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.
Next White House Press Secretary announced by December 31, 2026?
Vol $32.8K today · $32.7K total
Will Katie Zacharia be out as White House Press Secretary before Jan 1, 2028?
Vol $4.6K today · $6K total
Kalshi is 17 points higher than Polymarket (100% vs 83%). Polymarket trades about 7.1× 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) | 83% | 100% |
| Change (24h) | +33.0 pt | +0.0 pt |
| Volume today | $32.8K | $4.6K |
| Total volume | $32.7K | $6K |
| Liquidity | $71.9K | — |
| Open interest | — | $4.8K |
| Resolves | 74d | 15mo |
| Tracked for | 46 hours | 5 days |
Resolution rules: read both before trusting a gap
Polymarket
This market will resolve to "Yes" if Donald Trump or the Trump administration announces a new White House Press Secretary to replace Katie Zacharia between market creation and the specified date, 11:59 PM ET. Otherwise, this market will resolve to "No". An individual announced as an acting or interim Press Secretary will not qualify toward this market's resolution. Any qualifying announcement made within this market's time frame will count, regardless of when the new Press Secretary is sworn in or begins serving. This market's primary resolution source will be official information from the Trump administration; however, a consensus of credible reporting may also be used.
Kalshi
If Katie Zacharia leaves as White House Press Secretary before Jan 1, 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.