There were over 700 cryptocurrencies in existence at the end of 2016. In 2017, the trading volume for the 8-year-old cryptocurrency market has grown to exceed $100 billion. The four largest cryptocurrencies in 2017 are Bitcoin, Litecoin, Ethereum, and Ripple. The growing popularity of cryptocurrencies has helped bolster the market value of these four coins during the first half of 2017.