api-aiskills402-com-v1-run-payment-header-check-9ca31e","title":"Payment Header Check API","host":"api.aiskills402.com","method":"POST","resource":"https://api.aiskills402.com/v1/run/payment-header-check","category":"other","description":"Payment Header Check API: reads an x402 PAYMENT-SIGNATURE header before you send it - base64/UTF-8/JSON, version, authorization fields, clock window, who signed (lane a or b) and, with the seller PAYMENT-REQUIRED, payTo/amount/network/asset. Nothing is sent anywhere. $0.005 USDC per check. POST JSON","price_listed":0.005,"price_asked":null,"state":"effects","state_label":"Not tested: has real-world effects","checks_7d":0,"answered_7d":0,"latency_ms_median":null,"reported_calls_30d":2,"reported_payers_30d":2,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"payment_required":null,"payment_signature":"eyJ4NDAyVmVyc2lvbiI6MiwiYWNjZXB0ZWQiOnsic2NoZW1lIjoiZXhhY3QiLCJuZXR3b3JrIjoiZWlwMTU1Ojg0NTMiLCJhbW91bnQiOiIxIiwiYXNzZXQiOiIweDgzMzU4OWZDRDZlRGI2RTA4ZjRjN0MzMkQ0ZjcxYjU0YmRBMDI5MTMiLCJwYXlUbyI6IjB4MDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMCIsIm1heFRpbWVvdXRTZWNvbmRzIjo2MCwiZXh0cmEiOnsibmFtZSI6IlVTRCBDb2luIiwidmVyc2lvbiI6IjIifX0sInBheWxvYWQiOnsiYXV0aG9yaXphdGlvbiI6eyJmcm9tIjoiMHhhNjk2NTY1Y0ZlM2Y2NWNkRDAxMzJhMDJlNDA4QzM5NDE4RDhjRTQ3IiwidG8iOiIweDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAiLCJ2YWx1ZSI6IjEiLCJ2YWxpZEFmdGVyIjoiMCIsInZhbGlkQmVmb3JlIjoiMTc5ODc2MTYwMCIsIm5vbmNlIjoiMHg1ZTVlNWU1ZTVlNWU1ZTVlNWU1ZTVlNWU1ZTVlNWU1ZTVlNWU1ZTVlNWU1ZTVlNWU1ZTVlNWU1ZTVlNWU1ZTVlIn0sInNpZ25hdHVyZSI6IjB4NzJkN2RiZWI4ZDNiMmQxOWRlOWJlNTkzOWM2YzM1NWI0ZDEwN2JmOTBiZTA4YTRkZDhhYjI4MjE0ZWVhNzA3YTQxMzdkZTM5NTQzMDhjNWNlYWE0OWE0YTNkNTE3MDBkMzUyYzMxNzc4MTU2MGQ5Nzk0YjE0MmQwMTkzMDJkYWYxYiJ9fQ=="},"bodyType":"json","headers":{"content-type":"application/json"},"method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"additionalProperties":false,"properties":{"payment_required":{"description":"Optional: the seller PAYMENT-REQUIRED header value, for a cross-check of payTo, amount, network and asset.","maxLength":16384,"type":["string","null"]},"payment_signature":{"description":"The value of the PAYMENT-SIGNATURE (or X-PAYMENT) header you are about to send. It is only read here, never sent anywhere.","maxLength":16384,"minLength":1,"type":"string"}},"required":["payment_signature"],"type":"object"},"bodyType":{"enum":["json"],"type":"string"},"headers":{"additionalProperties":{"type":"string"},"type":"object"},"method":{"enum":["POST"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[],"description_full":"Payment Header Check API: reads an x402 PAYMENT-SIGNATURE header before you send it - base64/UTF-8/JSON, version, authorization fields, clock window, who signed (lane a or b) and, with the seller PAYMENT-REQUIRED, payTo/amount/network/asset. Nothing is sent anywhere. $0.005 USDC per check. POST JSON {payment_signature, payment_required?}; free example at https://api.aiskills402.com/v1/run/payment-header-check/example","last_updated":"2026-10-16T22:45:42.885Z","schemes":["exact"]}