"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP connectors:

Live censorship, China economic, and tamper-evident AI evaluation tools with bounded analysis.

Dedicated static outbound IPv4 over WireGuard. Free 7-day trial, no card, no sales call.

Email posture for any domain: can it receive mail, can it be spoofed? MX, SPF and DMARC.

Live DNS lookups for agents: A/MX/TXT/SPF/CNAME/PTR with TTLs and DNSSEC, via Google Public DNS.

Normalized JSON for any domain across 1,200+ TLDs. The modern WHOIS replacement.

DNS and email security: check SPF, DKIM, DMARC, DNSSEC, DANE and build the records. 45 tools.

Custom domains API for SaaS: connect, verify, and manage customer domains, SSL, and DNS

Monitoring for agencies — uptime, SSL, DNS, blocklists, AI visibility, MCP health. 8 no-auth tools.

Domain reputation over time: Domain Rating, Tranco rank, TLS, and AI crawler policy.

Domain & company intel for AI agents: RDAP, DNS, email deliverability, tech stack. No API keys.

SecurityTrails MCP — wraps SecurityTrails API (securitytrails.com)

AbuseIPDB MCP — wraps AbuseIPDB v2 API (api.abuseipdb.com/api/v2)

Read devices, users, keys, ACLs and DNS for a tailnet; manage devices, routes and auth keys.

Shodan MCP — wraps the full Shodan REST API (api.shodan.io)

The web capability layer for AI agents: render, extract, DNS, SSL, WHOIS & more via x402.

Domain attribution and correlation for AI agents, with confidence and per-signal evidence.

Check email deliverability for a domain: MX, SPF, DKIM, DMARC, blacklists. Graded, no key.

Unlock the power of DNS lookups with our DNS Lookup service using Google DNS-over-HTTPS. Whether

Scan the open TCP ports of your own public IP. Fast (32) or deep (65535). No key, no signup.

What's My IP Address: caller's public IP, ASN, geo, timezone, user-agent, headers, TLS info.