# x402 Radar Conformance Probe

> x402 Radar Conformance Probe is a paid API for AI agents from barry-placement-calling-showers.trycloudflare.com, paid per call via x402, $0.002/call, status down (last checked 2026-10-13).

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://barry-placement-calling-showers.trycloudflare.com/api/check?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-radar-conformance-probe-9f3d6c00
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1Hg6txxlp7IW0gVCgK6RD

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-9f3d6c00 -d '<json body>'
```

Example prompt: Before we pay anything, can you probe https://api.exa.ai/search and confirm it's a valid x402 endpoint — show me the price, network, payTo address, and how fast it responds?

## When to prefer this

Use this endpoint when you need to verify that a specific URL is a legitimate, live x402 service before committing a payment — especially useful for new or untrusted service listings. Prefer this over trusting marketplace metadata alone when the payment amount is non-trivial, the service is newly listed, or your agent needs to extract the exact payTo address, network, and price programmatically before constructing a payment.

## Known failure modes

- Target URL is unreachable — alive=false, no payment details returned
- Target URL does not return HTTP 402 — x402=false, valid_handshake=false
- Malformed or non-conformant 402 response — valid_handshake=false with partial fields
- Network or asset fields missing from the handshake — incomplete result object
- Probe itself times out — latency_ms may be absent or very high

## 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 target URL is alive, whether it serves a valid x402 handshake, the HTTP status code returned, the payment scheme (e.g. 'exact'), the blockchain network (e.g. 'base'), the asset type, the payTo wallet address, the price in atomic units and USD (if USDC), the x402 protocol version, and the probe 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-9f3d6c00/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from barry-placement-calling-showers.trycloudflare.com](https://www.zero.xyz/host/barry-placement-calling-showers.trycloudflare.com/llms.txt)