If you are interested in accessing other functionality via an API (e.g. alignment data, bulk synthesis) please contact us at feedback@lmnt.com.

What’s new

Nov 16, 2023The v1 API is here! We’ve added a number of new features/endpoints, including the ability to create, update, and delete voices.
Aug 28, 2023synthesize now accepts a length parameter to adjust audio output duration to the specified length
Jul 13, 2023custom voice creation/cancellation API


All requests need an API key. The API key is sent in each request through the X-API-Key header. New API keys can be obtained at the LMNT Account page.