On July 1, 2026, VolRoc recorded 223,456 active prediction markets across Kalshi and Polymarket, holding $2.28B in combined open interest. Day over day, active markets rose 15.7% and open interest rose 0.7% (vs June 30, 2026). Sports was the largest domain by open interest (50%), ahead of Politics & Elections (17%); together they accounted for 67% of all open interest. Kalshi carried 99% of active markets and Polymarket 1%.
Deterministic · template v1 · 2026-07-01
As of 2026-07-01 · 00:00 UTC
Active Markets
223,456
00:00 UTC freeze
Open Interest
$2.28B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
12,765
with trading activity
Kalshi / Polymarket
99% / 1%
by active-market count
Domain Composition — 12 domains
Sports
169,178
Mixed / Multi-category
35,107
Other
11,198
Politics & Elections
3,676
Entertainment & Culture
2,233
Crypto & Digital Assets
607
Economics & Inflation
593
Companies & Business
292
Monetary Policy
284
Climate & Weather
104
Technology & AI
87
World & Geopolitics
66
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 = 223,456.
Largest Kalshi Series
Sports — multi-game parlays
159,969
Cross-category multi-markets
35,107
Music — artist streams
799
Midterm control
792
U.S. House races
588
Nextteamnba
394
Mlbhr
265
NFL — next team moves
254
California primaries
240
Pgatour
234
Primarymov
229
Nextteammlb
208
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 1, 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 1, 2026.” https://volroc.ai/prediction-markets/2026-07-01/
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