On October 6, 2026, VolRoc recorded 234,498 active prediction markets across Kalshi and Polymarket, holding $835.0M in combined open interest. Day over day, active markets fell 5.6% and open interest rose 13.9% (vs October 5, 2026). Politics & Elections was the largest domain by open interest (32%), ahead of Sports (12%); together they accounted for 44% of all open interest. Kalshi carried 89% of active markets and Polymarket 11%.
Deterministic · template v1 · 2026-10-06
As of 2026-10-06 · 00:00 UTC
Active Markets
234,498
00:00 UTC freeze
Open Interest
$835.0M
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
10,991
with trading activity
Kalshi / Polymarket
89% / 11%
by active-market count
Domain Composition — 12 domains
Mixed / Multi-category
203,033
Sports
12,475
Other
9,753
Politics & Elections
5,196
Crypto & Digital Assets
1,245
Technology & AI
755
World & Geopolitics
666
Entertainment & Culture
370
Companies & Business
314
Economics & Inflation
289
Climate & Weather
225
Monetary Policy
129
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 = 234,498.
Largest Kalshi Series
Cross-category multi-markets
192,221
KXMVECROSSCATEGORY0
10,812
Ncaafspread
298
Ncaaftotal
192
Nflspread
136
Btcd
109
Nhlgoal
96
Mlbhrr
76
Mlbhr
74
Nflrec
73
Mlbhit
66
Nhltotal
63
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 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 — October 6, 2026.” https://volroc.ai/prediction-markets/2026-10-06/
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