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
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
security_check_ssl | POST | /api/check | $0.005 | Check 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
| Name | Type | Required | Description |
|---|---|---|---|
domain | string | yes | Domain 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.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT