Kansas City Royals vs. Houston Astros odds: Kalshi vs Polymarket
Wed, Sep 16, 2026, 8:10 PM ET · MLB games · $0 traded in 24h across both venues.
Houston Astros: Kalshi 59¢ vs Polymarket 55¢, +4.5 pp
Mid prices. A price is the market's probability: 59¢ means 59%. 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.
-2.24¢ per $1, after fees
Buy Kansas City Royals @ Kalshi 44¢, Houston Astros @ Polymarket 55¢
All outcomes
| Outcome | Kalshi bid / ask | Polymarket bid / ask | Gap |
|---|---|---|---|
| Kansas City Royals | 43¢ / 44¢ | 45¢ / 46¢ | -2.0 pp |
| Houston Astros | 58¢ / 60¢ | 54¢ / 55¢ | +4.5 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.