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KHOTEM Cryptographic Document Seal — Paid Verification
x402
KHOTEM Cryptographic Document Seal — Paid Verification is a paid API for AI agents from khotem.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-13).
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.
Price / call$0.1
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Tamper-evident contract retrieval
“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.”
Auditable document access receipt
“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?”
Pay-per-access document witnessing
“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.”
Technical details
Endpoint
POSThttps://khotem.com/api/doc/17When to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object | |
| output | object |
Tags
x402
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