TradeBlock’s XBX index is an institutional-quality reference rate for the USD-denominated price of bitcoin. TradeBlock draws from a variety of data sources to make the XBX index the market’s most robust, institutionally-focused reference rate. In addition to data from various global exchanges, TradeBlock is also the only company in the world able to incorporate significant volumes of large, verified, off-exchange trades, the data for which is obtained through unique agreements with our institutional clients.