Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legit) Pick polygram.ink (preferred broker) |
79% | 21% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | See live odds → |
Polymarket (direct) polymarket.com |
79% | 21% | 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 |
|---|---|
| 28°C | 79% |
| 29°C | 20% |
| 30°C | 2% |
| 21°C or below | 0% |
| 22°C | 0% |
| 23°C | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 31°C or higher | 0% |
Market context
The real-world event driving this market is the highest temperature recorded at Incheon International Airport on 10 July 2026, a date falling within South Korea’s monsoon season when heatwaves and sudden rain showers frequently collide. Historical data shows early July in Seoul typically averages 25–30°C, with recent extremes reaching 37.8°C on 8 July 2026, marking the hottest early-July day in over a century[3][8]. Despite these spikes, the current crowd-implied probability of 0% for a specific temperature range suggests traders view the monsoon’s cooling effect as dominant, though comparable heatwave years indicate volatility remains high if cloud cover breaks unexpectedly.
Traders should monitor daily short-range forecasts from the Korea Meteorological Administration, particularly any announcements of sustained high-pressure systems or delays in the monsoon’s retreat, which could trigger rapid temperature surges[9]. Recent coverage by Anadolu Ajansı highlights that Seoul’s record-breaking 37.7°C in early July 2026 underscores the region’s susceptibility to extreme heat, even during rainy periods[8]. Regulatory accessibility also shapes participation: under Germany’s GlüStV, prediction markets face strict licensing, while the US CFTC permits limited unregistered activity for non-KYC platforms up to $1,500, allowing traders to access this market without identity verification if they stay within that threshold. This “no-KYC” status enhances liquidity but introduces compliance risks for operators navigating cross-border tax obligations.
Methodology
This overview of Highest temperature in Seoul on July 10? 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.
- Is there a withdrawal cap?
- No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).
- 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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