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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 2026-09-15).
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
Success—
StatusUnknown
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 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-decisionWhen 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 |
|---|---|---|
| input | string | The decision input/prompt. We seal sha256(input) — the raw input is NOT stored. |
| output | string | The decision output the agent produced. We seal sha256(output). |
| agent_id | string | Stable identifier of the AI agent whose decision is being sealed. |
| model_id | string | Model identifier (e.g. "midas-risk-v1"). Optional; defaults to "fane-agent-v1". |
| model_version | string | Model version tag (e.g. "2026-06-20"). Optional. |
Output
Schema · Response
{
"type": "json",
"schema": {
"type": "object",
"required": [
"entry_hash",
"input_hash",
"output_hash",
"signature",
"public_key"
],
"properties": {
"seq": {
"type": "number",
"description": "Append-only sequence number of this decision in the agent Black Box."
},
"payment": {
"type": "object",
"description": "Settlement receipt (scheme, network, asset, txHash, payer, settled)."
},
"algorithm": {
"type": "string",
"description": "ml-dsa-65 (the served signature algorithm)."
},
"permalink": {
"type": "string",
"description": "Permalink to the on-chain Dilithium-2 anchor (VAID-1), when the L1 anchor succeeds."
},
"prev_hash": {
"type": "string",
"description": "Hash of the previous Black Box entry this one is chained to (tamper-evident order)."
},
"signature": {
"type": "string",
"description": "Base64 ML-DSA-65 / Dilithium-3 (NIST FIPS 204) SERVED signature (3309 bytes) over the EXACT bytes echoed in `signed_message` = FRACTALAI-x402-served-v1\\nx402-attest-decision\\n<sha256(canonical decision message)> (route-separated, 3 lines). Verify offline: ml_dsa65.verify(b64(signature), utf8(signed_message), b64(public_key))."
},
"entry_hash": {
"type": "string",
"description": "Black Box entry hash: sha256 of the chained, canonical decision content."
},
"input_hash": {
"type": "string",
"description": "sha256 of the declared input."
},
"public_key": {
"type": "string",
"description": "Base64 ML-DSA-65 public key (1952 bytes) that verifies the served signature."
},
"output_hash": {
"type": "string",
"description": "sha256 of the declared output."
},
"signed_message": {
"type": "string",
"description": "The EXACT UTF-8 bytes the served signature covers (FRACTALAI-x402-served-v1\\nx402-attest-decision\\n<sha256(canonical)>). Pass verbatim to ml_dsa65.verify."
},
"entry_signature": {
"type": "string",
"description": "Base64 Dilithium-2 (NIST FIPS 204) signature over the Black-Box entry hash — the chained on-chain-anchored seal."
},
"attestation_hash": {
"type": "string",
"description": "On-chain (VAID-1) attestation hash — re-verifiable proof the decision was sealed."
},
"entry_public_key": {
"type": "string",
"description": "Base64 Dilithium-2 public key that verifies entry_signature."
}
}
},
"example": {
"algorithm": "ml-dsa-65",
"permalink": "https://fractalai.net.co/attestation/0x…",
"signature": "BASE64_ML_DSA65",
"attestation_hash": "0x…"
}
}Tags
x402
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