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SSL Checker API

Official registry Other

SSL certificate check — validity, expiry, issuer, chain, grade. x402 micropayment.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (sse)
Claude Code 
claude mcp add --transport sse ssl-checker-api 'https://ssl-checker.api.klymax402.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "ssl-checker-api": {
            "type": "sse",
            "url": "https://ssl-checker.api.klymax402.com/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. SSL Checker API
  2. Quickstart -- MCP
  3. Quickstart -- HTTP (x402)
  4. Tools
  5. Example agent prompts
  6. Payment
  7. Part of klymax402
  8. License

SSL Checker API

Check SSL/TLS certificate validity, expiry, issuer, chain details, and security grade for any domain. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "ssl-checker": {
      "url": "https://ssl-checker.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://ssl-checker.api.klymax402.com/api/check" \
  -H "Content-Type: application/json" \
  -d '{"domain":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

ToolMethodPathPriceDescription
security_check_sslPOST/api/check$0.005Check SSL certificate for a domain
security_check_ssl

Use this when you need to check if a domain's SSL/TLS certificate is valid, when it expires, and who issued it. Returns structured certificate data in JSON.

Parameters

NameTypeRequiredDescription
domainstringyesDomain name to check SSL certificate (e.g. example.com)

Example response:

{"domain":"example.com","valid":true,"expiryDate":"2026-12-15","daysRemaining":245,"issuer":{"name":"DigiCert","organization":"DigiCert Inc"},"protocol":"TLSv1.3","securityGrade":"A+"}

When to use: deploying a website, FOR monitoring certificate expiration, auditing security posture, and validating HTTPS setup.

Not for: DNS lookup (use network_lookup_dns), HTTP headers analysis (use network_analyze_headers), port scanning (use network_scan_ports).

Example agent prompts

  • "Check if a domain's SSL/TLS certificate is valid, when it expires, and who issued it"

Payment

  • Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
  • Network: Base L2 (eip155:8453)
  • Asset: USDC
  • Facilitator: Coinbase CDP (primary), PayAI (fallback)
  • Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

License

MIT

Frequently asked questions

What is SSL Checker API?

SSL certificate check — validity, expiry, issuer, chain, grade. x402 micropayment.

How do I install SSL Checker API?

It runs as a remote server. In Claude Code: claude mcp add --transport sse ssl-checker-api 'https://ssl-checker.api.klymax402.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does SSL Checker API need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is SSL Checker API open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains SSL Checker API?

It is published by Br0ski777. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.