# Sitesy Site Check

> Sitesy Site Check is a paid API for AI agents from api.sitesy.ca, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).

Checks a domain for HTTPS reachability, HTTP behavior, SSL certificate days remaining, and presence of key security headers

## Facts

- Endpoint: GET https://api.sitesy.ca/v1/site-check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitesy-site-check-e907bed0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oY3xkpsaYrKMWC74upTiN

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 sitesy-site-check-e907bed0
```

Example prompt: Can you do a quick site check on example.com — I want to know if HTTPS is working, how many days are left on the SSL cert, and whether the security headers are in place?

## When to prefer this

Use this endpoint when you need a fast, lightweight check of a single domain's HTTPS health, SSL certificate expiry, and security header presence — ideal for pre-launch audits, vendor assessments, or certificate monitoring workflows. Prefer it over a full website intelligence report when you only need security-oriented surface checks rather than deep content or DNS analysis.

## Known failure modes

- Domain does not exist or cannot be resolved — returns unreachable or DNS failure
- Domain is reachable over HTTP but not HTTPS — certificate data may be absent
- Invalid or malformed domain input — validation error returned
- Request timeout if target server is slow or unresponsive
- Self-signed or expired certificate may result in connection errors rather than cert details

## How this service works

Quick site check: HTTPS reachability, HTTP behaviour, certificate days remaining, and security header presence

## Output

Returns HTTPS reachability status, HTTP response behavior (e.g. redirects, status codes), the number of days remaining on the SSL/TLS certificate, and which security headers (such as HSTS, CSP, X-Frame-Options) are present or absent for the given domain.

## 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": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "A domain name"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitesy-site-check-e907bed0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sitesy.ca](https://www.zero.xyz/host/api.sitesy.ca/llms.txt)