On June 22, 2026, VolRoc recorded 121,555 active prediction markets across Kalshi and Polymarket, holding $1.97B in combined open interest. Day over day, active markets fell 6.2% and open interest fell 6.1% (vs June 21, 2026). Sports was the largest domain by open interest (48%), ahead of Politics & Elections (19%); together they accounted for 66% of all open interest. Kalshi carried 99% of active markets and Polymarket 1%.
Deterministic · template v1 · 2026-06-22
As of 2026-06-22 · 00:00 UTC
Active Markets
121,555
00:00 UTC freeze
Open Interest
$1.97B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
14,464
with trading activity
Kalshi / Polymarket
99% / 1%
by active-market count
Domain Composition — 12 domains
Sports
85,132
Mixed / Multi-category
17,218
Other
11,163
Politics & Elections
3,761
Entertainment & Culture
2,202
Crypto & Digital Assets
590
Economics & Inflation
584
Companies & Business
308
Monetary Policy
274
Technology & AI
140
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 = 121,555.
Largest Kalshi Series
Sports — multi-game parlays
76,177
Cross-category multi-markets
17,218
Music — artist streams
814
Midterm control
755
U.S. House races
604
Wcstageofelim
290
Nextteamnba
278
NFL — next team moves
253
California primaries
239
Primarymov
219
Wcteamleadgoal
204
Nbadraftteam
200
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 22, 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 22, 2026.” https://volroc.ai/prediction-markets/2026-06-22/
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