Convert text to speech.
IBM Text to Speech API is a free Development API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Use the IBM Watson Text to Speech service to synthesize written text to natural-sounding speech. The synthesized audio uses appropriate cadence and intonation for its language and dialect. The documentation describes the Text to Speech service for IBM Cloud, IBM Cloud Pak for Data, and IBM Cloud Pa…
Details from cloud.ibm.com.

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The IBM Text to Speech API is provided by IBM Cloud Docs (cloud.ibm.com). Use the IBM Watson Text to Speech service to synthesize written text to natural-sounding speech. The synthesized audio uses appropriate cadence and intonation for its language and dialect. The documentation describes the Text to Speech service for IBM Cloud, IBM Cloud Pak for Data, and IBM Cloud Pa…
Yes. The IBM Text to Speech API is listed in the Development 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 IBM Text to Speech API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The IBM Text to Speech API supports CORS, so front-end JavaScript can call it directly.
Yes. The IBM Text to Speech API is served over HTTPS, so it's safe to use in production.