# x402 Radar Conformance Probe

> x402 Radar Conformance Probe is a paid API for AI agents from configure-flip-childhood-widely.trycloudflare.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-18).

Checks whether a given URL serves a valid x402 payment handshake and returns its price, asset, network, payTo address, and latency.

## Facts

- Endpoint: POST https://configure-flip-childhood-widely.trycloudflare.com/api/check
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-radar-conformance-probe-e66068ea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_t1ceDDSpl6IoW8XBTIZT8

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-radar-conformance-probe-e66068ea -d '<json body>'
```

Example prompt: Before I pay, can you probe https://api.exa.ai/search and tell me if it actually serves a valid x402 handshake, what the price is in USDC, which network it's on, and how fast it responds?

## When to prefer this

Use this endpoint when you need to programmatically verify that a specific URL correctly implements the x402 payment protocol before paying or integrating — especially useful for pre-flight checks in agentic payment flows, building x402 service directories, or debugging 402 handshake issues. Prefer this over manual inspection or generic HTTP probes when you need structured x402-specific metadata like price, payTo address, network, and handshake validity.

## Known failure modes

- Target URL is unreachable — alive: false, latency_ms may be null
- Target returns HTTP 200 or other non-402 status — x402: false, valid_handshake: false
- Malformed 402 response — valid_handshake: false with partial fields populated
- Network timeout causing high latency_ms or probe failure
- Invalid or unsupported asset/network returned by target
- Probe service itself is unavailable (Cloudflare tunnel down)

## How this service works

Live x402 conformance probe: url=<endpoint>, returns whether it serves a valid 402 handshake, actual price/asset/network/payTo, latency. Verify before you pay. By x402 Radar.

## Output

Returns a JSON object indicating whether the URL is alive, whether it serves a valid x402 handshake, the HTTP status returned, the payment scheme, network (e.g. base), asset, payTo address, price in atomic units, price in USD if USDC, x402 version, and the latency in milliseconds.

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "example": {
  "x402": true,
  "alive": true,
  "scheme": "exact",
  "status": 402,
  "checked": "https://api.exa.ai/search",
  "network": "base",
  "latency_ms": 340,
  "valid_handshake": true,
  "price_usd_if_usdc": 0.007
 },
 "properties": {
  "at": {
   "type": "string"
  },
  "x402": {
   "type": "boolean"
  },
  "alive": {
   "type": "boolean"
  },
  "asset": {
   "type": "string"
  },
  "payTo": {
   "type": "string"
  },
  "scheme": {
   "type": "string"
  },
  "status": {
   "type": "number"
  },
  "checked": {
   "type": "string"
  },
  "network": {
   "type": "string"
  },
  "latency_ms": {
   "type": "number"
  },
  "price_atomic": {
   "type": "string"
  },
  "x402_version": {
   "type": "number"
  },
  "valid_handshake": {
   "type": "boolean"
  },
  "price_usd_if_usdc": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-radar-conformance-probe-e66068ea/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from configure-flip-childhood-widely.trycloudflare.com](https://www.zero.xyz/host/configure-flip-childhood-widely.trycloudflare.com/llms.txt)