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FractalAI x402 Notary
x402
FractalAI x402 Notary is a paid API for AI agents from fractalai.net.co, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Provides an independent ML-DSA-65 post-quantum attestation of an x402 payment settlement, acting as a cryptographic witness for the transaction.
Price / call$0.005
Success—
StatusUnknown
How this service works
FractalAI Notary: pay for an independent ML-DSA-65 attestation of an x402 settlement.
Output
An ML-DSA-65 post-quantum cryptographic attestation (witness/notarization) of the submitted x402 settlement payload, providing an independent third-party signature confirming the transaction occurred.
Example use cases
Audit trail for agent payment
“After our AI agent completes an x402 payment, get a FractalAI post-quantum notarization of the settlement so we have an independent cryptographic witness on file for the audit log.”
Dispute-proof payment evidence
“We just settled an x402 transaction and need tamper-proof proof it happened — can you send the payment body to the FractalAI Notary to get an ML-DSA-65 attestation we can use if there's ever a dispute?”
Regulatory compliance attestation
“For compliance purposes, I need every x402 payment our system makes to be independently attested with a post-quantum signature — submit this settlement JSON to the FractalAI x402 Notary and return the witness certificate.”
Technical details
Endpoint
POSThttps://fractalai.net.co/api/x402/witness?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need an independent, post-quantum (ML-DSA-65) third-party notarization of an x402 payment settlement — particularly for audit trails, compliance records, or dispute resolution where a tamper-proof cryptographic witness signature from a separate party is required. Prefer over self-attested records or weaker signature schemes.
Side effects
- Invalid or malformed x402 body returns a validation error
- Missing required fields (type, method, bodyType, body) causes a schema rejection
- Payment failure (insufficient USDC balance) results in a 402 response and no attestation
- Unsupported HTTP method (not POST/PUT/PATCH) causes an enum validation error
- Network timeout if the blockchain layer is unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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