title: Google Cloud Text-to-Speech API Authentication from the frontend via API key possible?
body: <p>The use case is a frontend application that does not have any backend so normally I would expect to use an api key ( <a href="https://cloud.google.com/docs/authentication/api-keys" rel="nofollow noreferrer">https://cloud.google.com/docs/authentication/api-keys</a> ) but in the complete text to speech documentation ( <a href="https://cloud.google.com/text-to-speech/docs/" rel="nofollow noreferrer">https://cloud.google.com/text-to-speech/docs/</a> ) I can't find any information about if (and how) its possible to use api keys for the Cloud Text-to-Speech API. </p>
  
  <p>I don't think its such an uncommon use case to use the text to speech functionality in a standalone frontend (especially with the new WaveNet voices), so I thought I would ask the question here if anyone has some tips where to look for this information or if it's currently really only ment as an API usable in the backend. </p>