Same way Robinhood does. Btw, they don’t have api yet, but that’s next logical step. Crypto exchanges are not reliable so difficult to code for. Probably the reason no one providing api yet.
You can get access to the spot market at Coinbase and futures at CoinFLEX, Deribit, BitMEX, CME and Bakkt on the TT platform. https://www.tradingtechnologies.com/markets/cryptocurrencies/
Thats crazy Every 10 years or so a new thing is invented for the nee bubble its same classic bubble but a new item is in it its like men going to war cuz of a woman Timeless Lolz