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PennyRail OpenAPI Mock Response Validator
x402
PennyRail OpenAPI Mock Response Validator is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates a JSON request or response payload against an OpenAPI 3.x or Swagger 2.x operation schema, returning a mock or validated response
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a validation result indicating whether the input JSON payload conforms to the specified OpenAPI 3.x or Swagger 2.x operation schema, along with any validation errors and a mock response object where applicable.
Example use cases
Pre-flight API request validation
“Before I send this order payload to the payments API, can you check it against the OpenAPI spec to make sure it's valid JSON and conforms to the schema?”
Mock response for frontend development
“I'm building the frontend and the backend isn't ready yet — can you generate a mock OpenAPI response for the GET /users/{id} operation based on this Swagger 2.x schema?”
CI pipeline schema conformance check
“I want to verify that the response my staging API returned for POST /invoices actually matches what the OpenAPI 3.x spec says the response should look like — can you check it?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/openapi.mock-response--openapi-mock-responseWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call OpenAPI/Swagger schema validation and mock-response service without standing up your own validation infrastructure. Particularly useful in CI/CD pipelines, agent workflows that build or test APIs dynamically, or frontend development where a backend isn't yet available.
Side effects
- Malformed or missing input JSON payload returns a schema validation error
- Unsupported OpenAPI or Swagger version yields an unrecognized schema error
- Payload that does not conform to the operation schema returns a list of constraint violations
- Empty or null input object may return a required field error
- Network or cold-start latency on Vercel may occasionally cause timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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