# PennyRail UUID Generator

> PennyRail UUID Generator 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).

Generates a proven universally unique identifier (UUID) on-demand via a paid micro-transaction API

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/utility.uuid-generate--proven-uuid
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-uuid-generator-d00f7242
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mJaLGCsZCe8FBNTCN-4dI

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-uuid-generator-d00f7242 -d '<json body>'
```

Example prompt: Generate a new proven UUID for me — I need a unique identifier to assign to a new record in my system.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-use UUID generation service without setting up your own infrastructure, particularly in agentic or micro-service pipelines that already use x402 payment rails. It is well-suited for low-volume, on-demand unique ID generation where spinning up a dedicated service is overkill.

## Known failure modes

- Payment not provided or invalid — 402 Payment Required returned
- Malformed input object — may return 400 Bad Request
- Service unavailable or Vercel cold-start timeout — 503 or timeout error
- Rate limiting or quota exceeded — may return 429

## How this service works

Machine-readable settlement service

## Output

Returns a generated UUID string as a proven unique identifier, wrapped in a JSON response object. The exact shape of the response may vary but will contain the UUID value.

## 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-uuid-generator-d00f7242/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)