I’m glad you are both happy about entering into this deal. I think the most unusual thing in this situation is that the trade is happening between people who know each other (even if only a little). If you just want to take a bet as to which direction a crypto is heading, you can try whaleclub. There is a spread, so regardless of which way you bet you are losing a bit of money at the outset (or rather it needs to move far enough your way before you start making money). I tried it and it was super easy — too easy in fact, in that I quickly lost more than I anticipated. There are ways to limit how much you are willing to lose — be sure to learn how to do that before jumping in!