Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
56% | 44% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
56% | 44% | 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 |
|---|---|
| 32°C | 56% |
| 33°C | 37% |
| 34°C | 4% |
| 35°C | 1% |
| 26°C or below | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 36°C or higher | 0% |
Market context
At Incheon International Airport, the key question is whether the day’s **highest temperature** lands in a low, mid, or upper-30s band, with this market settling on the Wunderground reading for the station rather than a citywide Seoul figure. Forecasts for 3 August point to a hot but not extreme afternoon on the west coast: Korean reporting has Incheon near **34°C**, while Seoul is expected around **37°C** under a heatwave warning, and official coverage says the capital area is already under elevated heat stress as easterly winds shift and clear skies persist.[1][3][5]
For reading the current **0% YES** price, the useful comparison is with August norms and recent Korean summer patterns. Seoul’s August average high is around the mid-20s Celsius in general climate datasets, while recent local forecasts and heatwave coverage place daily highs far above that seasonal baseline, but still usually below the rare upper-30s spikes that drive the highest bands.[2][14][15] The market therefore looks more like a bet on whether the airport observation can exceed the mid-30s threshold than on whether the broader region is hot at all; comparable forecasts in the same reporting range from Incheon at 33–34°C to Seoul at 35–37°C, which supports a distribution clustered below the most extreme band.[3][8][12]
The main catalysts are the Korea Meteorological Administration’s short-range updates, which can tighten or soften the expected peak as cloud cover, sea-breeze effects, or afternoon rain shift the realised maximum. Several Korean outlets reported that the North Pacific high should dominate from 3–9 August, keeping much of the country clear and hot, but with showers and rainfall potential in parts of the west and south that could trim daytime highs.[8][9][12] On accessibility, German GlüStV rules can make participation materially harder for users who are treated as being in Germany because licensed offerings face strict product and onboarding rules, while US CFTC reach means some event-contract activity may be unavailable to US persons depending on venue structure and enforcement posture; “no-KYC up to $1,500” generally means limited registration and withdrawals are possible below that threshold, but it does not eliminate geo-blocking, regulatory checks, or source verification for this market.
Methodology
This overview of Highest temperature in Seoul (Incheon) on August 3? 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.
- Do I need to KYC for Is Kalshi Legal in California?
- 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.
- What happens during a tax audit?
- You're responsible for documenting your trades. Is Kalshi Legal in California 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 Legal in California would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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