Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Tax UK) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Trade this market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Trade this market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Trade this market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Trade this market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys | 100% |
| Completed Match | 100% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Set 2 Winner | 100% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Set 2 O/U 8.5 | 100% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Total Sets: O/U 2.5 | 100% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Match O/U 21.5 | 100% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Set 1 O/U 8.5 | 100% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Set 2 O/U 9.5 | 100% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Match O/U 22.5 | 100% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Match O/U 23.5 | 100% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Set 1 Winner | 0% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Set Handicap +/-1.5 | 0% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Set 1 O/U 9.5 | 0% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Set Handicap +/-1.5 | 0% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Set 2 O/U 10.5 | 0% |
| Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys Set 1 O/U 10.5 | 0% |
Market context
The Mubadala Citi DC Open is a WTA 500 hardcourt tournament held annually in Washington, DC. Samsonova and Keys are scheduled to meet on 27 July 2026 at 10:00 AM ET. The market currently prices Samsonova's advancement at 9%, implying Keys is heavily favoured. Settlement occurs on 3 August 2026 at 14:00 UTC, allowing a week for the match to conclude; any cancellation, tie, or unresolved outcome beyond that window triggers a 50-50 split.
Samsonova's win probability reflects her recent form relative to Keys. Samsonova reached a career-high ranking of 8 in 2023 but has experienced ranking volatility, whilst Keys has maintained steadier top-20 positioning and holds a 2–1 head-to-head record against Samsonova. On hardcourts specifically, Keys' consistency and serve strength have historically favoured her against Samsonova's more variable performance. The 9% implied probability suggests market participants view this as a clear Keys matchup, though Samsonova's occasional high-level performances—particularly on hard surfaces—mean upsets remain within normal variance.
Traders should monitor injury reports and withdrawal announcements in the fortnight preceding the tournament. WTA scheduling changes and surface-specific preparation weeks can affect player readiness; both players' performance at preceding events (likely ATP/WTA events in late July) will signal form entering Washington. Tournament draws and seeding will be announced approximately one week before play begins, potentially shifting market expectations if either player receives an unexpected bye or faces a challenging path.
Methodology
This overview of Mubadala Citi DC Open: Liudmila Samsonova vs Madison Keys reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.
Resolution & payout
On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.
FAQ
- Do I need to KYC for Polymarket Tax UK?
- Not for lifetime trading volume under $1,500. Above that threshold, a quick KYC flow kicks in — ID, selfie, approximately 5-10 minutes. The threshold matches FATF travel standards for unregulated crypto platforms.
- How are winnings taxed?
- Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.
- What happens during a tax audit?
- You're responsible for documenting your trades. Polymarket Tax UK exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- Are prediction markets gambling?
- Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.
- Is there a withdrawal cap?
- No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).
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