Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Tax 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 |
|---|---|
| 31°C | 100% |
| 25°C or below | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C or higher | 0% |
Market context
Shenzhen will experience its peak daytime heat on 21 July 2026 at the Bao’an International Airport weather station, with the market resolving to the Celsius range containing that day’s highest recorded temperature. The current 0% YES probability implies the crowd expects the temperature to fall outside the specific range offered, though July in this coastal Guangdong city routinely sees highs between 32°C and 36°C, often pushed higher by humidity and limited cloud cover [1][2].
Historical July peaks at ZGSZ frequently breach 35°C, with comparable 2024 and 2025 days recording 36.2°C and 35.8°C respectively under similar overcast-to-thunderstorm conditions; the 0% figure likely reflects a mismatch between the offered range and these established norms rather than an expectation of unusually cool weather [2]. Traders should monitor the daily Wunderground history for the Bao’an station as the settlement window closes, watching for real-time announcements on thunderstorm timing that could suppress peak temperatures, as forecasts indicate a 90% precipitation chance and temperatures peaking near 31°C (88°F) if storms arrive early [2].
Regulatory access hinges on jurisdiction: German GlüStV restrictions may block participation for residents unless the platform holds a state licence, while US CFTC reach extends to any trader accessing the market from American soil regardless of KYC status. The ‘no-KYC up to $1,500’ threshold means this weather market remains accessible to unverified users within that limit, bypassing identity checks but not exempting them from underlying tax or reporting obligations in their home country.
Methodology
This overview of Highest temperature in Shenzhen on July 21? 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 Tax UK 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.
- What happens during a tax audit?
- You're responsible for documenting your trades. Polymarket Tax UK exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- 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), Polymarket Tax UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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