Reports / August 2026
Monthly report
August 2026: $51.19B traded on prediction markets
Notional volume across 10 exchanges was $51.19B, −10% from July. Kalshi led with a 78.2% share. The busiest day was Sat Aug 29, 2026, at $2.36B.
Exchanges
Ranked by the month's volume.
| # | Exchange | Volume | Share | vs prior month |
|---|---|---|---|---|
| 1 | Kalshi | $40.03B | 78.2% | −2.5% |
| 2 | Polymarket | $4.66B | 9.1% | −42% |
| 3 | Polymarket US | $3.82B | 7.5% | −24% |
| 4 | Crypto.com | $968M | 1.9% | −13% |
| 5 | Novig | $629M | 1.2% | new |
| 6 | Robinhood | $594M | 1.2% | −65% |
| 7 | Underdog | $347M | 0.7% | 35.1× |
| 8 | DraftKings | $83.7M | 0.2% | 6.6× |
| 9 | Gemini | $37.1M | 0.1% | −25% |
| 10 | ForecastEx | $23.8M | <0.1% | −21% |
What traded
At exchanges that publish a split.
Daily average: $1.65B over 31 days
Busiest days
- Sat Aug 29, 2026: $2.36B
- Sat Aug 22, 2026: $2.20B
- Sun Aug 30, 2026: $2.07B
- Sat Aug 15, 2026: $2.00B
- Fri Aug 28, 2026: $1.94B
August 2026: questions
How much volume did prediction markets trade in August 2026?
$51.19B in notional volume across 10 exchanges, down 10% from July. That is $1.65B a day on average.
Which prediction market had the most volume in August 2026?
Kalshi. The top three were Kalshi ($40.03B, 78.2%), Polymarket ($4.66B, 9.1%), Polymarket US ($3.82B, 7.5%).
How much prediction market volume was sports in August 2026?
81% at the exchanges that publish a split, including 41% in combos (parlays). Non-sports markets were 19%.
Notional volume: contracts traded × each contract's payout, from each exchange's own daily report. Download every day as CSV · Methods · All reports