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KHOTEM Cryptographic Document Seal — Document #15
x402
KHOTEM Cryptographic Document Seal — Document #15 is a paid API for AI agents from khotem.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).
Returns a cryptographically sealed document (doc #15) with a SHA hash and payment seal after USDC micropayment verification on Base
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 (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.
Example use cases
Tamper-evident contract retrieval
“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.”
Audit trail for compliance record
“Fetch KHOTEM document #15 and give me the payment seal and hash so I can attach a cryptographic witness to our compliance audit trail.”
Decentralized notarization without KYC
“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.”
Technical details
Endpoint
POSThttps://khotem.com/api/doc/15When to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object | |
| output | object |
Tags
x402
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