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.
Will Donald Trump announce a run for President of the United States before Nov 7, 2028?
Vol $32 today · $66K total
Will Donald Trump win the 2028 Republican presidential nomination?
Vol $450 today · $9.7M total
Kalshi is 13 points higher than Polymarket (15% vs 2%). Polymarket trades about 14.1× more volume today, so its price has more money behind it.
History starts when we first saw each market, so a newly added market has a short line.
| Kalshi | Polymarket | |
|---|---|---|
| Probability (Yes) | 15% | 2% |
| Change (24h) | -1.5 pt | +0.0 pt |
| Volume today | $32 | $450 |
| Total volume | $66K | $9.7M |
| Liquidity | — | $356.7K |
| Open interest | $19.7K | — |
| Resolves | 25mo | 25mo |
| Tracked for | 10 days | 10 days |
Resolution rules: read both before trusting a gap
Kalshi
If Donald Trump has announced that he will run for President of the United States in 2028 before Nov 7, 2028, including running for the nomination of any political party to contest that office, then the market resolves to Yes.
Polymarket
This market will resolve to “Yes” if the named individual wins and accepts the 2028 nomination of the Republican Party for U.S. president. Otherwise, this market will resolve to “No”. The resolution source for this market will be a consensus of official Republican Party sources. Any replacement of the Republican nominee before election day will not change the resolution of the market.
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Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.