I trade cryptocurrency with lexatrade.com since the end of summer. Yes, it's not so long to earn a million)) But it's enough to say a few words about this company.
It is quite convenient to work with them. There is a good training and they give a personal manager who is in touch 24/7 (my manager got sick for a week, but tech support took over his work).
The most important thing is to pass verification before withdrawing money. The withdrawal itself takes 3-4 days, which is fast enough for a brokerage firm (I know, I worked with several and waited for money for 2-3 WEEKS!)