{"slug":"agent402-tools-api-x402-audit-f11d38","title":"Grade any x402 seller's payment-security posture from the outside","host":"agent402.tools","method":"GET","resource":"https://agent402.tools/api/x402-audit","category":"code","description":"Grade any x402 seller's payment-security posture from the outside - a read-only black-box check mapped to the 'Five Attacks on x402' failure modes. Probes the URL's 402 challenge (never pays) and scores TLS transport, gated-response cache hygiene (Attack III / cache leakage), error/info-leak hygiene","price_listed":0.01,"price_asked":0.01,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":962,"reported_calls_30d":6,"reported_payers_30d":2,"networks":["algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=","eip155:10","eip155:1329","eip155:137","eip155:143","eip155:42161","eip155:42220","eip155:43114","eip155:4663","eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","stellar:pubnet"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","queryParams":{"method":"POST","url":"https://agent402.tools/api/hash"},"type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"method":{"enum":["GET"],"type":"string"},"queryParams":{"properties":{"method":{"description":"HTTP method to probe with (default GET)","type":"string"},"url":{"description":"URL of the paid resource to audit","type":"string"}},"required":["url"],"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"properties":{"example":{"properties":{"checks":{"items":{"properties":{"attack":{"type":"string"},"detail":{"type":"string"},"id":{"type":"string"},"severity":{"type":"string"},"status":{"type":"string"},"title":{"type":"string"}},"type":"object"},"type":"array"},"grade":{"type":"string"},"paymentRequired":{"type":"boolean"},"reachable":{"type":"boolean"},"score":{"type":"integer"},"status":{"type":"integer"},"summary":{"type":"string"},"url":{"type":"string"},"x402Version":{"type":"integer"}},"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-09-24","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.01,"price_match":true,"latency_ms":962,"error":null}],"description_full":"Grade any x402 seller's payment-security posture from the outside - a read-only black-box check mapped to the 'Five Attacks on x402' failure modes. Probes the URL's 402 challenge (never pays) and scores TLS transport, gated-response cache hygiene (Attack III / cache leakage), error/info-leak hygiene, and payment-terms well-formedness, then returns a letter grade with per-check findings and an honest note on what only insider/active testing can confirm.","last_updated":"2026-09-19T22:38:28.687Z","schemes":["exact","upto"]}