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PennyRail OpenAPI Search Endpoint
x402
PennyRail OpenAPI Search Endpoint is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).
Searches OpenAPI endpoint metadata within the PennyRail settlement network for discovery and routing purposes
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a loosely-structured JSON object containing matching OpenAPI endpoint records, including descriptions, schemas, pricing, and discovery metadata from the PennyRail registry. The exact shape of the response is flexible (additionalProperties: true).
Example use cases
Discover payment-enabled APIs
“Can you search the PennyRail registry for any endpoints related to stablecoin or USDC payments so I know what APIs I can call with micropayments?”
Find APIs by capability keyword
“Look up OpenAPI endpoints on PennyRail that have anything to do with 'search' or 'data extraction' — I want to see what's indexed there.”
Audit available settlement endpoints
“Pull up all the OpenAPI endpoint listings on PennyRail so I can review which services support x402 machine-readable settlement.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/openapi.search--openapi-endpoint-search?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to discover or search for x402-compatible OpenAPI endpoints within the PennyRail ecosystem. It is best suited for agent-to-agent or meta-discovery workflows where the agent needs to find what APIs are available before calling them. Prefer this over generic web search when looking specifically for machine-readable, settlement-ready APIs indexed in the PennyRail registry.
Side effects
- Missing or malformed 'input' object returns a validation error
- Empty search yields no results or an empty response body
- Overly broad queries may return noisy or unrelated endpoint records
- Payment of $0.001 USDC required per call — unpaid requests will be rejected with HTTP 402
- Network or Vercel cold-start latency may cause occasional timeouts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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