Issue a deterministic integrity receipt API
Hash a caller-supplied evaluation and payload, repeat the caller-supplied timestamp, and score whether the declared fields and optional payload checksum are present. The same input always produces the same hash. The receipt is not a signature.
The Issue a deterministic integrity receipt operation is part of the Audit Receipt Hash API on BRAINIAC.software. Hash a caller-supplied evaluation and payload, repeat the caller-supplied timestamp, and score whether the declared fields and optional payload checksum are present. The same input always produces the same hash. The receipt is not a signature. It is exposed as POST /api/v1/audit/integrity-receipt and priced at $0.04 USDC on Base. Payment uses the x402 exact scheme: an unpaid call returns HTTP 402 with payment requirements; after paying the exact USDC amount, retry the same request with a payment-signature header and Idempotency-Key. No account and no API key are required. Data sources for this product: The exact inputs, findings, and source revision provided in the request. Limitations: Receipts are stateless and unsigned; they are not BRAINIAC.software attestations or legal evidence of source accuracy. Verification requires retaining the exact original payload and issue timestamp. integrity-receipt repeats the caller-supplied timestamp. It does not use the clock and it does not sign the hash. Outputs are compliance prechecks, drafts, or data lookups for human review. They are not official determinations, legal advice, identity confirmation, or certified filings. Related operations in this group include Create a hash-based audit receipt. Open the group documentation for the full request schema, field notes, and response examples before integrating.
/api/v1/audit/integrity-receiptExample request
curl -i -X POST "https://www.brainiac.software/api/v1/audit/integrity-receipt" \
-H 'content-type: application/json' \
-H 'Idempotency-Key: <fresh-64-character-random-hex-key>' \
--data-binary @- <<'JSON'
{
"evaluated_at": "2026-04-10T15:04:00Z",
"evaluation": {
"subject": "certificate GL-2041",
"operation": "coi.coverage-grade",
"result": "review",
"declared_fields": [
"insured",
"general_liability",
"expires_on"
]
},
"payload": {
"insured": "North Pier Contracting",
"general_liability": 1000000,
"note": "expires_on was not on the certificate"
},
"payload_sha256": "aaacec99a4b1773d0f33849767889a400d1c22c2633bd2c4d3912071a40f2d79"
}
JSONAn unpaid probe returns HTTP 402 with x402 payment requirements. After paying the exact USDC amount on Base, retry the identical request with a payment-signature header.
FAQ
- Do I need an API key? No. Pay the listed USDC amount with x402.
- What network? Base (eip155:8453), USDC.
- Is this an official determination? No. Results are for human review against the cited sources.
Related operations
- Create a hash-based audit receipt — $0.01 USDC