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 Republican Party hold exactly 53 Senate seats after the 2026 midterm elections?
4%
▼ 1.6pt
Vol $8.2K today · $160.1K total
Possibly the same event, on the other platform
Kalshi
Will the Democratic party hold exactly 53 Senate seats in the 121st Congress?
12%
Kalshi
Will the Democratic party hold exactly 56 Senate seats in the 121st Congress?
7%
Kalshi
Will the Democratic party hold exactly 55 Senate seats in the 121st Congress?
7%
Kalshi
Will the Democratic party hold exactly 54 Senate seats in the 121st Congress?
8%
Kalshi
Will the Democratic party hold more than 56 Senate seats in the 121st Congress?
12%
Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.