Free Stock Photos and Videos.
Pexels API is a free Photography API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Yes. The Pexels API is listed in the Photography 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 Pexels API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Pexels API supports CORS, so front-end JavaScript can call it directly.
Yes. The Pexels API is served over HTTPS, so it's safe to use in production.