Rewarded Play

They are lot of app like this and many of them are not paying but this got great reviews of people that have being reward with gift cards

Play Games, Choose Your Gift Card Reward! Amazon, Walmart, Ebay, Target & More!
Earn FREE gift cards for your favorite stores while you play games you love at home! Play free games with Rewarded Play, the one-stop app for all of the casual games you love to play. Choose your rewards and get free gift cards just for playing from the comfort of home!