On July 7, 2026, VolRoc recorded 148,075 active prediction markets across Kalshi and Polymarket, holding $2.05B in combined open interest. Day over day, active markets fell 46.8% and open interest fell 15.6% (vs July 6, 2026). Sports was the largest domain by open interest (53%), ahead of Politics & Elections (19%); together they accounted for 72% of all open interest. Kalshi carried 99% of active markets and Polymarket 1%.
Deterministic · template v1 · 2026-07-07
As of 2026-07-07 · 00:00 UTC
Active Markets
148,075
00:00 UTC freeze
Open Interest
$2.05B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
11,164
with trading activity
Kalshi / Polymarket
99% / 1%
by active-market count
Domain Composition — 12 domains
Sports
106,576
Mixed / Multi-category
22,112
Other
11,288
Politics & Elections
3,668
Entertainment & Culture
2,271
Crypto & Digital Assets
642
Economics & Inflation
584
Companies & Business
384
Monetary Policy
290
Climate & Weather
94
Technology & AI
80
World & Geopolitics
55
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 = 148,075.
Largest Kalshi Series
Sports — multi-game parlays
98,618
Cross-category multi-markets
22,112
Midterm control
816
Music — artist streams
795
U.S. House races
588
Nextteamnba
419
Pgatour
335
NFL — next team moves
254
California primaries
245
Nextteammlb
215
Primarymov
204
Nflwins
196
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 7, 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 7, 2026.” https://volroc.ai/prediction-markets/2026-07-07/
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