Not sure if any of my Steemit friends are into Bitcoin, Ethereum, or maybe just Steem haha.. But, when it comes to BTC/ETH/LTC, and stocks, fiats, etc.. Whaleclub is the way to go! Whaleclub also gives you demo money to play with, to try it out before you commit any real money!(5 BTC worth!) They have marginal trading on cryptos up to 10x, and 222x on fiats! Give it a shot, use my link, and have fun!
https://whaleclub.co/join/NcE0h
Comment or PM me with any questions!