Highest temperature in Seoul on July 24?

Platform comparison

Market context

Seoul’s hottest reading for the day is usually shaped by a muggy summer airmass, with July averages clustering around the high 20s Celsius and brief, heavy rain interrupting the heat rather than removing it entirely. Long-run guides put typical July highs near 27–30°C, which makes a **YES** outcome above the lower temperature bands more plausible than an extreme-heat outlier, especially for a settlement source tied to Incheon Intl Airport rather than a city-centre station.[1][2][4]

That leaves the current **0% YES** crowd view looking like a very low bar for the market’s actual framing, because the contract resolves on the **highest temperature recorded on 24 July** at a specific airport station, not on a Seoul city average or a forecast headline. On Polymarket, traders see that as an implied probability; on Kalshi, the same view would be expressed in price terms, while Betfair and Smarkets typically present decimal odds and deduct exchange commission, so the same weather view can look meaningfully different after fees and format conversion. KYC and access also vary: Kalshi is US-focused, while Betfair and Smarkets generally operate under broader exchange-style account verification regimes, which can affect who can trade this contract and at what size.

For traders, the key catalysts are the day-of forecast revisions, any change in the strength of the summer monsoon, and whether morning cloud and rainfall suppress the station’s afternoon peak. July in Korea is still within the wet-season window in many descriptions of the peninsula’s weather, with Jangma sometimes extending into late July, so short-notice rain bands can matter more than long-range averages for a single-day temperature high.[3][4]

Sources: 1 · 2 · 3 · 4

Methodology

We read Highest temperature in Seoul on July 24? 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

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

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.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

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

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets 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.