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FractalAI Post-Quantum x402 Signing Service
x402
FractalAI Post-Quantum x402 Signing Service is a paid API for AI agents from fractalai.net.co, paid per call via x402, $0.02/call, status down (last checked 2026-10-13).
Signs a hex digest using ML-DSA-65 (CRYSTALS-Dilithium / NIST FIPS 204) post-quantum cryptography and returns a verifiable base64 signature with public key via the x402 payment protocol.
Price / call$0.02
Success—
StatusDown
How this service works
The first AI-native Layer 1 blockchain built from scratch in Rust. Post-quantum cryptography (CRYSTALS-Dilithium), Proof of Fractal Work consensus, WASM smart contracts, and 460+ RPC endpoints. Mine FRAC tokens with fractal analysis instead of hash puzzles.
Output
Returns a JSON object containing: the algorithm name ('ml-dsa-65'), the original hex digest, a base64-encoded 3309-byte ML-DSA-65 signature (NIST FIPS 204 / Dilithium-3), a base64-encoded 1952-byte public key for offline verification, and optionally a payment settlement receipt with transaction details (scheme, network, asset, txHash, payer, settled status).
Example use cases
Post-quantum document integrity attestation
“I have a SHA-256 hex digest of a legal contract — '3a7bd3e2360a3d29eea436fcfb7e44c735d117c42d1c1835420b6b9942dd4f1b' — can you sign it with post-quantum ML-DSA-65 so I can include the signature and public key in the audit trail?”
Quantum-resistant API payload signing
“Before I transmit this API payload to a partner, I need a Dilithium-3 post-quantum signature over its SHA-256 digest 'b94d27b9934d3e08a52e52d7da7dabfac484efe04294e576f03e8b9f8c9e0fb0' — can you get me the base64 signature and public key?”
Software release signing with FIPS 204
“We're releasing a software binary and need a NIST FIPS 204 compliant ML-DSA-65 signature over its hex digest 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855' to include in our release manifest for quantum-safe verification.”
Technical details
Endpoint
POSThttps://fractalai.net.co/api/x402/sign?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a post-quantum (quantum-computer-resistant) digital signature using the NIST FIPS 204 standard (ML-DSA-65 / CRYSTALS-Dilithium-3). Prefer it over classical ECDSA or RSA signing when future-proofing against quantum threats is a requirement, when compliance with NIST post-quantum standards is needed, or when integrating with the FractalAI blockchain ecosystem. The x402 micropayment model makes it suitable for per-use agent workflows at $0.02 per call.
Side effects
- Invalid or malformed hex digest — returns error indicating bad input format
- Payment failure or insufficient USDC balance via x402 — returns 402 Payment Required
- Signature generation failure on the blockchain node side — returns 500 server error
- Malformed x402 payment header — returns 400 or 402 indicating payment protocol error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"digest": "9f86…",
"algorithm": "ml-dsa-65",
"signature": "BASE64_ML_DSA65_3309B",
"public_key": "BASE64_ML_DSA65_1952B"
}
}Tags
x402
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