FractalAI Attest Decision

x402

FractalAI Attest Decision is a paid API for AI agents from fractalai.net.co, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-29).

Creates a post-quantum cryptographically signed attestation of an AI agent decision, anchoring it to a tamper-evident append-only Black Box with on-chain sealing via ML-DSA-65 (CRYSTALS-Dilithium) signatures.

Price / call$0.05

Seller volume →—

Success—

StatusUnknown

How this service works

Pay-per-Attestation: an AI agent pays to seal its own decision (input hash, output, model, timestamp) in FractalAI's post-quantum L1 — Dilithium-3 (NIST FIPS 204) signed, Black-Box chained; on-chain anchoring (VAID-1) is attempted per call and reported in the response. Returns a re-verifiable receipt. Built for EU AI Act Art.12 record-keeping. x402-native.

Output

Returns a JSON object containing an entry_hash (sha256 of the chained decision), input_hash and output_hash (sha256 of declared inputs/outputs), a 3309-byte ML-DSA-65 signature over the decision, the corresponding public key, the exact signed_message bytes for offline verification, a sequence number in the append-only Black Box, an optional permalink to the on-chain Dilithium-2 anchor, a prev_hash linking to the previous entry for tamper-evidence, a payment receipt, and an attestation_hash for re-verifiable on-chain proof.

Example use cases

Audit trail for autonomous agent actions

“I need a cryptographic proof that my AI agent decided to approve a $10,000 loan application for user ID 4821 — can you create a post-quantum signed Black Box entry on FractalAI with the input being the loan application data and the output being the approval decision?”

Compliance record for regulated AI outputs

“Our medical AI just recommended a treatment plan — attest that decision on FractalAI with the patient query as input and the treatment recommendation as output so we have a Dilithium-signed, on-chain verifiable compliance record.”

Tamper-evident log of content moderation

“The content moderation agent just flagged a post as violating community guidelines — seal that decision in the FractalAI Black Box with the flagged content as input and 'removed: hate speech' as output so it's permanently anchored and auditable.”

Technical details

Endpoint

POSThttps://fractalai.net.co/api/x402/attest-decision?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need post-quantum cryptographic attestation of AI agent decisions with tamper-evident chaining and optional on-chain anchoring. It is uniquely suited for AI governance, compliance, and audit use cases where NIST FIPS 204 ML-DSA-65 (Dilithium) signatures are required for quantum-resistant proof of decision integrity. Prefer this over traditional ECDSA-based attestation services when long-term cryptographic security against quantum attacks is a requirement, or when you need a verifiable append-only Black Box audit trail for autonomous agent actions.

Side effects

Payment not received or insufficient USDC — 402 Payment Required
Invalid or malformed decision input/output content — 400 Bad Request
On-chain anchoring failure — permalink may be absent but local attestation still returned
Signature verification mismatch — client must verify signed_message against public_key offline
Network timeout during L1 anchoring — attestation hash may not be available immediately
Service unavailable — 503 if the FractalAI node is unreachable

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "algorithm": "ml-dsa-65",
    "permalink": "https://fractalai.net.co/attestation/0x…",
    "signature": "BASE64_ML_DSA65",
    "attestation_hash": "0x…"
  }
}

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