FractalAI x402 Proofs
https://fractalai.net.co/.well-known/x402.json Our Verdict
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Seven pay-per-call endpoints on Base (x402 v2, USDC via EIP-3009 gasless settlement) signing with ML-DSA-65/Dilithium-3 (NIST FIPS 204): message signing and verification, AI-decision attestation, and provenance/CBOM sealing, each response independently verifiable offline against the exact signed bytes returned; a companion `@x402/core` extension, [`@fractalai/x402-pqc-witness`](https://www.npmjs.com/package/@fractalai/x402-pqc-witness), adds the same post-quantum settlement attestation to any resource server.
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