Best Odds
Prediction Market Dominance Index
A composite score measuring market action on Kalshi versus Polymarket. The index combines 24h volume share, liquidity share, and liquidity turnover.Kalshi
+25
Kalshi LeanINDEX COMPONENTS
Kalshi
Polymarket
24h Volume (55%)
10%90%
Liquidity (25%)
77%23%
Turnover (20%)
3%97%
Today's Snapshot
Head-to-head comparison of Kalshi and Polymarket across key metrics.ACTIVITY
Kalshi
Polymarket
24h VolumeTrading activity
$8.07M
$75.75M
Liquidity TurnoverVolume / Liquidity
0.01x
0.23x
Volume per EventAvg. activity per event
$25.19M
$378.35M
DEPTH
Kalshi
Polymarket
Total LiquidityAvailable depth
$1.10B
$325.98M
Liquidity per EventDepth per event
$109.85M
$27.17M
All-Time VolumeHistorical total
$251.88M
$4.54B
BREADTH
Kalshi
Polymarket
Open EventsDistinct events
10
12
Open MarketsActive contracts
245
298
Markets per EventGranularity
24.5
24.8
MARKET SHARE
Kalshi
Polymarket
Volume Share% of 24h volume
9.6%
90.4%
Liquidity Share% of total liquidity
77.1%
22.9%
Turnover Share% of capital efficiency
3.1%
96.9%
Note: Metrics are calculated from matched events where both platforms have active markets.
Methodology
How we calculate the Dominance IndexThe Dominance Index measures where traders are most active across prediction markets. Each venue's share (0-100%) is calculated for three metrics, then combined using the weights below.
THE FORMULA
Index = 55% x Volume Share + 25% x Liquidity Share + 20% x Turnover Share
55%Volume Share
Each venue's 24-hour trading volume divided by total volume across both venues. Weighted highest as recent activity is the strongest signal.
25%Liquidity Share
Each venue's order book depth divided by total liquidity across both venues. More depth means larger trades execute with less slippage.
20%Turnover Share
Each venue's turnover ratio (Volume / Liquidity) divided by total turnover. Measures how actively capital is being deployed.
0KALSHI50EVEN100POLYMARKET
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