CAPI2 Momentum Foundry – Integrity Receipt

x402

CAPI2 Momentum Foundry – Integrity Receipt is a paid API for AI agents from capi2-foundry.vandurmedries.workers.dev, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-11).

Hashes a JSON payload and returns a cryptographically signed delivery receipt proving what input was submitted, what result was produced, and that payment was settled via x402.

Price / call$0.006

Seller volume →—

Success—

StatusUnknown

How this service works

Paid agent utilities delivered after verified x402 settlement.

Output

Returns a JSON object containing: a `result` field (the computed output), a `createdAt` timestamp, the `productId`, and a `deliveryReceipt` object with the payer's wallet address, a unique `receiptId` (UUID v4), `deliveredAt` timestamp, `inputSha256` (hash of submitted data), `amountAtomic` (payment in atomic USDC units, e.g. 6000 = $0.006), `resultSha256` (hash of the result), and `signatureSha256` (hash of the combined receipt signature).

Example use cases

Audit trail for AI agent output

“I need a tamper-evident receipt proving my agent produced this exact result — hash this JSON and give me back a signed delivery receipt: {"agentId": "agent-42", "decision": "approve", "confidence": 0.97, "timestamp": "2025-06-01T12:00:00Z"}.”

Data submission proof for compliance

“Generate an integrity receipt for this compliance record so I can prove to an auditor the exact data I submitted and when: {"employeeId": "E-1042", "trainingCompleted": true, "completionDate": "2025-05-15", "courseId": "GDPR-101"}.”

Linking payment to a specific dataset

“I'm sending this dataset to a paid API and need a cryptographic receipt tying my payment to the exact input I submitted — create an integrity receipt for: {"datasetName": "sales_q1_2025", "rowCount": 14203, "checksum": "abc123def456"}.”

Technical details

Endpoint

POSThttps://capi2-foundry.vandurmedries.workers.dev/v1/products/integrity-receipt/run?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a cryptographically verifiable, payment-linked receipt proving the exact JSON payload submitted and result returned — ideal for audit trails, compliance logging, agent accountability, or any workflow where you need tamper-evident proof that a specific input produced a specific output and that a micro-payment was made. Prefer alternatives if you only need a local hash (no payment or delivery proof required) or if your payload exceeds 100,000 characters.

Side effects

Payment not verified — x402 settlement must complete before the endpoint processes the request
Payload too large — input JSON exceeds 100,000 serialized characters, returning a validation error
Malformed JSON input — non-JSON or invalid `data` field causes a 400-level error
Network/worker timeout — Cloudflare Worker may time out under load
Duplicate or replayed payment — stale or reused payment headers may be rejected

Input

Schema · Request body

Field	Type	Description
data	—	JSON value to hash; at most 100000 serialized characters

Output

Schema · Response

{
  "type": "json",
  "example": {
    "result": {},
    "createdAt": "2026-09-23T00:00:00.000Z",
    "productId": "integrity-receipt",
    "deliveryReceipt": {
      "payer": "0x0000000000000000000000000000000000000000",
      "productId": "integrity-receipt",
      "receiptId": "00000000-0000-4000-8000-000000000000",
      "deliveredAt": "2026-09-23T00:00:00.000Z",
      "inputSha256": "example-input-sha256",
      "amountAtomic": "6000",
      "resultSha256": "example-result-sha256",
      "signatureSha256": "example-signature-sha256"
    }
  }
}

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