Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Who Will Win) Pick polygram.ink (preferred broker) |
94% | 6% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
94% | 6% | 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 | 94% |
| 37°C | 6% |
| 29°C or below | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 38°C | 0% |
| 39°C or higher | 0% |
Market context
Shenzhen’s highest temperature on 10 August looks priced as a near-lock at **0% YES**, so the crowd is effectively assuming the reading will land in a temperature band well above the threshold that matters for this market. On Weather Underground’s Shenzhen history page, the morning observations already showed **89°F at 8:00 AM** and **94°F at 11:00 AM**, which translates to roughly **31.7°C and 34.4°C** respectively, with the day’s recorded high already sitting in the mid-30s Celsius by late morning.[5] That leaves the favourite firmly with the hotter outcome, while the underdog is any lower band that would require a material break from the recent pattern.
The historical and comparable read is also tilted towards heat. Shenzhen’s August climatology is firmly tropical-monsoonal: August averages around **32°C / 89°F** with warm nights and frequent humidity, and recent historical snapshots show daytime highs commonly in the **mid-to-upper 30s °C**.[7][8][18] Time and Date’s recent history for the previous day showed a **99°F** peak on 9 August, while Weather Underground’s own August history gives a typical high around **94°F** and a record of **92°F** on the page’s historical summary, underlining that elevated readings are normal enough to make a low-band upset expensive at this price.[2][5] On that basis, the consensus is clearly for a strong positive print, and the only obvious value angle is contrarian upside if a forecast change or coastal cooling caps the airport station below expectations.
For catalysts, traders should watch the airport-station observations through the Chinese afternoon, because the market settles on the **highest temperature recorded at Shenzhen Bao’an International Airport Station** and the **Daily Observations** table is the binding source if anything conflicts with the summary section.[5] Forecast pages from AccuWeather and Time and Date both point to a hot day, with highs around **97°F / 36°C** and only modest shower risk, so the main dependency is whether cloud cover, sea breeze or convective rain trims the peak before local midday-to-afternoon heating.[11][17] The important detail is that the settlement window ends at **12:00 UTC**, so any late-day heat after that point is irrelevant even if the broader daily high ends up higher.[5]
Methodology
This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win, which mirrors the Polymarket order book directly.
Resolution & payout
Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.
Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.
UK Frequently Asked Questions
- Is this market available outside the US?
- Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.
- How does resolution work?
- Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.
- 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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