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Delx Commerce — HTTP Method Idempotency Classifier
x402
Delx Commerce — HTTP Method Idempotency Classifier 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).
Classifies an HTTP method string as idempotent or non-idempotent and safe or unsafe, with cryptographic evidence of no data retention.
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 with: whether the method is safe (boolean), whether it is idempotent (boolean), the method name echoed back, the operation schema identifier, a pass/fail status, and cryptographic evidence including an SHA-256 hash of the input and confirmation that no external calls were made and no data was retained.
Example use cases
Retry logic safety check
“Before I add automatic retries to my HTTP client, can you tell me whether PUT is idempotent and safe to retry without side effects?”
API design validation
“I'm designing a REST API and want to make sure I'm using PATCH correctly — is it idempotent or not? Can you classify it for me?”
Debugging failed request handling
“My app is deciding whether to replay a failed DELETE request — can you check if DELETE is idempotent so I know it's safe to resend?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/method-idempotency-classify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a deterministic, verifiable, pay-per-call classification of HTTP method idempotency with cryptographic proof of no data retention — particularly useful in agent pipelines that need auditable, stateless utility calls without signing up for a service. Prefer over a static lookup table when you need the evidence payload (input hash, external call count) for compliance or logging purposes.
Side effects
- Missing or empty 'method' field returns a validation error
- Malformed JSON body returns a 400-level error
- Unrecognized or non-standard HTTP method strings may return safe:false and idempotent:false as a conservative default
- Payment not received or insufficient USDC balance blocks the call via x402 protocol
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| method | string | Method supplied to Method Idempotency Classify; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"safe": false,
"method": "PUT",
"idempotent": true
},
"schema": "delx/util-method-idempotency-classify/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "c8f1d9636636150613283c76e75ed08a7999d0390f4e3478ee82fa118fcaef20",
"external_calls": 0
},
"operation": "web_reliability:method_idempotency_classify"
}
}Tags
x402
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