# SignalDesk AI Hex Decode

> SignalDesk AI Hex 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 2026-10-09).

Decodes a hex-encoded string back into its original plain text representation

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/encoding/hex-decode?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-09
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-hex-decode-059cc1c3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TkCYWW_sEftByuFLxo3nI

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-hex-decode-059cc1c3 -d '<json body>'
```

Example prompt: Can you decode this hex string for me: '68656c6c6f20776f726c64'? I need to know what the original text says.

## When to prefer this

Choose this endpoint when you have a hex-encoded string and need to recover the original plaintext. It is purpose-built for hex decoding specifically, as opposed to general base64 or URL decoding. Suitable for lightweight, per-call decoding within agent workflows where local decoding libraries are unavailable.

## Known failure modes

- Invalid hex characters in input cause a decoding error
- Odd-length hex string (not byte-aligned) may return an error
- Empty input returns an empty decoded string or error
- Exceeding the 4096-character input limit returns a 400 or rejection
- Non-hex encoded input (e.g. base64 or plain text) returns garbled/incorrect output

## 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 plain text string that results from interpreting the input as a hexadecimal-encoded sequence of bytes.

## 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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-hex-decode-059cc1c3/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)