Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
60% | 40% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
60% | 40% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Go to the live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Go to the live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Go to the live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Go to the live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 32°C | 60% |
| 31°C | 31% |
| 33°C | 3% |
| 25°C or below | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 34°C | 0% |
| 35°C or higher | 0% |
Market context
Shanghai's highest temperature on 15 August 2026 will be recorded at Pudong International Airport Station and measured in degrees Celsius. The resolution will draw from Weather Underground's Daily Observations table rather than its Day High & Low summary, a distinction that matters when hourly readings diverge from the daily peak reported in secondary displays. The 0% crowd probability suggests traders currently perceive no meaningful chance of an extreme heat event on that specific date, though Shanghai's August climate regularly produces temperatures in the 32–35 °C range.
Historical August temperatures at Shanghai Pudong show a 30-year mean high of 32.2 °C, with extremes reaching 38.9 °C in 2013. The current zero probability likely reflects baseline seasonal expectations rather than any forecasting consensus; mid-August typically falls within the city's monsoon season, which can suppress peak temperatures through cloud cover and precipitation. Comparable markets on Shanghai summer heat have resolved across a wide band, indicating that even modest deviations from the 32–35 °C norm carry meaningful resolution uncertainty.
From a regulatory standpoint, this market's accessibility depends on jurisdiction. Under Germany's GlüStV framework, prediction markets on weather events face classification as gambling unless operated under specific exemptions; traders in Germany should verify their platform's licensing. US CFTC oversight applies to derivatives on weather indices, though binary prediction markets on discrete events occupy a grey zone. Platforms offering no-KYC access up to $1,500 USD typically do so under retail exemptions or offshore registration; this market's low nominal stakes keep it within that threshold, though traders should confirm their own regulatory status before participation.
Methodology
This overview of Highest temperature in Shanghai on August 15? 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. Is Kalshi Legal in California has a different geo footprint.
- 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.
- Is there a withdrawal cap?
- No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).
- What if regulation changes?
- If regulation changes in your jurisdiction (e.g. prediction markets are banned), Is Kalshi Legal in California would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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