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 Kamala Harris win the 2028 Democratic presidential nomination?
Vol $71.7K today · $14.1M total
Will the Democratic party win the House, the Democratic party win the Senate, and the Democratic party win the Presidency?
Vol $98 today · $124.9K total
Kalshi is 42 points higher than Polymarket (49% vs 7%). Polymarket trades about 732.5× more volume today, so its price has more money behind it. They resolve on different dates (Nov 8 vs Nov 7), so they may not be exactly the same bet.
History starts when we first saw each market, so a newly added market has a short line.
| Polymarket | Kalshi | |
|---|---|---|
| Probability (Yes) | 7% | 49% |
| Change (24h) | +0.1 pt | +2.5 pt |
| Volume today | $71.7K | $98 |
| Total volume | $14.1M | $124.9K |
| Liquidity | $401.5K | — |
| Open interest | — | $65.5K |
| Resolves | 25mo | 37mo |
| Tracked for | 9 days | 9 days |
Resolution rules: read both before trusting a gap
Polymarket
This market will resolve to “Yes” if the named individual wins and accepts the 2028 nomination of the Democratic Party for U.S. president. Otherwise, this market will resolve to “No”. The resolution source for this market will be a consensus of official Democratic Party sources. Any replacement of the democratic nominee before election day will not change the resolution of the market.
Kalshi
If the Democratic party wins the House, the Democratic party wins the Senate, and the Democratic party wins the Presidency in the 2028 election, then the market resolves to Yes.
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Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.