Beijing Ducks vs. Shanghai Sharks

Platform comparison

Market context

Beijing Ducks and Shanghai Sharks meet in Game 4 of their CBA semi-final series, with the market currently pricing Beijing at 0% YES, which effectively leaves Shanghai as the clear favourite by consensus. That is a stark read, but it is consistent with the recent head-to-head pattern: Shanghai won 99-88 on 20 May and 81-66 on 20 May in the same playoff set, while Beijing’s best recent counterpoint was a 99-88 win earlier in the series. In handicapper terms, the “value” question is not about whether Beijing is broadly stronger on paper, but whether the market has overcorrected after two Shanghai wins and is now treating the result as near-certain rather than series-dependent.

For traders, the main catalyst is lineup and availability news around tip-off, plus any indication of rotation changes after the last game’s margin. This is a completed-on-the-night market, so postponement risk only matters if the CBA or venue issues force a schedule slip; otherwise the decisive driver is who is confirmed active and whether either side changes pace after the recent scoring swings. The consensus sits firmly with Shanghai, but any late Beijing injury upgrade, Shanghai rest decision, or venue-driven adjustment would be the kind of development that creates a contrarian angle. Recent live-score and preview pages have all pointed to the same fixture on 22 May, with the matchup still scheduled for the 7:35am ET slot.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Beijing Ducks vs. Shanghai Sharks 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

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

Is this market available outside the US?

PolyGram 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.

What does it cost to trade on PolyGram?

Zero. PolyGram 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, PolyGram 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.