# ONE Engine Hex Decode

> ONE Engine Hex Decode is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Decodes a hexadecimal string into its plain text representation

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v1/hex/decode?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-hex-decode-bd36ac35
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SZoG3WYZMXzwGfY32FGgl

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 one-engine-hex-decode-bd36ac35 -d '<json body>'
```

Example prompt: Can you decode this hex string for me — 4f4e45 — and tell me what text it represents?

## When to prefer this

Use this endpoint when you need a simple, cheap ($0.001 USDC), on-demand hex-to-text decode operation within an autonomous agent workflow that already uses x402 on Base for payments. Prefer it when you need a utility decode step without standing up your own infrastructure.

## Known failure modes

- Invalid hex string (odd-length or non-hex characters) may return an error or unexpected output
- Empty hex input may return an empty string or error
- Hex representing non-UTF8 bytes may produce garbled or unreadable text
- Network or worker errors may return HTTP 5xx
- Payment failure via x402 may result in HTTP 402 response blocking access

## How this service works

Low-cost pay-per-call utility APIs for autonomous agents using x402 on Base.

## Output

A JSON object containing a 'text' field with the decoded plaintext string corresponding to the input hexadecimal value (e.g. {"text":"ONE"})

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "hex": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "text": "ONE"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-hex-decode-bd36ac35/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from one-search.one-engine.workers.dev](https://www.zero.xyz/host/one-search.one-engine.workers.dev/llms.txt)