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 |
|---|---|
| 34°C | 100% |
| 27°C or below | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 35°C | 0% |
| 36°C | 0% |
| 37°C or higher | 0% |
Market context
The key real-world event is the **highest temperature recorded at Incheon International Airport on 5 August 2026**, as measured for settlement by the market’s specified Wunderground station. Seoul-facing forecasts for the day point to intense heat, with SBS reporting a Seoul metropolitan heatwave warning and a daytime high of **38°C** in Seoul, while other forecast services cluster August highs in the low-to-mid 30s Celsius rather than anything close to freezing or unusually cool conditions.[1][2][10][16]
That leaves the current **0% YES** probability looking more like a pricing outlier than a reflection of the weather setup. August is climatologically Seoul’s hottest period, with average highs around **28–31°C** and occasional extremes above **38°C**, so the market’s positive range would usually need an exceptionally cold reading to settle outside the expected summer bands.[12][16][18] For a comparable framing, traders often treat airport-station temperature markets as sensitive to the difference between city forecasts and the exact observing site: coastal or airport microclimates can run a little cooler or warmer than central Seoul, but not enough to justify a near-zero price absent a genuine data issue.
The main catalysts are the **morning and midday forecast updates**, any rain bands that could cap the daily maximum, and whether the Incheon station sees the same heat peak implied for the wider Seoul area.[1][4][9] Because settlement is tied to the station’s recorded maximum rather than a generic city forecast, traders should watch for changes in cloud cover, showers, or sea-breeze effects near the airport. On market access, **German GlüStV** treatment matters because prediction markets can be constrained by gambling rules, **US CFTC reach** matters because US-facing derivatives-style activity can attract regulatory scrutiny, and “**no-KYC up to $1,500**” means small balances may be accessible without full identity verification, but only within platform limits and applicable jurisdictional controls.
Methodology
This overview of Highest temperature in Seoul (Incheon) on August 5? 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 Tax UK has a different geo footprint.
- Do I need to KYC for Polymarket Tax UK?
- Not for lifetime trading volume under $1,500. Above that threshold, a quick KYC flow kicks in — ID, selfie, approximately 5-10 minutes. The threshold matches FATF travel standards for unregulated crypto platforms.
- 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.
- What happens during a tax audit?
- You're responsible for documenting your trades. Polymarket Tax UK exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- What if regulation changes?
- If regulation changes in your jurisdiction (e.g. prediction markets are banned), Polymarket Tax UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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