MLB: Highest ABS Challenge Success Rate (Team)

Platform comparison

Market context

The real-world event at the heart of this market is which Major League Baseball team will achieve the highest percentage of successful automatic ball-strike (ABS) challenges during the 2026 regular season. In prediction markets, a YES share represents a bet that the stated outcome will occur, while a NO share bets it will not; here, a YES share wins if the team you are backing finishes with the top challenge success rate. With the crowd-implied probability at 36% for YES, the market suggests the outcome is uncertain but not improbable, reflecting the competitive nature of challenge success across the league.

Historical data from the first three weeks of the 2026 season shows that nine clubs have already surpassed a 60% success rate, with the Cincinnati Reds leading the pack comfortably [1]. Over this period, players won 54% of their challenges overall, meaning overturns happen more often than half the time [1]. This early variance frames the current 36% probability: while some teams are excelling, the league-wide average remains modest, and no single team has yet established a dominant, unassailable lead that would make the outcome certain.

Traders should monitor weekly ABS challenge trackers for shifts in team rankings, particularly as the season progresses toward October [9]. Key catalysts include announcements of rule tweaks by MLB, changes in umpire crews that might affect challenge success, and the performance of high-confidence players like William Contreras, who currently holds a 53.2% success rate [9]. Additionally, teams with aggressive pitching staffs or batters who challenge frequently may see their success rates fluctuate, making schedule density and player health critical dependencies to watch [5]. Recent spring training data indicates challenge rates align with Triple-A levels, suggesting consistency but also room for volatility as the regular season unfolds [4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track MLB: Highest ABS Challenge Success Rate (Team) 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

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.