Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Tax UK) Pick polygram.ink (preferred broker) |
92% | 8% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
92% | 8% | 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 | 92% |
| 32°C | 8% |
| 23°C or below | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 33°C or higher | 0% |
Market context
The underlying event is the **highest temperature recorded at Shenzhen Bao'an International Airport** on 3 August, measured by the market’s resolution source rather than by citywide averages. Shenzhen is in its hottest, most humid period in early August, and local climate guides consistently put typical August highs around **32–34°C**, so outcomes below or above that band are materially possible depending on cloud cover, rainfall and sea-breeze effects.[11][12][7]
The current **0% YES** crowd-implied probability should be read against a market that is still highly event-driven and can move sharply once morning heating, convective rain, or a typhoon track becomes clearer. Comparable Shenzhen August climate references show a wide spread between average highs and occasional extreme readings, with historical guides noting record temperatures well above the seasonal mean, which is why “highest temperature” contracts often settle near the middle of the daily forecast range rather than at an obvious extreme.[10][11][12]
From a regulatory and access angle, the practical issue is not the weather itself but who can trade and on what terms. In Germany, the GlüStV framework can affect whether a user is treated as eligible to access or participate in such a market, while US CFTC reach matters because prediction markets can face US derivatives-style scrutiny even when the underlying event is non-financial; for accessibility, “no-KYC up to $1,500” generally means a user may be able to trade or withdraw only within that cumulative threshold before identity checks are triggered, which can affect how easily a small retail position can be placed in this specific market.
Methodology
This overview of Highest temperature in Shenzhen on August 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
- 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.
- 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.
- 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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