# SignalDesk AI Base64URL Decode

> SignalDesk AI Base64URL Decode is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).

Decodes a Base64URL-encoded string into its original plaintext representation

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/encoding/base64url-decode?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-base64url-decode-4c51e57a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZYYa35TfqXigYVoE3IzxO

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 signaldesk-ai-base64url-decode-4c51e57a -d '<json body>'
```

Example prompt: Can you decode this Base64URL string for me: 'SGVsbG8gV29ybGQ'? I need to see what the original text says.

## When to prefer this

Choose this endpoint when you need a quick, pay-per-use Base64URL decode operation without setting up local tooling, particularly within an agentic workflow that already uses x402 micropayment infrastructure. Ideal when decoding JWT segments, URL-safe tokens, or API response payloads in a serverless pipeline.

## Known failure modes

- Invalid Base64URL input (non-base64url characters) may return an error or garbled output
- Input exceeds 4096 character limit returns a validation error
- Empty string input may return an empty decoded result
- Malformed padding in the encoded string may cause decoding failure
- Network or worker quota exhaustion may result in a 402 or 5xx response

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

Returns a JSON object with a 'decoded' field containing the original plaintext string that was encoded in Base64URL format, e.g. {"decoded": "Hello world"}.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "maxLength": 4096,
   "description": "Text to process."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "decoded": "Hello world"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-base64url-decode-4c51e57a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)