Ask HN: Anyone Using Google's “Speech-to-Text” Service?

I'm thinking about building a little test app that uses Google's Speech to Text Service, but since it involves money (yea you can do a bit for free, but generally speaking, there's a cost involved) I'm trying to make sure all my bases are covered before I do a deeper dive.

Basically I'm looking for something similar to the following functionality:

1. Client sends request with audio 2. App server receives request and forwards to Google's S2T API 3. S2T transcribes the audio into text and responds to the app server 4. App server responds to client with transcribed text

Would this type of functionality be available? Any help is appreciated.