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

Platform comparison

Active sub-markets

Market context

Cody Brundage and Andre Petroski are booked for a middleweight prelim at UFC Fight Night: Allen vs Costa, with the market keyed to the official UFC result rather than unofficial scorecards. A 100% YES price should be read as a data-quality flag, not a true forecast: once the fight is live or already over, markets can briefly stick at one side because feeds have not yet updated. Programmatically, a trader would treat this as a settlement-check market and wait for the UFC announcement, then reconcile against any later bout correction, no contest, or scorecard amendment before expiry.

The recent framing is straightforward: the pair have already been matched in a UFC prelim context, and the event listing confirms the bout window. Sofascore lists the fight start for 16 May 2026 at 21:00 UTC, while Sherdog’s post-fight clip headline says Brundage stopped Petroski, which is the kind of source that can move copy-trading systems but should still be confirmed against the UFC result feed before acting. Similar middleweight prelim markets tend to resolve on official bout status quickly, but late changes matter: doctor stoppages, overturned results, or a no contest would all flip settlement away from a simple winner call.

Sources: 1 · 2 · 3 · 4

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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

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.

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.