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 Samuel Alito announce his retirement by June 30, 2027?
54%
– 0.5pt
Vol $1.2K today · $165.6K total
Possibly the same event, on the other platform
Kalshi
Will Mike Evans announce his retirement before the 2029-30 NFL season?
51%
Kalshi
Will Kirk Cousins announce his retirement before the 2029-30 NFL season?
55%
Kalshi
Will Mike Evans announce his retirement before the 2027-28 NFL season?
52%
Kalshi
Will Max Verstappen announce his retirement before the 2029 F1 season?
46%
Kalshi
Will Max Verstappen announce his retirement before the 2030 F1 season?
61%
Kalshi
Will Mike Evans announce his retirement before the 2028-29 NFL season?
51%
Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.