PortlandFire vs. Chicago Sky

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Market context

The underlying event is the WNBA match between the Portland Fire and the Chicago Sky, scheduled for 8:00PM ET on 24 June at Wintrust Arena in Chicago. The game has already concluded, with the Chicago Sky defeating Portland 101–78, confirming the market will resolve to "Chicago Sky" [2]. This outcome aligns with the crowd-implied probability of 0% for Portland winning, reflecting the Sky’s dominance despite their own struggles earlier in the season.

Historically, prediction markets on completed games with clear final scores rarely show divergence between implied probabilities and actual outcomes, especially when one team wins by a margin exceeding 20 points. In comparable WNBA contracts from the 2025 season, markets where the home team won by 23+ points resolved with 98% accuracy to the winner, with no instances of reversal due to overtime or scoring disputes [1]. The current 0% Portland probability is therefore consistent with both the final score and the broader pattern of reliable resolution in such scenarios.

Traders should monitor official WNBA confirmations of game completion and any post-match injury reports that might affect future lineups, though these will not alter this market’s resolution. The Sky’s recent six-game losing streak prior to this win, including a 23.3% shooting performance against Connecticut, underscores the volatility of their form, yet this single result overrides prior trends [1]. ESPN’s game summary confirms the final score and the absence of overtime, eliminating ambiguity in the settlement [2]. No further announcements are expected to impact this contract, as the game is settled.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track PortlandFire vs. Chicago Sky on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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 Best Prediction Markets, 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.

Is this market available outside the US?

Best Prediction Markets is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

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.