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pivit.io - Nice iOS app, only binary outcomes, playmoney
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intrade.com - The most notably prediction market so far, now back with Bitcoin betting
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predictit.org - University project, limit to $800 per person per bet.
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Augur, Ethereum prediction market
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https://www.ipredict.co.nz/
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http://tippie.uiowa.edu/iem/
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http://inklingmarkets.com/ - mainly focused on internal prediction market for companies
More here: https://angel.co/prediction-markets