On June 23, 2026, VolRoc recorded 201,245 active prediction markets across Kalshi and Polymarket, holding $2.24B in combined open interest. Day over day, active markets rose 65.6% and open interest rose 13.5% (vs June 22, 2026). Sports was the largest domain by open interest (52%), ahead of Politics & Elections (17%); together they accounted for 68% of all open interest. Kalshi carried 99% of active markets and Polymarket 1%.
Deterministic · template v1 · 2026-06-23
As of 2026-06-23 · 00:00 UTC
Active Markets
201,245
00:00 UTC freeze
Open Interest
$2.24B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
14,643
with trading activity
Kalshi / Polymarket
99% / 1%
by active-market count
Domain Composition — 12 domains
Sports
151,714
Mixed / Multi-category
30,655
Other
10,921
Politics & Elections
3,727
Entertainment & Culture
2,142
Crypto & Digital Assets
596
Economics & Inflation
570
Companies & Business
322
Monetary Policy
276
Technology & AI
140
Climate & Weather
84
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 = 201,245.
Largest Kalshi Series
Sports — multi-game parlays
141,330
Cross-category multi-markets
30,655
Music — artist streams
813
Midterm control
757
U.S. House races
605
Wcstageofelim
292
Nextteamnba
289
Mlbhr
259
NFL — next team moves
253
California primaries
239
Primarymov
223
Wcteamleadgoal
208
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 23, 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 23, 2026.” https://volroc.ai/prediction-markets/2026-06-23/
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