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% |
| 25°C or below | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C or higher | 0% |
Market context
On 15 August 2026, the highest temperature recorded at Gimhae International Airport Station in Busan will be measured and compared against predefined Celsius ranges. The resolution will draw from Weather Underground's Daily Observations table rather than summary figures, establishing a precise, auditable baseline for settlement. Busan's August climate typically peaks between 28–32°C, though extreme heat events have occasionally pushed readings above 33°C in recent years.
The 0% crowd probability reflects either extreme confidence in a specific temperature band or sparse trading activity in this niche weather market. Historical August data from Gimhae shows considerable year-to-year variation; the 2018 heat wave drove readings to 34.1°C, whilst cooler years have settled around 27–29°C. Seasonal patterns—monsoon influence, urban heat island effects, and tropical cyclone proximity—create material uncertainty. Traders should examine long-term station records and comparable August forecasts from the Korea Meteorological Administration to calibrate expectations against the current implied distribution.
From a regulatory standpoint, this market operates under distinct jurisdictional frameworks depending on trader location. The German GlüStV (Glücksspielstaatsvertrag) treats prediction markets as gaming contracts, subjecting them to licensing requirements; EU-based participants should verify their platform's compliance status. US CFTC oversight applies to certain derivatives, though binary weather contracts often fall into grey zones pending clarification. Many platforms offer no-KYC access up to $1,500 in cumulative exposure, allowing retail participation without identity verification below that threshold—a material accessibility feature for low-stake weather speculation. Traders should confirm their jurisdiction's stance before committing capital.
Methodology
This overview of Highest temperature in Busan on August 15? 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
- 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.
- 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.
- 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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