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 Donald Trump endorse Marco Rubio in the 2028 presidential election before Mar 1, 2028?
26%
▲ +1.5pt
Vol $51 today · $13.7K total
Possibly the same event, on the other platform
Polymarket
Will Donald Trump win the 2028 US Presidential Election?
1%
Polymarket
Will Marco Rubio win the 2028 US Presidential Election?
9%
Polymarket
Will Donald Trump Jr. win the 2028 US Presidential Election?
1%
Polymarket
Will Marco Rubio win the 2028 Republican presidential nomination?
15%
Polymarket
Will Ivanka Trump win the 2028 US Presidential Election?
1%
Polymarket
Will Donald Trump win the 2028 Republican presidential nomination?
2%
Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.