"Y Combinator" matching MCP connectors:

Free CVE lookup, dependency vulnerability checks, and CVE updates. No signup or API key.

URL Scanner Online by Aprensec — URL & Domain Security ScannerA

online.urlscanner.mcp

Scan any URL, domain, or IP address for security threats using URLScanner.online. Returns a full security report including: Threat verdict (safe / suspicious / malicious) and 0–100 security score Threat intelligence across 70+ feeds (malware, phishing, blocklists) SSL certificate validity, expiry, issuer, and OCSP status HTTP security headers audit (missing / misconfigured) DNS records (A, AAAA, MX, TXT, NS, SOA) And More! Free to use. No account required. 10 scans/day

AI code security audits via x402 USDC: $0.01 scans, $0.50 audits, $5 auto-fixes. SAST/SCA.

Security research: MCP registries verify identity, not tool behavior. See gtfo.dev.

Five free MCP tools, including proof-before-payment preview, plus one authorized x402 pack.