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 |
|---|---|
| 32°C | 100% |
| 24°C or below | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 33°C | 0% |
| 34°C or higher | 0% |
Market context
Busan’s highest temperature today will be set by conditions at Gimhae International Airport, the official station used for settlement, so the key question is whether the afternoon heat pushes the Daily Observations maximum into the 30°C-plus bands. Current forecasts cluster around the mid-to-high 20s to mid-30s Celsius in the city, with AccuWeather and Timeanddate both pointing to a warm, humid day and some thunderstorm risk early on[12][15].
The 0% implied probability is best read as a stale or non-functional market price rather than a meaningful forecast. August is Busan’s warmest month on climate averages, with typical highs around 84–87°F and daily maxima often near 30°C, while historical climate summaries note occasional hotter spikes into the mid-30s Celsius[10][11][19]. That means the distribution is naturally centred in the low-to-mid 30s Celsius, making any very low price hard to reconcile with the underlying weather regime.
For traders, the main catalysts are the morning forecast updates, thunderstorm timing, cloud cover, and whether sea-breeze effects limit inland warming before the settlement window closes at 12:00 UTC. Recent regional reporting shows South Korea is in an exceptional heat episode, with authorities warning of dangerous conditions as temperatures have climbed into the high 30s and above in parts of the south, which can support upside risk if the hot air mass reaches Busan[8]. On accessibility, German GlüStV can matter because it may restrict or require local compliance for gambling-like products, US CFTC reach can apply where a market is treated as a derivatives-style contract, and “no-KYC up to $1,500” generally means small-value access with lighter identity checks until cumulative activity crosses that threshold.
Methodology
This overview of Highest temperature in Busan on August 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 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.
- 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.
- 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).
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