Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Tax UK) Pick polygram.ink (preferred broker) |
94% | 6% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
94% | 6% | 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 | 94% |
| 30°C | 3% |
| 31°C | 1% |
| 25°C or below | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C or higher | 0% |
Market context
The event is the highest temperature recorded at Chengdu Shuangliu International Airport on 6 August 2026, with settlement tied to the day’s maximum reading in Celsius from the specified Wunderground station page. Current market pricing at 0% YES implies traders are treating the targeted temperature band as effectively outside the likely outcome set, even though late-summer Chengdu is normally warm and humid, with August daytime highs commonly around 30°C and some forecasts for 6 August in the low-to-mid 30s Celsius. [2][6][12]
For context, Chengdu’s August climatology usually supports heat but not extreme dry-heat spikes: long-run guides place typical highs near 30°C, while broader August ranges often sit roughly in the mid-20s to low-30s Celsius. That matters because prediction-market probabilities on weather ranges tend to track whether the expected maximum lands near the centre of the distribution or near its upper tail; a 0% print can therefore reflect either a genuinely remote band or a market that has not yet repriced for the latest local forecast. [2][7][10][18]
Traders should watch the final airport-hour observations, any updated city forecast from official or mainstream weather services, and rainfall timing, because cloud cover and showers can cap the daily maximum even when the broader forecast remains hot. Hong Kong’s government weather bulletin for Chinese cities listed Chengdu at 21–35°C with rain on 5 August, which is consistent with a warm but weather-sensitive setup, and the practical accessibility angle is regulatory rather than meteorological: German GlüStV can affect whether a user-facing betting-style platform is treated as restricted gambling exposure, the US CFTC may assert reach where a contract is viewed as a commodity derivative, and “no-KYC up to $1,500” usually means a capped entry threshold before identity checks, not full anonymous access, for this specific market’s participation. [12][1][15]
Methodology
This overview of Highest temperature in Chengdu on August 6? 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.
UK Frequently Asked Questions
- 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.
- Is Polymarket regulated by the UKGC?
- No. Polymarket is not licensed by the UK Gambling Commission (UKGC). It is a decentralised prediction market operated under US regulation. UK traders can use it but do not benefit from UKGC dispute resolution or player protection requirements.
- What are the HMRC tax rules on Polymarket profits for UK traders?
- Polymarket profits are treated as cryptocurrency disposal events by HMRC. Each USDC settlement is a taxable event subject to Capital Gains Tax (CGT). For 2026/27, the CGT rate is 18% (basic rate) or 24% (higher rate). The annual CGT exemption is £3,000. Report via HMRC Self Assessment if your total crypto gains exceed £3,000 or proceeds exceed £50,000.
- Does Polymarket KYC apply to UK users?
- Yes. Polymarket requires KYC (Know Your Customer) verification for all users, including UK residents. You must provide a government-issued photo ID and a selfie. The process typically takes 5–10 minutes via their ID verification provider.
- What is the legal difference between Polymarket and Betfair Exchange for UK traders?
- Betfair Exchange is UKGC-licensed, meaning UK consumer protections apply and winnings are typically tax-free. Polymarket is not UKGC-licensed — it operates under decentralised blockchain rules. Profits from Polymarket are subject to HMRC CGT as crypto disposals. Choose based on your regulatory preference and tax situation.
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