Predict.org is a prediction market operated by the Better Data Initiative, a New York City-based 501(c)3 nonprofit. This market is not for profit and all data will be freely available to serious academic researchers up on request.
A prediction market, also known as information market, is a financial exchange where participants trade in contracts whose payoff depends on unknown future events. These contracts are commonly referred as “event futures”. In an efficient market, the price will best reflect the likelihood of the event.
Here is a more detailed discussion about the prediction market in general and predict.org in particular.
The trading exchange is currently being developed. Stay tuned.