Home › Glossary › Midpoint price
The midpoint is halfway between the best bid and the best ask. It is a common one-number summary of where a market is, because the last trade can be stale.
Our Polymarket vs Kalshi comparisons use the bid-ask midpoint on each exchange, so a gap is not just one side's stale last trade.
Bid-ask spread · Order book · Implied probability
Our Polymarket vs Kalshi comparisons use the bid-ask midpoint on each exchange, so a gap is not just one side's stale last trade.
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