"Free APIs and services without commercial fees" matching MCP connectors:
Matching Connector Tools:
Domain attribution and correlation for AI agents, with confidence and per-signal evidence.
DNS and email security scanner with 80 MCP tools for SPF, DMARC, DNSSEC, SSL, and brand audits.
Internet censorship and website reachability: OONI network measurements, keyless
Validate Meta-ExternalAgent and Meta-WebIndexer IP addresses. Remote MCP validate_ip tool.
Vendor status pages, TLS cert inspection, DNS propagation checks, and incident-response playbooks.
Validate ClaudeBot and Claude-SearchBot IP addresses. Remote MCP validate_ip tool.
Remote MCP server: 19 domain-hygiene and email-auth tools (DNS, SPF, DMARC, DKIM, TLS).
Query WHOIS/RDAP information for domains, IP addresses, CIDR prefixes and ASNs. Self-hostable.
Custom domains API for SaaS: connect, verify, and manage customer domains, SSL, and DNS
MCP server for DNSimple — domains, DNS zone records, availability, pricing and contacts.
Check a domain's registration status, or watch it for expiry, deletion, and availability.
IPInfo MCP — wraps ipinfo.io (free tier, no auth required for basic usage)
Explore FCC ULS licenses, ASR antenna structures, and microwave path elevation profiles.
IP Lookup MCP — ip-api.com (free, no auth for basic usage)
OpenCellID MCP — cell tower geolocation database (free with key)
GreyNoise Community MCP — internet scanner classification (free tier with key)
WHOIS, DNS, SSL, IP geo for security forensics and OSINT — separate from SEO.
49 developer tools via MCP: DNS, WHOIS, IP lookup, JWT, hashing, QR, and more.
Control Plane (controlplane.com): deploy and operate workloads across AWS, GCP, Azure, and more.