On August 6, 2026, VolRoc recorded 158,383 active prediction markets across Kalshi and Polymarket, holding $1.33B in combined open interest. Day over day, active markets fell 8.6% and open interest fell 2.4% (vs August 5, 2026). Politics & Elections was the largest domain by open interest (37%), ahead of Sports (33%); together they accounted for 70% of all open interest. Kalshi carried 89% of active markets and Polymarket 11%.
Deterministic · template v1 · 2026-08-06
As of 2026-08-06 · 00:00 UTC
Active Markets
158,383
00:00 UTC freeze
Open Interest
$1.33B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
17,364
with trading activity
Kalshi / Polymarket
89% / 11%
by active-market count
Domain Composition — 12 domains
Sports
76,790
Mixed / Multi-category
48,957
Other
18,492
Politics & Elections
6,234
Entertainment & Culture
2,646
Crypto & Digital Assets
1,422
Economics & Inflation
1,010
Technology & AI
966
Companies & Business
835
Monetary Policy
394
World & Geopolitics
372
Climate & Weather
189
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 = 158,383.
Largest Kalshi Series
Sports — multi-game parlays
61,770
Cross-category multi-markets
48,957
Midterm control
979
Music — artist streams
743
U.S. House races
605
Nextteamnba
492
Nflwins
283
NFL — next team moves
257
Mlbhr
243
Flprimary
207
Joinclub
206
Nextteammlb
201
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 6, 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 6, 2026.” https://volroc.ai/prediction-markets/2026-08-06/
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