Polymarket vs. Kalshi
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See where the two biggest prediction markets disagree. Pick any two markets, or start from the biggest gaps below: prices, volume, history and the resolution rules, side by side.
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Will the Democratic party hold exactly 51 Senate seats in the 121st Congress?
6%
▼ 5.0pt
Vol $38 today · $10.4K total
Possibly the same event, on the other platform
Polymarket
Will the Republican Party hold exactly 51 Senate seats after the 2026 midterm e…
8%
Polymarket
Will the Republican Party hold exactly 49 Senate seats after the 2026 midterm e…
12%
Polymarket
Will the Republican Party hold exactly 50 Senate seats after the 2026 midterm e…
13%
Polymarket
Will the Republican Party hold exactly 53 Senate seats after the 2026 midterm e…
5%
Polymarket
Will the Republican Party hold exactly 48 Senate seats after the 2026 midterm e…
16%
Polymarket
Will the Republican Party hold exactly 54 Senate seats after the 2026 midterm e…
2%
Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.