Reports / August 2025
Monthly report
August 2025: $2.01B traded on prediction markets
Notional volume across 4 exchanges was $2.01B, −0.2% from July. Polymarket led with a 54.8% share. The busiest day was Sat Aug 30, 2025, at $129M.
Exchanges
Ranked by the month's volume.
| # | Exchange | Volume | Share | vs prior month |
|---|---|---|---|---|
| 1 | Polymarket | $1.10B | 54.8% | −13% |
| 2 | Kalshi | $874M | 43.4% | +18% |
| 3 | Crypto.com | $31.0M | 1.5% | new |
| 4 | ForecastEx | $4.4M | 0.2% | −2.5% |
What traded
At exchanges that publish a split.
Sports, single-leg 74%Combos (parlays) 0%Non-sports 26%
Daily average: $64.9M over 31 days
Busiest days
- Sat Aug 30, 2025: $129M
- Sun Aug 31, 2025: $101M
- Fri Aug 22, 2025: $85.0M
- Fri Aug 29, 2025: $83.4M
- Sun Aug 17, 2025: $73.9M
August 2025: questions
How much volume did prediction markets trade in August 2025?
$2.01B in notional volume across 4 exchanges, down 0% from July. That is $64.9M a day on average.
Which prediction market had the most volume in August 2025?
Polymarket. The top three were Polymarket ($1.10B, 54.8%), Kalshi ($874M, 43.4%), Crypto.com ($31.0M, 1.5%).
How much prediction market volume was sports in August 2025?
74% at the exchanges that publish a split, including 0% in combos (parlays). Non-sports markets were 26%.
Notional volume: contracts traded × each contract's payout, from each exchange's own daily report. Download every day as CSV · Methods · All reports