vBet costs and access control

[1QuickSI]

I see you currently are support the following translation engines:
Google Translation API v2, Microsoft Translation API, Apertium Translation API

I found the pricing structure for Google, but not the other 2. Would you happen to have links to their tiered pricing structure?

Also can I control access to vBet via user groups? I would like to assign user groups that can use vBet thus not allowing everyone and their mother to use it.

TIA

Edit: Also is it possible to offer vBet to only specific forums and not the entire site?