How we track, display, and refresh market data
Transparency on data sources, refresh cadence, and calculation methods.
Data sources
All data shown on this site is pulled from publicly available APIs or public order books on the platforms listed in our sources section. We do not use private feeds, and we do not modify prices.
Implied probability
Implied probability on this site is computed directly from the YES price. A YES at 62¢ equals 62% implied probability. We do not apply house-edge adjustments because prediction markets already quote net of fees.
Volume and open interest
Volume is the cumulative dollar value of YES and NO contracts traded over the life of the market. Open interest is the dollar value of currently-held positions. Both figures are rounded to the nearest dollar for display.
Price history
Price history is shown as the daily closing implied probability over the prior 30 days. Gaps in the data (when a platform API was unavailable) are interpolated only for display smoothing and clearly flagged as such where they occur.
Categorization
Markets are assigned to one of five categories — Politics, Economy, Crypto, Sports, Culture — based on the underlying event. We review category assignment monthly.
Errors and corrections
If you find a price, volume, or metadata error, email [email protected]. We verify and publish corrections within 48 hours.