Kiprio Translate
Free text translation with language detection, supports 50+ languages

Context-aware text translation and language detection for 100+ languages.
Langbly 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.
Google Translate v2 compatible translation API with global and EU data residency base URLs. Main endpoint: POST /language/translate/v2. Docs hub entry point.
Details from langbly.com.

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The Langbly API is provided by Langbly API Docs (langbly.com). Google Translate v2 compatible translation API with global and EU data residency base URLs. Main endpoint: POST /language/translate/v2. Docs hub entry point.
Yes. The Langbly 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 Langbly API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Langbly API supports CORS, so front-end JavaScript can call it directly.
Yes. The Langbly API is served over HTTPS, so it's safe to use in production.