Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) Pick polygram.ink (preferred broker) |
73% | 27% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
73% | 27% | 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 | 73% |
| 36°C | 18% |
| 37°C | 13% |
| 38°C | 1% |
| 31°C or below | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 39°C | 0% |
| 40°C | 0% |
| 41°C or higher | 0% |
Market context
Chengdu's highest temperature on 11 August 2026 will be measured at Shuangliu International Airport Station and resolved against the Daily Observations table on Weather Underground, which serves as the authoritative source over summary figures. The market currently shows 0% implied probability across all temperature ranges, suggesting either insufficient trader participation or genuine uncertainty about which bracket will contain the day's peak reading.
August in Chengdu typically brings sustained heat, with historical records showing daily highs regularly exceeding 35°C during this period. The city's inland location in Sichuan Province and its geographical position in a basin contribute to heat retention. Comparable August days from previous years provide the clearest reference point: examining Shuangliu station data from August 2023 and 2024 reveals peak temperatures in the 35–38°C range were common, though occasional days pushed toward 39–40°C. The 0% probability across all ranges suggests traders may be awaiting confirmation of the specific temperature brackets offered before committing positions.
Weather forecasting accuracy for single-day temperature peaks at a specific location typically improves significantly within two weeks of the target date. Traders should monitor meteorological forecasts from late July onwards, particularly any alerts from China's National Meteorological Centre regarding heat waves or unusual pressure systems affecting central China. The resolution mechanism's reliance on the Daily Observations table rather than summary figures means the precise timing of the day's warmest reading becomes material—afternoon peaks are standard, but unusual patterns could affect which bracket captures the maximum.
Methodology
Sports-specific comparison page for Highest temperature in Chengdu on August 11?. 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.
UK Frequently Asked Questions
- 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.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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