I was just today approved for Robinhood Crypto, a zero commission crypto trading service from Robinhood. Although I didn't have a ton of money to invest today I did give the platform a try to see how it looked and the speed of the execution.
Let me first say I am completely impressed with what they have done with the platform. The trading was quick and the execution took only around one second to complete. They have integrated limit orders in order to give buyers the best opportunity to lock in a good price on both buys and sells and I believe that is one of the best parts of this new platform.
Currently Robinhood plans to expand the variety of coins you can buy as well as the states that it is available in so be sure to look out for that in the future. I know I plan to place some more money into the crypto world sometime soon.