Beijing Ducks vs. Shanghai Sharks

Platform comparison

Market context

Beijing Ducks and Shanghai Sharks are due to meet in the CBA play-offs on 22 May, with the result settled on full-time score including overtime. The market’s 0% YES price is hard to reconcile with the recent series context: the teams have split the first two games, with Shanghai winning 86-67 on 20 May and Beijing taking the earlier meeting 88-99, while their regular-season and earlier head-to-head results were also mixed. That sort of back-and-forth usually keeps the series live rather than pointing to a one-sided outcome, which is why a zero-implied price looks more like stale or misloaded contract pricing than a true read on the game.

For platform comparison, Polymarket and Betfair would typically express this as a probability, whereas Kalshi-style markets are often quoted in dollar terms that map to implied odds, and Smarkets/Betfair add fee and commission differences that matter if the line is tight. Access also varies: Polymarket is generally open without full KYC in many jurisdictions, while Kalshi and Betfair have stricter identity and location checks, so the same match can be easier to reach on one venue than another. On a live domestic play-off market like this, the useful comparison is not just the headline number but whether the exchange price reflects a tradable probability after fees, or merely an indicative decimal price with wider execution slippage.

The main catalysts are team news, venue confirmation, and whether the game starts on schedule; the market stays open if postponed and only resolves 50-50 if cancelled with no make-up. A recent YouTube broadcast of Game 3 on 20 May noted the series was level at 1-1 before Shanghai pulled away after a strong first quarter, which is consistent with the idea that the next result depends on form swings rather than a clear series lock. Traders should watch for official CBA announcements, late injury updates, and any schedule changes, as those are the only events likely to move a settled 0% price sharply before tip-off.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Beijing Ducks vs. Shanghai Sharks from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). PolyGram routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

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.

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.

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.