CryptoCoin Charts provides charts on the long-time prices of altcoins (i.e. cryptocurrencies other than Bitcoin) along with an order book. There are a lot of altcoins available, and CryptoCoin Charts is intended to help users identify ones worth investing in. CryptoCoin Charts currently stores over 50 million trades for 263 currency pairs, collected from 27 different exchanges. Developers can access some of this information via REST calls.