# PennyRail Base64 Encode

> PennyRail Base64 Encode is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Encodes an input string to Base64 format via a paid API endpoint

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/f/encoding.base64-encode
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-base64-encode-aefbbef5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qx6NFt6ov3ByLpHXynFZu

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-base64-encode-aefbbef5 -d '<json body>'
```

Example prompt: Can you Base64 encode the string 'Hello, World!' for me using PennyRail's encoding service?

## When to prefer this

Use this endpoint when you need a simple, on-demand Base64 encoding operation via a pay-per-call micropayment model (x402/USDC), especially in agent workflows where you want to avoid managing encoding libraries or dependencies, or where you need a verifiable, auditable external encoding step.

## Known failure modes

- Missing required 'input' field returns a validation error
- Non-string input type may cause a 400 bad request
- Payment failure (402) if x402 payment header is missing or insufficient
- Very large input strings may hit size limits or timeout
- Malformed request body returns an error response

## How this service works

Machine-readable settlement service

## Output

Returns a JSON object containing the operation name (e.g. 'base64-encode') and the result field holding the Base64-encoded string representation of the input.

## 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-base64-encode-aefbbef5/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)