FFraud is a free IP and email intelligence API for anyone who runs a sign-up form, a checkout or a login page.
What it does: check any IP address for a fraud score, abuse history and VPN, proxy, Tor or data center use, or check an email address for throwaway and invalid domains. The data comes from its own honeypot sensors and community reports.
How it works: the public lookups need no key, and there are no daily or monthly caps. One request such as GET https://api.ffraud.com/public/ip/{ip} returns the full result for that address as JSON. Email checks work the same way.
For AI agents: FFraud runs a hosted MCP server at https://ffraud.com/api/mcp (Streamable HTTP, no key, nothing to install). Add that one address to Claude, Cursor or any MCP client and the model can call ip_check, email_check, domain_check and ip_reports while it works.
Easy to switch: endpoints in the AbuseIPDB, IPQualityScore and ipinfo formats let a project move over by changing one URL.
Docs: https://ffraud.com/docs