On June 10, 2026, VolRoc recorded 118,059 active prediction markets across Kalshi and Polymarket, holding $1.59B in combined open interest. Day over day, active markets fell 21.2% and open interest fell 5.5% (vs June 9, 2026). Sports was the largest domain by open interest (49%), ahead of Politics & Elections (25%); together they accounted for 74% of all open interest. Kalshi carried 93% of active markets and Polymarket 7%.
Deterministic · template v1 · 2026-06-10
As of 2026-06-10 · 00:00 UTC
Active Markets
118,059
00:00 UTC freeze
Open Interest
$1.59B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
14,780
with trading activity
Kalshi / Polymarket
93% / 7%
by active-market count
Domain Composition — 12 domains
Sports
77,787
Mixed / Multi-category
17,230
Other
12,037
Politics & Elections
5,615
Entertainment & Culture
2,116
Crypto & Digital Assets
1,018
Economics & Inflation
765
Companies & Business
500
Monetary Policy
382
Technology & AI
290
World & Geopolitics
152
Science & Health
88
Climate & Weather
79
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 = 118,059.
Largest Kalshi Series
Sports — multi-game parlays
66,720
Cross-category multi-markets
17,230
Music — artist streams
857
Midterm control
730
U.S. House races
598
California primaries
273
Pgatour
251
NFL — next team moves
249
Mlbhr
246
Wcstageofelim
227
Primary vote shares
222
World Cup — games
216
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 10, 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 10, 2026.” https://volroc.ai/prediction-markets/2026-06-10/
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