On July 10, 2026, VolRoc recorded 197,952 active prediction markets across Kalshi and Polymarket, holding $1.80B in combined open interest. Day over day, active markets fell 9.1% and open interest fell 3.3% (vs July 9, 2026). Sports was the largest domain by open interest (40%), ahead of Politics & Elections (25%); together they accounted for 65% of all open interest. Kalshi carried 83% of active markets and Polymarket 17%.
Deterministic · template v1 · 2026-07-10
As of 2026-07-10 · 00:00 UTC
Active Markets
197,952
00:00 UTC freeze
Open Interest
$1.80B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
20,139
with trading activity
Kalshi / Polymarket
83% / 17%
by active-market count
Domain Composition — 12 domains
Sports
135,783
Other
23,650
Mixed / Multi-category
22,802
Politics & Elections
6,544
Entertainment & Culture
2,605
Crypto & Digital Assets
1,998
Climate & Weather
1,177
Companies & Business
1,011
Economics & Inflation
909
Technology & AI
485
Monetary Policy
447
World & Geopolitics
428
Science & Health
113
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 = 197,952.
Largest Kalshi Series
Sports — multi-game parlays
113,204
Cross-category multi-markets
22,802
Midterm control
833
Music — artist streams
789
U.S. House races
588
Pgatour
456
Nextteamnba
428
NFL — next team moves
254
KXPGATOP20
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 10, 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 10, 2026.” https://volroc.ai/prediction-markets/2026-07-10/
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