On July 24, 2026, VolRoc recorded 117,731 active prediction markets across Kalshi and Polymarket, holding $1.43B in combined open interest. Day over day, active markets fell 24.4% and open interest fell 2.3% (vs July 23, 2026). Sports was the largest domain by open interest (42%), ahead of Politics & Elections (31%); together they accounted for 73% of all open interest. Kalshi carried 65% of active markets and Polymarket 35%.
Deterministic · template v1 · 2026-07-24
As of 2026-07-24 · 00:00 UTC
Active Markets
117,731
00:00 UTC freeze
Open Interest
$1.43B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
20,582
with trading activity
Kalshi / Polymarket
65% / 35%
by active-market count
Domain Composition — 12 domains
Sports
65,656
Other
27,861
Mixed / Multi-category
7,748
Politics & Elections
6,503
Entertainment & Culture
2,708
Crypto & Digital Assets
1,931
Climate & Weather
1,204
Companies & Business
1,189
Technology & AI
985
Economics & Inflation
899
World & Geopolitics
505
Monetary Policy
459
Science & Health
83
Venue-agnostic subject taxonomy from Kalshi series prefixes and
Polymarket title keywords. A residual Other bucket is reported honestly.
Yes-price across both venues, 10 buckets from 0 to 100. n = 117,731.
Largest Kalshi Series
Sports — multi-game parlays
41,864
Cross-category multi-markets
7,748
Midterm control
898
Music — artist streams
768
U.S. House races
595
Nextteamnba
464
NFL — next team moves
254
Nflwins
230
Nextteammlb
227
Flprimary
195
Albumequiv
165
Rt
161
Kalshi market families (Polymarket is not series-structured).
About & Citation
This is the fixed-hour (00:00 UTC) state of every active market on
Kalshi and Polymarket for July 24, 2026. The live
Observatory
shows the current diurnal value; this record is immutable. Open interest combines Kalshi
open interest with Polymarket USD liquidity as comparable USD magnitudes. Sources: Kalshi, Polymarket.
How to cite
“VolRoc Prediction Market Archive — July 24, 2026.” https://volroc.ai/prediction-markets/2026-07-24/
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