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 $9K today · $121.9K total
Kalshi is 56 points higher than Polymarket (80% vs 24%). Polymarket trades about 3.1× more volume today, so its price has more money behind it. They resolve on different dates (Jan 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) | 24% | 80% |
| Change (24h) | -3.5 pt | +0.0 pt |
| Volume today | $28K | $9K |
| Total volume | $109.6K | $121.9K |
| Liquidity | $7.2K | — |
| Open interest | — | $66.9K |
| Resolves | 14mo | 68d |
| Tracked for | 3 days | 15 days |
Resolution rules: read both before trusting a gap
Polymarket
This market will resolve to "Yes" if there is a widely reported coup attempt in Iran at any point between market creation and December 31, 2027, 11:59 PM ET. Otherwise, this market will resolve to "No." A coup attempt is defined as a coordinated and deliberate effort by military, security forces, or other state actors (or factions thereof) to overthrow or unlawfully seize control of the Iranian government or its leadership. Revolutionary actions by non-state forces, isolated protests, or general unrest will not alone qualify. Claims by the Iranian government that a coup attempt was foiled—such as through arrests or disruption of a planned operation—will only count toward a "Yes" resolution if credible independent sources widely report and explicitly characterize the event as a coup attempt. Foiled plots or arrests that occur without any attempted execution of the coup will not qualify. The resolution source will be a consensus of credible reporting.
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.