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

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Market context

Cody Brundage is scheduled to face Andre Petroski at UFC Fight Night on the prelims, and Polymarket is pricing the conditional token at 100% YES, implying the market is effectively at the upper bound on the Brundage outcome. On Polygon, that means the USDC-settled contract is trading as if Brundage’s official win is already locked in, even though the market will only resolve from UFC’s declared result. If the bout is changed to a no contest, draw, or is otherwise not scored, the token would not settle to Brundage and would instead fall into the 50-50 outcome under the contract rules.

The most relevant frame is the first meeting between these two, which UFC Stats records as Brundage beating Petroski by majority decision at UFC Fight Night: Allen vs Costa, with Brundage landing 43 of 60 significant strikes to Petroski’s 8 of 17. That history matters because it gives the matchup a recent, official baseline, but it does not remove fight-night execution risk in a middleweight pairing where grappling exchanges and top control can swing judging. BetMGM’s pre-fight write-up had Petroski as a sizeable favourite, underscoring that pre-fight markets and in-fight outcomes can diverge sharply in this division.

For traders, the key catalysts are the UFC’s official bout result, any late change to the card, and whether the contest reaches the judges. The settlement window is tight and closes at 2026-05-17T03:59:59.999Z, so the practical risk is less about long-run form and more about whether the prelim starts on schedule, finishes cleanly, and is formally recorded by the UFC. A late cancellation, doctor stoppage before a scorecard, or a post-fight ruling change would be more important to the contract than pre-fight opinion or betting market chatter.

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Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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'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.

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.