How much is Bitcoin (BTC) worth today - online price chart in relation to the dollar. Price predictions and a chart of Bitcoin futures on the Chicago Mercantile Exchange (CME). Where can you buy Bitcoin and how it works. The Bitcoin chart shows the change in the price of a cryptocurrency online. Bitcoin is the first ever successful cryptocurrency. It accounts for most of the cryptocurrency market capitalization and, although there are more technological projects, it is Bitcoin that remains the most popular cryptocurrency.