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PennyRail OpenAPI Payload Validator
x402
PennyRail OpenAPI Payload Validator is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Validates a JSON request or response body against an OpenAPI 3.x/Swagger 2.x operation schema using deterministic JSON-Schema rules, with no external calls.
Price / call$0.001
Success—
StatusUnknown
How this service works
Validate a JSON request or response payload against one OpenAPI 3.x / Swagger 2.x operation schema. Supports deterministic JSON-Schema validation rules without external calls. Exact-match PennyRail gap-arbitrage route.
Output
Returns a structured validation result indicating whether the submitted JSON body passes or fails against the specified OpenAPI/Swagger schema, including details of any schema violations or constraint mismatches found during deterministic JSON-Schema evaluation.
Example use cases
CI pipeline API contract check
“Before we deploy, can you validate this JSON request payload against our OpenAPI 3.1 operation schema to make sure it conforms — it's a POST with a JSON body and I need a deterministic pass or fail?”
Debugging malformed API response
“I'm getting unexpected errors — can you check whether this JSON response body actually matches our Swagger 2.x schema for this POST endpoint and tell me exactly which fields are invalid?”
Agent self-validating outbound calls
“Before I send this API call, validate my JSON request body against the OpenAPI 3.x spec I have — it's a POST with a JSON body type and I want to catch any schema violations before they hit the server.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/bazaar/openapi-validateWhen to prefer
Choose this endpoint when you need fast, deterministic, self-contained JSON-Schema validation against an OpenAPI 3.x or Swagger 2.x spec without any external HTTP calls or network dependencies. Ideal for CI pipelines, agent pre-flight checks before issuing API calls, or any scenario requiring offline, reproducible schema conformance testing at very low cost ($0.001 per call).
Side effects
- Invalid or malformed OpenAPI schema provided — returns schema parse error
- Body type mismatch (e.g. sending binary as JSON) — returns type error
- Missing required fields in the input object — returns 400 bad request
- Unsupported OpenAPI version — returns unsupported version error
- Malformed JSON body that cannot be parsed — returns parse failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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