On August 5, 2026, VolRoc recorded 173,299 active prediction markets across Kalshi and Polymarket, holding $1.36B in combined open interest. Day over day, active markets rose 18.9% and open interest rose 6.6% (vs August 4, 2026). Politics & Elections was the largest domain by open interest (36%), ahead of Sports (34%); together they accounted for 70% of all open interest. Kalshi carried 89% of active markets and Polymarket 11%.
Deterministic · template v1 · 2026-08-05
As of 2026-08-05 · 00:00 UTC
Active Markets
173,299
00:00 UTC freeze
Open Interest
$1.36B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
17,393
with trading activity
Kalshi / Polymarket
89% / 11%
by active-market count
Domain Composition — 12 domains
Sports
95,817
Mixed / Multi-category
44,268
Other
18,983
Politics & Elections
6,252
Entertainment & Culture
2,619
Crypto & Digital Assets
1,431
Economics & Inflation
989
Technology & AI
965
Companies & Business
930
Monetary Policy
396
World & Geopolitics
372
Climate & Weather
201
Science & Health
76
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 = 173,299.
Largest Kalshi Series
Sports — multi-game parlays
79,454
Cross-category multi-markets
44,268
Midterm control
959
Music — artist streams
747
U.S. House races
606
Nextteamnba
489
Mlbhr
315
Nflwins
282
Mlbhit
273
NFL — next team moves
257
Mlbhrr
220
Flprimary
206
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 August 5, 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 — August 5, 2026.” https://volroc.ai/prediction-markets/2026-08-05/
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