The Topic Extraction API provides additional speech insights by extracting a list of topics from a given transcript.


This API is available in Labs for free through at least January 31, 2022.

API endpoint

The base URL for this version of the API is https://api.rev.ai/topic_extraction/v1/. All endpoints described in this documentation are relative to this base URL.


Clients must authenticate by including their Rev AI access token as a query parameter in their requests. If the access token is invalid or the query parameter is not present, a 401 error code will be returned.

Length limit

Job submissions with input longer than 14000 words exceed our length restrictions and will fail.