Noche UFC: Jessie Rosas vs. Sean King (Featherweight, Prelims) odds: Kalshi vs Polymarket
Sat, Sep 12, 2026, 2:00 PM ET · UFC fights · $26k traded in 24h across both venues.
Sean King: Kalshi 63¢ vs Polymarket 65¢, -1.5 pp
Mid prices. A price is the market's probability: 63¢ means 63%. The gap is Kalshi minus Polymarket in percentage points.
Two separate exchanges, two accounts. Links may carry a referral code, which never changes what is shown. Disclosures.
-3.15¢ per $1, after fees
Buy Sean King @ Kalshi 64¢, Jessie Rosas @ Polymarket 36¢
All outcomes
| Outcome | Kalshi bid / ask | Polymarket bid / ask | Gap |
|---|---|---|---|
| Sean King | 62¢ / 64¢ | 64¢ / 65¢ | -1.5 pp |
| Jessie Rosas | 36¢ / 38¢ | 35¢ / 36¢ | +1.5 pp |
Price history, last 3 days
How this is matched
Games are matched across the two exchanges by league, team codes and date. Polymarket prices come from its live order book, Kalshi from its public API. Refreshed every 45 seconds.
What this is not
Read-only. Nothing here places or routes orders and nothing is advice. Fees, slippage and the time it takes to move money between venues are not in these numbers.