{"slug":"numberintel-dev-v1-attest-ed0077","title":"Signed settlement attestation","host":"numberintel.dev","method":"POST","resource":"https://numberintel.dev/v1/attest","category":"market","description":"Signed settlement attestation: we make a REAL x402 purchase from your target endpoint (up to $0.1), grade the delivered response against its advertised schema, and return an EIP-191-signed attestation embedding the on-chain USDC receipt. Proof-of-real-delivery for directories, reputation systems and","price_listed":0.25,"price_asked":null,"state":"effects","state_label":"Not tested: has real-world effects","checks_7d":0,"answered_7d":0,"latency_ms_median":null,"reported_calls_30d":3,"reported_payers_30d":1,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"max_spend_usd":0.05,"method":"GET","target":"https://api.example.com/v1/data"},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"properties":{"body":{"description":"JSON body for POST targets","type":"object"},"max_spend_usd":{"description":"cap on target spend, hard max 0.1","type":"number"},"method":{"description":"GET or POST","type":"string"},"target":{"description":"https URL of the x402 endpoint to buy from","type":"string"}},"required":["target"],"type":"object"},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"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":"Signed settlement attestation: we make a REAL x402 purchase from your target endpoint (up to $0.1), grade the delivered response against its advertised schema, and return an EIP-191-signed attestation embedding the on-chain USDC receipt. Proof-of-real-delivery for directories, reputation systems and sellers.","last_updated":"2026-09-21T06:17:10.495Z","schemes":["exact"]}