Kalshi holds about 76% of a $96.6B 30-day market

DeFi Rate’s volume tracker puts trading across prediction-market venues at about $96.6B over Sep. 13–Oct. 12, with Kalshi accounting for about $73.1B, or about 76%.

Kalshi leads the 30-day tally

The figures place Kalshi at the center of the tracked market’s activity for the period. Its reported volume exceeded that of all other covered venues combined.

Polymarket US ranked second, according to DeFi Rate. The available summary does not provide its trading volume or percentage share, leaving the size of the gap beyond Kalshi’s lead unspecified.

Scope of the figures

The snapshot was published on Oct. 13, 2026, at 3:54 AM ET. It describes a 30-day trading-volume window, rather than a single day’s activity.

The underlying page text was unavailable. The supplied material therefore does not establish the tracker’s methodology, the full list of covered venues or how volume was distributed among individual contracts.

What it means for prediction markets

• Venue concentration: Kalshi’s roughly 76% share indicates that most reported trading in this window occurred on one platform.
• Ranking, not a complete comparison: Polymarket US held second place, but the available figures do not quantify its share.
• Volume is not contract-level liquidity: These aggregate totals do not establish market depth or execution conditions for any particular event.