MLB: Highest ABS Challenge Success Rate (Team)

Platform comparison

Market context

The 2026 MLB Regular Season will determine which team achieves the highest win percentage on Automated Ball-Strike (ABS) challenges, with a tie-breaker favouring the squad with more total successful challenges, then alphabetically first. On Polymarket, this contract currently trades at 36% for the "YES" outcome, reflecting the crowd’s assessment that the leading team will be identifiable within the settlement window ending 11 October 2026. The market is settled on-chain using USDC on the Polygon network, employing conditional tokens that lock liquidity until the official MLB data confirms the winner.

Historically, ABS challenge success has hovered near 51–52%, with 2025 showing a 52.2% success rate across 1,182 challenges and early 2026 data at 51.61% from 124 attempts[1]. Teams lose challenge privileges after two incorrect attempts, a rule that has consistently pressured managers to be selective, often resulting in win rates clustering tightly rather than diverging wildly[2]. This tight distribution suggests that the current 36% probability may underestimate the volatility in early-season performance, where a few high-profile overturns could propel a team to the top.

Traders should monitor weekly MLB ABS tracker updates, particularly player-specific success rates by position—catchers lead at ~56–58%, hitters at ~50–52%, and pitchers at ~48–50%[10]. Key catalysts include the release of the July 8 data update, which already ranks William Contreras (MIL) at 53.2% success[8], and any announcements regarding rule tweaks or umpire training adjustments that could shift overturn frequencies. As the season progresses, the dependency on team strategy and player discipline will become the primary driver of the final ranking.

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 Kalshi UK, which mirrors the Polymarket order book directly.

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

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'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 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.