UFC Fight Night: Jesus Aguilar vs. Rei Tsuruya (Flyweight, Prelims)

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Market context

Jesus Aguilar and Rei Tsuruya are scheduled to meet in a flyweight prelim at UFC Fight Night on 30 May, with the market effectively split at 49% for Aguilar. That near-even price fits a matchup where neither man arrives with a dominant recent run: Tsuruya is 10-1 and has already been tested over three rounds, losing a unanimous decision to Joshua Van in March 2025, while Aguilar is 12-4 and has built his UFC profile on grappling-heavy fights rather than clean striking separation. In fights like this, the market often tracks how much weight is placed on activity and strength of schedule versus raw record, especially when both fighters have recent UFC-level exposure but no long unbeaten streak to anchor confidence.

For traders, the main catalysts are confirmation of the bout reaching the cage at the scheduled weight, plus any late camp or roster changes that alter the style matchup. As of current listings, Sofascore has the contest locked for 30 May at 7:00 am UTC, and Tapology and ESPN both have the pairing on the UFC Fight Night card. If either side has a short-notice opponent change, a cancelled prelim slot, or a visible weight-cut issue at the official weigh-ins, that would matter more than the pre-fight market narrative. Aguilar’s recent public UFC footage has also framed him as a grappler against a striker in other bouts, so any new camp comments or broadcast notes on where he has improved against wrestling-heavy opposition would be relevant to how this line moves.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track UFC Fight Night: Jesus Aguilar vs. Rei Tsuruya (Flyweight, Prelims) on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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.

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.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.