# PennyRail ROT13 Decode

> PennyRail ROT13 Decode 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).

Decodes a ROT13-encoded string back to its original plaintext by applying the ROT13 Caesar cipher substitution in reverse

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/text.rot13--rot13-decode
- 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-rot13-decode-a686e988
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IroXIEg508Zff0QMPYmbW

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-rot13-decode-a686e988 -d '<json body>'
```

Example prompt: Can you decode this ROT13 string for me: 'Uryyb, jbeyq! Guvf vf n frperg zrffntr.'?

## When to prefer this

Use this endpoint when you need a simple, reliable, pay-per-call ROT13 decode operation without managing your own cipher logic. Ideal for agents that need to decode ROT13 text on demand within a micropayment workflow using the x402 protocol. Prefer this over self-implemented ROT13 when operating in an agentic pipeline that already uses PennyRail for billing.

## Known failure modes

- Missing 'input' field in request body returns a validation error
- Empty string input may return an empty string
- Non-string input types may cause a 400 error
- Service unavailability on Vercel infrastructure returns 5xx
- Payment failure via x402 protocol blocks the request before processing

## How this service works

Machine-readable settlement service

## Output

Returns an object containing the decoded plaintext result after applying ROT13 decoding to the input string. The exact response shape is flexible (additionalProperties: true), but the primary value is the transformed plain-text output.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-rot13-decode-a686e988/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)