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 Oh Se-hoon win the next South Korean presidential election?
Vol $30 today · $142 total
Will Teddy Riner win the 2027 French presidential election?
Vol $311.7K today · $310.9K total
Kalshi is 11 points higher than Polymarket (14% vs 2%). Polymarket trades about 10389.6× more volume today, so its price has more money behind it. They resolve on different dates (Mar 27 vs Apr 19), 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) | 14% | 2% |
| Change (24h) | +0.0 pt | +2.3 pt |
| Volume today | $30 | $311.7K |
| Total volume | $142 | $310.9K |
| Liquidity | — | $329.4K |
| Open interest | $107 | — |
| Resolves | 53mo | 5mo |
| Tracked for | 14 days | 32 days |
Resolution rules: read both before trusting a gap
Kalshi
If Oh Se-hoon wins the next South Korean presidential election, then the market resolves to Yes.
Polymarket
The next French presidential election is currently expected to be held around April 2027. This market pertains to the outcome of the next French presidential election, regardless of whether it follows the scheduled end of the current term or is held earlier. The President of France is elected via a two-round system; a candidate must secure over 50% of the vote to win outright in the first round. If no candidate achieves this, the top two contenders advance to a runoff. This market will resolve according to the candidate who wins this election. This market includes any potential second round. If, for any reason, the results of the election are not known by December 31, 2027, 11:59 PM ET, this market will resolve to "Other". This market will resolve based on the result of the election as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the French Government, specifically the Ministry of the Interior (https://www.interieur.gouv.fr/).
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Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.