The best alternatives to TradeX are Predicto, Prop Hero, and Predict. If these 3 options don't work for you, we've listed a few more alternatives below.
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Prop Hero is an interactive gaming platform that allows fans of live sports to compete in the action by correctly predicting what is going to happen while they watch. Prop Hero can be embedded into broadcast streams or used as a second screen experience.
Augur is a decentralized prediction market built on the Ethereum blockchain. It allows you to forecast events and be rewarded for predicting them correctly.