# PennyRail URL Decode

> PennyRail URL Decode is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Decodes a percent-encoded (URL-encoded) string back to its original plaintext form

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/f/encoding.url-decode
- 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-url-decode-cdb6a18e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6_o6Rq_7CVfisAkPm6If-

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-url-decode-cdb6a18e -d '<json body>'
```

Example prompt: Can you decode this URL-encoded string for me: 'Hello%20World%21%20This%20is%20a%20test%20%26%20example'?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call microservice to decode percent-encoded (URL-encoded) strings without setting up your own decoding logic. It is ideal for agents processing URL parameters, form data, or encoded API responses on demand. At $0.001 USDC per call it suits low-volume or ad-hoc decoding tasks.

## Known failure modes

- Malformed input that is not valid URL-encoded text may return an error or pass through unchanged
- Empty input string may return an empty result or error
- Non-string input types will fail schema validation
- Sequences like %GG (invalid hex) may cause parsing errors

## How this service works

Machine-readable settlement service

## Output

Returns a JSON object with an 'operation' field (identifying the operation performed) and a 'result' field containing the decoded plaintext string after percent-encoding has been reversed.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "operation",
  "result"
 ],
 "properties": {
  "result": {},
  "operation": {
   "type": "string"
  }
 },
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-url-decode-cdb6a18e/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)