{"uid":"cap_BQIA5eU3BfkBEcOOGaL0B","slug":"groundcheck-signed-delivery-attestation-6da77d62","name":"Groundcheck Signed Delivery Attestation","description":"Signed delivery receipts for agentic commerce: submit what a paid service returned (plus its x402 settlement receipt and advertised schema) and receive an offline-verifiable Ed25519 attestation binding payment to delivery to grounded content — schema conformance, machine-verified claim verdicts, and a neutral accountability trail for disputes between agents and the services they pay.","url":"https://groundcheck.seiche.info/attest-delivery","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"service":{"type":"string","minLength":1,"description":"URL (or name) of the paid service whose delivery is being verified"},"max_claims":{"type":"integer","maximum":20,"minimum":1},"request_text":{"type":"string","description":"What was asked of the service (optional; bound by hash when given)"},"response_text":{"type":"string","minLength":1,"description":"The delivered payload, verbatim (JSON or prose)"},"payment_receipt":{"type":"string","description":"x402 settlement receipt from the paid call (X-PAYMENT-RESPONSE value, base64 or JSON)"},"advertised_schema":{"type":"object","description":"JSON schema the service advertised for its output"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_CWpV4xFjAWkYdYxJkB3yC","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Issues an offline-verifiable Ed25519 attestation that binds an x402 payment receipt to the delivered payload, verifying schema conformance and claim verdicts for agentic commerce accountability.","exampleAgentPrompt":"I just paid a financial data API via x402 and got a response — can you submit the response payload, the X-PAYMENT-RESPONSE receipt, and the service's advertised JSON schema to Groundcheck and get back a signed Ed25519 attestation confirming the delivery matches what was paid for, checking up to 10 claims?","exampleUseCases":null,"resultDescription":"An offline-verifiable Ed25519 attestation that cryptographically binds the x402 payment receipt to the delivered response payload, including schema conformance results, machine-verified claim verdicts (up to 20), and a neutral accountability trail suitable for dispute resolution between agents and paid services.","failureModes":["Invalid or malformed x402 payment receipt returns 400 with receipt parse error","Response payload fails schema validation — attestation issued but conformance field is false","Service URL not resolvable or not recognized — may return 422","max_claims exceeded (>20) returns 400 validation error","Malformed JSON in advertised_schema causes 400 schema parse error","Payment processing failure for the $0.05 USDC fee returns 402"],"whenToPreferThis":"Use this endpoint when an AI agent has paid for a service via x402 and needs cryptographic proof that the payment, delivery, and schema conformance are all bound together — especially when dispute resolution or auditability between agents and paid services is required. Prefer this over informal logging when the agent needs an offline-verifiable, third-party attestation rather than self-reported records.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:35:49.627Z","isFirstParty":false}