Highest temperature in Seoul on July 13?

Platform comparison

Market context

Seoul faces a critical heat threshold on 13 July 2026, with the Incheon International Airport station serving as the definitive resolution point for the highest daily temperature in degrees Celsius. The market currently implies a 0% probability of a specific outcome, suggesting traders view the event as highly unlikely or the conditions as misaligned with historical precedents. This zero probability often reflects a lack of immediate catalysts or a consensus that the temperature will fall outside the defined range, despite recent regional heat trends.

Historical data frames this probability sharply: Seoul reached 37.8°C in early July, marking the hottest start to the month in 117 years of records, while the nation’s all-time peak hit 41.0°C in Hongcheon [1][4]. July 2025 was South Korea’s second-hottest since 1973, with averages of 27.1°C and tropical nights exceeding 25°C for 22 consecutive days [3][7]. Typical July highs in Seoul rarely exceed 91°F (32.8°C), yet recent anomalies suggest volatility that could challenge the 0% crowd-implied stance if extreme heat persists [5].

Traders should monitor real-time Wunderground updates for the Incheon station and watch for Korean Meteorological Administration announcements on heatwaves or tropical night streaks, which have driven record-breaking temperatures recently [2]. The settlement window closes at 12:00 UTC on 13 July 2026, with USDC settlement tied to on-chain mechanics on btc-prediction.bet. While crypto macro factors like BTC/ETH funding rates or whale flows may influence liquidity, the primary catalyst remains the weather data itself, as no crypto-specific announcements directly alter the temperature outcome [6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

Are crypto prediction markets taxable in the US?

In the US, prediction market gains are typically treated as ordinary income or short-term capital gains depending on holding period. Consult a tax professional for your specific situation — we cannot provide tax advice.