MLB: Highest ABS Challenge Success Rate (Team)

Platform comparison

Market context

The 2026 MLB Regular Season is now underway, with teams competing to secure the highest automatic ball-strike challenge win percentage. This market bets on which franchise will lead the league in challenge success by the settlement deadline in October 2026, currently implying a 36% probability for the "YES" outcome. Unlike traditional win-loss records, this metric hinges on the precision of umpire reviews and the strategic timing of appeals by players and coaches.

Historical data from the system’s first three weeks reveals stark disparities in team performance, with nine clubs exceeding a 60% success rate while the Cincinnati Reds dominate at 72% [1]. This early divergence suggests that a 36% implied probability may understate the volatility of the leaderboard, as a single team’s sustained excellence could rapidly shift odds. Comparable spring training data also highlighted catchers achieving a 60% overturn rate, indicating that specific positional strengths often drive overall team success [4].

Traders must monitor weekly ABS challenge dashboards for emerging trends in challenge frequency and situational success, as these metrics directly correlate with final rankings [2]. Key catalysts include roster announcements for teams with high challenge rates and adjustments to pitching strategies that may reduce appealable pitches. Recent tracker updates show William Contreras leading individual success metrics, suggesting that star player performance could be a decisive factor for his team’s overall standing [9]. Consistent monitoring of these dependencies will clarify whether the current probability aligns with the evolving competitive landscape.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, 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?

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 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 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.