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 J.D. Vance win the 2028 Republican presidential nomination?
39%
Polymarket
Will John N. Kennedy win the 2028 Republican presidential nomination?
0%
Polymarket
Will John Thune win the 2028 Republican presidential nomination?
0%
Polymarket
Will Byron Donalds win the 2028 Republican presidential nomination?
0%
Polymarket
Will Marco Rubio win the 2028 Republican presidential nomination?
18%
Polymarket
Will Tom Cotton win the 2028 Republican presidential nomination?
0%
Change ×
Will Josh Hawley be the nominee for the Presidency for the Republican party?
1%
– 0.0pt
Vol $619 today · $1.7M total
Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.