Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legit) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | See live odds → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | See live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | See live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | See live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | See live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 30°C | 100% |
| 23°C or below | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C or higher | 0% |
Market context
The real-world event in question is the highest temperature recorded at Incheon International Airport on 1 July 2026, a date that falls squarely within South Korea’s hot, humid monsoon season where daily highs often approach 30°C and humidity levels exceed 80%[3]. Current crowd-implied probability of 0% for the “YES” outcome suggests the market expects the temperature to fall outside the specific range being traded, likely because models cluster highs near 29–30°C, making extreme deviations unlikely[1].
Historically, comparable cases from recent July days in Incheon show consistent thermal patterns: on 2 July 2026, the frontrunner was 28°C at 37%, indicating a stable but slightly cooler trend than 1 July, while early June already saw temperatures hit 32°C, a heat level typically associated with July[2][7]. These precedents frame the current 0% probability as a rational assessment rather than an outlier, given that extreme highs are statistically rare in this monsoon window.
Traders should monitor the Korea Meteorological Administration’s short-range forecasts for heatwave alerts and precipitation probability, as sudden shifts in the Jangma rainy season could suppress temperatures[5][10]. Recent reports confirm that July is South Korea’s wettest month, with short but heavy rainfalls concentrated in this period, making weather volatility a key dependency[3]. Additionally, regulatory frameworks such as Germany’s GlüStV and the US CFTC’s reach over prediction markets mean that accessibility hinges on KYC thresholds; the “no-KYC up to $1,500” rule allows retail participants to engage without identity verification, enhancing market liquidity for this specific temperature event.
Methodology
This overview of Highest temperature in Seoul on July 1? 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. Is Kalshi Legit has a different geo footprint.
- 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.
- What happens during a tax audit?
- You're responsible for documenting your trades. Is Kalshi Legit exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- Are prediction markets gambling?
- Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.
- What if regulation changes?
- If regulation changes in your jurisdiction (e.g. prediction markets are banned), Is Kalshi Legit would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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