On July 11, 2026, VolRoc recorded 248,185 active prediction markets across Kalshi and Polymarket, holding $1.92B in combined open interest. Day over day, active markets rose 25.4% and open interest rose 6.8% (vs July 10, 2026). Sports was the largest domain by open interest (43%), ahead of Politics & Elections (23%); together they accounted for 67% of all open interest. Kalshi carried 86% of active markets and Polymarket 14%.
Deterministic · template v1 · 2026-07-11
As of 2026-07-11 · 00:00 UTC
Active Markets
248,185
00:00 UTC freeze
Open Interest
$1.92B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
20,383
with trading activity
Kalshi / Polymarket
86% / 14%
by active-market count
Domain Composition — 12 domains
Sports
175,306
Mixed / Multi-category
33,638
Other
23,505
Politics & Elections
6,603
Entertainment & Culture
2,665
Crypto & Digital Assets
1,905
Climate & Weather
1,175
Companies & Business
1,033
Economics & Inflation
899
Technology & AI
476
Monetary Policy
456
World & Geopolitics
429
Science & Health
95
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 = 248,185.
Largest Kalshi Series
Sports — multi-game parlays
152,517
Cross-category multi-markets
33,638
Midterm control
840
Music — artist streams
790
U.S. House races
588
Nextteamnba
434
Pgatour
379
NFL — next team moves
254
Mlbhr
245
California primaries
245
Nextteammlb
219
Nflwins
199
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 July 11, 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 — July 11, 2026.” https://volroc.ai/prediction-markets/2026-07-11/
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