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 |
|---|---|
| 34°C | 100% |
| 26°C or below | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 35°C | 0% |
| 36°C or higher | 0% |
Market context
The outcome depends on the highest temperature recorded at Chengdu Shuangliu International Airport on 3 August 2026, so the practical question is whether the airport station prints a daily max that lands in the relevant range on Wunderground. Chengdu’s August climate is normally hot, humid and rain-affected, with long-run guides putting typical daytime highs around 30–32°C and occasional forecasts above that, while current market pricing at 0% YES suggests traders are treating an extreme or narrow-band result as very unlikely.[2][5][9][14]
The historical framing is that Chengdu often sits close to the low-30s in early August, but with enough humidity and rainfall to cap the upside unless there is a brief heat spike or localised föhn-like effect; comparable forecasts for 3 August in 2026 cluster from about 29–33°C, with some sources projecting 35°C or higher in the city rather than specifically at the airport station.[2][3][4][6][15] For market reading, that means the crowd may be discounting the difference between city forecasts and the airport’s official daily maximum, or pricing in a lower temperature band that would settle the market elsewhere.
Regulatory and access framing matters here: a German-facing user base may see GlüStV constraints apply if the activity is treated as gambling or betting under local law, while US persons face the broader risk that CFTC jurisdiction can reach event-based derivatives-like contracts depending on structure and venue. “No-KYC up to $1,500” means a small user may be able to join and trade without identity verification until cumulative activity hits that threshold, which can improve accessibility for this market but does not change the underlying legal status or settlement dependence on the Wunderground airport record.
Methodology
This overview of Highest temperature in Chengdu 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
- 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 Legal 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 Legal 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 Legal UK exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- 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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