# SignalDesk AI Hex Encoder

> SignalDesk AI Hex Encoder 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).

Encodes arbitrary text into its hexadecimal (hex) representation

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/encoding/hex-encode?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-hex-encoder-375fd62f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_K_61wblZUVeBW4Vtoq3dT

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-encoder-375fd62f -d '<json body>'
```

Example prompt: Can you hex-encode this string for me: 'hello world'?

## When to prefer this

Use this endpoint when you need a simple, paid, API-accessible hex encoding of a text string without setting up local libraries — particularly useful inside agent workflows running on x402-compatible payment rails where local code execution is not available.

## Known failure modes

- Input text exceeds 4096 character limit — request rejected
- Empty or missing 'text' field — returns error
- Payment not provided or insufficient USDC — 402 Payment Required
- Service unavailable due to Cloudflare Worker limits or quota exhaustion
- Invalid JSON body — parsing error returned

## 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 containing an 'encoded' field with the lowercase hexadecimal string representation of the input text. For example, input 'hello' returns {"encoded": "68656c6c6f"}.

## 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": {
  "encoded": "68656c6c6f"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-hex-encoder-375fd62f/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)