Highest temperature in Seoul on July 28?

Platform comparison

Market context

On 28 July 2026, the highest temperature recorded at Incheon International Airport Station will determine which range bracket resolves YES. Seoul's summer climate typically peaks in late July, with historical highs around 33–35°C during this period, though extreme heat events have occasionally pushed readings above 37°C. The settlement mechanism relies on Wunderground's historical weather database for the specific station, making data accessibility a key factor for traders verifying outcomes post-event.

The 0% crowd probability reflects either minimal trading activity on this particular market or strong consensus that the question's framing creates ambiguity around which temperature bracket is being offered. Comparable weather markets on Polymarket and Kalshi show divergent liquidity patterns: Kalshi's regulated US-weather contracts typically attract tighter spreads and higher participation, whilst Polymarket's international weather markets often trade with wider bid-ask gaps and lower volume. The decimal odds format on Betfair and Smarkets can obscure implied probabilities for casual traders unfamiliar with converting 1.01 odds into percentage terms, potentially explaining why some platforms show more active price discovery than others on identical underlying events.

Traders should monitor the Korea Meteorological Administration's seasonal forecasts and any heat-wave warnings issued in early July 2026, as these typically precede significant temperature swings. The settlement window closes at 12:00 UTC on the event date, which may create timing mismatches for traders in Asian time zones attempting last-minute position adjustments. Fee structures across platforms—Polymarket's 2% maker fee versus Kalshi's tiered approach—will affect breakeven thresholds on marginal probability assessments.

Methodology

This page compares Highest temperature in Seoul on July 28? 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

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

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. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.