UFC Fight Night: Malcolm Wellmaker vs. Juan Diaz (Bantamweight, Main Card)

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Active sub-markets

Market context

UFC’s bantamweight main-card bout between Malcolm Wellmaker and Juan Diaz has effectively been priced at zero on Polymarket, with the market showing 0% YES on Wellmaker despite the fight being scheduled for UFC Fight Night: Allen vs. Costa. For a user buying USDC-denominated conditional tokens on Polygon, that means the contract is currently being treated as if Wellmaker has no chance of official victory, even though the settlement rule is straightforward: the market resolves to Wellmaker if the UFC declares him the winner, and to Juan Diaz if Diaz is the winner.

That 0% reading is hard to reconcile with recent comparable pricing. BetMGM listed Wellmaker around -300 and Diaz around +240, which implies a clear favourite rather than a coin flip. Coverage from BetMGM and The Stats Zone also framed Wellmaker as the more established UFC entrant after a first professional loss, while Diaz arrived unbeaten in UFC debut terms off the Contender Series. In practical terms, Polymarket’s contract price is an outlier versus the wider pre-fight market, so traders tend to read it as either thin liquidity or a stale book rather than a consensus on fight quality.

The main catalysts are whether the bout actually takes place on schedule, any late card movement, and the official UFC result once the fight ends. The market’s special settlement terms matter here: a draw, technical draw, no contest, no score, cancellation, or postponement beyond 30 May would all resolve to 50-50, so live traders should watch for weigh-in status, bout order changes, and official UFC communication around the main card. If the fight proceeds as listed, the only decisive event for settlement is the UFC’s official winner declaration.

Sources: 1 · 2 · 3 · 4 · 5

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

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

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'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.

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.