China Open: Mai Hontama vs Katie Boulter odds, Sep 30: Kalshi vs Polymarket
Katie Boulter 69% on Kalshi, 69% on Polymarket. Both exchanges' prices for every outcome of China Open: Mai Hontama vs Katie Boulter, Sep 30, $26k traded in 24 hours, updated every 45 seconds.
Wed, Sep 30, 2026, 3:30 AM ET · WTA tennis matches · $26k traded in 24h across both venues
Katie Boulter: Kalshi $0.69 vs Polymarket $0.69, $0.00
Mid prices, in dollars on a contract that pays $1 if it happens: $0.69 is a 69% chance. The gap is Kalshi minus Polymarket.
Two separate exchanges, two accounts. Links may carry a referral code, which never changes what is shown. Disclosures.
All outcomes
| Outcome | Kalshi bid / ask | Polymarket bid / ask | Gap, + = Kalshi higher |
|---|---|---|---|
| Mai Hontama | $0.32 / $0.33 | $0.31 / $0.32 | +$0.01 |
| Katie Boulter | $0.68 / $0.70 | $0.68 / $0.69 | $0.00 |
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.