The request is for an HTTPS certificate checker. Several products check certificate validity, expiry, issuer and chain: Klymax402 offers an SSL/TLS validity and expiry check 5, TLS Radar runs a free SSL scan returning certificate details 2, and Apixies provides an SSL inspection endpoint 9. testssl.sh is a free command-line tool for checking TLS/SSL servers 6.
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TLS Radartlsradar.comfound in code, not yet checked
Runs a free, anonymous SSL/TLS scan against a hostname and returns certificate details, via its scan_domain action and MCP server 2.
official:MCP server · TLS Radar
for agents: scan_domain · check_certificate_propagation · get_certificate_status
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Apixiesapixies.iowebsite read, tools not yet checked
Offers an SSL inspection API endpoint (inspect-ssl) that returns certificate details for a domain, usable in the browser or through its REST API 9.
official:MCP server · Apixies Developer API Suite+1 community tools built for it
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Sources
- 2TLS Radar - SSL/TLS Certificate Monitoringtlsradar.com · read 2026-10-29
- 5Klymax402klymax402.com ·
- 6testssl(1)testssl.sh · read 2026-10-29
- 9Apixies - Free Developer Tools & APIs Onlineapixies.io · read 2026-10-29
For agents: the 10 actions behind this answer
mx_tool_box_https_information_lookup · mcp-security found in code, not yet checked
The HTTPS Lookup and SSL Certificate Checker will query a website URL and tell you if it responds securely with SSL encryption
scan_domain · tls-radar found in code, not yet checked
Run a free, anonymous SSL/TLS scan against a hostname and return certificate details. No account required.
checker · typing verified and signed
· Ssllabs website read, tools not yet checked
Bringing you the best SSL/TLS and PKI testing tools and documentation.
ssl-checker · ssl-checker found in code, not yet checked
Check SSL/TLS certificate validity, expiry, issuer, chain details, and security grade for any domain.
· testssl(1) website read, tools not yet checked
· Cejel website read, tools not yet checked
Cejel checks a codebase and hands you a certificate anyone can re-run. Your vendor, your customer and your auditor run the same command and get the same answer.
check_ssl · Uptimeify verified and signed
Fetches and evaluates a host's TLS certificate over a live handshake: subject, issuer, validity window, days until expiry, hostname match, chain trust, self-signed and expired flags, SANs, serial and SHA-256 fingerprint. Takes a hostname (not an IP address) and an optional port (default 443). A sing
· Apixies website read, tools not yet checked
Free online developer tools: SSL checker, DNS lookup, JSON converter, regex tester, and more. Use in browser or automate via REST API. No signup needed.
· mitmproxy website read, tools not yet checked
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.