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 the Federal Reserve hike rates by December 31, 2026?
Vol $8.6K today · $111.7K total
Polymarket is 5 points higher than Kalshi (84% vs 80%). Kalshi trades about 83.6× more volume today, so its price has more money behind it. They resolve on different dates (Nov 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.
| Polymarket | Kalshi | |
|---|---|---|
| Probability (Yes) | 84% | 80% |
| Change (24h) | -0.5 pt | -2.0 pt |
| Volume today | $103 | $8.6K |
| Total volume | $822 | $111.7K |
| Liquidity | $979 | — |
| Open interest | — | $57K |
| Resolves | 9d | 70d |
| Tracked for | 10 days | 14 days |
Resolution rules: read both before trusting a gap
Polymarket
This market will resolve to “Yes” if Russia targets Kyiv through a qualifying military action on the specified date, Kyiv time. Otherwise, this market will resolve to “No.” A qualifying military action refers to an air strike or a surface-to-surface missile strike, initiated by Russia, directed at Kyiv. An air strike includes bombs, air-to-surface missiles, and air-launched drones. A surface-to-surface missile strike includes one-way attack drones and surface-to-surface missiles such as cruise or ballistic missiles. The following actions do not constitute a qualifying military action: Surface-to-air missile strikes; Small-arms fire; Ground incursions; Cyber operations; Naval gunfire and artillery fire; Howitzers, artillery pieces, mortars, and rocket artillery (e.g. MLRS systems); Minor surface-to-surface strikes, including short range loitering munitions, FPV drones, and ATGM strikes; Any threat, authorization, or announcement of force that has not been executed. Military action that consists primarily or exclusively of munitions that are intercepted before impact will still qualify if they constitute a qualifying military action during the specified timeframe; whether the munitions were intercepted, where the munitions landed, and whether damage resulted will not be considered. A military action will be considered directed at Kyiv if it targets any location within the ci…
Kalshi
If the Federal Reserve announces an increase in the target range or target level for the federal funds rate after market Issuance and on or before Dec 31, 2026, 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.