Highest temperature in Beijing on July 4?

Platform comparison

Market context

On 4 July 2026, the Beijing Capital International Airport Station will record its peak temperature for the day, a single real-world metric that determines the outcome of this prediction market. The current crowd-implied probability of 0% for a “YES” outcome suggests traders believe the temperature will not exceed the defined threshold, likely 35°C, despite July being Beijing’s hottest month. Historical data shows July highs typically average around 31°C (88°F), rarely dipping below 26°C or exceeding 36°C, with the city’s all-time record hitting 42.1°C on 5 July 2010[2][8]. Even in 2023, temperatures reached 40°C during the month, confirming that extreme heat is not uncommon in early July[3].

Traders should monitor upcoming weather forecasts from the China Meteorological Administration and real-time data from Wunderground, the official resolution source, as heatwave patterns can shift rapidly due to monsoon activity or urban warming effects[1]. Recent reports indicate China’s national average temperature hit a record 23.2°C last month, driven by persistent heatwaves across northern regions[6]. Platform comparisons reveal key divergences: Polymarket uses decimal odds and lower fees with minimal KYC, while Kalshi requires full identity verification and offers implied probabilities with higher regulatory oversight; Betfair and Smarkets charge commission-based fees and display decimal odds, differing from Polymarket’s fee-free model[4]. These structural differences influence liquidity and pricing efficiency on this specific market.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Beijing on July 4? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.

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.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.