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Delx Commerce X402 Idempotency Check
x402
Delx Commerce X402 Idempotency Check is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Checks whether a payment key and delivery key match, verifying idempotency for X402 pay-per-result transactions without retaining input data.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object indicating whether the payment_key and delivery_key match (matched: true/false), echoes both keys, reports the operation status (pass/fail), and provides an evidence block containing a SHA256 hash of the input, confirmation that no data was retained, and the count of external calls made (always 0). The schema version and operation name are also included.
Example use cases
Prevent double payment for agent job
“I just triggered a pay-per-result API call with payment key 'agent-task-99' and delivery key 'agent-task-99' — can you run an x402 idempotency check on Delx Commerce to make sure this job wasn't already paid and delivered?”
Audit verifiable delivery contract
“Before retrying this Delx Commerce request, check if payment key 'order-7821' and delivery key 'order-7821' match so I know whether the original delivery already went through.”
Validate keys before releasing funds
“I have a payment key 'session-flux-003' and delivery key 'session-flux-003' for an x402 transaction — verify they match and confirm no data was retained before I approve the next payout.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/x402-idempotency-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to cryptographically verify that a payment key and delivery key correspond for an x402 pay-per-result transaction on Delx Commerce, especially when preventing replay attacks or double-processing in an agentic payment workflow. It is the right choice when you need verifiable, in-memory-only key matching with no data retention and an auditable SHA256 evidence trail.
Side effects
- Keys do not match — matched: false returned with status 'fail'
- Missing required fields (payment_key or delivery_key) may result in a validation error
- Malformed input exceeding maxLength of 8192 characters may be rejected
- Network timeout or service unavailability returns no result
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| payment_key | string | Payment Key supplied to X402 Idempotency Check; used only for this bounded calculation and processed in memory without retention. |
| delivery_key | string | Delivery Key supplied to X402 Idempotency Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"matched": true,
"payment_key": "job-42",
"delivery_key": "job-42"
},
"schema": "delx/util-x402-idempotency-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "a9aa562b36a16cb899fdccfd5bcae9beef661bc9955a23c2dab0076b08c36ff5",
"external_calls": 0
},
"operation": "delivery_contract:x402_idempotency_check"
}
}Tags
x402
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