On June 6, 2026, VolRoc recorded 134,371 active prediction markets across Kalshi and Polymarket, holding $1.60B in combined open interest. Day over day, active markets rose 78.0% and open interest rose 9.4% (vs June 5, 2026). Sports was the largest domain by open interest (48%), ahead of Politics & Elections (27%); together they accounted for 75% of all open interest. Kalshi carried 94% of active markets and Polymarket 6%.
Deterministic · template v1 · 2026-06-06
As of 2026-06-06 · 00:00 UTC
Active Markets
134,371
00:00 UTC freeze
Open Interest
$1.60B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
14,961
with trading activity
Kalshi / Polymarket
94% / 6%
by active-market count
Domain Composition — 12 domains
Sports
90,321
Mixed / Multi-category
20,519
Other
12,302
Politics & Elections
5,732
Entertainment & Culture
2,310
Crypto & Digital Assets
1,003
Economics & Inflation
707
Companies & Business
485
Monetary Policy
376
Technology & AI
287
World & Geopolitics
152
Climate & Weather
89
Science & Health
88
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 = 134,371.
Largest Kalshi Series
Sports — multi-game parlays
79,786
Cross-category multi-markets
20,519
Music — artist streams
855
Midterm control
726
U.S. House races
595
California primaries
321
Mlbhr
260
NFL — next team moves
231
Primary vote shares
221
World Cup — games
203
Mlbhit
195
Nextteamnba
193
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 6, 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 6, 2026.” https://volroc.ai/prediction-markets/2026-06-06/
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