Highest temperature in Singapore on July 8?

Platform comparison

Market context

The underlying event is the highest temperature recorded at Singapore Changi Airport on 8 July 2026, measured in degrees Celsius and resolved via Wunderground data. Current crowd-implied probability sits at 0% for the 31°C range, suggesting traders expect the peak to fall below that threshold despite typical July highs.

Historical patterns at Changi show July temperatures usually range between 29°C and 32°C, with 31°C being the most frequent single outcome in recent years [5][7]. However, thundery showers forecast for today may suppress the peak, as seen in similar wet July days where highs dipped to 29–30°C [2][6]. This weather volatility frames the current 0% probability as a reaction to immediate cloud cover rather than a long-term trend.

Traders should monitor real-time updates from Wunderground and AccuWeather for shifts in shower intensity, as even brief rain can cap the day’s maximum [2][6]. Any sudden clearing could push temperatures toward 31°C, especially if southerly winds intensify and humidity drops. Watch for whale flows on crypto prediction platforms like btc-prediction.bet, where large USDC bets may signal insider confidence in a temperature breakout [4].

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.

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.

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.