On June 24, 2026, VolRoc recorded 287,108 active prediction markets across Kalshi and Polymarket, holding $2.42B in combined open interest. Day over day, active markets rose 42.7% and open interest rose 8.1% (vs June 23, 2026). Sports was the largest domain by open interest (54%), ahead of Politics & Elections (16%); together they accounted for 69% of all open interest. Kalshi carried 99% of active markets and Polymarket 1%.
Deterministic · template v1 · 2026-06-24
As of 2026-06-24 · 00:00 UTC
Active Markets
287,108
00:00 UTC freeze
Open Interest
$2.42B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
15,672
with trading activity
Kalshi / Polymarket
99% / 1%
by active-market count
Domain Composition — 12 domains
Sports
224,880
Mixed / Multi-category
43,120
Other
11,097
Politics & Elections
3,750
Entertainment & Culture
2,160
Crypto & Digital Assets
618
Economics & Inflation
569
Companies & Business
310
Monetary Policy
280
Technology & AI
141
Climate & Weather
85
World & Geopolitics
67
Science & Health
31
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 = 287,108.
Largest Kalshi Series
Sports — multi-game parlays
213,744
Cross-category multi-markets
43,120
Music — artist streams
805
Midterm control
757
U.S. House races
606
Nextteamnba
316
Mlbhr
296
Wcstageofelim
296
Nbadraftteam
257
NFL — next team moves
253
California primaries
239
Primarymov
225
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 June 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 — June 24, 2026.” https://volroc.ai/prediction-markets/2026-06-24/
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