DeFi Rate tracks daily Kalshi trading volume, market share, and event data across Kalshi’s prediction markets. Our Kalshi charts and Polymarket charts are updated daily and weekly. All data is available to be shared directly, or you can export with proper attribution. If you need specific Kalshi data, please submit a request by completing this form.
Kalshi Monthly Trading Volume & YTD Total
Kalshi monthly trading volume in USD with a running cumulative total for year-to-date.
Last updated: August 29, 2026 at 11:56 PM PDT
| Month ISO | Monthly Volume | MoM Change % | YTD Total | YTD YoY % |
|---|---|---|---|---|
| 2025-12 | $5.84B | — | $5.84B | — |
| 2026-01 | $9.51B | ▲ 63.0% | $9.51B | ▲ 57.9% |
| 2026-02 | $10.43B | ▲ 9.6% | $19.94B | ▲ 57.5% |
| 2026-03 | $13.10B | ▲ 25.7% | $33.05B | ▲ 48.2% |
| 2026-04 | $14.77B | ▲ 12.7% | $47.81B | — |
| 2026-05 | $17.98B | ▲ 21.8% | $65.80B | — |
| 2026-06 | $32.67B | ▲ 81.7% | $98.47B | — |
| 2026-07 | $41.12B | ▲ 25.9% | $139.59B | — |
| 2026-08 | $33.50B | ▼ 12.9% | $173.09B | — |
Kalshi Weekly Volume Chart
Kalshi weekly trading volume in USD. This chart is updated daily with rolling data, with final snapshot on Monday.
Last updated: August 29, 2026 at 11:57 PM PDT
| Week End | Weekly Volume Usd |
|---|---|
| 2025-12-07 | $1.52B |
| 2025-12-14 | $1.14B |
| 2025-12-21 | $1.11B |
| 2025-12-28 | $1.34B |
| 2026-01-04 | $1.71B |
| 2026-01-11 | $1.98B |
| 2026-01-18 | $2.01B |
| 2026-01-25 | $2.15B |
| 2026-02-01 | $2.26B |
| 2026-02-08 | $2.20B |
| 2026-02-15 | $2.80B |
| 2026-02-22 | $2.16B |
| 2026-03-01 | $2.59B |
| 2026-03-08 | $2.73B |
| 2026-03-15 | $2.86B |
| 2026-03-22 | $2.93B |
| 2026-03-29 | $3.40B |
| 2026-04-05 | $2.73B |
| 2026-04-12 | $2.90B |
| 2026-04-19 | $3.06B |
| 2026-04-26 | $3.91B |
| 2026-05-03 | $3.83B |
| 2026-05-10 | $4.11B |
| 2026-05-17 | $3.88B |
| 2026-05-24 | $3.99B |
| 2026-05-31 | $4.28B |
| 2026-06-07 | $4.43B |
| 2026-06-14 | $6.15B |
| 2026-06-21 | $9.00B |
| 2026-06-28 | $10.43B |
| 2026-07-05 | $10.72B |
| 2026-07-12 | $10.31B |
| 2026-07-19 | $9.10B |
| 2026-07-26 | $7.88B |
| 2026-08-02 | $8.42B |
| 2026-08-09 | $8.07B |
| 2026-08-16 | $8.67B |
| 2026-08-23 | $9.06B |
| 2026-08-30 | $6.54B |
Kalshi Daily Fees
| UTC Date | Estimated Gross Fees | Kalshi Contract Volume | Estimated Fee Rate | # of Trades |
|---|---|---|---|---|
| 2026-08-28 | $9.6M | $1.49B | 0.64% | |
| 2026-08-27 | $8.1M | $1.19B | 0.68% | |
| 2026-08-26 | $9.4M | $1.42B | 0.66% | |
| 2026-08-25 | $8.5M | $1.32B | 0.64% | |
| 2026-08-24 | $7.9M | $1.12B | 0.71% | |
| 2026-08-23 | $10.3M | $1.48B | 0.70% | |
| 2026-08-22 | $10.8M | $1.68B | 0.64% | |
| 2026-08-21 | $9.4M | $1.26B | 0.75% | |
| 2026-08-20 | $8.9M | $1.19B | 0.74% | |
| 2026-08-19 | $9.5M | $1.37B | 0.69% | |
| 2026-08-18 | $8.1M | $1.16B | 0.69% | |
| 2026-08-17 | $7.1M | $926.4M | 0.76% | |
| 2026-08-16 | $10.4M | $1.40B | 0.75% | |
| 2026-08-15 | $10.1M | $1.50B | 0.67% | |
| 2026-08-14 | $9.2M | $1.20B | 0.77% | |
| 2026-08-13 | $9.0M | $1.22B | 0.74% | |
| 2026-08-12 | $9.3M | $1.30B | 0.71% | |
| 2026-08-11 | $8.3M | $1.18B | 0.70% | |
| 2026-08-10 | $6.4M | $861.6M | 0.74% | |
| 2026-08-09 | $8.9M | $1.17B | 0.76% | |
| 2026-08-08 | $8.9M | $1.29B | 0.69% | |
| 2026-08-07 | $8.9M | $1.16B | 0.77% | |
| 2026-08-06 | $9.1M | $1.18B | 0.77% | |
| 2026-08-05 | $9.4M | $1.30B | 0.73% | |
| 2026-08-04 | $8.6M | $1.15B | 0.75% | |
| 2026-08-03 | $6.7M | $826.1M | 0.81% | |
| 2026-08-02 | $9.4M | $1.24B | 0.76% | |
| 2026-08-01 | $9.9M | $1.41B | 0.71% | |
| 2026-07-31 | $9.5M | $1.25B | 0.76% | |
| 2026-07-30 | $8.6M | $1.09B | 0.79% | |
| 2026-07-29 | $10.1M | $1.32B | 0.76% | |
| 2026-07-28 | $9.0M | $1.17B | 0.77% | |
| 2026-07-27 | $7.1M | $950.1M | 0.74% | |
| 2026-07-26 | $8.8M | $1.14B | 0.78% | |
| 2026-07-25 | $9.6M | $1.30B | 0.74% | |
| 2026-07-24 | $8.3M | $1.11B | 0.74% | |
| 2026-07-23 | $8.5M | $1.04B | 0.81% | |
| 2026-07-22 | $9.3M | $1.25B | 0.74% | |
| 2026-07-21 | $8.5M | $1.13B | 0.75% | |
| 2026-07-20 | $7.0M | $897.2M | 0.78% | |
| 2026-07-19 | $15.9M | $2.09B | 0.76% | |
| 2026-07-18 | $12.9M | $1.76B | 0.73% | |
| 2026-07-17 | $8.2M | $1.07B | 0.77% | |
| 2026-07-16 | $7.3M | $878.8M | 0.83% | |
| 2026-07-15 | $10.5M | $1.25B | 0.84% | |
| 2026-07-14 | $11.7M | $1.34B | 0.87% | |
| 2026-07-13 | $6.3M | $707.2M | 0.89% | |
| 2026-07-12 | $12.3M | $1.49B | 0.83% | |
| 2026-07-11 | $13.2M | $1.73B | 0.76% | |
| 2026-07-10 | $9.9M | $1.31B | 0.76% | |
| 2026-07-09 | $9.8M | $1.35B | 0.72% | |
| 2026-07-08 | $7.7M | $1.03B | 0.74% | |
| 2026-07-07 | $14.2M | $1.75B | 0.81% | |
| 2026-07-06 | $13.3M | $1.65B | 0.81% | |
| 2026-07-05 | $11.8M | $1.49B | 0.79% | |
| 2026-07-04 | $13.2M | $1.75B | 0.75% | |
| 2026-07-03 | $13.2M | $1.70B | 0.78% | |
| 2026-07-02 | $10.5M | $1.39B | 0.76% | |
| 2026-07-01 | $13.4M | $1.72B | 0.77% | |
| 2026-06-30 | $11.3M | $1.47B | 0.77% | |
| 2026-06-29 | $9.0M | $1.19B | 0.76% | |
| 2026-06-28 | $9.4M | $1.22B | 0.77% | |
| 2026-06-27 | $10.9M | $1.53B | 0.72% | |
| 2026-06-26 | $11.6M | $1.65B | 0.70% | |
| 2026-06-25 | $12.6M | $1.69B | 0.75% | |
| 2026-06-24 | $12.2M | $1.61B | 0.76% | |
| 2026-06-23 | $12.2M | $1.55B | 0.79% | |
| 2026-06-22 | $9.0M | $1.17B | 0.77% | |
| 2026-06-21 | $11.6M | $1.50B | 0.77% | |
| 2026-06-20 | $12.2M | $1.50B | 0.81% | |
| 2026-06-19 | $9.2M | $1.21B | 0.76% | |
| 2026-06-18 | $9.1M | $1.27B | 0.72% | |
| 2026-06-17 | $10.3M | $1.33B | 0.78% | |
| 2026-06-16 | $7.7M | $1.02B | 0.76% | |
| 2026-06-15 | $9.9M | $1.17B | 0.85% | |
| 2026-06-14 | $11.2M | $1.33B | 0.85% | |
| 2026-06-13 | $8.7M | $1.07B | 0.81% | |
| 2026-06-12 | $7.2M | $858.4M | 0.83% | |
| 2026-06-11 | $7.8M | $901.0M | 0.86% | |
| 2026-06-10 | $6.2M | $725.0M | 0.85% | |
| 2026-06-09 | $6.8M | $751.7M | 0.90% | |
| 2026-06-08 | $4.2M | $515.4M | 0.82% | |
| 2026-06-07 | $5.8M | $661.6M | 0.88% | |
| 2026-06-06 | $7.2M | $786.1M | 0.91% | |
| 2026-06-05 | $5.3M | $648.6M | 0.82% | |
| 2026-06-04 | $6.1M | $667.6M | 0.92% | |
| 2026-06-03 | $5.6M | $659.2M | 0.85% | |
| 2026-06-02 | $4.8M | $552.3M | 0.87% | |
| 2026-06-01 | $4.1M | $458.9M | 0.88% | |
| 2026-05-31 | $6.6M | $722.9M | 0.91% | |
| 2026-05-30 | $6.8M | $744.4M | 0.91% | |
| 2026-05-29 | $5.4M | $582.9M | 0.92% | |
| 2026-05-28 | $4.7M | $521.8M | 0.89% | |
| 2026-05-27 | $5.7M | $625.1M | 0.92% | |
| 2026-05-26 | $4.9M | $530.8M | 0.92% | |
| 2026-05-25 | $5.1M | $552.9M | 0.93% | |
| 2026-05-24 | $6.3M | $675.8M | 0.93% | |
| 2026-05-23 | $5.8M | $625.1M | 0.93% | |
| 2026-05-22 | $4.9M | $535.1M | 0.92% | |
| 2026-05-21 | $5.0M | $546.3M | 0.92% | |
| 2026-05-20 | $5.7M | $615.5M | 0.92% | |
| 2026-05-19 | $5.2M | $548.0M | 0.95% | |
| 2026-05-18 | $4.1M | $448.5M | 0.90% | |
| 2026-05-17 | $5.3M | $638.1M | 0.82% | |
| 2026-05-16 | $5.0M | $616.3M | 0.82% | |
| 2026-05-15 | $4.1M | $507.4M | 0.80% | |
| 2026-05-14 | $4.9M | $568.5M | 0.87% | |
| 2026-05-13 | $4.4M | $507.3M | 0.86% | |
| 2026-05-12 | $4.9M | $554.2M | 0.89% | |
| 2026-05-11 | $4.2M | $485.8M | 0.87% | |
| 2026-05-10 | $6.6M | $748.5M | 0.89% | |
| 2026-05-09 | $6.3M | $689.7M | 0.91% | |
| 2026-05-08 | $4.7M | $558.7M | 0.84% | |
| 2026-05-07 | $4.8M | $552.6M | 0.86% | |
| 2026-05-06 | $4.9M | $549.0M | 0.89% | |
| 2026-05-05 | $4.8M | $542.0M | 0.89% | |
| 2026-05-04 | $4.0M | $467.8M | 0.87% | |
| 2026-05-03 | $5.5M | $595.5M | 0.92% | |
| 2026-05-02 | $5.8M | $613.3M | 0.94% | |
| 2026-05-01 | $4.8M | $514.3M | 0.93% | |
| 2026-04-30 | $4.8M | $526.1M | 0.90% | |
| 2026-04-29 | $5.1M | $570.2M | 0.89% | |
| 2026-04-28 | $5.2M | $571.9M | 0.91% | |
| 2026-04-27 | $3.9M | $441.3M | 0.88% | |
| 2026-04-26 | $6.6M | $684.8M | 0.97% | |
| 2026-04-25 | $6.7M | $711.4M | 0.94% | |
| 2026-04-24 | $4.6M | $519.6M | 0.88% | |
| 2026-04-23 | $4.5M | $502.3M | 0.90% | |
| 2026-04-22 | $5.6M | $583.5M | 0.96% | |
| 2026-04-21 | $4.5M | $496.8M | 0.90% | |
| 2026-04-20 | $3.6M | $386.2M | 0.94% | |
| 2026-04-19 | $5.0M | $526.5M | 0.95% | |
| 2026-04-18 | $5.3M | $541.9M | 0.98% | |
| 2026-04-17 | $3.7M | $390.2M | 0.94% | |
| 2026-04-16 | $4.1M | $423.8M | 0.98% | |
| 2026-04-15 | $4.3M | $431.1M | 1.00% | |
| 2026-04-14 | $3.6M | $386.1M | 0.92% | |
| 2026-04-13 | $3.4M | $367.2M | 0.93% | |
| 2026-04-12 | $4.9M | $562.5M | 0.87% | |
| 2026-04-11 | $5.0M | $551.8M | 0.91% | |
| 2026-04-10 | $4.2M | $492.4M | 0.85% | |
| 2026-04-09 | $3.8M | $508.7M | 0.75% | |
| 2026-04-08 | $4.8M | $535.2M | 0.89% | |
| 2026-04-07 | $4.5M | $500.5M | 0.90% | |
| 2026-04-06 | $3.7M | $372.8M | 0.98% | |
| 2026-04-05 | $5.1M | $511.9M | 0.99% | |
| 2026-04-04 | $5.1M | $486.9M | 1.05% | |
| 2026-04-03 | $4.0M | $427.5M | 0.94% | |
| 2026-04-02 | $3.5M | $373.0M | 0.93% | |
| 2026-04-01 | $3.7M | $384.1M | 0.97% | |
| 2026-03-31 | $3.6M | $386.4M | 0.93% | |
| 2026-03-30 | $2.9M | $310.1M | 0.93% | |
| 2026-03-29 | $4.9M | $503.7M | 0.97% | |
| 2026-03-28 | $4.9M | $489.3M | 1.01% | |
| 2026-03-27 | $4.0M | $421.3M | 0.94% | |
| 2026-03-26 | $3.8M | $385.1M | 0.98% | |
| 2026-03-25 | $2.8M | $305.3M | 0.92% | |
| 2026-03-24 | $3.1M | $318.9M | 0.98% | |
| 2026-03-23 | $3.8M | $388.3M | 0.98% | |
| 2026-03-22 | $5.8M | $559.2M | 1.03% | |
| 2026-03-21 | $5.1M | $558.6M | 0.91% | |
| 2026-03-20 | $5.5M | $599.7M | 0.92% | |
| 2026-03-19 | $5.3M | $594.6M | 0.88% | |
| 2026-03-18 | $3.3M | $373.8M | 0.89% | |
| 2026-03-17 | $3.2M | $358.9M | 0.90% | |
| 2026-03-16 | $2.7M | $293.8M | 0.92% | |
| 2026-03-15 | $5.0M | $490.3M | 1.02% | |
| 2026-03-14 | $4.8M | $486.7M | 0.99% | |
| 2026-03-13 | $4.3M | $440.7M | 0.97% | |
| 2026-03-12 | $4.0M | $413.4M | 0.96% | |
| 2026-03-11 | $4.2M | $422.5M | 1.00% | |
| 2026-03-10 | $3.7M | $377.0M | 0.97% | |
| 2026-03-09 | $3.1M | $302.3M | 1.01% | |
| 2026-03-08 | $5.4M | $531.8M | 1.02% | |
| 2026-03-07 | $5.1M | $495.0M | 1.03% | |
| 2026-03-06 | $4.3M | $418.4M | 1.02% | |
| 2026-03-05 | $3.7M | $378.6M | 0.98% | |
| 2026-03-04 | $4.1M | $416.4M | 0.99% | |
| 2026-03-03 | $3.3M | $332.5M | 0.98% | |
| 2026-03-02 | $2.7M | $273.1M | 0.99% | |
| 2026-03-01 | $4.9M | $478.0M | 1.02% | |
| 2026-02-28 | $5.3M | $500.7M | 1.05% | |
| 2026-02-27 | $3.8M | $366.5M | 1.02% | |
| 2026-02-26 | $3.6M | $370.8M | 0.96% | |
| 2026-02-25 | $4.0M | $415.8M | 0.97% | |
| 2026-02-24 | $3.3M | $345.7M | 0.96% | |
| 2026-02-23 | $2.6M | $255.3M | 1.01% | |
| 2026-02-22 | $5.3M | $504.7M | 1.05% | |
| 2026-02-21 | $4.6M | $441.0M | 1.03% | |
| 2026-02-20 | $3.8M | $376.3M | 1.01% | |
| 2026-02-19 | $3.4M | $356.2M | 0.97% | |
| 2026-02-18 | $3.5M | $346.9M | 0.99% | |
| 2026-02-17 | $2.9M | $286.5M | 1.02% | |
| 2026-02-16 | $2.4M | $245.3M | 0.99% | |
| 2026-02-15 | $4.0M | $394.1M | 1.02% | |
| 2026-02-14 | $3.9M | $406.2M | 0.96% | |
| 2026-02-13 | $3.2M | $327.6M | 0.98% | |
| 2026-02-12 | $3.6M | $362.3M | 1.00% | |
| 2026-02-11 | $3.3M | $348.5M | 0.93% | |
| 2026-02-10 | $3.6M | $355.9M | 1.01% | |
| 2026-02-09 | $3.5M | $423.3M | 0.82% | |
| 2026-02-08 | $7.6M | $783.9M | 0.97% | |
| 2026-02-07 | $4.3M | $429.2M | 1.00% | |
| 2026-02-06 | $3.2M | $316.0M | 1.01% | |
| 2026-02-05 | $3.1M | $321.9M | 0.97% | |
| 2026-02-04 | $2.7M | $282.1M | 0.95% | |
| 2026-02-03 | $2.4M | $264.4M | 0.91% | |
| 2026-02-02 | $2.3M | $240.4M | 0.98% | |
| 2026-02-01 | $3.7M | $359.7M | 1.03% | |
| 2026-01-31 | $3.8M | $377.2M | 1.01% | |
| 2026-01-30 | $3.3M | $346.0M | 0.95% | |
| 2026-01-29 | $2.8M | $283.2M | 0.99% | |
| 2026-01-28 | $3.1M | $320.2M | 0.98% | |
| 2026-01-27 | $2.4M | $259.5M | 0.94% | |
| 2026-01-26 | $3.2M | $312.9M | 1.01% | |
| 2026-01-25 | $5.3M | $524.4M | 1.02% | |
| 2026-01-24 | $3.9M | $374.3M | 1.03% | |
| 2026-01-23 | $2.7M | $271.4M | 1.00% | |
| 2026-01-22 | $2.4M | $242.9M | 0.97% | |
| 2026-01-21 | $2.5M | $254.3M | 1.00% | |
| 2026-01-20 | $2.7M | $270.9M | 1.01% | |
| 2026-01-19 | $3.3M | $294.9M | 1.10% | |
| 2026-01-18 | $5.1M | $522.2M | 0.98% | |
| 2026-01-17 | $4.0M | $396.1M | 1.02% | |
| 2026-01-16 | $2.2M | $219.4M | 1.02% | |
| 2026-01-15 | $2.5M | $251.4M | 0.99% | |
| 2026-01-14 | $2.5M | $242.7M | 1.02% | |
| 2026-01-13 | $2.8M | $274.5M | 1.03% | |
| 2026-01-12 | $3.0M | $288.6M | 1.04% | |
| 2026-01-11 | $5.3M | $495.7M | 1.06% | |
| 2026-01-10 | $3.7M | $380.3M | 0.98% | |
| 2026-01-09 | $2.6M | $235.0M | 1.11% | |
| 2026-01-08 | $2.5M | $234.0M | 1.05% | |
| 2026-01-07 | $2.3M | $214.6M | 1.08% | |
| 2026-01-06 | $2.1M | $197.1M | 1.08% | |
| 2026-01-05 | $2.3M | $216.9M | 1.08% | |
| 2026-01-04 | $3.9M | $385.0M | 1.00% | |
| 2026-01-03 | $3.2M | $309.7M | 1.03% | |
| 2026-01-02 | $2.7M | $251.0M | 1.06% | |
| 2026-01-01 | $3.2M | $267.9M | 1.19% |
DeFiRate's Estimated Kalshi Fees chart tracks estimated daily gross fees generated by Kalshi based on aggregated contract volume and estimated fee schedules. The data shows how fee generation has changed over time, highlighting periods of increased trading activity, seasonal trends, and major event-driven spikes. These figures are estimates, not reported financial results, and are intended to provide directional insight into Kalshi's trading activity and potential revenue growth.
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.
Last updated: August 29, 2026 at 11:58 PM PDT
| Month | Sports | Politics/Gov | Finance/Fed | Weather | Other | Entertainment | Total |
|---|---|---|---|---|---|---|---|
| 2025-09 | $2,464,283,822.00 | $13,690,972.00 | $84,264,010.00 | $14,243,552.00 | $279,483,958.00 | $7,671,965.00 | |
| 2025-10 | $3,697,082,335.00 | $39,658,859.00 | $51,380,751.00 | $24,936,694.00 | $535,309,965.00 | $6,525,440.00 | |
| 2025-11 | $4,404,499,406.00 | $41,413,558.00 | $32,627,830.00 | $23,207,524.00 | $1,255,985,033.00 | $23,513,891.00 | |
| 2025-12 | $4,291,707,762.00 | $60,336,109.00 | $54,482,954.00 | $51,382,894.00 | $2,096,122,033.00 | $20,915,890.00 | |
| 2026-01 | $5,157,299,609.00 | $128,728,138.00 | $55,634,046.00 | $100,369,871.00 | $4,047,355,426.00 | $24,940,655.00 | |
| 2026-02 | $4,562,305,850.00 | $200,847,014.00 | $46,757,278.00 | $84,416,137.00 | $5,504,048,661.00 | $28,927,546.00 | |
| 2026-03 | $5,514,218,526.00 | $151,270,969.00 | $80,500,748.45 | $93,781,557.00 | $7,205,464,320.67 | $58,277,579.39 | |
| 2026-04 | $9,217,838,293.87 | $224,113,587.18 | $69,572,999.33 | $74,899,343.86 | $5,160,659,385.93 | $21,058,108.55 | |
| 2026-05 | $10,519,003,413.75 | $260,729,443.21 | $38,313,467.35 | $75,151,188.05 | $7,047,990,162.83 | $43,007,347.23 | |
| 2026-06 | $16,210,400,162.66 | $267,983,797.65 | $49,171,544.06 | $71,312,488.12 | $16,055,269,063.54 | $19,000,867.01 | |
| 2026-07 | $19,047,500,102.06 | $206,382,932.57 | $95,241,471.30 | $106,780,633.34 | $21,646,643,128.21 | $16,950,466.86 | |
| 2026-08 | $3,145,086,916.88 | $90,008,296.49 | $37,647,325.23 | $25,236,462.20 | $4,948,703,654.50 | $3,920,654.91 |
Kalshi vs Polymarket Market Share
Chart provides market share percentage for Kalshi vs. Polymarket on WoW basis. Hover tool tip available.
Last updated: August 30, 2026 at 3:38 AM PDT
Methodology
Trading volume data is sourced from Kalshi’s public market activity. Market share figures are derived by comparing Kalshi and Polymarket reported volumes over the same period. Raw data is reviewed and cleaned prior to publication. 2025 figures sourced from Dune for YoY comparison.
Dollar volume represents the total notional value of contracts traded (number of contracts × price paid), not open interest or fees. All figures are in USD.
Events are assigned to a single category at the time of listing. Recategorizations are not retroactively applied to historical months.
All charts are updated daily. Weekly figures are finalized each Sunday and locked; intra-week bars reflect volume to date.
Represents lifetime volume for each market from open to close, regardless of when the event occurred.
All dollar figures are rounded to the nearest $10M for display. Underlying CSV data is unrounded.
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.