Prediction markets trade $1.33B so far on Oct. 15 across 9 exchanges, with Kalshi at $1.14B

Prediction-market trading volume reached $1.33B so far on Oct. 15 across 9 exchanges, according to DeFi Rate’s intraday tracker. Kalshi accounted for $1.14B of that activity in the report published Oct. 15, 2026, at 12:09 PM ET.

Polymarket US recorded $75M, while Polymarket recorded $63M. The figures put Kalshi well ahead of those two venues in reported trading volume for the day so far.

A partial-day snapshot

The Oct. 15 total compares with $3.36B for the full day on Oct. 14, according to DeFi Rate. Because the latest figure covers only part of the day, the comparison does not establish whether full-day activity is rising or falling.

DeFi Rate’s supplied source excerpt separately reports $3.4B over the last 24 hours. It also distinguishes contracts measured at their $1 face value from dollars actually paid, listing $24.9B for the latter without specifying its measurement period in the excerpt. Those valuation and timing distinctions matter when comparing the figures.

What it means for prediction markets

• Activity is concentrated: Kalshi accounts for the bulk of the reported Oct. 15 volume across the 9 exchanges.
• The reporting window matters: The $1.33B intraday total, $3.36B prior-day total and $3.4B rolling 24-hour figure cover different windows.
• Volume is not a probability signal: These exchange-level totals describe trading activity, not changes in the implied likelihood of any particular outcome.