Highest temperature in Tokyo on July 27?

Platform comparison

Market context

Tokyo’s late-July heat is typically driven by a humid, summer pattern rather than sharp day-to-day swings. In major Japanese cities, July averages are often quoted in the \(25\text{°C}\) to \(33\text{°C}\) range, with high humidity; for Tokyo specifically, average July wind speeds are described as essentially steady, which matters because light, persistent airflow does little to cap afternoon heating.[2][1] For this contract, the key point is not the monthly mean but the *daily maximum* logged at Haneda, where a few degrees either side of the seasonal norm can shift the winning temperature band.

The 0% crowd-implied YES price suggests the market is treating this as a highly specific and time-bounded weather print rather than a directional macro bet. In comparable Tokyo July conditions, the highest temperature often lands in the upper 20s to low 30s Celsius, so the outcome depends less on broad climate averages than on whether a clear, dry spell develops over the airport site during local afternoon hours.[2] For a USDC-settled market, the main trading relevance is the precision of the observation source: the Wunderground Haneda history page will decide settlement, so small differences in temperature bands can matter more than the broader city forecast.

Traders should watch the Tokyo forecast for cloud cover, humidity, and any rain-bearing systems that could suppress the day’s peak, along with the timing of the settlement cut-off at 12:00 UTC, which falls mid-evening in Tokyo. If bitcoin and ether are trading on risk-off headlines, that can influence prediction market liquidity and hedging behaviour, but the contract itself still resolves only to the Haneda reading rather than any exchange or chain variable.

Sources: 1 · 2

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.

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.

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.

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.