Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Who Will Win) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
100% | 0% | 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 | 100% |
| 28°C or below | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 36°C | 0% |
| 37°C | 0% |
| 38°C or higher | 0% |
Market context
Shenzhen’s hottest reading today is likely to come in around the mid-30s Celsius rather than anything extreme, with the official Guangdong city forecast calling for **Shenzhen 27–34°C** and local warning text flagging a hot spell with possible thunderstorms and a high of **36°C or above** under the edge of Typhoon “White Dolphin”.[6][15] Against that backdrop, the market’s **0% implied probability** for the top band looks like a heavy **underdog** price: the consensus sits in the lower-to-mid 30s, while the value question is whether a brief spike, not the whole-day average, can push the Daily Observations table into a higher range.[6][15]
Historically, Shenzhen in August is a heat-and-humidity city, with typical highs around **31–35°C** and occasional days near **35°C** in travel and climate references, which makes a hot outcome structurally plausible even when rain is in the mix.[3][8][13][17] The favourite, in market terms, is the ordinary hot-but-not-searing range, while the contrarian angle is that late-morning or early-afternoon heating can still produce a single reading above the broader forecast if cloud cover breaks. That said, the settlement depends on the **highest** observation at Shenzhen Bao'an International Airport Station on the day, so a short-lived extreme matters more than the headline day high.[6][15]
The main catalysts are the evolution of the typhoon-related subsidence flow, the timing of any showers or thunderstorms, and whether the airport station gets a brief clear-sky heating window before convection builds.[15][18] Traders should also watch for any updated municipal or provincial weather notices and whether the 24-hour forecast tightens upward from the current **34°C** official cap; morning forecast refreshes often matter most when the market is still open. On current information, consensus is clustered around a standard hot-day print, while the value spot is the small tail risk of a localised burst of heat that the station records but the broader public forecast does not fully capture.[6][15][18]
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
- Where can I trade this market with the lowest fees?
- Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- 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%.
Trade Highest temperature in Shenzhen on August 7? on Who Will Win
Live order book, 0% fees, USDC settlement in seconds.
Open live market →