
Botd is a browser library for JavaScript bot detection.
Botd API is a free Security API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Free bot detection library that runs in the browser. Detects automation tools and frameworks. No server required, runs 100% on the client. MIT license, no usage restrictions.
Details from github.com.

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The Botd API is provided by fingerprintjs (github.com). Free bot detection library that runs in the browser. Detects automation tools and frameworks. No server required, runs 100% on the client. MIT license, no usage restrictions.
Yes. The Botd 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 Botd API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Botd API supports CORS, so front-end JavaScript can call it directly.
Yes. The Botd API is served over HTTPS, so it's safe to use in production.