Prediction markets recorded a total trading volume of $123.3 billion in October, with Kalshi accounting for

Prediction markets posted record October volume of $123.3 billion, their first month above $100 billion and up roughly 53.9% from September's record, per Artemis data, with 642.9 million trades. Kalshi led with $98.2 billion (about 80% of total) across 465.5 million trades, while Polymarket handled $20.2 billion across 148 million trades. Football-season parlay products drove Kalshi's volume, accounting for 67.6% of its monthly total, with most contracts priced under 1 cent—though Kalshi counts volume at the full $1 payout value per contract, so the figure overstates actual capital deployed. US midterm election markets exceeded $1.4 billion in volume, and crypto contracts on Kalshi and Polymarket topped $3 billion for the first time in two consecutive weeks. Polymarket's US platform neared $10 billion in October volume, up about 15% from its prior record. Watch whether parlay-driven volume sustains beyond football season and whether election and crypto markets keep scaling into November.