# x402 Web Probe – HTTP Check (Hub Europe, Germany)

> x402 Web Probe – HTTP Check (Hub Europe, Germany) is a paid API for AI agents from superstone.ccwu.cc:8443, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).

Checks website uptime, HTTP status, TLS certificate validity, and response latency from a European (Germany) vantage point, returning structured diagnostics.

## Facts

- Endpoint: GET https://superstone.ccwu.cc:8443/v1/check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-web-probe-http-check-hub-europe-germany-514bdb9b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_B7N3A0J-RNmMrgNhfP_Oi

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-web-probe-http-check-hub-europe-germany-514bdb9b
```

Example prompt: Can you check if https://example.com is up and reachable right now, including whether its TLS certificate is valid and how fast it responds — measured from Germany?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call uptime or latency check from a European (Germany) geographic vantage point with no account or API key required. It is ideal for spot-checking availability, TLS health, or response speed from a European perspective. Prefer it over self-hosted monitoring or subscription services when you need on-demand, ad-hoc checks billed in USDC micro-payments via x402.

## Known failure modes

- URL unreachable or times out — ok: false with no timing data
- Invalid or non-public URL (not http/https, or restricted port) — request rejected
- TLS certificate invalid or expired — authorized: false with days_left near 0 or negative
- Payment failure via x402 — HTTP 402 returned before probe executes
- Non-GET method requested — rejected by schema validation
- Port not 80 or 443 — URL rejected

## How this service works

Pay-per-call website uptime/latency/TLS checks and fetch-to-Markdown, measured from Hub Europe (Germany). USDC on Base via x402. No account or API key.

## Output

Returns a JSON object with: whether the site is reachable (ok: boolean), HTTP status code, resolved IP, TLS details (issuer, days left, authorized), timing breakdown (dns_ms, ttfb_ms, total_ms), the final URL after redirects, the redirect chain, and the probing node/region identifier.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "Public http(s) URL to check (ports 80/443)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "tls": {
       "type": "object"
      },
      "status": {
       "type": "number"
      },
      "timing": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ip": "93.184.215.14",
  "ok": true,
  "tls": {
   "issuer": "DigiCert Inc",
   "days_left": 60,
   "authorized": true
  },
  "url": "https://example.com/",
  "node": "vps13",
  "region": "Hub Europe (Germany)",
  "status": 200,
  "timing": {
   "dns_ms": 3.1,
   "ttfb_ms": 95.2,
   "total_ms": 97.8
  },
  "final_url": "https://example.com/",
  "redirects": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-web-probe-http-check-hub-europe-germany-514bdb9b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from superstone.ccwu.cc:8443](https://www.zero.xyz/host/superstone.ccwu.cc%3A8443/llms.txt)