On August 2, 2026, VolRoc recorded 184,138 active prediction markets across Kalshi and Polymarket, holding $1.44B in combined open interest. Day over day, active markets fell 11.9% and open interest fell 12.6% (vs August 1, 2026). Sports was the largest domain by open interest (41%), ahead of Politics & Elections (34%); together they accounted for 75% of all open interest. Kalshi carried 86% of active markets and Polymarket 14%.
Deterministic · template v1 · 2026-08-02
As of 2026-08-02 · 00:00 UTC
Active Markets
184,138
00:00 UTC freeze
Open Interest
$1.44B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
17,223
with trading activity
Kalshi / Polymarket
86% / 14%
by active-market count
Domain Composition — 12 domains
Sports
122,007
Mixed / Multi-category
26,797
Other
20,931
Politics & Elections
6,441
Entertainment & Culture
2,632
Crypto & Digital Assets
1,365
Companies & Business
1,018
Technology & AI
982
Economics & Inflation
951
Monetary Policy
389
World & Geopolitics
374
Climate & Weather
175
Science & Health
76
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 = 184,138.
Largest Kalshi Series
Sports — multi-game parlays
103,180
Cross-category multi-markets
26,797
Midterm control
950
Music — artist streams
753
U.S. House races
604
Nextteamnba
486
Nflwins
275
NFL — next team moves
257
Mlbhr
253
Nextteammlb
238
Mlbhit
219
Mlbhrr
209
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 August 2, 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 — August 2, 2026.” https://volroc.ai/prediction-markets/2026-08-02/
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