Wiki
Guides and references for trading prediction markets - the fees, rebates and mechanics that actually cost you money, explained with the real numbers.
Prediction market fees and rebates
What a trade actually costs on Polymarket, Kalshi, Gemini, Robinhood and more, with a calculator for the fee, the rebate and the effective price you pay.
The prediction markets directory
Every venue worth trading, the data you can backtest on, and the tools people have shipped. Rebuilt from an open repo every day.