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

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Active sub-markets

Market context

Cody Brundage’s middleweight prelim against Andre Petroski is the underlying event, and the market is effectively pinned at a full yes. That makes the real issue not fight price discovery but whether enough money can still flow in to keep the book deep before settlement. In markets like this, the dominant effect is usually funding friction: traders who can deposit quickly by card, Klarna, SEPA or USDC are the ones who can still react to late line-ups, while slower rails tend to leave the order book thin and one-sided.

Comparable UFC fight markets often harden close to 100% when the bout has been confirmed, starts within hours, and the crowd has already absorbed the matchup news. In that setting, the only meaningful residual risk is a resolution edge case such as a no contest, draw, or late cancellation. The current price implies the market is treating those outcomes as negligible, but that can also reflect limited fresh participation rather than true conviction if onboarding is awkward or withdrawal options are slow. Where fiat deposits clear instantly and crypto rails are available, these short-dated markets tend to see more late volume and narrower spreads.

For traders, the catalysts are operational rather than sporting: official UFC confirmation that the fight has started and, if needed, any late commission or broadcast updates that could affect whether the bout is actually scored. The key watchpoint is whether the prelim proceeds inside the settlement window; if it does, the market should resolve on the official result quickly. Recent fight-night previews, including reporting from The Stats Zone and pre-fight video commentary, suggested the bout was set as a standard prelim matchup, with no major scheduling doubt, which supports the current near-certain pricing.

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.

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.

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.