Prediction markets just rolled out some impressive numbers for December. The combined spot trading volume across major platforms hit $19.1B—crushing the previous all-time high by roughly 35%.

Here's how the top three stacked up:

🥇 Kalshi dominated with $7B in volume
🥈 Opinion came in second at $6.7B
🥉 Polymarket rounded out the podium at $5.3B

It's a significant jump that shows growing interest in event-based betting and prediction-style trading. Whether driven by major news cycles or just increased retail participation, the market's clearly expanding.