Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Legal UK) Pick polygram.ink (preferred broker) |
99% | 1% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
99% | 1% | 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 |
|---|---|
| 33°C | 99% |
| 34°C | 1% |
| 29°C or below | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 35°C | 0% |
| 36°C | 0% |
| 37°C | 0% |
| 38°C | 0% |
| 39°C or higher | 0% |
Market context
Shanghai’s highest reading on 4 August will be set by the temperature recorded at Shanghai Pudong International Airport Station on Wunderground, so the relevant question is whether the airport reaches a distinctly hot peak or merely a typical August high. Current forecasts cluster around the low-to-mid 30s Celsius, with one day-ahead view showing about 34°C for Shanghai and another putting 4 August at roughly 33–34°C, which is broadly consistent with August norms rather than an exceptional spike.[2][3][10]
That makes the market read more like a forecast-precision test than a binary weather shock. Comparable August guidance for Shanghai points to daily highs around 31–35°C, with some sources allowing peaks up to 38–40°C in the month, while AccuWeather’s monthly range for August 2026 sits roughly between 82°F and 92°F (about 28–33°C).[1][8][17] The current 0% YES implies the crowd is pricing the selected airport station as very unlikely to print above the threshold needed for the YES band, but this can move quickly if late-morning heat builds or a warm, humid airmass holds through the afternoon.
For accessibility, the market sits in a regulatory zone that matters for platform use rather than the weather itself. In Germany, the GlüStV framework can make even small-stake speculative participation sensitive if a service is treated as gambling-like, while US CFTC reach is relevant where event contracts may be viewed as derivatives or swap-adjacent products. “No-KYC up to $1,500” usually means identity checks are not required until a cumulative activity threshold is hit, so the market may be easy to enter at low size but less straightforward for larger position building or repeated participation. For catalysts, traders should watch the Pudong station’s live Wunderground observations, any Shanghai heat advisories or typhoon-related cloud cover, and the late-morning to afternoon temperature trajectory rather than headline city forecasts alone.
Methodology
This overview of Highest temperature in Shanghai on August 4? 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.
- How are winnings taxed?
- Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.
- 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.
- What if regulation changes?
- If regulation changes in your jurisdiction (e.g. prediction markets are banned), Polymarket Legal UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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