Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Legal UK) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Trade this market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Trade this market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Trade this market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Trade this market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 37°C | 100% |
| 31°C or below | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 36°C | 0% |
| 38°C | 0% |
| 39°C | 0% |
| 40°C | 0% |
| 41°C or higher | 0% |
Market context
The event is the **highest air temperature** recorded at Shanghai Pudong International Airport on 1 August, measured in Celsius and resolved against Weather Underground’s daily history page. Shanghai’s August climate is normally hot and humid, with average highs around the low 30s Celsius and a published August record high of 40.0°C in one long-run climate summary, so a sub-zero crowd price implies the market is treating an extreme-heat outcome as very unlikely rather than impossible.[1][5][8]
That reading is consistent with how temperature markets usually price: the hard part is not whether Shanghai can reach the mid-30s, but whether the airport station sees a clear spike above the usual August range. Recent reporting has shown Shanghai and eastern China repeatedly flirting with heat alerts and record-level warmth, including a 2024 Reuters report on China’s hottest month in recent history and Shanghai municipal reporting on record August heat, which are the kinds of comparables traders use when calibrating tail risk.[3][7][17] For a British-facing prediction market audience, the regulatory frame matters too: a market on weather is ordinarily outside the core scope of gambling-style content under Germany’s GlüStV concerns, but accessibility can still be affected by platform-level geoblocking and compliance controls in Germany, while any US-facing participation remains sensitive to CFTC jurisdictional reach if the venue or users are within its scope. “No-KYC up to $1,500” means a user can usually trade without identity verification until cumulative activity crosses that threshold, which improves access for small positions but does not change withdrawal or account-review obligations.[19]
The main catalysts are operational, not political: the daily maximum at Shanghai Pudong International Airport will be determined by the local weather sequence, especially any afternoon convection, sea-breeze suppression, or typhoon-related cloud and rain bands that cap heating. Traders should watch the airport station’s Wunderground history page once the local day is under way, together with official Shanghai heat alerts and any major forecast updates from the China Meteorological Administration or reputable forecasters if a hot ridge builds over eastern China, since those can quickly move expectations for the day’s eventual high.[5][6][12]
Methodology
This overview of Highest temperature in Shanghai on August 1? reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.
Resolution & payout
On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.
FAQ
- Is Polymarket legal in my country?
- Polymarket is geo-blocked in the US/UK/EU. Actual usage via the Polymarket interface is not possible there. The legal status itself varies — many countries treat prediction markets as a gray area. Polymarket Legal UK has a different geo footprint.
- Do I need to KYC for Polymarket Legal UK?
- Not for lifetime trading volume under $1,500. Above that threshold, a quick KYC flow kicks in — ID, selfie, approximately 5-10 minutes. The threshold matches FATF travel standards for unregulated crypto platforms.
- Can I trade anonymously?
- Pseudonymously, yes — up to the KYC threshold. Polymarket Legal UK stores an email address and wallet addresses rather than a legal name. Over $1,500 lifetime volume triggers KYC, after which identity is no longer anonymous.
- What happens during a tax audit?
- You're responsible for documenting your trades. Polymarket Legal UK exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- Are prediction markets gambling?
- Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.
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