Bitcoin solo mining pool stats, per-address miner stats and an open dataset of solo-mined blocks.
SoloLuck API is a free Cryptocurrency API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.

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Yes. The SoloLuck API is listed in the Cryptocurrency 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 SoloLuck API requires no authentication, so you can start making requests without signing up.
Yes. The SoloLuck API supports CORS, so front-end JavaScript can call it directly.
Yes. The SoloLuck API is served over HTTPS, so it's safe to use in production.