Quantfury is an app-based trading platform with half a billion in daily trading volume, available on the iOS App Store and the Google Play Store. After signing up with a referral code and funding your account with US$100 or more of one of nine cryptocurrencies, you will earn US$10-250 of cryptocurrency or stock which can be immediately cashed out at market rates. Note that rewards and your deposit must be held on the platform for 30 days before withdrawing in order to not void the reward.
Deposits, withdrawals and trading are all feeless on Quantfury, with trading available at up to 20x trading power. For what it's worth, my reward was $20 of Bitcoin, others have reported rewards in ETH or even American Airlines stock.
Mod: Added to referral randomiser.