Sentiment Analysis
Multilingual sentiment analysis of texts from different sources
Text Analytics with focus on detection of abusive content and law enforcement applications.
Tisane API is a free Text Analysis API that requires OAuth authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Tisane: NLP for user-generated content with a focus on content moderation. Detect insults, hate speech, PII exfiltration. Translate dirty language.
Details from tisane.ai.

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Multilingual sentiment analysis of texts from different sources
The Tisane API is provided by Tisane Labs (tisane.ai). Tisane: NLP for user-generated content with a focus on content moderation. Detect insults, hate speech, PII exfiltration. Translate dirty language.
Yes. The Tisane 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 Tisane API uses OAuth authentication, so you need to register for credentials before making requests.
Yes. The Tisane API supports CORS, so front-end JavaScript can call it directly.
Yes. The Tisane API is served over HTTPS, so it's safe to use in production.