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PennyRail OpenAPI Search
x402
PennyRail OpenAPI Search 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 across OpenAPI specifications to find matching operations or endpoints given a query input
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a JSON object containing matched OpenAPI operations, endpoint paths, methods, descriptions, and schema details relevant to the search input query.
Example use cases
Discover endpoints for a capability
“Search the OpenAPI catalog for any endpoints related to 'user authentication' — I want to see what operations are available and their paths.”
Find API operations by task description
“Can you query the OpenAPI search to find any operations matching 'retrieve invoice by ID'? I need the matching paths and their HTTP methods.”
Agent capability discovery at runtime
“Search for OpenAPI operations that handle 'payment processing' so my agent knows which endpoints to call when it needs to initiate a transaction.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/openapi.search--openapi-search?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an agent needs to dynamically discover which API operations are available for a given capability or task description at runtime, especially within the PennyRail ecosystem. Prefer it over static documentation lookups when you need machine-readable, structured OpenAPI operation details returned programmatically.
Side effects
- Missing or malformed 'input' object returns a validation error
- No matching OpenAPI operations found returns empty results
- Overly broad queries may return too many low-relevance matches
- Payment failure (402) if USDC balance is insufficient before the call proceeds
- Timeout if the underlying OpenAPI index is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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