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 |
|---|---|
| 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 **highest temperature** on 4 August is being set by the day’s peak reading at Shenzhen Bao’an International Airport Station, which is the value this market will resolve against. The latest public forecasts for the city point to a hot, humid, and often showery day, with Guangdong’s official 24-hour forecast putting Shenzhen at **25–29°C** under overcast conditions[5], while other August outlooks cluster around highs in the low 30s Celsius[2][4][10][17].
The current **0% YES** price is best read as a warning that the market is not pricing in a meaningful chance of an unusually high airport reading, not as a statement that the day cannot reach the upper end of forecast ranges. In similar Shenzhen summer setups, the key issue is whether cloud, rain, or typhoon-adjacent moisture suppresses the afternoon peak; August climatology is hot but volatile, with frequent rain and average highs around the low 30s[2][4][10][17]. That matters for market interpretation because a single station-based maximum can undershoot citywide forecasts if storms arrive early or if the warmest part of the day is brief.
For accessibility, the regulatory frame is the practical one: a German user’s access can be affected by the GlüStV gambling regime if the platform or activity is treated as regulated betting, while US persons face separate CFTC and jurisdictional issues because event contracts can fall into a derivatives grey zone depending on venue and structure. A “**no-KYC up to $1,500**” limit means smaller balances may be usable with lighter identity checks, but it does not remove AML, sanctions, or residency screening, so the market may be technically open while still gating some users by region or account history. The main live catalyst is the local weather evolution between now and the settlement window, especially any official rain, thunderstorm, or tropical-weather updates that would narrow the day’s ceiling[5][7][16].
Methodology
This overview of Highest temperature in Shenzhen on August 4? 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 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.
- 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), Polymarket Legal UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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