Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Prediction Today) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Set 1 Winner | 100% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Set 2 O/U 8.5 | 100% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Match O/U 21.5 | 100% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Set 2 O/U 9.5 | 100% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Set 2 O/U 10.5 | 100% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Match O/U 23.5 | 100% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Match O/U 22.5 | 99% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Total Sets: O/U 2.5 | 75% |
| Completed Match | 50% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez | 18% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Set Handicap +/-1.5 | 1% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Set 1 O/U 8.5 | 0% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Set 2 Winner | 0% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Set 1 O/U 9.5 | 0% |
| Cincinnati Open: Daria Kasatkina vs Zeynep Sonmez Set 1 O/U 10.5 | 0% |
Market context
Daria Kasatkina faces Zeynep Sonmez in the Cincinnati Open's opening round on 13 August 2026. The 18% implied probability for Kasatkina's advancement reflects substantial uncertainty despite her higher ranking and experience at WTA 1000 events. Recent form and court conditions will determine whether the Russian player's technical game translates effectively on the hard courts of Cincinnati, where surface-specific preparation becomes decisive in early rounds.
Kasatkina's record against lower-ranked opponents has shown inconsistency over the past two seasons, particularly in tournaments where she lacks momentum from prior rounds. Sonmez, competing at this level, represents the type of qualifier or lower-seeded player who occasionally produces upset performances at Cincinnati. Historical patterns at the event show that seeding advantage typically holds in opening matches, yet the 18% probability suggests the market is pricing in either recent injury concerns, scheduling complications, or Sonmez's specific tactical strengths against Kasatkina's style.
Traders should monitor official Cincinnati Open draws and any withdrawal announcements through to the settlement window closing on 20 August. Court assignments and match scheduling—particularly whether this fixture occurs as scheduled or faces delays—will clarify the resolution path. Kasatkina's participation in warm-up events immediately preceding Cincinnati and any reported physical issues will signal confidence levels in her readiness. Sonmez's recent results on hard courts and her performance history against top-50 opponents provide the most concrete indicators of competitive likelihood.
Methodology
This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Today, which mirrors the Polymarket order book directly.
Resolution & payout
Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.
Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.
UK Frequently Asked Questions
- What's the difference between YES and NO shares?
- A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.
- What does Polymarket cost to trade?
- Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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