# x402 Payment Requirements Probe

> x402 Payment Requirements Probe is a paid API for AI agents from well-012-x402-probe.mmelnyk2000.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-16).

Probes a public HTTPS URL to detect x402 payment requirements without paying, returning HTTP status, latency, parsed payment metadata, network info, and minimum price.

## Facts

- Endpoint: POST https://well-012-x402-probe.mmelnyk2000.workers.dev/mcp?utm_source=zero.xyz#x402-probe#x402-probe
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-payment-requirements-probe-6f555ff4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O8bwl2GewWyljjF_da6wD

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-6f555ff4 -d '<json body>'
```

Example prompt: Can you probe https://api.example.com/some-resource to check if it requires x402 payment — I want to know the HTTP status, latency, whether it returns a valid 402 payment-requirements response, what networks it supports, and the minimum price, without actually paying anything?

## When to prefer this

Choose this endpoint when you need to passively discover and inspect x402 payment requirements on a public HTTPS URL without spending any funds. Ideal for API auditing, integration planning, price comparison, and monitoring x402-gated endpoints. Not suitable for actually executing payments or probing non-HTTPS URLs.

## Known failure modes

- Non-HTTPS URLs rejected — endpoint only probes HTTPS targets
- Timeout after ~12 seconds if the target URL is too slow to respond
- Response body exceeds 200KB cap — probe may return truncated or error result
- More than 5 redirects causes probe to abort
- Target URL returns no 402 response — payment-requirements fields will be null/false
- Malformed or non-standard x402 headers result in parse failure flag

## 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, response latency in milliseconds, a boolean indicating whether a 402 payment-requirements header was present and parseable, a list of supported blockchain networks, the minimum price required, and a flag indicating whether the payment schema is valid — all without making any payment.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-payment-requirements-probe-6f555ff4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from well-012-x402-probe.mmelnyk2000.workers.dev](https://www.zero.xyz/host/well-012-x402-probe.mmelnyk2000.workers.dev/llms.txt)