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 |
|---|---|
| 33°C | 100% |
| 24°C or below | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 34°C or higher | 0% |
Market context
The underlying event is the daily peak temperature at Shanghai Pudong International Airport on 3 July 2026, measured in degrees Celsius and sourced from Wunderground. Current crowd-implied probability for a specific outcome sits at 0%, yet the market frontrunner is 31°C at 42%, with 30°C trailing at 32%, suggesting the zero probability reflects a specific binary threshold rather than a lack of heat[1]. Historical data confirms July is Shanghai’s hottest month, with daytime averages typically exceeding 30°C and often reaching 35°C, while the warmest day in July 2026 is projected to hit 32.5°C[4][9]. Notably, 3 July is climatologically the coldest day in the first ten days of July, with a historical average of 24.3°C, creating a divergence between seasonal highs and this specific date’s typical coolness[8].
Traders should monitor thundery shower forecasts and subtropical humidity levels, as recent BBC reports indicate light rain and thundery showers for Hongqiao Airport on 3 July, which could suppress peak temperatures at Pudong[3]. Persistent subtropical conditions are driving overnight lows into the 24–26°C range, a factor that may limit daytime peaks if cloud cover persists[5]. Regulatory accessibility remains a key catalyst: German GlüStV implications and US CFTC reach define the legal perimeter, while the “no-KYC up to $1,500” threshold allows immediate participation for smaller bets without identity verification, enhancing liquidity for this specific weather market[1]. Recent climate guides confirm July weather is hot and humid, with temperatures ranging from 32°C to higher extremes, making the 31°C frontrunner a statistically plausible outcome despite the 0% binary probability[10].
Methodology
This overview of Highest temperature in Shanghai on July 3? 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.
- 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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