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Nomos Signed Decision Receipt
x402
Nomos Signed Decision Receipt is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $2/call, status unknown (last checked 2026-09-14).
Creates a cryptographically signed, on-chain receipt attesting to an autonomous agent's decision, including risk assessment and evidence references.
Price / call$2
Success—
StatusUnknown
How this service works
Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.
Output
Returns a JSON object containing the Base network identifier (eip155:8453), the product name ('nomos-signed-decision-receipt'), and an assessment object with a risk_score (numeric), risk_level (e.g. 'low'), and a flags array listing any risk signals — all cryptographically signed as an on-chain attestation of the submitted decision and evidence.
Example use cases
Compliance audit trail for agent transfers
“My agent just approved a payment — can you create a signed decision receipt for 'Approved outbound USDC transfer to vendor wallet 0xDEAD' with evidence reference 'invoice-id:INV-2024-88' so I have a verifiable audit record?”
Risk-attested authorization for agent fleet
“Before my agent fleet executes this contract interaction, generate a signed decision receipt for 'Authorized smart contract call on protocol XYZ' referencing evidence 'preflight-check:pass-v2' so I can prove the decision was risk-assessed and recorded.”
Tamper-proof log of declined agent action
“My agent decided to reject a suspicious transfer request — please create a signed receipt for decision 'Declined transfer due to anomalous recipient address' with evidence reference 'risk-flag:high-velocity-alert' so we have an immutable record of why it was blocked.”
Technical details
Endpoint
POSThttps://base-agent-preflight.bytoken2023.workers.dev/x402/v1/evidence/signed-decision-receiptWhen to prefer
Choose this endpoint when you need a cryptographically signed, on-chain attestation of an autonomous agent's decision for audit, compliance, or legal accountability purposes — particularly when you need a risk score and evidence reference bundled into one receipt on the Base network. Prefer this over generic logging when tamper-proof verifiability and blockchain anchoring are required.
Side effects
- Missing or empty 'decision' field returns a validation error
- Missing 'evidence_references' may result in incomplete or rejected receipt
- Payment failure (x402) blocks the call before processing
- Malformed input JSON returns a 400-level error
- Network congestion on Base may delay finality of the signed receipt
- Duplicate submissions are not idempotent — each call produces a new receipt
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| decision | string | |
| evidence_references | string |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "nomos-signed-decision-receipt",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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