Our blog article explains some streams with data relating to traffic, wind, radio, airport, hospital wait times, agricultural futures, chess ratings, financial quantities of all varieties and more. These are drawn from the full stream list. Like everything else, there are JSON equivalents.
Here are some articles going into further depth, and illustrating some of the subtlies of competitive, distributional prediction at microprediction.org.
A Call for Contributions to a Copula Contest
Algorithms try to predict bivariate and trivariate relationships between five minutely returns of Bitcoin, Ethereum, Ripple, Cardano and Iota. Can you beat them?