Highest temperature in Chengdu on July 11?

Platform comparison

Market context

Chengdu Shuangliu International Airport is set to record its peak daily temperature for 11 July 2026, with the market resolving to the specific Celsius range containing that high. The current crowd-implied probability of 0% for a YES outcome suggests traders believe the temperature will fall outside the specific range being bet on, despite July being the city’s hottest month, where highs routinely reach 30–35°C and occasionally hit 38°C [3][5]. Historical data confirms extreme heat is plausible, with the city’s hottest recorded day hitting 38.6°C in August 2022, and July averages peaking around 31°C [7][10].

Traders should monitor real-time Wunderground updates for the Shuangliu station, as the market resolves strictly on this source’s daily high [8]. Unlike Kalshi’s decimal odds or Betfair’s spread betting, Polymarket uses implied probability percentages, which can obscure fee structures; Kalshi charges no fees on wins but requires KYC, whereas Polymarket’s fee model varies by liquidity and often lacks the same regulatory reach [9]. The key catalyst is the absence of significant cooling rain systems, as July typically sees 20 rainy days with evening thunderstorms that could suppress peak heat [3].

Divergence between platforms is stark here: Smarkets and Betfair offer decimal odds that allow precise hedging across bins, while Polymarket’s binary or range-based implied probabilities may limit granularity for thin-volume markets like this specific date [9]. With settlement ending 12:00 UTC on 11 July 2026, the 0% probability implies the market expects a temperature below the threshold, yet the basin geography and historical peaks suggest a non-zero risk of 38°C+ events [3][9].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Chengdu on July 11? 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

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

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

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.

Which platform is accessible globally?

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