Highest temperature in Seoul (Incheon) on August 5?

Platform comparison

Market context

The event is whether the **highest temperature at Incheon International Airport on 5 August** lands in a band that resolves the market, and the crowd’s 0% YES implies the contract is still being priced as effectively out-of-the-money. With settlement tied to the Wunderground daily history page for Incheon Intl Airport Station, the relevant print is the day’s maximum in Celsius, not a Seoul city centre reading, so traders need to track the airport station specifically rather than broader metro forecasts.

The current setup is consistent with a hot but not unprecedented Korean summer pattern. Forecasts for Seoul have been unusually aggressive, with local reporting citing a **38°C** daytime high and severe heat warnings across the capital region, while other forecast services point to highs in the low 30s °C for nearby parts of the city and surrounding districts.[1][2][6][7] That spread matters because Incheon’s coastal position can cap extremes versus inland Seoul, making the exact airport high the key variable; in past August conditions for Seoul, daily highs commonly cluster around the low-to-mid 30s °C, with occasional spikes into the upper 30s during heatwaves.[2][16][17]

For traders, the main catalysts are the morning update cycle, any adjustment to the Korean Meteorological Administration short-range forecast, and whether showers or cloud cover blunt the afternoon peak.[1][9] Because the market settles in USDC on-chain, the practical edge comes from knowing whether the final Wunderground observation is likely to print above or below the strike band, while broader crypto beta can still affect liquidity and positioning if BTC or ETH volatility leaks into risk appetite. If spot moves and funding remain calm, this market will usually trade more on the weather print itself than on wider digital-asset flows.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Seoul (Incheon) on August 5? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

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.

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.

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.