# x402 Web Probe – US Central (St. Louis)

> x402 Web Probe – US Central (St. Louis) is a paid API for AI agents from rockndefi.xyz: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 latency from US Central (St. Louis), returning structured JSON results; pay-per-call via USDC on Base.

## Facts

- Endpoint: GET https://rockndefi.xyz: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-us-central-st-louis-90915683
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_otnl0DqlMIk9cMVnYZa5r

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-us-central-st-louis-90915683
```

Example prompt: Can you check if https://example.com is up right now from US Central — I want to know the HTTP status, how fast it responds, and whether the TLS cert is still valid?

## When to prefer this

Choose this endpoint when you need a lightweight, no-account pay-per-call HTTP probe from the US Central (St. Louis) geographic vantage point, especially for uptime checks, TLS certificate inspection, redirect tracing, or latency measurement without needing a full monitoring subscription. Ideal for one-off spot checks or agent-driven infrastructure validation where setting up an account with traditional monitoring services is impractical.

## Known failure modes

- URL is unreachable or DNS fails — ok:false with no status or timing
- Target URL uses a non-standard port (not 80/443) — rejected by schema validation
- TLS certificate is invalid or expired — authorized:false in tls object
- Request times out — may return partial timing data or error
- Payment via x402/USDC fails — request not processed, HTTP 402 response
- Non-HTTP URL (e.g. ftp://) provided — rejected by type:http constraint

## How this service works

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

## Output

Returns a JSON object containing: whether the request succeeded (ok), HTTP status code, resolved IP address, TLS details (issuer, days_left, authorized), timing breakdown (dns_ms, ttfb_ms, total_ms), final URL after redirects, list of any redirects, and the probe 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": "vps2",
  "region": "US Central (St. Louis)",
  "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-us-central-st-louis-90915683/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rockndefi.xyz:8443](https://www.zero.xyz/host/rockndefi.xyz%3A8443/llms.txt)