
Data Analytics.
Keen IO API is a free Machine Learning API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Keen is a fully managed event streaming platform built on Apache Kafka. Start streaming in minutes with 30 days free.
Details from keen.io.

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The Keen IO API is provided by Keen (keen.io). Keen is a fully managed event streaming platform built on Apache Kafka. Start streaming in minutes with 30 days free.
Yes. The Keen IO API is listed in the Machine Learning 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 Keen IO API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Keen IO API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Keen IO API is served over HTTPS, so it's safe to use in production.