OpenFoot API
Football fixtures, results, standings, lineups, live events and shot-level xG across 75 competitions
Crowd sourced sports league results.
OpenLigaDB API is a free Sports & Fitness API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Api zum Abrufen von Daten zur Fußball-Bundesliga und vielen weiteren Ligen
Details from openligadb.de.

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Football fixtures, results, standings, lineups, live events and shot-level xG across 75 competitions
Real-time Pinnacle odds for 13 sports — live and prematch over REST, WebSocket and SSE drop alerts
The OpenLigaDB API is provided by OpenLigaDB (openligadb.de). Api zum Abrufen von Daten zur Fußball-Bundesliga und vielen weiteren Ligen
Yes. The OpenLigaDB 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.
No. The OpenLigaDB API requires no authentication, so you can start making requests without signing up.
Yes. The OpenLigaDB API supports CORS, so front-end JavaScript can call it directly.
Yes. The OpenLigaDB API is served over HTTPS, so it's safe to use in production.