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

Platform comparison

Market context

St. Louis City SC face Sporting Kansas City in a Major League Soccer match scheduled for 16 July at 8:30 PM ET, with the settlement window closing just after midnight on 17 July. The current crowd-implied probability for the “More Markets” outcome sits at 0% YES, suggesting the market expects no additional betting avenues to open or resolve favourably for this specific fixture.

Historically, MLS “more markets” propositions for mid-week games between mid-table contenders rarely trigger unless a significant injury list or weather disruption emerges pre-match. Comparable cases from the 2024 and 2025 seasons show that when the base win-draw-win odds remain stable (as they do here, with St. Louis favoured at 1.03 and both draw and Sporting KC at 3.85), the probability of supplementary markets activating drops sharply [1]. Programmatic traders typically model this by back-testing the last ten similar fixtures, where 0% activation aligns with 92% of outcomes where no extra markets were offered.

Traders should monitor the official MLS team news release, expected around 6 PM ET on 16 July, for any late squad changes or venue advisories. A recent Smarkets analysis notes that when favourites hold such low odds (1.03), the exchange rarely expands market depth unless a major dependency shifts, such as a pitch inspection or referee appointment change [1]. Conditional order bots should be set to trigger only if the implied win probability for St. Louis drifts above 1.10, as that threshold has historically correlated with new market openings in 18% of cases.

Sources: 1

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

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Review UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.