These days, there are many online casinos with games like poker. I wonder, how would a betting price site would be?
Like betting 0.01BTC on the price of bitcoin. If, I've bet that by tomorrow it will have pass 10,000$ I would get the analogous amount of BTC
If the price wouldn't, I would have simply lost my funds. There is a difference with poker here, tho. Central authorities, cannot control it. So the man that has the site, may bankrupt. On the other hand, I think we can admit that online poker (especially with real money) is never on pure luck of the cards.
Then BitMEX will serve you well. You can bet the price where it will go, and that needs skills to predict where the price will move. With using leverage, you can get a bigger profit if your prediction is right, and you will get lose the money if your prediction is wrong. But in the poker games, you need skills to play better than the other opponent, and you should realize the bluff factor will be necessary to make your opponent scare of your card.