Actually, it doesn't matter which broker you will choose for scalping, because all the brokers offer good conditions for scalpers. The matter here for you is that there will be less requotes and delays. In this case all brokers offer fast order execution, however there might be an issues with commissions. You have to choose a broker which take fewer commission, becaue scalping implies many trades per short period, thus it will directly affect the commissions which are taken for opening a position. Moreover, you have to look at the spreads, because they also matter for all scalpers. If you're fond of crypto trading then perhaps you can try binance or bybit.