{"uid":"cap_oaWv_K7QPVI116C9JTj8u","slug":"khotem-cryptographic-document-seal-document-15-995c2950","name":"KHOTEM Cryptographic Document Seal — Document #15","description":"Paid cryptographic witness services for autonomous agents and humans: seals, attestations, verification, audit, sealed document thread. x402-native micropayments, USDC on Base / Polygon / Solana, direct on-chain verification. No accounts, no API keys, no KYC.","url":"https://khotem.com/api/doc/15","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"type":"object","properties":{"queryParams":{"type":"object","properties":{},"description":"No input — GET returns the document after payment.","additionalProperties":false}}},"output":{"type":"object","properties":{"example":{"doc":"15","sha16":"a1b2c3d4e5f60708","content":"<document 15, markdown>","payment_seal":"1020304050607080"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.1","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":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_H2aqUz3LUlCj7JXK1B4X7","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a cryptographically sealed document (doc #15) with a SHA hash and payment seal after USDC micropayment verification on Base","exampleAgentPrompt":"Retrieve KHOTEM document #15 with a cryptographic seal — I need the SHA hash and payment seal as tamper-evident proof that this document was accessed and verified.","exampleUseCases":[{"title":"Tamper-evident contract retrieval","prompt":"Get me document 15 from KHOTEM with its cryptographic seal and SHA hash — I need unforgeable proof that this contract document was retrieved at this moment."},{"title":"Audit trail for compliance record","prompt":"Fetch KHOTEM document #15 and give me the payment seal and hash so I can attach a cryptographic witness to our compliance audit trail."},{"title":"Decentralized notarization without KYC","prompt":"I need to notarize access to document 15 without signing up anywhere — use KHOTEM to pay in USDC and get back the sealed document with its cryptographic proof."}],"resultDescription":"Returns a JSON object containing the document ID (15), the document content in markdown format, a 16-character SHA hash (sha16) of the document, and a payment_seal value that cryptographically links the payment on Base to the document retrieval event — together forming a tamper-evident witness record.","failureModes":["Payment not received or insufficient USDC: 402 Payment Required response, document not returned","Invalid or expired payment: seal not issued, transaction rejected","Document ID not found: 404 or empty content response","Network or Base blockchain congestion: delayed payment confirmation, timeout","Malformed request body: 400 Bad Request"],"whenToPreferThis":"Choose this endpoint when you need cryptographic proof-of-retrieval for a specific document, want a blockchain-anchored witness seal without signup or KYC, and are comfortable with USDC micropayments on Base via x402. Prefer this over traditional notary services when you need a decentralized, permissionless, instantly verifiable attestation tied to a specific document hash and payment event.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:31:33.028Z","isFirstParty":false}