Thanks for pointing that out. But if you just go to their
home page and scroll down, under "The Forward" there is "%Premium" and it's, as I assumed, the Annual Equivalent Rate of the price excess (or discount) until maturity.
What it says in the resources (
click on "margining") doesn't make much sense to me. It says that
"We employ a proprietary algorithm to estimate the current Forward premium or discount. This algorithm draws data from various markets that offer to trade instruments on the future delivery of bitcoin."However, to estimate the premium, wouldn't you have to look at bitcoin spot price rather than other derivative exchanges?
I think it probably means "from various spot markets".