UFC Fight Night: Khaos Williams vs. Nikolay Veretennikov (Welterweight, Prelims)

Platform comparison

Active sub-markets

Market context

Khaos Williams and Nikolay Veretennikov are scheduled to meet in a welterweight prelim at UFC Fight Night: Allen vs Costa, with the market set to resolve on the official UFC result. A 100% crowd-implied probability on Williams is more a reflection of the market’s current balance than a genuine certainty: in similar UFC moneyline-style events, early liquidity can produce one-sided pricing even when a late change, injury or weigh-in issue could still move the bout. On comparison platforms, the same fight may be shown as decimal odds rather than implied probability, so a short-priced favourite can look less extreme on Betfair or Smarkets than on a binary market. Fees also matter: exchange commission reduces net returns, while any book-style price will embed margin, and access differs because KYC, jurisdiction and product eligibility vary by platform.

Recent preview coverage has framed this as a competitive welterweight pairing rather than a mismatch. BetMGM listed Williams as a modest favourite at -120 and Veretennikov at +100, while noting both men were on late notice, which usually increases volatility and makes official weigh-ins and final bout announcements the main catalysts to watch. That matters for settlement because a no contest, technical draw, cancellation or postponement beyond 30 May would push the market to 50-50 regardless of pre-fight pricing. Traders should also watch for any UFC update on the prelim order or commission paperwork, since these markets hinge on the bout actually taking place and the official winner being recorded by UFC.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares UFC Fight Night: Khaos Williams vs. Nikolay Veretennikov (Welterweight, Prelims) specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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 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 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.