# PennyRail Cryptographic Randomness Generator

> PennyRail Cryptographic Randomness 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 cryptographically secure random values via a paid micro-settlement API endpoint

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/utility.random-secure--cryptographic-randomness
- 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-cryptographic-randomness-generator-67e06682
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iIn2vCguOjL5KtN3CIvLQ

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-cryptographic-randomness-generator-67e06682 -d '<json body>'
```

Example prompt: Give me a cryptographically secure random value — I need something unpredictable for generating a secret token.

## When to prefer this

Choose this endpoint when you need a cryptographically secure random value as a paid, on-demand utility — particularly in agentic workflows where you cannot rely on local CSPRNG libraries or need a verifiable external source of randomness. It is useful when operating in constrained execution environments or when auditable external randomness generation is preferred.

## Known failure modes

- Payment not received or insufficient USDC balance — 402 Payment Required returned
- Malformed input object — 400 Bad Request
- Service unavailable on Vercel infrastructure — 503 or timeout
- Empty or missing input field — validation error

## How this service works

Machine-readable settlement service

## Output

Returns a cryptographically secure random value (e.g. random bytes, number, or token) as a JSON object. The exact shape of the response is flexible (additionalProperties: true), so output format may vary but will contain the generated random data.

## 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-cryptographic-randomness-generator-67e06682/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)