On October 11, 2026, VolRoc recorded 396,367 active prediction markets across Kalshi and Polymarket, holding $1.24B in combined open interest. Day over day, active markets rose 12.7% and open interest fell 50.0% (vs October 10, 2026). Politics & Elections was the largest domain by open interest (22%), ahead of Sports (7%); together they accounted for 29% of all open interest. Kalshi carried 94% of active markets and Polymarket 6%.
Deterministic · template v1 · 2026-10-11
As of 2026-10-11 · 00:00 UTC
Active Markets
396,367
00:00 UTC freeze
Open Interest
$1.24B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
10,235
with trading activity
Kalshi / Polymarket
94% / 6%
by active-market count
Domain Composition — 12 domains
Mixed / Multi-category
366,119
Sports
12,130
Other
9,168
Politics & Elections
5,160
Crypto & Digital Assets
1,122
Technology & AI
754
World & Geopolitics
666
Entertainment & Culture
361
Companies & Business
310
Economics & Inflation
260
Climate & Weather
141
Monetary Policy
128
Science & Health
48
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 = 396,367.
Largest Kalshi Series
Cross-category multi-markets
311,955
KXMVECROSSCATEGORY0
54,164
Nflrec
252
Nhlgoal
246
Nfltd
134
Nflrecyds
122
Nhlpts
111
Nflrshyds
111
Nflffpts
99
Nbaspread
88
Btcd
73
Ncaawvmatch
69
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 October 11, 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 — October 11, 2026.” https://volroc.ai/prediction-markets/2026-10-11/
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