# PennyRail Mock OpenAPI Settlement Node

> PennyRail Mock OpenAPI Settlement Node is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status down (last checked 2026-10-22).

Returns a mock/sample OpenAPI response for a nano-payment-gated settlement resource endpoint on PennyRail

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/openapi.mock-response--openapi-sample-response?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-mock-openapi-settlement-node-9641b7f4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_b1qGAsA9oWPWd14vqSkAS

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-mock-openapi-settlement-node-9641b7f4 -d '<json body>'
```

Example prompt: Call the PennyRail nano settlement node with my input payload and give me back the mock OpenAPI sample response — it costs 0.001 USDC per call via x402.

## When to prefer this

Choose this endpoint when you need to test or prototype an x402 micropayment flow against a live but mock-response endpoint, or when you want to verify your agent's ability to handle 402-gated APIs without a real data dependency. Not suitable for production data retrieval or real settlement operations.

## Known failure modes

- Payment not included or invalid x402 header — returns 402 Payment Required
- Malformed input object — returns 400 Bad Request
- Service unavailable on Vercel deployment — returns 503 or timeout
- Missing required 'input' field — schema validation failure
- USDC balance insufficient to cover 0.001 USDC fee — payment rejected

## How this service works

Machine-readable settlement service

## Output

Returns an unstructured JSON object that serves as a mock/sample OpenAPI response — the exact fields vary but represent a placeholder settlement confirmation or resource payload gated behind a 0.001 USDC x402 micropayment.

## 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-mock-openapi-settlement-node-9641b7f4/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)