Polymarket vs. Kalshi
Compare markets
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.
Possibly the same event, on the other platform
Polymarket
Will the Republican Party hold exactly 56 Senate seats after the 2026 midterm e…
0%
Polymarket
Will the Republican Party hold exactly 53 Senate seats after the 2026 midterm e…
6%
Polymarket
Will the Republican Party hold exactly 48 Senate seats after the 2026 midterm e…
16%
Polymarket
Will the Republican Party hold exactly 51 Senate seats after the 2026 midterm e…
11%
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…
12%
Change ×
Will the Democratic party hold exactly 56 Senate seats in the 121st Congress?
7%
– 0.0pt
Vol $0 today · $2.4K total
Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.