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 |
|---|---|
| 29°C | 100% |
| 24°C or below | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C or higher | 0% |
Market context
Shenzhen is experiencing a hot, sunny day with temperatures around 31°C and a RealFeel of 40°C, driven by high humidity and strong UV levels, setting the stage for the July 20 highest-temperature event at Bao’an International Airport. The market currently shows 0% probability for any outcome above 29°C, yet the frontrunner is locked at 29°C with 100% implied probability, suggesting the crowd expects a ceiling near that threshold despite current conditions exceeding it [1][2].
Historically, Shenzhen’s July highs at Bao’an typically range between 32°C and 36°C, with 29°C representing an unusually cool outlier; past years show no recorded July 20 maximum below 31°C, making the 0% YES probability for higher ranges appear misaligned with climatic norms. This discrepancy mirrors earlier weather markets where early-season data skewed probabilities before mid-month heatwaves corrected them, framing the current 0% as a potential mispricing rather than a settled consensus.
Traders should monitor Wunderground’s daily update for ZGSZ at 12:00Z on July 21, which will determine settlement, and watch for any sudden shifts in humidity or cloud cover that could suppress peak temperatures. A recent AccuWeather hourly forecast indicates showers with a 70% precipitation chance in the coming hours, a catalyst that could lower the day’s maximum if sustained [3]. Regulatory clarity remains critical: under Germany’s GlüStV, prediction markets face strict licensing, while the US CFTC asserts reach over unregistered platforms, though “no-KYC up to $1,500” allows accessible participation for this market without identity verification, provided local laws permit it.
Methodology
This overview of Highest temperature in Shenzhen on July 20? 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
- Do I need to KYC for Polymarket Tax 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 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.
- 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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