Continuously probed registry of APIs, MCP servers and CLIs callable by agents.
Agent Nexus API is a free Development API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
DNS records, WHOIS/RDAP, IP ownership and domain reports for AI agents, paid per call via x402
Yes. The Agent Nexus API is listed in the Development category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The Agent Nexus API requires no authentication, so you can start making requests without signing up.
Yes. The Agent Nexus API supports CORS, so front-end JavaScript can call it directly.
Yes. The Agent Nexus API is served over HTTPS, so it's safe to use in production.