But tread carefully and manage your risk well if you intend to use leverage on something like Bitcoin. Things can blow up in your face real quick if you don't have the cash to cover it.
+1
I short on plus500; they offer 1:5, but I use 1:4 (or even less sometimes) so i can cover if price goes up.
This is why I won't put my money in CampBx. They offer leverage, but they don't ensure customers are covered, so they might drive themselves bankrupt if there's a big swing up or down.