# x402 Payment Requirements Probe

> x402 Payment Requirements Probe is a paid API for AI agents from well-012-x402-probe.rainmaker-wells.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-28).

Probes a public HTTPS URL to detect x402 payment requirements, returning HTTP status, latency, payment networks, minimum price, and schema validity without ever making a payment.

## Facts

- Endpoint: POST https://well-012-x402-probe.rainmaker-wells.workers.dev/mcp?utm_source=zero.xyz#x402-probe#x402-probe
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-payment-requirements-probe-0a1710f5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_p-4mgGdbkjPRT9Uu0uSzc

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 x402-payment-requirements-probe-0a1710f5 -d '<json body>'
```

Example prompt: Can you probe https://api.example.com/data to check if it has x402 payment requirements — tell me whether it returns a 402, what payment networks it accepts, and what the minimum price is, without actually paying anything?

## When to prefer this

Use this endpoint when you need to safely inspect whether a URL is x402-gated without triggering a payment, or when you want to programmatically discover payment network support and minimum pricing before deciding whether to pay. Ideal for API integration planning, x402 schema validation, and cost-comparison workflows across multiple x402-enabled services.

## Known failure modes

- Non-HTTPS URLs rejected outright
- Timeouts if the target URL takes longer than ~12 seconds
- Response body truncated if target exceeds 200KB
- Redirect loops or chains longer than 5 hops fail
- Target URL may return 402 without a valid payment-requirements schema, reported as schema invalid
- Network errors or DNS failures return error status with no payment data

## How this service works

Unpaid probe of a public https URL for x402 payment requirements ($0.005 USDC). Never pays. Returns HTTP status, latency, whether 402/payment-requirements parse, networks, min price, schema flag. https only; caps ~12s, 200KB, 5 redirects. Factual only; as is, no guarantee. Not a rating or certification.

## Output

Returns HTTP status code, round-trip latency, whether the URL responded with a 402 and a parseable payment-requirements header, list of accepted payment networks, minimum price, and a flag indicating schema validity. Does not attempt payment. Capped at ~12 seconds, 200KB response, and 5 redirects.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-payment-requirements-probe-0a1710f5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from well-012-x402-probe.rainmaker-wells.workers.dev](https://www.zero.xyz/host/well-012-x402-probe.rainmaker-wells.workers.dev/llms.txt)