Canadian Football League (CFL)
Official JSON API providing real-time league, team and player statistics about the CFL

UFC and MMA fight data: fighters, cards, round stats, rankings and live state.
Cito UFC API is a free Sports & Fitness API that requires apiKey authentication, is served over HTTPS and does not support CORS, so it should be called from a server.
UFC API for developers. Get UFC fighters, rankings, events, fight cards, bout results, and round-by-round fight stats with clean REST endpoints.
Details from citoapi.com.

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Official JSON API providing real-time league, team and player statistics about the CFL
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The Cito UFC API is provided by Cito API (citoapi.com). UFC API for developers. Get UFC fighters, rankings, events, fight cards, bout results, and round-by-round fight stats with clean REST endpoints.
Yes. The Cito UFC API is listed in the Sports & Fitness 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 Cito UFC API uses apiKey authentication, so you need to register for credentials before making requests.
Not directly. The Cito UFC API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The Cito UFC API is served over HTTPS, so it's safe to use in production.