# 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 2026-09-15).

Encodes a given input string using the ROT13 Caesar cipher substitution, shifting each alphabetic character by 13 positions

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/text.rot13--rot13-encode
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-rot13-text-encoder-e9cdd496
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NwUFAKjD8nKWOc_JLPBkW

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-e9cdd496 -d '<json body>'
```

Example prompt: Can you ROT13-encode this text for me: 'Hello World, this is a secret message'?

## When to prefer this

Use this endpoint when you need a lightweight, pay-per-call ROT13 encoding operation without managing your own cipher logic. Ideal for agents that need on-demand text obfuscation as part of a larger workflow, especially in x402 micropayment-enabled pipelines where per-call billing is acceptable.

## Known failure modes

- Missing 'input' field returns a validation error
- Empty string input may return an empty encoded string
- Non-string input types may cause a type error
- Service unavailability or payment failure returns a 402 or 5xx error

## How this service works

Machine-readable settlement service

## Output

Returns a JSON object containing the ROT13-encoded version of the input string, where each alphabetic character has been 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-e9cdd496/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)