Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via March Madness Predictions) Pick polygram.ink (preferred broker) |
97% | 3% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | See live odds → |
Polymarket (direct) polymarket.com |
97% | 3% | 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 |
|---|---|
| 27°C | 97% |
| 23°C or below | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C or higher | 0% |
Market context
Chengdu’s airport station has a late-July climate that usually sits in the low 30s Celsius, with the historical July average high around 30°C and the airport’s July record high reaching 35.7°C, so a market pinned at 0% YES is only justified if traders expect an unusually subdued day rather than a normal summer peak.[11][3][14] Nearby historical guides for the city point to typical July highs around 30–35°C, which puts the settlement range in a band that is common enough to be meaningful but high enough that small forecast errors can matter.[12][18]
For context, the most useful comparable cases are hot-season days in Chengdu when the airport briefly surges above the monthly average after a run of humid, stagnant weather, with highs in the mid-30s not exceptional in the broader record.[3][12] Because the market settles on the highest reading at Chengdu Shuangliu International Airport Station, the key historical lens is not the city average but the station’s own daily extreme, which means traders should treat any forecast in the low 30s as still compatible with a higher intraday spike if sunshine appears late or cloud cover clears.[11][6]
The main catalysts are the short-range forecast for Chengdu, the timing of any rain bands or thunderstorm clusters, and whether the airport station reports a late-afternoon maximum rather than an earlier, cooler reading.[12][9] With settlement based on Wunderground history for the airport station, any update to the local forecast track matters more than general provincial weather commentary, especially if humidity and cloud cover shift after midday and allow a brief temperature pop.[6][9]
Methodology
Sports-specific comparison page for Highest temperature in Chengdu on July 31?. 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.
- 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.
- 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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