http://www.techradar.com/news/google-wants-to-pay-you-to-find-bugs-in-popular-third-party-android-apps

Google is eager to clamp down on security flaws associated with some of the most high-profile apps in its Android library, so it's enlisting white-hat hackers as a part of the effort. Should you successfully find a bug in a qualifying app on Google Play, Google will pay you nifty $1,000 for your efforts.

Google is partnering with bug bounty service HackerOne for the project, which it calls the Google Play Security Reward Program. The worldwide program currently only applies to eight popular apps such as Duolingo, Snapchat, Tinder, Headspace and Alibaba, although Google's own suite of apps for Android qualify as well.