Coinbase - Bitcoin, safe and easy.
Micro Work 4 all - New Website aiming to get more workers and job seekers to perform tiny task and make money.
Binance - Cryptocurrencies exchange platform
Picoworkers - Earn money from doing short, easy tasks similar to Microworkers. Picoworkers is the best alternative to Microworkers I ever find.
Poloniex - US-based cryptocurrency exchange with maximum security
Amazon Mechanical Turk - The online market place for work.