Beijing Ducks vs. Shanghai Sharks

Platform comparison

Market context

Beijing Ducks and Shanghai Sharks are due to meet again in the CBA semi-final series, with the market set to resolve on the official final score including overtime. The live context matters: Shanghai have already shown they can win on Beijing’s floor, taking Game 3 by 99-88 on 20 May after a 66-81 result in the same matchup, which has been enough to move a 0% crowd-implied probability away from being merely theoretical. Earlier head-to-head results in the same run have been mixed, including Beijing’s 87-82 win on 15 May and Shanghai’s 86-67 win in January, so the recent pattern is not one-way.

For comparison-platform traders, this is the sort of event where Polymarket’s binary YES/NO format can look simpler than a book-style price, while Kalshi, Betfair and Smarkets may present the same view as a decimal or exchange-implied probability with fees and, in some cases, different access rules. On a tightly priced playoff game, commissions and spread matter more than the headline number: Betfair and Smarkets typically charge a trading commission, whereas Kalshi’s pricing is exchange-like but still subject to platform and jurisdiction limits, and KYC reach can differ materially. The key catalysts are straightforward: team sheets, any late injury or rest news, and confirmation of the fixture time if scheduling shifts within the playoff window. Flashscore and Sofascore both list the game for 22 May, while recent YouTube live coverage of the series underlines that the matchup has been active and not in doubt; postponement would keep the market open, but cancellation without a make-up would force a 50-50 resolution.

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

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.

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'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.

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.