
Query IPs in the GreyNoise dataset and retrieve a subset of the full IP context data.
GreyNoise API is a free Security API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
The Community API provides community users with a free tool to query IPs in the GreyNoise dataset and retrieve a subset of the full IP context data returned by the IP Lookup API.
Details from docs.greynoise.io.

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The GreyNoise API is provided by GreyNoise (docs.greynoise.io). The Community API provides community users with a free tool to query IPs in the GreyNoise dataset and retrieve a subset of the full IP context data returned by the IP Lookup API.
Yes. The GreyNoise API is listed in the Security 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.
Yes. The GreyNoise API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the GreyNoise API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The GreyNoise API is served over HTTPS, so it's safe to use in production.