Prediction Markets Hit Record $123.3 Billion in October
Monthly trading volume and trade count reached all-time highs, led by Kalshi's dominant share of the sector.
Updated on Nov. 2, 2026 in Investing
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Prediction markets recorded $123.3 billion in trading volume in October 2026, a monthly record, with 642.9 million trades. Kalshi accounted for roughly 80% of the volume, processing $98.2 billion.
Why it matters
The sharp jump, with October volume growing about 53.9% over September's previous high, signals rapid expansion of event-contract trading. Kalshi's concentration of volume highlights how much of the sector now depends on a single platform.
Kalshi reported $98.2 billion in October volume and 465.5 million trades, while Polymarket reported $20.2 billion and 148 million trades. Because Kalshi counts each contract at its full $1 payout, a parlay bought for under one cent can add a full dollar to reported volume.
The players
Kalshi
A U.S.-regulated prediction market platform that dominated October trading volume and set multiple weekly records.
Polymarket
A prediction market platform that processed $20.2 billion in October volume, including a monthly high of nearly $10 billion on its U.S. platform.
The details
Kalshi set three back-to-back weekly volume records in October, with its largest week exceeding $25 billion in the week ending October 25. Combos made up 67.6% of Kalshi's October volume, and crypto volume on Kalshi and Polymarket together crossed $3 billion.
Timeline
October 2026: record month for prediction-market volume and trade count.
Week ending October 25, 2026: Kalshi's largest weekly volume record, above $25 billion.
November 3, 2026: U.S. midterm elections; midterm contracts settle after the vote.
Market Dynamics
Midterm markets passed $1.4 billion in volume, with Kalshi's midterm volume nearly $1.1 billion, showing election-linked event contracts becoming a major share of the sector. The growth sits alongside record crypto volume above $3 billion, a sign that prediction markets are diversifying beyond politics.
Prediction-market users trading small-dollar parlays should note that reported volume and actual money at risk can differ sharply. Those considering these platforms should weigh the risk of contracts that settle only after an event concludes.
The takeaway
Record reported volume does not equal record money at risk, so check how a platform counts trades before judging its size. Review each contract's settlement timing and payout structure before trading.
What happens next
Midterm contracts settle after the November 3, 2026 U.S. midterm elections, and football markets continue through the rest of the regular season.
Further reading
For more on how these platforms work, explore Investing coverage on Wisevoter.
Source note: This article includes information reported by Cryptopolitan.
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