Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via March Madness Predictions) Pick polygram.ink (preferred broker) |
0% | 100% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | See live odds → |
Polymarket (direct) polymarket.com |
0% | 100% | 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 → |
Market context
SPY is trading close to the upper end of its recent range, which is why the market’s **77% YES** probability implies the ETF is expected to finish higher than the prior session rather than merely stay elevated. Recent quotes in the sources put SPY around **$748–$750** intraday, with a prior close around **$748.28**, while the broader historical record shows a late-June closing high of **$757.62** and a 52-week high of **$760.40**.[3][5]
That pricing context matters because one-day SPY direction is often driven less by long-run trend than by whether the underlying index can hold through the final hours of trading. With the settlement based on the **July 22 close** versus the most recent prior trading day’s close, traders are watching the usual late-session catalysts: a heavy scheduled macro calendar, Treasury yields, and any move in mega-cap names that dominate the S&P 500’s weighting. The intraday quote gap between sources also suggests the market is still being repriced in real time rather than sitting on a fixed level.[1][2][3]
For a probability this high to cash, SPY needs only a modest positive close, but the main risk is a late reversal rather than a large sell-off. The relevant comparison is with recent trading around the mid-740s to high-740s, not with the June peak; if the ETF loses ground into the close, the outcome flips quickly because the market is resolved against the previous session’s close, not against a multi-day average.[3][5]
Methodology
Sports-specific comparison page for SPY (SPY) Up or Down on July 22?. 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.
- What's the difference between match odds and outright odds?
- Match odds cover a single game ("Bayern beats BVB"). Outright odds are long-term aggregates ("Bayern wins the league"). Outright markets have deeper liquidity; match markets have faster resolution.
- 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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