DeFi Rate tracks daily Kalshi trading volume, market share, and event data across Kalshi’s prediction markets. Charts updated weekly and monthly, can be shared directly, and are available for export with attribution.
Kalshi Monthly Trading Volume & YTD Total
Kalshi monthly trading volume in USD with a running cumulative total for year-to-date.
| Month ISO | Monthly Volume | MoM Change % | YTD Total | YTD YoY % |
|---|---|---|---|---|
| 2025-12 | $5.84B | — | $5.84B | — |
| 2026-01 | $9.05B | ▲ 55.1% | $9.05B | ▲ 55.1% |
| 2026-02 | $9.70B | ▲ 7.1% | $18.75B | ▲ 54.0% |
| 2026-03 | $12.29B | ▲ 26.7% | $31.04B | ▲ 45.3% |
| 2026-04 (partial) | $6.44B | — | $37.49B | — |
Kalshi Weekly Volume Chart
Kalshi weekly trading volume in USD. This chart is updated daily with rolling data, with final snapshot on Monday.
Kalshi Volume by Market Category — Monthly Growth
Kalshi's monthly trading volume split by category. Sports accounts for more than 80% of total volume. The 'Other' category includes Exotics, which are Kalshi's combination markets.
Kalshi vs Polymarket Market Share
Chart provides market share percentage for Kalshi vs. Polymarket on WoW basis. Hover tool tip available.
Methodology
Volume figures represent total notional value. This is the number of contracts traded multiplied by the face value of each contract. This is not open interest, and it does not include fees. All figures are in USD.
No. Kalshi counts volume by multiplying contracts by their $1 face value rather than the price paid, and records both sides of every transaction separately. A contract bought and sold at $0.10 generates $2.00 in volume against $0.10 in actual dollars exchanged. The longer the odds, the wider the gap, and for the same reason headline volume figures bear little relationship to Kalshi’s actual fee revenue.
All charts update daily. Weekly figures are finalized each Sunday and locked; bars showing the current week reflect volume to date, not a completed week. Monthly figures follow the same daily cycle.
Sports markets, primarily major US leagues and tournament events, consistently drive more than 80% of Kalshi’s total monthly volume. Event-driven trading spikes around postseason schedules and marquee matchups pull a disproportionate share of contract activity.
The cumulative line tracks year-to-date notional volume from January 1 of the current calendar year. It resets each year, so the figure currently shown reflects 2026 activity only, not all-time volume.
Market share compares Kalshi’s reported volume against Polymarket’s over the same rolling weekly window. Both figures are drawn from public market activity and normalized to USD.
We pull volume data from Kalshi’s public API. All data is reviewed and cleaned before publication.
Events are assigned to a single category at the time of listing and that assignment doesn’t change retroactively, so historical monthly breakdowns reflect the label in place when the market was live.
Yes, each chart includes a CSV export option. Display figures are rounded to the nearest $10M; the underlying CSV files are unrounded.