On July 3, 2026, VolRoc recorded 225,891 active prediction markets across Kalshi and Polymarket, holding $2.36B in combined open interest. Day over day, active markets rose 26.9% and open interest rose 7.6% (vs July 2, 2026). Sports was the largest domain by open interest (52%), ahead of Politics & Elections (16%); together they accounted for 68% of all open interest. Kalshi carried 99% of active markets and Polymarket 1%.
Deterministic · template v1 · 2026-07-03
As of 2026-07-03 · 00:00 UTC
Active Markets
225,891
00:00 UTC freeze
Open Interest
$2.36B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
12,755
with trading activity
Kalshi / Polymarket
99% / 1%
by active-market count
Domain Composition — 12 domains
Sports
171,439
Mixed / Multi-category
35,164
Other
11,392
Politics & Elections
3,632
Entertainment & Culture
2,240
Crypto & Digital Assets
569
Economics & Inflation
563
Companies & Business
349
Monetary Policy
283
Climate & Weather
95
Technology & AI
80
World & Geopolitics
55
Science & Health
30
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 = 225,891.
Largest Kalshi Series
Sports — multi-game parlays
162,399
Cross-category multi-markets
35,164
Midterm control
799
Music — artist streams
793
U.S. House races
588
Nextteamnba
461
NFL — next team moves
254
Pgatour
245
California primaries
241
Nextteammlb
210
Primarymov
203
Nflwins
190
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 3, 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 3, 2026.” https://volroc.ai/prediction-markets/2026-07-03/
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