Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) Pick polygram.ink (preferred broker) |
90% | 10% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
90% | 10% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 35°C | 90% |
| 36°C | 11% |
| 37°C | 1% |
| 29°C or below | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 38°C | 0% |
| 39°C or higher | 0% |
Market context
Shanghai's summer temperatures in late July typically range between 32–36°C, with occasional peaks exceeding 37°C during heat waves. The city experiences its hottest period from mid-July through August, driven by the East Asian summer monsoon and urban heat island effects. Historical data from Shanghai Pudong International Airport shows that temperatures on 25 July have varied considerably year to year, influenced by whether tropical systems approach the region or high-pressure systems dominate.
The 0% implied probability reflects uncertainty about which specific temperature band will be recorded rather than doubt that measurable heat will occur. Comparable July dates at the airport station have produced highs ranging from 29°C during cooler, wetter years to 38°C during intense heat episodes. The settlement depends entirely on Wunderground's historical records for the Pudong station, which maintains consistent measurement protocols. Traders should note that the exact temperature bracket thresholds determine the outcome; a reading of 35.2°C versus 35.8°C could shift resolution between adjacent ranges.
Monitoring weather forecasts from mid-July onwards will be essential, particularly tracking whether the western Pacific typhoon season produces systems that could cool Shanghai or whether continental high-pressure systems intensify heat. The China Meteorological Administration issues seasonal outlooks that occasionally signal whether late July will trend warmer or cooler than the 30-year average. Settlement occurs at 12:00 UTC on 25 July, giving traders access to actual recorded temperatures from the airport station by that deadline.
Methodology
Sports-specific comparison page for Highest temperature in Shanghai on July 25?. 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.
- What are live sports odds on Polymarket?
- Some top-tier matches stay open during play — you can trade the half-time probability in the 70th minute. Polymarket mid-prices update second-by-second; any frontend mirroring the order book shows the same movement.
- 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.
- 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.
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