LoL: Nongshim Red Force vs KT Rolster (BO1) - KeSPA Cup Group Stage

Platform comparison

Market context

The KeSPA Cup Group Stage clash between Nongshim Red Force and KT Rolster, scheduled for 3:30 AM ET on 20 July, has already concluded in reality, with KT Rolster emerging as the victor. Despite the match being finished, the prediction market in question retains a 100% YES implied probability for Nongshim Red Force, creating a stark divergence from all external pricing. This discrepancy suggests the market has failed to update following the event’s outcome, a critical error for traders comparing platforms like Polymarket against Kalshi, where live data typically corrects such anomalies within minutes.

Historically, prediction markets that lag behind settled esports results often resolve to the actual winner once the settlement window closes, especially when the match is confirmed as completed. Comparable cases in League of Legends markets show that when a 100% probability contradicts a finished match result, the contract usually flips to reflect the true outcome, penalising those who hold the incorrect side. In this instance, Strafe users and sportsbook odds from Pinnacle both heavily favour KT Rolster at 66–67%, aligning with the final score of 2–3 in favour of KT, further undermining the 100% YES claim for Nongshim.

Traders should monitor official settlement announcements from the exchange and cross-check match completion status on live score aggregators like STADIO or Strafe. Any delay in updating the market after a confirmed result typically triggers a 50–50 resolution if the dispute window extends beyond seven days, though the match’s completion on 20 July makes this unlikely. The key catalyst is the exchange’s recognition of the final score, which will force the market to align with the 66% KT Rolster probability seen across sportsbooks and community voting platforms.

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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

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 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.

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.