Free & No API Key Required

Domain Checker API

Check any domain's trust score, SSL certificate, WHOIS data, blacklist status, DNS, and more — completely free, no registration needed.

Base URL

https://trustmonitor.io

GET /api/check?domain={domain}

Run a full domain check. Returns trust score, SSL info, WHOIS data, blacklist status and more. First request may take 10–30 seconds (live check). Subsequent requests return cached results instantly.

Parameters

Parameter	Type	Required	Description
`domain`	string	Yes	Domain to check (e.g. `google.com`)
`refresh`	1\|0	No	Set to `1` to force a fresh check (bypass cache)

Example Request

GET https://trustmonitor.io/api/check?domain=google.com

Example Response

{
  "success": true,
  "domain": "google.com",
  "trust_score": 98,
  "score_grade": "Excellent — Very Trusted",
  "from_cache": true,
  "last_updated": "2025-04-10 12:00:00",
  "ssl": {
    "has_ssl": true,
    "issuer": "Google Trust Services",
    "days_remaining": 72,
    "grade": "A"
  },
  "safety": {
    "is_blacklisted": false,
    "google_safe_browsing": "safe",
    "virustotal_score": 0
  },
  "whois": {
    "registrar": "MarkMonitor Inc.",
    "creation_date": "1997-09-15",
    "expiry_date": "2028-09-14"
  },
  "report_url": "https://trustmonitor.io/check/google.com"
}

GET /api/status/{domain}

Get the cached status of a domain without triggering a full check.

Example Request

GET https://trustmonitor.io/api/status/google.com

Example Response

{
  "domain": "google.com",
  "trust_score": 98,
  "score_grade": "Excellent — Very Trusted",
  "status": "complete",
  "last_updated": "2025-04-10 12:00:00"
}

Rate Limits

Requests are rate-limited per IP address.
Cached results (previously checked domains) are returned immediately with no rate-limit impact.
Live checks (first-time or refresh=1) count toward your rate limit.
If rate limited you will receive a 429 HTTP response.

Error Codes

HTTP Code	Meaning
`200`	Success
`400`	Invalid domain name
`404`	Domain not in cache (use `/api/check` first)
`429`	Rate limit exceeded — try again later
`500`	Server error during check