Highest temperature in Beijing on July 10?

Platform comparison

Market context

The real-world event hinges on whether Beijing’s Capital International Airport records a peak temperature above 29°C on 10 July 2026, with the crowd currently assigning a 79% probability to the “YES” outcome. This market resolves at noon UTC via Wunderground data, capturing the highest temperature recorded at any time on that day.

Historically, July is Beijing’s hottest month, with daily highs averaging around 31°C (88°F) and rarely dipping below 26°C (78°F) [4]. In 2023, the city hit 40°C, and its all-time record stands at 41.9°C from 1999 [1][3]. Recent years show intensifying heatwaves, with 2024 marking China’s hottest month in recent history [10]. These patterns support the high implied probability, though thin trading volume on similar markets suggests caution [9].

Traders should monitor China’s National Meteorological Centre forecasts and local heatwave advisories, as authorities have recently urged outdoor limits during extreme heat [3]. A key dependency is the timing of the day’s peak temperature, which typically occurs between 14:00–16:00 local time. Platform differences matter here: Polymarket uses decimal odds and lower fees but requires KYC, while Kalshi offers implied probabilities with stricter US access rules [2]. Smarkets and Betfair diverge further in fee structures and liquidity depth, affecting price efficiency on thin markets like this one.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Beijing on July 10? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.