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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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Kalshi

Will the S&P 500 be above 9000 on Dec 31, 2027 at 4pm EST?

35% – 0.5pt

Vol $4 today · $2.2K total

Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.