So I found this similar app like current. Where you can listen to music to earn $. It's called Sweet.io
Same idea, just listen stream music through their app and receive sweet points. But their song variety and artist is more. Gift prizes are more as well. You need to listen to music to unlock gifts that you can trade-in your points for. You can facebook sign in, twitter sign in, email sign in.
The downside for this app is that you need to have spotify premium in order to listen to their music to gain sweet points.