Developer interface
SSL Checker API
Inspect SSL certificates, validity, and TLS support for any domain.
The Velohost SSL Checker API provides a programmatic way to inspect SSL/TLS certificates for any domain.
It validates certificate chains, checks expiry dates, and detects supported TLS protocol versions.
Base API URL
All endpoints listed below are relative to this base URL.
https://api.velohost.co.uk/ssl-checker/ Rate limiting
This API is protected by a global rate limit to ensure fair usage and platform stability.
- Limit: 30 requests per 10 seconds per IP address
- Burst traffic is allowed
- No authentication required
-
Requests exceeding the limit return
HTTP 429
This limit applies across all Velohost public APIs.
Error responses
The API uses standard HTTP status codes to indicate errors.
Returned when the global rate limit is exceeded.
{
"detail": "Rate limit exceeded"
}
Returned when the domain parameter is missing or invalid.
Endpoints
Check SSL certificate
Performs a live TLS handshake with the target domain and returns certificate details, validity status, and supported TLS versions.
GET /lookup?domain=example.com
{
"domain": "example.com",
"has_ssl": true,
"issuer": "countryName=US, organizationName=SSL Corporation, commonName=Cloudflare TLS Issuing ECC CA 3",
"subject": "commonName=example.com",
"valid_from": "2025-12-16T19:39:32+00:00",
"valid_to": "2026-03-16T18:32:44+00:00",
"days_remaining": 77,
"is_expired": false,
"is_self_signed": false,
"supports_tls_1_3": true,
"supports_tls_1_2": true,
"chain_valid": true,
"source": "openssl"
} Learn more
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