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

Platform comparison

Market context

Donte Johnson meets Eric McConico in a middleweight prelim bout at UFC 330, with the market pricing McConico at 26% and the wider market still leaning Johnson’s way. Sportsbook and model comparisons put Johnson roughly in the 64% to 72% range, while McConico sits closer to 28% to 36%, so the current crowd figure is only modestly below the low end of that band.

That gap fits the usual pattern in UFC prelims where public money often trails the sharper end of the board, especially when a bout has been rebooked and the moneyline has already moved. Recent pricing has clustered around Johnson -245 to -310 and McConico +200 to +250, with some no-vig and model estimates nearer 67% for Johnson and 33% for McConico. The contract therefore looks more conservative than some books, but not an obvious outlier against the consensus.

The main catalysts are the official weigh-in, any late card reshuffles, and whether the bout stays on the scheduled early-prelims slot. UFC resolution depends on the official result, so a draw, no contest, cancellation, or postponement beyond 29 August would push it to 50-50. With settlement ending in the early hours of 16 August UTC, traders are mostly exposed to same-day UFC announcements rather than longer-dated card risk.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi vs Polymarket trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.