Sounds cool though. you can give bigger amounts for harder levels. start off with people earning fractions. or have it where you earn a type of coin in the game, then you can cash out into c2.1 like 100 in game coins = 1 coin2.1 just an example.
Nickquest, do you know what functionality you would require from the interface? I'm guessing you are looking simply at sending and receive coins? I assume this will be kalisto's first question.