St. Louis City SC vs. Sporting Kansas City - More Markets

Platform comparison

Market context

St. Louis City SC faces Sporting Kansas City in a Major League Soccer match scheduled for 16 July at 8:30 PM ET, with the settlement window closing shortly after the game concludes. In prediction markets, a YES share pays out if the specific outcome occurs, while a NO share pays out if it does not; here, the market currently implies a 0% chance for the selected outcome, suggesting the crowd views it as highly unlikely.

Historically, MLS matchups between these rivals often favour St. Louis at home, with bookmakers recently pricing them as strong favourites with a 71% win probability and odds of 1.03 in past encounters [3][4]. Comparable cases show that when the crowd-implied probability drops to 0%, it typically reflects either a mismatch in the specific market condition (such as a player not being on the pitch) or a consensus that the event is impossible under current team lineups, rather than a general lack of confidence in the home side’s overall performance.

Traders should monitor official lineups released before kickoff and any in-game announcements regarding substitutions or injuries, as these directly impact market outcomes. Recent match previews confirm this is St. Louis’s first competitive game since the FIFA World Cup break, meaning player fitness and rotation decisions will be critical catalysts [6]. With tickets available from $30 and the match broadcast on Apple TV, real-time updates during the game will provide the final data needed to assess whether the 0% probability holds or shifts [7].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.