On October 2, 2026, VolRoc recorded 342,600 active prediction markets across Kalshi and Polymarket, holding $2.29B in combined open interest. Day over day, active markets rose 10.6% and open interest rose 4.6% (vs October 1, 2026). Politics & Elections was the largest domain by open interest (25%), ahead of Sports (17%); together they accounted for 43% of all open interest. Kalshi carried 92% of active markets and Polymarket 8%.
Deterministic · template v1 · 2026-10-02
As of 2026-10-02 · 00:00 UTC
Active Markets
342,600
00:00 UTC freeze
Open Interest
$2.29B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
23,325
with trading activity
Kalshi / Polymarket
92% / 8%
by active-market count
Domain Composition — 12 domains
Mixed / Multi-category
271,932
Other
26,357
Sports
25,639
Politics & Elections
10,024
Entertainment & Culture
3,086
Crypto & Digital Assets
1,364
Economics & Inflation
1,030
Technology & AI
840
Companies & Business
788
World & Geopolitics
696
Monetary Policy
501
Climate & Weather
263
Science & Health
80
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 = 342,600.
Largest Kalshi Series
Cross-category multi-markets
220,295
KXMVECROSSCATEGORY0
51,637
Midterm control
1,653
Votegeneral
1,424
U.S. House races
671
Music — artist streams
624
Ncaafspread
623
Nflwins
437
Ncaafwins
434
Nextteamnba
426
Midtermvoteturn
365
Nfltd
359
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 2, 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 2, 2026.” https://volroc.ai/prediction-markets/2026-10-02/
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