{"uid":"cap_IS0rTmoH90wvMwl5SVHcu","slug":"khotem-cryptographic-document-seal-paid-verification-2e424cc9","name":"KHOTEM Cryptographic Document Seal — Paid Verification","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/17","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":"17","sha16":"a1b2c3d4e5f60708","content":"<document 17, 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_kx1MfkxtbihM3eJbF_51m","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":"Fetches a cryptographically sealed document by ID, returning its content along with a payment-verified seal hash proving the document was retrieved and paid for.","exampleAgentPrompt":"Can you retrieve document 17 from KHOTEM and give me the sealed, cryptographically witnessed copy — I need the content along with the SHA hash and payment seal as proof of retrieval?","exampleUseCases":[{"title":"Tamper-evident contract retrieval","prompt":"Pull document 17 from KHOTEM for me and return the sealed version — I need the content plus the payment seal hash so I can prove I accessed it at this exact moment."},{"title":"Auditable document access receipt","prompt":"I need a cryptographic receipt proving I retrieved document 17 right now — can you fetch it through KHOTEM and give me the SHA hash and seal included in the response?"},{"title":"Pay-per-access document witnessing","prompt":"Use KHOTEM to get me document 17 with its cryptographic witness seal — I want the full content and the payment-backed proof hash for my records."}],"resultDescription":"Returns a JSON object containing the document ID, the document content in markdown format, a 16-character SHA hex hash of the document, and a payment_seal hex string serving as a cryptographic witness that the document was retrieved under a valid USDC payment on Base.","failureModes":["Payment not received or invalid — 402 response with no document returned","Document ID does not exist — 404 or empty response","Insufficient USDC balance on Base for the $0.10 payment","Network or blockchain confirmation delay causing payment timeout","Malformed request body causing 400 error"],"whenToPreferThis":"Choose this endpoint when you need a tamper-evident, payment-backed cryptographic proof that a specific document was accessed at a given time — especially in audit, compliance, or legal contexts where a simple download is insufficient. It is particularly suited for no-signup, no-KYC workflows where USDC on Base is acceptable and the $0.10 per-call cost is appropriate. Prefer alternatives if you need bulk document retrieval, do not require a cryptographic seal, or cannot transact on Base.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:30:12.429Z","isFirstParty":false}