UFC 330: Eric McConico vs. Donte Johnson (Middleweight, Early Prelims)

Platform comparison

Market context

UFC 330’s Eric McConico v Donte Johnson market is trading at 26% YES, which leaves McConico a clear outsider on the contract even before the fight goes live on Polygon in USDC via conditional tokens. For Polymarket users, the key point is that the contract settles only on the UFC’s official result, so the live price reflects both the bout and the risk of a non-finish outcome.

The 26% level sits below several comparable pre-fight signals that have Johnson as the stronger favourite, including sportsbook pricing that has recently shown Johnson in the mid-70s implied range and fight cards listing the bout as a scheduled middleweight prelim. That kind of gap is typical in markets where one side is seen as the likelier winner, but a decent minority still prices in upset and stoppage variance, especially for a short-notice or lightly proven pairing.

The main catalysts are straightforward: the fight is on the UFC 330 card in Philadelphia, scheduled for 15 August 2026, and the market resolves from the official UFC decision after the bout. Traders will be watching whether the bout stays on the early-prelims schedule, whether any late card reshuffle or medical issue emerges, and whether the result is a clean decision, stoppage, or a no contest/draw, since that last branch would push the contract to 50-50.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track UFC 330: Eric McConico vs. Donte Johnson (Middleweight, Early Prelims) across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.