# PennyRail JSON Path GET

> 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 2026-10-22).

Fetches a JSON value at a specified path from a remote resource, payable per-call via x402 micropayment

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/json.get--get-json-path?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-json-path-get-3fdfb217
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VPYy-dzaB2ClBYj60lZHc

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability pennyrail-json-path-get-3fdfb217 -d '<json body>'
```

Example prompt: Can you use PennyRail to fetch the JSON value at a specific path from their resource node — I need to pull out a nested field from the data it returns?

## When to prefer this

Choose this endpoint when you need to extract a specific value from a machine-readable, micropayment-gated JSON resource using path-based access. It is best suited for agents that already know the structure of the target JSON and need a single field or subtree, and are comfortable settling via x402 USDC micropayments at $0.001 per call.

## Known failure modes

- Path not found in the JSON resource — may return empty or null result
- Invalid or malformed input object causes a 400-level error
- Payment failure via x402 protocol results in 402 Payment Required response
- Resource node unavailable or Vercel cold-start timeout
- Overly broad path expression returns unexpectedly large payload

## How this service works

Machine-readable settlement service

## Output

Returns a JSON object containing the value found at the requested path within the remote resource. The response schema is open-ended (additionalProperties: true), meaning the returned shape depends on the data stored at that path.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-json-path-get-3fdfb217/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pennyrail.vercel.app](https://www.zero.xyz/host/pennyrail.vercel.app/llms.txt)