# PennyRail ROT13 Text Encoder

> PennyRail ROT13 Text Encoder 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).

Applies ROT13 Caesar cipher transformation to a given input string, returning the encoded/decoded result

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/text.rot13--rot-13
- 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-text-encoder-c719b6da
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RJvtl0W4WwdTR8OSnrAvf

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-text-encoder-c719b6da -d '<json body>'
```

Example prompt: Can you ROT13-encode this text for me: 'The quick brown fox jumps over the lazy dog'?

## When to prefer this

Choose this endpoint when you need a quick, paid, machine-readable ROT13 transformation as part of an automated pipeline that already uses x402 micropayment infrastructure. It is particularly useful when you want a simple stateless cipher operation without standing up your own encoding logic and are already operating in a crypto-native payment context.

## Known failure modes

- Missing 'input' field returns a validation error
- Non-string input type may cause a 400 or schema error
- Payment failure (402) if USDC balance is insufficient or x402 header is missing
- Empty string input may return an empty result or error
- Network timeout on vercel.app cold start

## How this service works

Machine-readable settlement service

## Output

Returns a JSON object containing the ROT13-transformed version of the input string, where each alphabetic character is shifted 13 positions in the alphabet while non-alphabetic characters remain unchanged.

## 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-text-encoder-c719b6da/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)