This is the only thing i do complained about these brokers,if you do win a certain bet and they payout 80-85% of the amount had bet in which means brokers do really have that big deduction on each
prediction you would make.Brokers that had been mentioned above are heavily centralized where these are tied up with Forex and stock market tickers and just only add up bitcoin into their list.
When you are just really aiming to have options trading solely for Bitcoin then Betinance.com is a new one.
I also have a suggestion site that provides Bitcoin and other cryptocurrencies to trade there. There is Olymp Trade and Iq Option, the site has been running for quite a long time and is popular. To start playing people should learn to analyze market movements.