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 a Republican win in 2028 AND the 2029 S&P 500 change be 20% or above?
8%
▲ +0.7pt
Vol $580 today · $580 total
Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.