Foundations
How to read Polymarket probabilities without mistaking them for forecasts
A practical guide to interpreting prediction-market prices, confidence, movement, liquidity, and resolution rules before drawing a conclusion.
Start with the simplest interpretation
A market shown at 65% is best read as the current trading consensus implying roughly a 65-in-100 chance of the stated outcome. It does not mean the outcome is certain, that every participant agrees, or that the estimate has been independently validated.
Prices aggregate the views and incentives of the people currently participating. That can be informative, especially when new information arrives quickly, but it also means the number inherits the market's limitations: thin participation, unclear wording, uneven information, and short-term positioning.
Treat the question as a contract
The headline is only a summary. The resolution rules define what actually counts. Dates, named sources, geographic boundaries, and phrases such as “announced”, “released”, or “takes effect” can produce materially different outcomes.
Before comparing a market with a poll, forecast, or news headline, confirm that they are measuring the same event over the same period. A market about an official announcement is not necessarily a market about when a product becomes generally available.
- Read the full resolution criteria, including the named resolution source.
- Check the close date and whether the market can resolve early.
- Look for edge cases such as postponements, recounts, substitutions, or ambiguous terminology.
Add confidence context to the percentage
A probability becomes more useful when viewed alongside participation. Liquidity indicates how much depth is available around current prices; trading activity shows whether people are actively testing the estimate. Neither makes a market correct, but both help distinguish a broad, contested price from a fragile quote.
EventAlpha labels signal quality using stored probability history, liquidity, activity, freshness, and movement. That label is a reading aid—not a score for whether Yes or No will win.
Read movement as a prompt to investigate
A move from 40% to 55% is a 15 percentage-point change, not a 15% increase. The size is meaningful, but the explanation still needs evidence. News, a related result, new market participation, or temporary order-book imbalance can all move the price.
The disciplined response is to ask what changed, whether the move appeared across related markets, and whether credible reporting supports a likely driver. When evidence is weak, uncertainty is the honest conclusion.