Highest temperature in Busan on July 28?

Platform comparison

Market context

On 28 July 2026, the highest temperature recorded at Gimhae International Airport Station in Busan will determine which range this market resolves to. The settlement hinges on a single daily maximum reading from South Korea's largest port city, with resolution sourced directly from Weather Underground's historical data for that specific station and date.

Busan's July climate sits within a predictable band. Historical records show daily maxima in late July typically range between 28–32°C, with occasional spikes to 33–34°C during heat waves. The 0% crowd probability on this market suggests either extreme confidence in a specific temperature bracket or sparse liquidity—a pattern worth cross-referencing across platforms. Kalshi's binary structure and Polymarket's decimal odds framework handle weather ranges differently; Kalshi's yes/no format forces clearer threshold definition, whilst Polymarket's fractional odds can obscure the granularity of temperature bands. Betfair and Smarkets, with their commission-based fee models, typically attract tighter spreads on established weather markets, whereas newer platforms may show wider gaps between bid and ask on niche regional forecasts.

The Korean Meteorological Administration publishes seasonal outlooks and heat-wave alerts; traders should monitor their July 2026 forecasts and any issued warnings in the weeks prior. El Niño or La Niña conditions in the Pacific, if established by mid-2026, would shift baseline expectations upward or downward. Gimhae Airport's location near Busan's coast provides maritime moderation compared to inland Korean cities, a factor that historical volatility patterns confirm. Settlement timing at 12:00 UTC on 28 July means the full day's maximum will be known before market closure, eliminating intraday uncertainty.

Methodology

We read Highest temperature in Busan on July 28? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.