{"uid":"cap_tWEKH6wBqnTchnLlLe4W8","slug":"khotem-cryptographic-document-seal-document-16-ce8f2f36","name":"KHOTEM Cryptographic Document Seal — Document #16","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/16","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":"16","sha16":"a1b2c3d4e5f60708","content":"<document 16, 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_KDG17zXRcbNWkCLUwi4E8","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 cryptographically sealed document #16 with a SHA hash and payment seal after USDC payment on Base","exampleAgentPrompt":"I need to retrieve KHOTEM document #16 with a cryptographic seal — pay the 0.1 USDC fee on Base and give me back the sealed markdown content along with its SHA hash and payment seal.","exampleUseCases":[{"title":"Retrieve sealed legal document","prompt":"Pull KHOTEM document 16 for me — pay the USDC fee and get me the sealed version with the cryptographic hash so I can prove it hasn't been tampered with."},{"title":"Anonymous notarization without signup","prompt":"I need a cryptographically witnessed copy of document 16 from KHOTEM — no account, just pay the 0.1 USDC on Base and hand me back the payment seal and SHA hash."},{"title":"Audit trail for compliance","prompt":"Fetch document 16 from KHOTEM with its payment seal and SHA-16 hash so I can attach it as a tamper-evident record in our compliance audit log."}],"resultDescription":"Returns a JSON object containing the document ID (16), a SHA-16 hash of the document content, the full document content in markdown format, and a payment_seal value that cryptographically proves the document was paid for and retrieved at a specific point in time.","failureModes":["Payment not confirmed on Base — returns 402 if USDC payment was not received","Invalid or duplicate payment — seal may not be issued","Network latency on Base chain causing payment confirmation delay","Document not found if doc ID is invalid"],"whenToPreferThis":"Choose this endpoint when you need a cryptographically verifiable, payment-attested copy of document #16 from KHOTEM without requiring user registration or KYC. Ideal when tamper-evidence and a blockchain-anchored payment seal are required as proof of document integrity at a specific moment.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:33:13.691Z","isFirstParty":false}