{"uid":"cap_zr02wTWVhR6zr2zji0ouW","slug":"fractalai-post-quantum-x402-signing-service-01c32231","name":"FractalAI Post-Quantum x402 Signing Service","description":"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.","url":"https://fractalai.net.co/api/x402/sign?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object"},"type":{"type":"string","const":"http"},"method":{"enum":["POST","PUT","PATCH"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"queryParams":{"type":"object","additionalProperties":{"type":"string"}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"digest":"9f86…","algorithm":"ml-dsa-65","signature":"BASE64_ML_DSA65_3309B","public_key":"BASE64_ML_DSA65_1952B"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_O3drwCTh7oRrfXr74YcVX","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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.","exampleAgentPrompt":"Sign this hex digest '9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08' using ML-DSA-65 post-quantum cryptography so I can verify the signature later.","exampleUseCases":[{"title":"Post-quantum document integrity attestation","prompt":"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?"},{"title":"Quantum-resistant API payload signing","prompt":"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?"},{"title":"Software release signing with FIPS 204","prompt":"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."}],"resultDescription":"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).","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T10:27:18.199Z","isFirstParty":false,"canonicalSlug":"fractalai-post-quantum-x402-signing-service-01c32231"}