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's summer temperatures in mid-July typically peak between 32–35°C, with occasional spikes above 36°C during heat waves. The city's subtropical monsoon climate produces consistent high humidity and afternoon thunderstorms during this period, which can suppress peak temperatures. Historical data from Bao'an International Airport, the official settlement source, shows July 19th has recorded highs ranging from 31°C to 34°C over the past decade, with no extreme outliers recorded on that specific date.
The 0% crowd probability reflects the market's early stage and thin liquidity rather than meteorological certainty. Comparable weather markets on this platform typically see probability shifts only when seasonal forecasts update or when traders recognise systematic bias in historical ranges. The settlement window closes at noon UTC on July 19th, 2026, which aligns with Wunderground's daily high-temperature reporting convention—a critical detail, as morning-only closures would exclude afternoon peaks when Shenzhen typically records its maximum.
From a regulatory standpoint, this weather derivative falls outside German GlüStV gaming licensing requirements because it references objective meteorological data rather than sporting outcomes. US CFTC jurisdiction over prediction markets remains unsettled, though weather derivatives themselves are established financial instruments. UK traders accessing this market through polymarket-tax.co.uk should note that positions under £1,500 typically avoid KYC friction on many platforms, though individual broker policies vary. No forecast updates from the China Meteorological Administration are scheduled before settlement, meaning traders rely on historical patterns and real-time atmospheric monitoring rather than official announcements.
Methodology
This overview of Highest temperature in Shenzhen on July 19? 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.
- Can I trade anonymously?
- Pseudonymously, yes — up to the KYC threshold. Polymarket Tax 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 Tax 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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