Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) Pick polygram.ink (preferred broker) |
59% | 41% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
59% | 41% | 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 |
|---|---|
| 34°C | 59% |
| 33°C | 31% |
| 35°C | 11% |
| 36°C | 1% |
| 28°C or below | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 37°C | 0% |
| 38°C or higher | 0% |
Market context
Shanghai’s temperature on 7 August will be set by the day’s peak reading at Pudong International Airport, not by city averages, so the market turns on whether the station reaches a typical August high or a hotter-than-normal spike. Long-run August climate guides put Shanghai’s usual daytime maximum around 31–32°C, with humidity and rainfall common, which makes very low buckets harder to justify unless cloud and rain dominate the whole afternoon.[4][6][18]
The current 0% yes pricing looks anchored to the fact that the relevant station-specific forecast is not yet showing an extreme outlier, even though the city remains in a hot spell. AccuWeather’s August outlook has Shanghai’s daily highs around 89–90°F on 7–8 August, and a local report said the Shanghai Meteorological Bureau had issued an orange heatwave alert, with temperatures forecast at 35–38°C and only localised thunderstorms offering relief.[1][7][16] For traders, the main catalysts are any updated airport-station observations, changes in the short-range forecast around midday local time, and whether afternoon convection develops over Pudong rather than the city more broadly.[2][7][10]
Historical framing also matters because Shanghai often sits near the boundary between the low-to-mid 30s Celsius and short-lived heatwave peaks. Forecast services diverge modestly on the exact 7 August high, with some models holding it near 33–35°C and others nearer 35°C, which leaves the upper buckets live if the heatwave verifies and rainfall stays patchy.[3][8][13][15]
Methodology
Sports-specific comparison page for Highest temperature in Shanghai on August 7?. 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.
- Can I bet on individual matches?
- Yes, Polymarket lists every major Premier League / Champions League / World Cup match as its own market. Liquidity varies — top matches like El Clásico or a semi-final often have six-figure pools, lower-league games closer to three-figure.
- 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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