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PennyRail JSON Path GET
x402
PennyRail JSON Path GET 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).
Fetches a value from a JSON document by navigating a specified JSON path, delivered as a machine-readable paid endpoint via the x402 micropayment protocol.
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a JSON object containing the value found at the specified JSON path within the input document. The response is open-ended and may include the extracted value in any JSON-compatible format (string, number, object, array, null).
Example use cases
Extract nested config value
“Pull out the value at the path '$.database.host' from this config JSON: {"database":{"host":"db.example.com","port":5432,"name":"prod_db"}}.”
Retrieve API response field
“From this API response JSON, get me the value at '$.data.items[0].title': {"data":{"items":[{"title":"First Result","id":42}]}}.”
Read user profile property
“Given this user profile JSON {"profile":{"email":"jane@example.com","role":"admin"}}, fetch the value at the path '$.profile.role'.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/json.get--json-path-getWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call JSON path extraction over a micropayment rail (x402/USDC), especially in agent workflows where per-query billing is preferable to a subscription. It is well-suited for serverless or agentic pipelines that already handle x402 payments and need to extract specific fields from arbitrary JSON structures on demand.
Side effects
- Invalid or malformed JSON path expression returns an error or empty result
- Input JSON document is missing or malformed, causing a parse failure
- Path does not exist in the document, returning null or an empty response
- Payment not processed (x402 payment required error) if micropayment header is missing
- Overly broad input schema means type mismatches may cause silent failures
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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