# PennyRail Secure Random Number Generator

> PennyRail Secure Random Number Generator is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).

Generates a cryptographically secure random value via a paid API endpoint using the x402 micropayment protocol

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/utility.random-secure--secure-random?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-secure-random-number-generator-7d7fa731
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FqkIrwSyffj3ZwJb0iAfe

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-secure-random-number-generator-7d7fa731 -d '<json body>'
```

Example prompt: Can you generate a cryptographically secure random value for me using PennyRail's paid secure-random utility — I need it for a nonce in a transaction I'm building?

## When to prefer this

Choose this endpoint when you need a cryptographically secure random value from a neutral, paid third-party service — particularly in contexts where auditability or the payment-as-commitment property of x402 micropayments adds trust. Useful in agentic workflows that require an unforgeable random seed, nonce, or lottery draw where the $0.001 USDC cost signals intentionality and deters abuse.

## Known failure modes

- Payment not provided or insufficient — 402 Payment Required response
- Malformed input object — 400 Bad Request
- Service unavailable or cold-start timeout on Vercel deployment — 503 or timeout
- Unexpected response schema variation due to open additionalProperties schema

## How this service works

Machine-readable settlement service

## Output

Returns an object containing a cryptographically secure random value or set of random bytes/numbers, with no fixed schema beyond the envelope (additionalProperties: true), meaning the shape of the random output may vary.

## 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-secure-random-number-generator-7d7fa731/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)