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Delx Commerce — Response Contract Diff
x402
Delx Commerce — Response Contract Diff is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Compares an actual API response object against an expected response schema to identify missing fields, type mismatches, and unexpected fields.
Price / call$0.003
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 a compatibility boolean, list of missing fields, list of type mismatches, list of unexpected fields, the comparison scope (top-level structural comparison), and the schema identifier used (delx/util-response-contract-diff/v1).
Example use cases
Debug broken agent tool response
“My agent's tool call returned a response but something's off — can you diff the actual response against the expected contract and tell me which fields are missing or have the wrong type?”
Validate API integration before deployment
“Before I ship this integration, can you check whether the actual API response matches the expected schema and flag any type mismatches or missing required fields?”
Catch schema drift after upstream update
“The upstream API just released a new version and I want to know if the response format changed — compare the old expected schema against a live response sample and tell me what's different.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/response-contract-diff?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, pay-per-call schema diff with no signup overhead — ideal for AI agents that need to verify API contract compliance on the fly, detect schema drift, or debug response mismatches in real time without setting up a full testing framework.
Side effects
- Missing or malformed 'actual' or 'expected' fields returns a validation error
- Non-object inputs for actual/expected may cause parsing failure
- Payment not fulfilled via x402 returns a 402 Payment Required response
- Deeply nested schemas may only be compared at top-level scope, missing nested mismatches
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| actual | object | Input field: actual. |
| expected | object | Input field: expected. |
Output
Schema · Response
{
"type": "json",
"example": {
"scope": "top-level structural comparison",
"schema": "delx/util-response-contract-diff/v1",
"compatible": false,
"missing_fields": [
"ready"
],
"type_mismatches": [
"id"
],
"unexpected_fields": []
}
}Tags
x402
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