UFC Fight Night: Cody Brundage vs. Andre Petroski (Middleweight, Prelims)

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Active sub-markets

Market context

Cody Brundage is scheduled to face Andre Petroski in a middleweight prelim at UFC Fight Night: Allen vs Costa, and the market is pricing a 100% YES outcome, which effectively assumes the bout goes ahead and produces an official winner. That leaves little room for a contrarian view on the winner line, but it does not eliminate settlement risk: if the fight is scrapped, ruled a no contest, or otherwise not scored, the market would resolve 50-50 rather than on the fighter named in the title.

From a handicapper’s angle, the consensus has to be read against the shape of the matchup rather than the raw probability. Brundage has often been involved in volatile fights, with finishes and scrambles more common than long, technical decisions, while Petroski has historically been the more grappling-led, methodical operator. That contrast usually supports either side depending on who can impose their phase first, which makes a hard 100% probability look more like an event-confirmation price than a true skill-based edge. In comparable UFC prelim spots, markets can overstate certainty when the bout is formally on the card but still exposed to late-week disruption.

The main catalysts are official UFC bout status updates, weigh-in results, and any late cancellation or replacement news before the settlement window closes at 03:59:59.999 UTC on 17 May. Sofascore listed the fight start time as 21:00 UTC on 16 May, while recent preview content and highlight listings have already treated the pairing as active, but the only resolution source that matters is the UFC’s official result. The value angle, if any, is not in picking a side against a 100% YES consensus, but in monitoring whether the market is effectively trading a live bout or merely assuming one that could still be altered.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track UFC Fight Night: Cody Brundage vs. Andre Petroski (Middleweight, Prelims) 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

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.

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.

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.