UFC Fight Night: Steven Asplund vs. Guilherme Pat (Heavyweight, Main Card)

Platform comparison

Market context

Steven Asplund’s heavyweight bout with Guilherme Pat is the kind of market where the price has already done much of the work: UFC-facing books have generally made Asplund a clear favourite, with a recent average around -300 to -305 and Pat around +240 to +260, which translates to roughly a three-in-four chance for Asplund after removing vig.[1][9][15] That is notably tighter than the 100% YES crowd-implied reading on the current market, so the main comparison point for Polymarket versus Kalshi, Betfair or Smarkets is not direction but scale: Kalshi is quoted in cents and shows Asplund around 72-73¢, while Polymarket has been lower, around 70¢ in the live market snapshots, even though both are pointing to the same favourite.[4][7][12][14]

Comparable cases suggest heavyweights with a strong moneyline favourite can still carry outcome risk because one clean sequence can flip the result, but the market is currently pricing Asplund as the more probable winner rather than a near-lock.[3][17][18] That matters for platform comparison because exchange-style venues such as Betfair and Smarkets typically express the same belief through decimal prices and take a commission on winnings, whereas Polymarket and Kalshi quote direct probability-style prices and differ more on access, KYC, and who can trade than on the underlying fight view. The current gap between sportsbook-derived probabilities and the crowd price is the key read-through: if the market stays at or near 100%, it implies either very thin liquidity or an unusually one-sided thesis that is stronger than the broader betting board.

The main catalysts are straightforward: weigh-in and bout-night confirmation, any late injury or commission issue, and the official UFC result at settlement, since this market resolves only from UFC’s declared outcome.[4][12] The fight is scheduled for the UFC Fight Night card on 8 August 2026, with the market’s settlement window running to 9 August 2026 03:59:59.999Z and a fallback to 50-50 if the bout is cancelled, ruled no contest, not scored, or pushed beyond the stated grace period.[4][12] Traders on Polymarket versus Kalshi should also watch whether either venue updates contract depth or spreads closer to start time, because Kalshi’s 72/28 style quotation and Polymarket’s lower cents price can diverge even when the underlying event has not changed.[4][12][14]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares UFC Fight Night: Steven Asplund vs. Guilherme Pat (Heavyweight, Main Card) specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.