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KHOTEM Notary & Session Verification
x402
KHOTEM Notary & Session Verification is a paid API for AI agents from khotem.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).
Provides paid cryptographic notarization and session verification with audit trail via USDC micropayment on Base, no signup required.
Price / call$0.05
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 cryptographic seal or notarization certificate with a timestamp, verification status, and audit record proving the submitted content or session existed and was valid at the time of the call. Typically includes a proof hash, seal identifier, and audit log reference.
Example use cases
Seal a contract before signing
“I need to notarize this contract hash 0xdeadbeef... before we countersign it — get me a tamper-proof KHOTEM seal and audit timestamp, paying the USDC fee on Base.”
Audit trail for AI agent session
“After this agent session completes, create a KHOTEM verification record and seal for the session ID sess_9921 so we have a cryptographic audit trail of everything that happened.”
Prove data integrity for compliance
“We need to certify that this data payload hash 0x99fa12... was unchanged as of today for our compliance report — use KHOTEM to notarize it and give me the seal receipt.”
Technical details
Endpoint
POSThttps://khotem.com/api/verifyWhen to prefer
Choose this endpoint when you need a lightweight, permissionless cryptographic notarization or session verification without account creation or KYC. It is ideal for AI agents that need to seal documents, prove data integrity, or create audit trails on-demand with a $0.05 USDC micropayment on Base. Prefer it over traditional notary APIs when anonymity, no-signup access, and blockchain-backed proofs are required.
Side effects
- Insufficient USDC payment — payment below $0.05 or on wrong chain returns payment required error
- Invalid or malformed payload — missing required content hash or session data returns 400 bad request
- Payment not confirmed on Base — pending transaction may cause verification to fail or time out
- Duplicate submission — resubmitting same content within a short window may be rejected or treated as new record
- Network congestion on Base — blockchain confirmation delays may cause slow response or timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| sealrequired | object |
Output
Schema · Response
{
"ok": 1,
"total": 1,
"results": [
{
"ok": true,
"root": "9f2c…"
}
],
"verdict": "✓ ALL VERIFIED",
"payment_seal": "a1b2c3d4e5f60708",
"verdict_seal": "1020304050607080"
}Tags
x402
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