On August 14, 2026, VolRoc recorded 147,218 active prediction markets across Kalshi and Polymarket, holding $1.42B in combined open interest. Day over day, active markets fell 10.6% and open interest was little changed (vs August 13, 2026). Politics & Elections was the largest domain by open interest (36%), ahead of Sports (32%); together they accounted for 68% of all open interest. Kalshi carried 91% of active markets and Polymarket 9%.
Deterministic · template v1 · 2026-08-14
As of 2026-08-14 · 00:00 UTC
Active Markets
147,218
00:00 UTC freeze
Open Interest
$1.42B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
15,668
with trading activity
Kalshi / Polymarket
91% / 9%
by active-market count
Domain Composition — 12 domains
Sports
62,643
Mixed / Multi-category
53,526
Other
17,340
Politics & Elections
6,226
Entertainment & Culture
2,704
Crypto & Digital Assets
1,361
Technology & AI
892
Economics & Inflation
845
Companies & Business
716
Monetary Policy
403
World & Geopolitics
299
Climate & Weather
187
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 = 147,218.
Largest Kalshi Series
Cross-category multi-markets
53,526
Sports — multi-game parlays
50,602
Midterm control
1,068
Music — artist streams
734
U.S. House races
612
Nextteamnba
506
Nflspread
391
Nfltotal
321
Nflwins
317
Ncaafwins
237
NFL — next team moves
230
Flprimary
211
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 14, 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 14, 2026.” https://volroc.ai/prediction-markets/2026-08-14/
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