CryptoCompare's Aggregate Index Methodology is used for selecting exchanges to be included in our aggregated index (CCCAGG) on a pair-by-pair basis. It leverages aggregated market data as well as CryptoCompare's Exchange Benchmark Report. We collect market data from over 230 exchanges, for over 150,000 pairs. Given such a fragmented market, choosing exchanges to incorporate into an index for a specific pair is important, in order to accurately reflect specific markets.