Volume
High volume = deep market. Low volume = thin market.
Prediction Markets 101 editorial team Updated April 16, 2026 1 min read
Definition
Volume is the total dollar amount traded in a market over a period (typically daily or cumulative).
Plain-English explanation
On Polymarket and Kalshi, volume is displayed per market. $3.6B was traded on the 2024 US presidential election on Polymarket — the largest prediction market volume in history.