Recent data from market analyst firm CryptoCompare reveals that the leading six cryptocurrency exchanges, as per the company's analytical model, were responsible for a three-year high in spot volume throughout the month of August.  The metric grades all cryptocurrency exchanges across a multitude of areas — including legal/regulatory cases, data provision, security and market quality, among others — and ranks them in a list accordingly. Popular exchanges Coinbase, Gemini, Kraken, CrossTower, Bitstamp and itBit all received AA grading status within the August period with a score ranging from 86.26 to 75.28, respectively.