On June 13, 2026, VolRoc recorded 171,753 active prediction markets across Kalshi and Polymarket, holding $1.96B in combined open interest. Day over day, active markets rose 34.6% and open interest rose 8.8% (vs June 12, 2026). Sports was the largest domain by open interest (53%), ahead of Politics & Elections (20%); together they accounted for 73% of all open interest. Kalshi carried 95% of active markets and Polymarket 5%.
Deterministic · template v1 · 2026-06-13
As of 2026-06-13 · 00:00 UTC
Active Markets
171,753
00:00 UTC freeze
Open Interest
$1.96B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
15,907
with trading activity
Kalshi / Polymarket
95% / 5%
by active-market count
Domain Composition — 12 domains
Sports
119,156
Mixed / Multi-category
29,441
Other
12,413
Politics & Elections
5,574
Entertainment & Culture
2,177
Crypto & Digital Assets
928
Economics & Inflation
665
Companies & Business
422
Monetary Policy
390
Technology & AI
283
World & Geopolitics
153
Climate & Weather
81
Science & Health
70
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 = 171,753.
Largest Kalshi Series
Sports — multi-game parlays
106,391
Cross-category multi-markets
29,441
Music — artist streams
855
Midterm control
735
U.S. House races
599
Mlbhr
290
Pgatour
274
Wctotal
270
Wcstageofelim
256
California primaries
253
NFL — next team moves
250
Nextteamnba
220
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 13, 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 13, 2026.” https://volroc.ai/prediction-markets/2026-06-13/
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