Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Review UK) Pick polygram.ink (preferred broker) |
95% | 5% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
95% | 5% | 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 | 95% |
| 36°C | 5% |
| 27°C or below | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 37°C or higher | 0% |
Market context
Incheon International Airport’s hottest reading on 6 August will be set by a short-lived afternoon peak, not the day’s average weather, so the key variable is whether the airport station briefly touches the upper end of the forecast range before sea-breeze moderation or showers kick in. Seoul-area forecasters are calling for exceptional heat on 6 August, with Seoul around 39°C and Incheon around 38°C, while current hourly guidance shows cloudy, humid conditions with intermittent rain and temperatures in the high 20s to low 30s Celsius through the day.[2][3][14][15]
For a market priced at 0% YES, the historical frame matters: August is normally hot in Seoul, but average highs are much lower than the present heatwave setup, and early-August extremes can still hinge on whether the local station records a single reading above the market’s target band. WeatherSpark puts Seoul’s highest average daily high in early August at about 85°F, while recent reporting notes Seoul has exceeded 39°C only once in the modern record, on 1 August 2018, which shows how far into the tail this kind of outcome sits.[13][11] Programmatically, a trader would treat this as a range-lookup problem against the Wunderground daily maximum for RKSI, polling the daily history page after the settlement window and mapping the reported high into the market’s bands.[1]
The practical catalysts are the Korea Meteorological Administration’s short-range updates, any changes to the heatwave warning, and the timing of showers or thunder that could cap the airport’s maximum before the daily peak. SBS and Asiae both reported a continuing heatwave emergency warning for the Seoul metropolitan area on 6 August, with very high perceived temperatures and daytime highs near 38–39°C, but also enough humidity and intermittent rainfall to create local volatility in the actual station reading.[2][3][11]
Methodology
This page reviews Highest temperature in Seoul (Incheon) on August 6? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Review UK, which mirrors the Polymarket order book at 0% fees.
Resolution & payout
Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.
Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.
UK Frequently Asked Questions
- Where can I trade this market with the lowest fees?
- Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- What's the difference between YES and NO shares?
- A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
Trade Highest temperature in Seoul (Incheon) on August 6? on Polymarket Review UK
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