The program helps developers to grow their use base, drives engagement and increases revenue. 
The GetJar Rewards program is backed by ad spend and consumers are rewarded Gold Coins (virtual currency) that they can spend on premium apps and in-app purchases. 
The GetJar Rewards SDK (RSDK) is a fantastic way to increase the revenue performance of in-app sales by letting users spend GetJar Gold, the virtual currency supported by GetJar users and advertisers. Every GetJar user gets a GetJar Gold account and earns Gold by trying new apps.  If they don't have enough Gold, they can earn more during the purchase and checkout flow within your apps. When users buy an item from your app, GetJar pays you in cash.