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 |
|---|---|
| 36°C | 100% |
| 30°C or below | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 37°C | 0% |
| 38°C | 0% |
| 39°C | 0% |
| 40°C or higher | 0% |
Market context
Shanghai’s daytime high at Pudong Airport on 2 August will almost certainly land in the market’s upper summer bands rather than the cooler tails, because early August in Shanghai is climatologically hot, humid and often rain-affected. Independent climate datasets put typical August highs around the low 30s Celsius, with average highs near 32°C and common daily ranges in the high 20s to mid-30s°C, while historic extremes can push much higher in heatwave conditions.[3][6][9]
That makes the current **0% YES** crowd price look like a defensive read on tail risk rather than a call on ordinary weather. For context, Shanghai has posted severe August heat before, including a 39.5°C city record in August 2025 and an all-time 41°C peak in 2013, so a very hot reading is not outside historical precedent even if it is uncommon.[2][4][6] The relevant comparison for settlement is the *station maximum at Pudong Airport*, which can differ from downtown readings and may be tempered by coastal influence, cloud cover or rainfall on the day.[1][10]
For traders, the main catalysts are the daytime forecast updates, any typhoon-related track changes, and the timing of convective rain or cloud breaks that can cap the afternoon maximum. Shanghai is in the East Asian monsoon and typhoon season in August, so a late shift in wind, rainfall or storm proximity can materially alter the daily high even when morning temperatures start warm.[7][14] On access, a German-facing platform may trigger **GlüStV**-linked checks because weather markets are still gambling-like under a broad regulatory lens, while US traders should remember that the **CFTC’s reach** is mainly about whether the venue permits access from US persons rather than the weather itself. In practical terms, **“no-KYC up to $1,500”** means a user can usually open and trade within that lifetime limit with only light identity checks, but the market remains available only to accounts the venue permits under its country and compliance rules.
Methodology
This overview of Highest temperature in Shanghai on August 2? 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
- 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.
- 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).
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