On July 22, 2026, VolRoc recorded 182,016 active prediction markets across Kalshi and Polymarket, holding $1.52B in combined open interest. Day over day, active markets rose 5.2% and open interest rose 5.0% (vs July 21, 2026). Sports was the largest domain by open interest (43%), ahead of Politics & Elections (30%); together they accounted for 73% of all open interest. Kalshi carried 78% of active markets and Polymarket 22%.
Deterministic · template v1 · 2026-07-22
As of 2026-07-22 · 00:00 UTC
Active Markets
182,016
00:00 UTC freeze
Open Interest
$1.52B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
22,418
with trading activity
Kalshi / Polymarket
78% / 22%
by active-market count
Domain Composition — 12 domains
Sports
119,301
Other
27,230
Mixed / Multi-category
19,230
Politics & Elections
6,424
Entertainment & Culture
2,576
Crypto & Digital Assets
1,962
Companies & Business
1,219
Climate & Weather
1,194
Technology & AI
971
Economics & Inflation
858
World & Geopolitics
507
Monetary Policy
462
Science & Health
82
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 = 182,016.
Largest Kalshi Series
Sports — multi-game parlays
95,985
Cross-category multi-markets
19,230
Midterm control
884
Music — artist streams
766
U.S. House races
594
Nextteamnba
449
Mlbhr
265
NFL — next team moves
254
Nextteammlb
224
Nflwins
220
Mlbteamtotal
198
Flprimary
194
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 22, 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 22, 2026.” https://volroc.ai/prediction-markets/2026-07-22/
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