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 Luca Niculescu be the next Prime Minister of Romania?
Vol $99.1K today · $520.6K total
Will Kyriakos Mitsotakis become Prime Minister of Greece following the next Greek general election?
Vol $217 today · $1.4K total
Polymarket is 29 points higher than Kalshi (100% vs 71%). Polymarket trades about 456.8× more volume today, so its price has more money behind it. They resolve on different dates (Dec 31 vs Jul 25), 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) | 100% | 71% |
| Change (24h) | +8.6 pt | -4.0 pt |
| Volume today | $99.1K | $217 |
| Total volume | $520.6K | $1.4K |
| Liquidity | $70.6K | — |
| Open interest | — | $1.4K |
| Resolves | 71d | 21mo |
| Tracked for | 7 days | 11 days |
Resolution rules: read both before trusting a gap
Polymarket
This market will resolve to the next individual who officially assumes the office of Prime Minister of Romania by December 31, 2027, 11:59 PM ET. To count for resolution, the individual must be formally appointed by the President of Romania and receive a vote of confidence from Parliament, resulting in the official formation of a new government. Any interim or caretaker Prime Minister who does not receive a parliamentary vote of confidence will not count toward the resolution of this market. If no such Prime Minister takes office by December 31, 2027, 11:59 PM ET, this market will resolve to “Other”. The primary resolution source for this market will be official information from the Government of Romania; however, a consensus of credible reporting may also be used.
Kalshi
If Kyriakos Mitsotakis becomes Prime Minister of Greece as a result of government formation following the next Greek general election and meets all constitutional requirements before Jul 25, 2028, 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.