Reports / October 2025
Monthly report
October 2025: $8.78B traded on prediction markets
Notional volume across 5 exchanges was $8.78B, +89% from September. Kalshi led with a 50.1% share. The busiest day was Sun Oct 19, 2025, at $437M.
Exchanges
Ranked by the month's volume.
| # | Exchange | Volume | Share | vs prior month |
|---|---|---|---|---|
| 1 | Kalshi | $4.40B | 50.1% | +54% |
| 2 | Polymarket | $4.12B | 46.9% | +150% |
| 3 | Crypto.com | $238M | 2.7% | +80% |
| 4 | ForecastEx | $22.6M | 0.3% | 3.6× |
| 5 | Polymarket US | $2K | <0.1% | new |
What traded
At exchanges that publish a split.
Sports, single-leg 88%Combos (parlays) 2%Non-sports 10%
Daily average: $283M over 31 days
Busiest days
- Sun Oct 19, 2025: $437M
- Sun Oct 12, 2025: $428M
- Sun Oct 26, 2025: $410M
- Sat Oct 25, 2025: $409M
- Sun Oct 5, 2025: $395M
October 2025: questions
How much volume did prediction markets trade in October 2025?
$8.78B in notional volume across 5 exchanges, up 89% from September. That is $283M a day on average.
Which prediction market had the most volume in October 2025?
Kalshi. The top three were Kalshi ($4.40B, 50.1%), Polymarket ($4.12B, 46.9%), Crypto.com ($238M, 2.7%).
How much prediction market volume was sports in October 2025?
90% at the exchanges that publish a split, including 2% in combos (parlays). Non-sports markets were 10%.
Notional volume: contracts traded × each contract's payout, from each exchange's own daily report. Download every day as CSV · Methods · All reports