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 |
|---|---|
| 35°C | 100% |
| 31°C or below | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 36°C | 0% |
| 37°C | 0% |
| 38°C | 0% |
| 39°C | 0% |
| 40°C | 0% |
| 41°C or higher | 0% |
Market context
On 11 August 2026, the highest temperature recorded at Chongqing Jiangbei International Airport Station will determine this market's outcome. The resolution will draw from Weather Underground's Daily Observations table rather than summary figures, a distinction that matters when intraday peaks diverge from headline highs. Chongqing's August climate typically peaks between 35–39 °C, though extremes have occasionally exceeded 40 °C during heat waves. The current 0% crowd probability suggests traders are either absent or expect the market to resolve outside all listed ranges, an unusual positioning for a straightforward meteorological event in a region with consistent summer heat.
Historical August temperatures at Chongqing Jiangbei show a median daily high near 36 °C, with roughly one in four years recording 38 °C or higher. The 2013 heat wave pushed readings to 40.3 °C; more recently, August 2022 saw sustained highs above 37 °C across multiple days. These precedents establish that mid-to-high 30s are the baseline expectation, whilst 40+ °C outcomes, though rare, occur roughly once per decade. The zero probability reading may reflect thin liquidity rather than genuine forecaster confidence in cooler conditions.
Traders should monitor China Meteorological Administration forecasts released in late July and early August 2026, as Chongqing's summer temperatures correlate with broader East Asian pressure systems and Tibetan plateau heating patterns. El Niño or La Niña conditions in 2025–2026 will influence seasonal anomalies. From a regulatory standpoint, this market falls within German GlüStV oversight if accessed from Germany, whilst US CFTC jurisdiction applies to US persons; the no-KYC threshold of $1,500 USD per transaction applies to individual trades, not cumulative exposure, affecting position-building strategy for larger traders.
Methodology
This overview of Highest temperature in Chongqing on August 11? 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
- 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.
- 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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