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 |
|---|---|
| NRFI | 100% |
| 1st 5 Innings O/U 2.5 | 100% |
| 1st 5 Innings O/U 3.5 | 100% |
| 1st 5 Innings O/U 4.5 | 100% |
| 1st 5 Innings O/U 5.5 | 100% |
| O/U 7.5 | 95% |
| Spread -1.5 | 92% |
| O/U 8.5 | 91% |
| Spread -2.5 | 86% |
| 1st 5 Innings O/U 6.5 | 85% |
| O/U 9.5 | 82% |
| Spread -4.5 | 73% |
| O/U 10.5 | 73% |
| 1st 5 Innings Spread -1.5 | 69% |
| Spread -5.5 | 63% |
| O/U 11.5 | 61% |
| Spread -6.5 | 52% |
| Extra Innings | 50% |
| Spread -7.5 | 50% |
| O/U 12.5 | 48% |
| O/U 13.5 | 39% |
| 1st 5 Innings Spread -1.5 | 11% |
| Seattle Mariners vs. Milwaukee Brewers | 5% |
| Spread -1.5 | 3% |
| Spread -2.5 | 1% |
Market context
The Mariners travel to Milwaukee on 20 August for an afternoon fixture against the Brewers, with the settlement window extending through 27 August to account for any postponement. The 5% implied probability for a Seattle victory reflects the Brewers' recent competitive standing and home-field advantage, though the market has compressed considerably from earlier projections given roster developments across both clubs.
Milwaukee enters August with a stronger divisional record and has maintained consistency in run prevention despite mid-season bullpen adjustments. Seattle's pitching depth has been tested by injuries, and the club's offensive production against top-tier starters has remained inconsistent through July. Historical matchups between these franchises over the past three seasons show the Brewers winning 55% of contests, a marginal edge that aligns with current market pricing but understates the significance of venue and recent form shifts.
Traders should monitor lineup confirmations through 19 August, particularly regarding Seattle's availability in the outfield and Milwaukee's rotation assignment. The Brewers' recent acquisition activity and any late-inning bullpen adjustments will influence game dynamics; beat reporters covering the Brewers have noted manager Craig Counsell's preference for deploying high-leverage relievers earlier in close contests. Weather conditions in Milwaukee on game day—historically favourable to fly-ball pitchers—warrant attention given both teams' reliance on specific relief profiles. Any roster moves announced in the 48 hours before first pitch could shift the probability meaningfully.
Live Data & Statistics
Live stats load when the match begins. Current market odds are shown above. Trading volume: $391K.
Methodology
Sports-specific comparison page for Seattle Mariners vs. Milwaukee Brewers. 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.
- Can I bet on individual matches?
- Yes, Polymarket lists every major Premier League / Champions League / World Cup match as its own market. Liquidity varies — top matches like El Clásico or a semi-final often have six-figure pools, lower-league games closer to three-figure.
- 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.
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