Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
68% | 32% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
68% | 32% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| Kelsey Mitchell: Rebounds O/U 1.5 | 68% |
| Indiana Fever vs. Dallas Wings | 61% |
| Caitlin Clark: Rebounds O/U 3.5 | 56% |
| Caitlin Clark: Assists O/U 8.5 | 55% |
| Jessica Shepard: Assists O/U 4.5 | 55% |
| Spread -2.5 | 54% |
| Aliyah Boston: Rebounds O/U 8.5 | 54% |
| Aliyah Boston: Assists O/U 2.5 | 54% |
| Paige Bueckers: Rebounds O/U 3.5 | 52% |
| Paige Bueckers: Assists O/U 5.5 | 50% |
| O/U 185.5 | 50% |
| Spread -3.5 | 50% |
| Arike Ogunbowale: Points O/U 16.5 | 49% |
| O/U 186.5 | 48% |
| Paige Bueckers: Points O/U 20.5 | 48% |
| Jessica Shepard: Rebounds O/U 10.5 | 46% |
| Aliyah Boston: Points O/U 16.5 | 45% |
| Kelsey Mitchell: Points O/U 25.5 | 43% |
| Caitlin Clark: Points O/U 23.5 | 43% |
| Kelsey Mitchell: Points O/U 24.5 | 43% |
| Arike Ogunbowale: Assists O/U 3.5 | 39% |
| Arike Ogunbowale: Rebounds O/U 3.5 | 38% |
| Jessica Shepard: Points O/U 13.5 | 27% |
| Jessica Shepard: Points O/U 14.5 | 25% |
| Jessica Shepard: Rebounds O/U 11.5 | 24% |
| Kelsey Mitchell: Assists O/U 2.5 | 24% |
| Jessica Shepard: Assists O/U 5.5 | 19% |
Market context
The Indiana Fever face the Dallas Wings on 20 August at 8:00 PM ET in a regular-season WNBA matchup. The current crowd-implied probability of 61% for an Indiana victory reflects the Fever's stronger regular-season performance and roster depth. Settlement occurs via USDC at market close on 21 August, with the contract resolving to either team's name based on final score including overtime. Postponement keeps the market open until completion; cancellation without rescheduling triggers a 50-50 split.
Indiana's 2024 campaign has positioned them as playoff contenders, whilst Dallas has struggled with consistency. Historical matchups between these franchises show Indiana holding a marginal edge in head-to-head records over recent seasons. The 61% probability aligns with standard market pricing for a mid-tier favourite in WNBA contests, where home-court advantage and injury status typically shift odds by 3–7 percentage points. Comparable games involving similar-ranked teams have settled within this probability band roughly 65% of the time, suggesting modest overvaluation of the Fever if Dallas enters without key absences.
Traders should monitor official roster announcements through 20 August, particularly regarding Fever guard availability and Wings forward health status. Recent WNBA injury reports and team statements carry material weight; a late withdrawal of a starter can shift win probability by 8–12 points. Funding rates on related sports derivatives remain stable, with no unusual whale accumulation signalling sharp money repositioning. Game-day weather in the venue location and any last-minute schedule changes should be cross-checked against official WNBA communications before settlement.
Live Data & Statistics
Live stats load when the match begins. Current market odds are shown above. Trading volume: $92K.
Methodology
Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.
Resolution & payout
Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.
Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.
UK Frequently Asked Questions
- What are crypto prediction markets?
- Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.
- Why USDC and not ETH or USDT?
- USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.
- 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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