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

Platform comparison

Market context

Donte Johnson and Eric McConico are scheduled to meet in a middleweight bout on the UFC 330 card in Philadelphia, with the fight placed on the prelims rather than the main card. In prediction-market terms, a YES share on McConico means he is officially declared the winner; a NO share means Johnson wins. If the bout is a draw, no contest, not scored, cancelled, or pushed back beyond the market’s cutoff, it settles 50-50 instead.

The 26% YES price implies McConico is the outsider, while Johnson is being treated as the more likely winner. McConico’s listed record on fight cards is 11-4-1, compared with Johnson’s 8-0-0, so the market is pricing in both Johnson’s unbeaten record and the usual uncertainty around late-card MMA match-ups. That said, prediction markets can move sharply on weigh-in reports, late injury news, or any change to the bout order.

For traders, the key catalysts are simple: whether the UFC keeps the bout on the card, whether either fighter makes weight, and whether the official result is issued on the night by the UFC. Recent UFC listings and fight-card coverage show the bout scheduled for the early prelims under the UFC 330 banner, alongside a full event headlined by Islam Makhachev versus Ian Machado Garry, so any changes to the wider card could affect whether the fight goes ahead as planned.

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.

UK Frequently Asked Questions

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.