# BusterCall Echo Utility

> BusterCall Echo Utility is a paid API for AI agents from lookup.bustercall.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Returns an exact echo of the incoming HTTP request body and headers for testing and debugging purposes.

## Facts

- Endpoint: POST https://lookup.bustercall.workers.dev/util/echo
- 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/lookup-bustercall-workers-dev-762b6a14
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qZzTvHF22rhPpgOL_0C7S

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 lookup-bustercall-workers-dev-762b6a14 -d '<json body>'
```

Example prompt: Send a test POST request with this JSON body to the BusterCall echo endpoint and show me exactly what comes back — I want to verify my headers and payload are structured correctly before hitting the real API.

## When to prefer this

Use this endpoint when you need to verify that your HTTP client, headers, authentication tokens, or request payload are being constructed and transmitted correctly before calling a more expensive or stateful endpoint. It is ideal for debugging x402 payment headers or validating JSON serialization in an agent pipeline.

## Known failure modes

- Payment failure (402): x402 micropayment not included or invalid, request rejected
- Malformed body: if body cannot be parsed, echo may return raw bytes or error
- Timeout: Cloudflare Worker timeout if request takes too long
- Empty response: if request body is empty, echo returns empty or minimal response

## How this service works

Returns an echo of the request for simple HTTP testing and debugging.

## Output

Returns a JSON object echoing back the full incoming request including the request body, headers, HTTP method, and any query parameters — useful for confirming exactly what was sent to the server.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/lookup-bustercall-workers-dev-762b6a14/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from lookup.bustercall.workers.dev](https://www.zero.xyz/host/lookup.bustercall.workers.dev/llms.txt)