2026 Seoul Mayoral Election: Margin of Victory

Platform comparison

Active sub-markets

Market context

Seoul will hold its mayoral election on 3 June 2026, selecting the city's chief executive for a four-year term. The race will determine control of South Korea's largest metropolitan government, overseeing a budget exceeding 30 trillion won and policy levers across transport, housing, and urban development. Current crowd pricing reflects extreme uncertainty: the 0% YES probability indicates traders are pricing in either a consensus victory by one candidate or insufficient liquidity to establish a reliable margin forecast at this early stage.

Historical Seoul mayoral contests show margins varying significantly by political cycle. The 2018 election saw the Democratic Party's Park Won-soon win by approximately 5 percentage points; the 2014 contest produced a narrower 2-point margin. These precedents suggest outcomes ranging from single-digit to double-digit spreads depending on turnout, candidate appeal, and the broader political environment. South Korea's electoral volatility—driven by generational divides and regional allegiances—means early probability estimates often shift sharply once candidates formally declare and campaign messaging crystallises.

Key catalysts will include official candidate registration (typically 60 days before polling), party primary results if contested, and major policy announcements on Seoul's housing crisis and public transport. Traders should monitor approval ratings for incumbent President Yoon Suk Yeol, whose party's standing directly influences Seoul mayoral prospects. Funding flows into this market will likely accelerate once candidates emerge and polling data becomes available. Deposit methods including SEPA transfers, Klarna, and USDC settlement will determine liquidity depth as the election approaches, particularly among European traders seeking exposure to South Korean political outcomes.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Deposit UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on Polymarket Deposit UK?

Zero. Polymarket Deposit UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Deposit UK triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.