Prediction Markets Record All-Time High $4.9B Volume to End 2025
Alex Smith
1 month ago
The year started with a whisper and ended with a roar for prediction markets as combined notional volume surpassed $4.9 billion for the week of Dec. 29, led by Opinion Labs, Kalshi and Polymarket, respectively.
As 2026 begins, the data suggests prediction markets are comfortably out of their exploratory phase and into a full-on growth sprint, posting record notional trading volumes with each new week. Meanwhile, onchain prediction exchange Opinion has become impossible to ignore. Opinion posted $1.81 billion in notional volume to close out the year as the market leader, though Kalshi and Polymarket remain the most relevant platforms for institutional partnerships and mainstream adoption.
Both Kalshi and Polymarket also post all-time high weekly volumes to close out 2025: Kalshi $1.71B (Dec. 22-28) and Polymarket $1,45B (Dec. 29 – Jan. 4).
Weekly notional volume snapshot (Dec. 29 – Jan. 4):
PlatformWeekly Notional VolumeShare of TotalOpinion$1,809,464,85636.90%Kalshi$1,576,002,26832.10%Polymarket$1,445,093,13629.40%Predict$71,754,8441.50%Myriad$2,786,513Related Articles
$1.63B in Super Bowl Prediction Market Volume, $304M on Culture: Full Data Breakdown
We tracked $1.63B in Super Bowl prediction market volume across 68+ markets and...
DraftKings Stock Drops 15% on Earnings Miss, Doubles Down on Prediction Markets
In Q4 2025 earnings call, DraftKings CEO confirmed plans to invest heavily in ne...
Rebuilding sUSD
A new path for Synthetix's stablecoinsUSD is the synthetic asset that power...
Polymarket and Kaito Roll Out Attention Markets for ‘Mindshare’ Trading: What It Means
Polymarket has two live attention markets on where public sentiment or "mindshar...