Are there any costs - and if so, which – for releasing a conversational action I've built?
It is obvious that Firebase and/or Dialogflow cost some money, but what if you actually don’t use any of these services? I only use Google Assistant to capture voice input, then I call a webhook (I host the server) and reply with a message, which GA reads aloud. Would I get the STT and TTS without charge in this scenario (I doubt so)?
Note: A similar question has already been asked here
However the answers for this question only cover costs during the development stage.