Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Go to the live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Go to the live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Go to the live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Go to the live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 31°C | 100% |
| 22°C or below | 0% |
| 23°C | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 32°C or higher | 0% |
Market context
Seoul will experience its peak summer heat on 17 July 2026, with the Incheon International Airport station recording the day’s highest temperature in degrees Celsius. Historical July data shows Seoul routinely hits highs around 30°C, often dipping into the mid-30s during humid spells, while average daily temperatures range from 25°C to 29°C[1][2]. The current 0% crowd-implied probability for a “YES” outcome likely reflects a specific, narrow temperature range being queried that falls outside typical July extremes, rather than a belief that no high temperature will occur. Comparable cases from recent summers confirm that days exceeding 32°C are common in Seoul during July, with humidity pushing the “real feel” toward 35°C[2].
Traders should monitor the Korean Meteorological Administration’s daily forecast releases and Wunderground’s real-time station updates for Incheon, as sudden rain bursts or cloud cover can suppress peak temperatures[3]. A key catalyst is the onset of the monsoon season, which typically brings nearly 400mm of precipitation by month-end and can lower daytime highs significantly[2]. Recent weather guides note that while average highs sit in the high 20s°C, multiple days in July regularly reach the low 30s°C or higher, making extreme outliers plausible but dependent on short-term atmospheric shifts[2].
From a regulatory standpoint, German GlüStV implications and US CFTC reach shape accessibility for this weather market, particularly regarding KYC thresholds. The “no-KYC up to $1,500” provision allows traders to access this market without identity verification below that limit, enhancing accessibility while remaining within current compliance frameworks. This structure aligns with emerging global standards for prediction markets, balancing user privacy with regulatory oversight.
Methodology
This overview of Highest temperature in Seoul on July 17? 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 Legal in California 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.
- Can I trade anonymously?
- Pseudonymously, yes — up to the KYC threshold. Is Kalshi Legal in California 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.
- 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 Legal in California would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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