
Speech-to-text in 25 languages and text-to-speech with 43 voices in 32 languages.
Audexum API is a free Machine Learning API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
How to call the Audexum text-to-speech REST API. Bearer key auth, JSON request, WAV/MP3/OGG/Opus response. Streaming TTS, webhooks. 43 voices, 32 languages.
Details from audexum.com.

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The Audexum API is provided by Audexum (audexum.com). How to call the Audexum text-to-speech REST API. Bearer key auth, JSON request, WAV/MP3/OGG/Opus response. Streaming TTS, webhooks. 43 voices, 32 languages.
Yes. The Audexum API is listed in the Machine Learning 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 Audexum API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Audexum API supports CORS, so front-end JavaScript can call it directly.
Yes. The Audexum API is served over HTTPS, so it's safe to use in production.