Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Legal UK) Pick polygram.ink (preferred broker) |
55% | 45% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
55% | 45% | 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 |
|---|---|
| 33°C | 55% |
| 32°C | 41% |
| 34°C | 6% |
| 31°C | 1% |
| 35°C | 1% |
| 29°C or below | 0% |
| 30°C | 0% |
| 36°C | 0% |
| 37°C | 0% |
| 38°C | 0% |
| 39°C or higher | 0% |
Market context
The relevant event is the highest temperature recorded at Incheon International Airport for 9 August, measured from Weather Underground’s Daily Observations table rather than any headline day-high summary. Forecasts around Seoul and the wider capital area have pointed to a hot, humid day, with highs in the low-to-mid 30s Celsius and only scattered showers, which makes a modestly warm outcome materially more likely than an unusually cool one.[2][5][7][10][15]
The current **0% YES** crowd price is best read as a liquidity or timing signal, not a meteorological one, because comparable Seoul summer days often land near forecast highs rather than extreme tail outcomes. August is climatologically one of the hottest months in Seoul, with typical daytime highs around the high-20s Celsius and historical August records well above current forecasts, so a range tied to ordinary late-summer heat is more consistent with precedent than a very low or very high outlier.[16][17][18] For accessibility, a **no-KYC up to $1,500** structure generally means smaller positions can be placed without full identity verification, but that does not remove any legal or platform limits that may still apply.
Traders should watch the short-range guidance from the Korea Meteorological Administration and any airport-station updates that can shift the final Daily Observations reading before the settlement window closes. In practice, the key catalysts are morning cloud cover, sea-breeze effects around Incheon, and whether passing showers hold the station below the forecast high; those are the factors most likely to move the final temperature band. For regulatory framing, German **GlüStV** rules matter to access from Germany because they can restrict or condition participation in gambling-like products, while the US **CFTC** reach is relevant where a market is treated as a derivatives instrument and may be subject to US jurisdictional scrutiny.
Methodology
This overview of Highest temperature in Seoul (Incheon) on August 9? 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
- 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.
- 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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