Multilingual sentiment analysis of texts from different sources.
Sentiment Analysis API is a free Text Analysis 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 Sentiment Analysis API is listed in the Text Analysis 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 Sentiment Analysis API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Sentiment Analysis API supports CORS, so front-end JavaScript can call it directly.
Yes. The Sentiment Analysis API is served over HTTPS, so it's safe to use in production.