Key Points Centralized cryptocurrency exchanges still account for most crypto trading in the U.S. Fintech companies are continually rolling out new crypto trading and investing options for the most popular cryptos. Blockchain technology has led to the creation of new decentralized exchanges and mobile blockchain wallets. 10 stocks we like better than Robinhood Markets › The most popular places for U.S. investors to buy and sell cryptocurrencies are still the big centralized cryptocurrency exchang ...