Highest temperature in Seoul (Incheon) on August 3?

Platform comparison

Market context

The real-world driver here is the afternoon peak at Incheon International Airport Station, where the market settles on the highest recorded temperature on 3 August 2026. KMA-linked reporting points to a strong heatwave across the capital area, with Seoul forecast around 37°C and Incheon around 34°C, while clear skies and a North Pacific high are expected to keep the heat in place through the day.[1][3][6][8]

The current 0% implied probability is hard to reconcile with the forecast setup, because comparable August cases in Seoul and the west coast usually resolve close to the published daily high rather than to anything unusual on the low side. Seasonal context also matters: August is typically Seoul’s hottest month, with average highs around 30°C and frequent humidity, so even a moderate forecast is already above normal.[2][15][17] For a station-based Wunderground settlement, the relevant question is whether Incheon reaches the mid-30s or stays a few degrees cooler than Seoul; the latest local forecasts cluster around 33–34°C for Incheon and 35–37°C for Seoul, which leaves the outcome concentrated in the upper 20s to mid-30s Celsius buckets.[3][6][12]

Traders should watch the KMA’s short-range updates, because late-morning adjustments to cloud cover, sea breeze, or shower timing can shift the airport reading by a couple of degrees, especially near the Yellow Sea coast.[4][6][12] The on-chain angle is straightforward: the contract settles in USDC, so pricing usually tracks broader risk sentiment only indirectly, but a sharp BTC or ETH move can still affect liquidity and willingness to take directional weather risk. Spot flows and funding rates are more relevant for market depth than for the weather itself, yet they can matter if crypto volatility rises into the settlement window.

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.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

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.

How volatile are crypto prediction markets?

Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.

Which crypto markets exist on Polymarket?

Currently active markets include BTC/ETH/SOL price targets, halving dates, ETF approvals, hard-fork outcomes and Layer-2 TVL thresholds. The list updates weekly; biggest volume sits on BTC and ETH price forecasts.