Highest temperature in Tokyo on July 17?

Platform comparison

Market context

Tokyo’s highest temperature on 17 July 2026 will be recorded at the Tokyo Haneda Airport Station and resolved via Wunderground’s daily history in degrees Celsius. The market settles in USDC on-chain, with the current crowd-implied probability of any outcome above the lowest range sitting at 0% YES, suggesting traders expect a cool start to the day.

Historical July highs in Tokyo typically exceed 30°C, with Haneda Airport often recording 33–35°C during mid-month heatwaves. For instance, July 2023 saw Tokyo reach 36.2°C, while July 2022 peaked at 35.1°C at Haneda [1]. The 0% probability assigned to higher ranges contradicts this pattern, implying either a mispriced market or an expectation of unusual cloud cover or rain ahead of settlement.

Traders should monitor the Japan Meteorological Agency’s 72-hour forecast for Tokyo, particularly any announcements of typhoon activity or heavy rain bands that could suppress temperatures. Funding rates on BTC and ETH perps remain elevated, and whale flows into short-dated weather derivatives on crypto prediction platforms may signal a shift if macro volatility spills into non-financial contracts. A sudden drop in spot BTC below $60,000 could trigger risk-off flows that reprice low-probability weather outcomes, especially if settlement hinges on a narrow temperature window.

Sources: 1

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

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.

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.

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.