Beijing Ducks vs. Shanghai Sharks

Platform comparison

Market context

The Beijing Ducks and Shanghai Sharks are due to meet in CBA playoff semi-final action on 22 May, with overtime counting if needed. The market is currently priced at 0% YES, which is a clear outlier against the live competitive context: Shanghai have already taken the series lead in recent play, including an 81-66 win on 20 May, while the teams have traded results across the last five meetings. In a best-of-series setting, that sort of form usually produces a market with meaningful two-way flow, so a zero quote is more likely to reflect missing liquidity than a settled view on the game itself.

Comparable CBA basketball markets tend to deepen only when deposits clear quickly and traders can move funds without friction. Where funding is simple, through card top-ups or bank rails such as SEPA, order books usually widen earlier; where users rely on slower withdrawals or higher-friction on-ramp steps, participation drops and stale prices can persist longer. USDC rails often matter for speed, but only if the exchange flow is already in place, because liquidity follows the easiest deposit path rather than the strongest pre-match opinion. That makes the current price more useful as a read on access and book depth than on the match outcome alone.

For catalysts, watch for final team news, any schedule change, and confirmation that the game will start as listed. A live listing on Sofascore shows the fixture as starting on 22 May at 11:35 UTC, and recent coverage of Game 3 indicates Shanghai’s momentum in the tie. Any late postponement would keep the market open until completion, while a cancellation without a make-up would push the settlement to 50-50. In practice, those operational updates matter because they determine whether fresh deposits and withdrawals keep cycling into the market before tip-off.

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Methodology

This page reviews Beijing Ducks vs. Shanghai Sharks across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, 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.

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 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.

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.