# x402check Health Probe

> x402check Health Probe is a paid API for AI agents from x402check.anton-14a.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-19).

Probes a target x402 endpoint without paying and returns a trust/health verdict about whether it is responsive and well-formed.

## Facts

- Endpoint: POST https://x402check.anton-14a.workers.dev/check?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402check-health-probe-74742478
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ol2DOZs8e3jRjxsXRUz_V

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 x402check-health-probe-74742478 -d '<json body>'
```

Example prompt: Before I commit to calling that x402 payment endpoint, can you do a trust and health probe on it — just hit it unpaid and tell me whether it looks legitimate and well-formed?

## When to prefer this

Use this endpoint when you need to verify an x402 endpoint's health, trust, or conformance before committing a payment — especially when vetting unknown or third-party x402 APIs. Prefer this over calling the endpoint directly when you want a zero-cost pre-flight check.

## Known failure modes

- Target endpoint is unreachable or times out — probe returns unhealthy verdict
- Target URL is not an x402 endpoint — may return malformed or unexpected response verdict
- Invalid or missing target URL in request body — returns validation error
- Target endpoint returns an unexpected non-402 status — flagged in verdict

## How this service works

x402 pre-pay trust/health check: probes another x402 endpoint (unpaid) and returns a verdict.

## Output

A verdict object indicating whether the probed x402 endpoint is healthy, trustworthy, and well-formed — including the response status and any diagnostic signals gathered from the unpaid probe request.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402check-health-probe-74742478/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402check.anton-14a.workers.dev](https://www.zero.xyz/host/x402check.anton-14a.workers.dev/llms.txt)