Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) Pick polygram.ink (preferred broker) |
93% | 7% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
93% | 7% | 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 |
|---|---|
| 36°C | 93% |
| 37°C | 8% |
| 38°C | 1% |
| 29°C or below | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 39°C or higher | 0% |
Market context
Shenzhen is in a hot, humid August pattern, and the relevant number for settlement is the *highest reading in Weather Underground’s Daily Observations table* for Shenzhen Bao'an International Airport Station, not the day-high summary. Seasonal normals in the city cluster around the low 30s Celsius, with August averages commonly cited near 32°C and typical highs around 32–33°C, so a result in the 33–37°C band is materially more plausible than a cool day outcome.[3][8][13][19]
The current crowd pricing of 0% for YES appears to be anchored to the market’s existing outcome bands rather than the broader climate backdrop, but historical and comparable August data argue for caution around very low-end expectations. Shenzhen’s August record heat has reached 38°C in prior years, while even ordinary August days often run near 35°C or above in forecasts; recent platform guidance for 10 August 2026 also points to a hot day around 35–37°C, which would keep the settlement firmly in the upper-temperature ranges if confirmed.[2][7][10][16][19]
For traders, the key catalysts are the latest station observations through the settlement window and any short-term changes in cloud cover, thunderstorms, or typhoon-related rain, because those can cap the daily maximum even when the broader forecast looks hot. Weather services were already flagging a warm, cloudy day with some models near 35°C and others near 37°C, while the historical-weather feed for Shenzhen Bao'an showed a midday reading of 95°F, underscoring that the decisive move will come from the station’s later-hour observations rather than the morning setup.[7][9][12][16]
Methodology
Sports-specific comparison page for Highest temperature in Shenzhen on August 10?. 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
- 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.
- 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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