Yesbit.io

Yesbit lets you gamble on the price of financial assets like stocks and commodities, by trying to predict their future price. Users will join a contract and take either the short or long side, all contracts have a fixed price of 0.05 ETH. If you go short, this means you are predicting that the price of a given asset will go down in price. If it does, then you win the contract amount from the losing party. If you take the short position in a contract and it goes up in price, then you lose your contract amount, and the person who took the long side will be rewarded with your contract amount.