House control market on Kalshi exceeds $150 million in volume
Kalshi's market on which party wins the House had passed 150 million dollars in trading volume by October 30, and Kalshi did almost 18 million dollars on the Texas Senate race in October's first 20 days against about 3.7 million on Polymarket US. Polymarket counters with breadth, offering more than 560 midterm markets down to ballot measures and local races.
House trading clears $150 million
Kalshi’s market on which party will win control of the House had exceeded $150 million in trading volume by October 30, according to Oddschecker. The figure highlights the scale of activity in a single congressional-control market ahead of the midterms.
Oddschecker’s report, published Oct 31, 2026, at 5:30 AM ET, also points to a contrast between the platforms: substantial trading in prominent Kalshi contests alongside a broad range of midterm markets on Polymarket.
Texas volume and market breadth
In October’s first 20 days, Kalshi recorded almost $18 million in trading on the Texas Senate race, compared with about $3.7 million on Polymarket US, according to Oddschecker. That puts Kalshi’s reported volume for the race at nearly five times the Polymarket US figure over the same period.
Polymarket’s offering spans more than 560 midterm markets, according to Oddschecker, extending beyond major contests to ballot measures and local races. That market count provides a different measure of platform activity from the dollar volumes reported for Kalshi.
What it means for prediction markets
- Volume and breadth measure different things. Kalshi’s House and Texas Senate figures show trading activity in specific markets; Polymarket’s more than 560 markets describe the range of available contests.
- The Texas comparison is time-bound. The almost $18 million versus about $3.7 million figures cover October’s first 20 days, not the full month.
- These figures do not establish election probabilities. The reported volumes and market count do not indicate which party or candidate traders favor.
Sources & attribution
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