AppBounty rewards you with gift cards for trying new apps. To get your free gift cards is very simple, just Download AppBounty in the Google PlayStore
Each app has a certain amount of credits that you will get for just downloading and trying it out. Once you have downloaded enough apps and earned enough credits you can buy the gift card of your choice: Google PlayStore Gift Cards, iTunes, Amazon, Xbox Live, PSN Cards and more! PS, you can use your iTunes to get free in-app currencies like Gems!
You can even earn more credits by inviting your friends! Earn bonus credits by getting your friends to sign up using your specialized invite code!