Polymarket Accuracy — How Reliable Are Prediction Markets?

How prediction market accuracy works

Prediction markets are considered well-calibrated when events priced at 70% happen roughly 70% of the time. Academic research has consistently shown that prediction markets outperform polls, expert panels, and statistical models for forecasting binary outcomes.

Polymarket, as the largest prediction market by volume, benefits from deep liquidity and a diverse set of informed traders. Higher volume markets tend to be more accurate because they attract more participants with unique information.

Key factors that affect accuracy include market liquidity, time until resolution, number of active traders, and the availability of objective resolution criteria.

Why whale traders matter

Large traders (whales) are often the most informed participants in a prediction market. Their positions can move markets significantly and often provide early signals about how an event will resolve.

By tracking whale positions and trades, you can identify high-conviction bets before the market fully prices in the information.