Table 3 shows the regression models of regressing spread on the real and the reported trading volumes. Except for spot, the regression models based on the real trading volume data have better performances than models based on the reported trading volume, with higher R square. For spot, the small sample size could be a reason for the R square being slightly lower than that of the model using the reported trading volume data. As the reported trading volume includes plenty of fake trades, we would expect a weak relationship between spread and the reported trading volume and that’s what the results we got as well. NerdWallet's Best Crypto Exchanges and Apps of November 2023 You’ll also need to consider whether you want to trade more than Bitcoin, which is what the majority of traditional brokers restrict you to. If not, you may want to turn to a cryptocurrency exchange, since they offer more choice of tradable cryptocurrencies.