United CFX (united-cfx.com) advertises low fees but once you dig into the fine print, there are numerous charges that add up quickly. Inactivity fees, withdrawal fees, currency conversion fees - it all eats into your returns. I wish I had read the terms more carefully.
Pros: Real-time alerts|Professional team|API access
Cons: Inactivity fee applies after 12 months|Desktop app not available on Linux