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X402 Delivery Hash Check
x402
X402 Delivery Hash Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Verifies delivered text against a caller-supplied SHA-256 digest to accept or reject an x402 agent delivery before payment or acceptance
Price / call$0.001
Success—
StatusUnknown
How this service works
X402 Delivery Hash Check: X402 Delivery Hash Check verifies delivered text against a caller-supplied sha-256 digest from bounded caller-supplied values without an external provider. Call X402 Delivery Hash Check before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Delivery Hash Check as versioned determ…
Output
Returns an explicit accept or reject status for the delivery, contract-specific validation checks, normalized evidence about the hash comparison, and detailed mismatch reasons if the computed SHA-256 of the supplied text does not match the expected digest — all as a versioned deterministic response with no external calls or data retention.
Example use cases
Pre-payment integrity gate for agent results
“Before releasing the x402 payment, verify that this delivered text — 'Here is the summarized research: AI adoption grew 34% in 2024...' — matches the expected hash 'a9f3d2c8b1e047f6...'; give me a clear accept or reject and tell me why if it fails.”
Tamper detection on delivered agent content
“An agent just handed me a document claiming its SHA-256 is '2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824' — can you check the actual text 'hello world' against that hash and confirm whether it was tampered with?”
Automated x402 delivery audit before settlement
“I'm automating delivery acceptance for my agent pipeline — run a hash check on this result text 'Order confirmed: 500 units at $12.50 each' against expected digest 'b94d27b9934d3e08a52e52d7da7dabfac484efe04294e576f432' and tell me if I should accept or reject it with the full mismatch details.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/x402-delivery-hash-checkWhen to prefer
Use this endpoint when you need a deterministic, in-memory, no-retention SHA-256 integrity check on an x402 or agent delivery before paying or accepting — especially when you cannot trust the delivery source and need explicit accept/reject verdicts with mismatch evidence. Prefer this over ad-hoc hashing when you need structured rejection reasons and normalized evidence suitable for audit logs or automated pipeline gates.
Side effects
- Malformed or non-hexadecimal expected_sha256 string returns a validation error
- Text exceeding 8192 characters is rejected with a length constraint error
- Missing required fields (text or expected_sha256) return a 400 bad request
- Hash mismatch returns a rejection status with specific mismatch reasons rather than an error — this is expected behavior
- Extremely large payloads near the limit may add latency
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Text supplied to X402 Delivery Hash Check; used only for this bounded calculation and processed in memory without retention. |
| expected_sha256 | string | Expected Sha256 supplied to X402 Delivery Hash Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"matched": false,
"actual_sha256": "633163569ade0beccda175c1e30d98ad117e7dfb0197ff7889836a9de9d3f823",
"expected_sha256": "7ef67e6a0c33e752d9848702556ca7c63ce63718b2e62b10d1b1d2386e4db0cc"
},
"schema": "delx/util-x402-delivery-hash-check/v1",
"status": "advisory",
"evidence": {
"retained": false,
"input_sha256": "ba733049f9eb88f065a3f19eafada98c9f92d558213695771252332799ffe285",
"external_calls": 0
},
"operation": "delivery_contract:x402_delivery_hash_check"
}
}Tags
x402
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