Stay away from coinbase futures!!!
Do yourselves a favor and stay away from any type of coinbase futures, it should definitely not be allowed to be used by coinbase users yet. When making trades using futures let's say you buy Bitcoin longs, it goes up and you sell it for a 50$ profit. On your portfolio page it'll show anywhere from 30-50$ in profit cause of the price difference in which the trade executed that's fine. Your portfolio will say your up 30$. You wait till the next day and realize your portfolio is actually down 20$. You to to check the taxes page in coinbase. You actually lost 20$ in that trade you made. Imagine doing several day trades and you find out you actually lost several hundreds or even thousands of dollars instead of gaining it. This is what happens when you currently trade with futures.
I made hand written notes of my transactions my balance my balance should be around 8500-8700$. My actual coinbase balance is now at 6500$. Stay away for your own moneys sake. The only way to actually make gains is the make highly profitable trades and even those will be a lot lower then what you think they are. Any trades at a loss will be at double the price shown.
I have sent proof to coinbase showing a +80$ trade showing I made 80$ in my portfolio actually losing me 20$ in the taxes and history tab, it has been weeks and they still have not sent their "special team" to help with this known proven issue.
Be careful!!