Total trading volume in prediction markets reached $123.3 billion in October, with Kalshi accounting for approximately 80%.

on November 2, according to Artemis data, total prediction market volume for October reached $123.3 billion, marking the first time it surpassed $100 billion, up approximately 53.9% from September's record, with 642.9 million transactions.

Of this total, Kalshi recorded a volume of $98.2 billion, accounting for approximately 80%, with 465.5 million transactions; Polymarket recorded a volume of $20.2 billion and 148 million transactions.

Parlay products driven by the football season were the main driver, accounting for 67.6% of Kalshi's monthly volume, with most contracts priced under 1 cent.

Notably, Kalshi calculates volume based on the full payout value of each contract at $1, so this figure does not equal the actual capital invested by traders.

Additionally, US midterm election market volume exceeded $1.4 billion, while crypto contract trading volume on both Kalshi and Polymarket crossed the $3 billion mark for two consecutive weeks for the first time.

Polymarket's US platform saw October volume approach $10 billion, up approximately 15% from its previous record.