Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via March Madness Predictions) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | See live odds → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | See live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | See live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | See live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | See live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| Spread -5.5 | 100% |
| Spread -6.5 | 100% |
| Kahleah Copper: Points O/U 18.5 | 100% |
| Awa Fam: Points O/U 11.5 | 100% |
| Alyssa Thomas: Rebounds O/U 6.5 | 100% |
| Awa Fam: Rebounds O/U 5.5 | 100% |
| Kahleah Copper: Rebounds O/U 3.5 | 100% |
| Flau'jae Johnson: Assists O/U 2.5 | 100% |
| Spread -4.5 | 100% |
| Spread -3.5 | 100% |
| Alyssa Thomas: Assists O/U 8.5 | 50% |
| Natisha Hiedeman: Points O/U 14.5 | 50% |
| Flau'jae Johnson: Rebounds O/U 5.5 | 10% |
| Seattle Storm vs. Phoenix Mercury | 0% |
| O/U 167.5 | 0% |
| O/U 166.5 | 0% |
| O/U 168.5 | 0% |
| Dominique Malonga: Points O/U 17.5 | 0% |
| Natisha Hiedeman: Points O/U 15.5 | 0% |
| Alyssa Thomas: Points O/U 14.5 | 0% |
| Flau'jae Johnson: Points O/U 12.5 | 0% |
| Dominique Malonga: Rebounds O/U 8.5 | 0% |
| Flau'jae Johnson: Rebounds O/U 4.5 | 0% |
| Natisha Hiedeman: Assists O/U 4.5 | 0% |
| Dominique Malonga: Points O/U 18.5 | 0% |
| O/U 169.5 | 0% |
Market context
The real-world event is a WNBA matchup on July 2 at 10:00PM ET between the Seattle Storm and Phoenix Mercury, where the Storm must win to resolve the market as "Seattle Storm". Current crowd-implied probability of 0% YES reflects the Storm’s dire form: they have lost 10 consecutive games, including a 93–73 rout by the Mercury on June 20, which ended the Phoenix team’s own four-game skid [1][4]. Historically, such extended losing streaks in the WNBA rarely reverse without a catalyst; comparable cases from 2022–2024 show teams with 8+ straight losses winning only 12% of subsequent games, often requiring a coaching adjustment or key player return to break the pattern [1].
Traders should monitor two immediate catalysts: first, any announcement regarding Seattle’s injury list, particularly if star guard Jewell Loyd (who missed the June 20 game) is declared fit, and second, the Mercury’s rotation stability, as Valériane Ayayi’s career-high 18-point performance last time may be unsustainable if she faces defensive pressure [1][4]. Action Network notes the Mercury are favoured by -3.5 with a moneyline of -175, underscoring their home-court advantage at the Mortgage Matchup Centre [2]. No major coaching changes have been reported yet, but the Storm’s 5–15 record versus the Mercury’s 7–13 suggests a structural gap that will persist unless Seattle addresses its defensive lapses, which allowed 85.4 points per game this season [2][6]. The settlement window ends 2026-07-03, so any postponement will keep the market open until completion.
Live Data & Statistics
Live stats load when the match begins. Current market odds are shown above. Trading volume: $219K.
Methodology
Sports-specific comparison page for Seattle Storm vs. Phoenix Mercury. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.
Resolution & payout
Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.
FAQ
- Are prediction markets better than sports betting?
- Prediction markets tend toward tighter odds than bookmakers because they use peer-to-peer exchange rather than bookmaker margin. On major matches, Polymarket quotes typically sit 2-5% closer to the true probability model than bet365 or DraftKings.
- When do sports markets resolve?
- Typically within hours of the official final whistle. Polymarket uses UMA Optimistic Oracle with source URLs pointing at official league data feeds — e.g. the Premier League for EPL markets, UEFA for Champions League, FIFA for World Cup.
- Which sports markets are available?
- Football (soccer) dominates — Champions League, World Cup, Premier League, La Liga, Bundesliga — followed by NFL, NBA, tennis Grand Slams, Formula 1, boxing/MMA. Resolution via official league source confirmation.
- How fast do sports winnings settle?
- Once the official league outcome is logged in the UMA Oracle (typically 1-2 hours after the final whistle), Polymarket's smart contract triggers USDC payout. To your wallet within minutes.
- Can I import form data and lineups?
- This page shows the live Polymarket quote as an implied probability. Form data and lineups must be researched separately via sports data providers (e.g. Soccerway, ESPN, FBref) — we surface the market probability, not the sport analysis.
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