[@Mike]
I am just providing another way for users who what to transcribe audio file in a cheaper way.
Just as I have said, Many tools are developing some features based on the Google API but charge more money. Why not let the users have the opportunity to use the API directly just like the developers?
Anyway, calling the API is the cheapest method and that is what our developers do. However, for users without programing skills, the door is closed.