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 Gavin Newsom announce a run for President of the United States before Mar 1, 2027?
Vol $0 today · $601 total
Will Gavin Newsom be the next leader out before 2027?
Vol $9.9K today · $55.7K total
Kalshi is 27 points higher than Polymarket (27% vs 0%). They resolve on different dates (Mar 1 vs Jan 1), 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.
| Kalshi | Polymarket | |
|---|---|---|
| Probability (Yes) | 27% | 0% |
| Change (24h) | -0.5 pt | +0.1 pt |
| Volume today | $0 | $9.9K |
| Total volume | $601 | $55.7K |
| Liquidity | — | $24.1K |
| Open interest | $601 | — |
| Resolves | 4mo | 65d |
| Tracked for | 15 days | 15 days |
Resolution rules: read both before trusting a gap
Kalshi
If Gavin Newsom has announced that he will run for President of the United States in 2028 before Mar 1, 2027, including running for the nomination of any political party to contest that office, then the market resolves to Yes.
Polymarket
This market will resolve according to the first listed individual who ceases to occupy their listed office. An announcement of a resignation/removal, or a scheduled departure from office due to the outcome of an election, will not alone qualify. Only permanent removal from office will qualify for resolution. Temporary removals, such as impeachment suspensions (e.g., Yoon Suk Yeol's recent impeachment), temporary invocation of the 25th Amendment, or any similar provisional transfers of power, will not count. Additionally, if an individual continues in a caretaker or interim role (e.g., Gabriel Attal remaining as caretaker Prime Minister of France), they will not be considered to have ceased occupying the office for the purposes of this market. If this criterion has not been met for any of the listed individuals by December 31, 2026, 11:59 PM ET, this market will resolve to “None before 2027”. No additional individuals will be added to this market after its creation. The resolution source for this market will be a consensus of credible reporting.
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Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.