The Stash app lets you easily invest in stocks and ETFs using personalized investment strategies with as little as $0.01 to get started, plus you can earn a $50 bonus when you register and fund your new Stash account with at least $20, and you can earn extra $50 rewards for referring your friends. [Read More] Stash Invest: $50 Sign-Up Bonus + $1,000 Yearly Referral Credits