MLB: Highest ABS Challenge Success Rate (Team)

Platform comparison

Market context

The market tracks which MLB team will achieve the highest percentage of successful Automated Ball-Strike (ABS) challenges during the 2026 regular season, with a tie-breaker favouring more total challenges won, then alphabetical order. This system, powered by T-Mobile, debuted in 2026 and overturns 54% of all challenged pitches overall, creating a volatile metric where small sample sizes can skew team rankings significantly [1][3].

Historically, challenge success rates cluster tightly, with only three teams exceeding 63% through May 2026, including the Mets and Chicago clubs, while the majority hover near the 50% baseline [1][6]. The current 36% implied probability for the leading team suggests the market anticipates a narrow margin of victory, consistent with early-season data where catchers lead with ~56–58% success versus hitters at ~50–52% [1][10]. Programmatic traders should model this as a conditional order dependent on challenge frequency, not just success rate, since volume acts as the primary tie-breaker.

Key catalysts include the release of monthly ABS dashboards showing situational breakdowns and any rule adjustments to challenge eligibility [2]. Traders must monitor team pitching rotations, as teams with aggressive bullpens may generate more challenges, directly impacting the tie-breaker metric [4]. Recent data from spring training indicated 1.4% of pitches were challenged, a figure that stabilised through Triple-A in 2025, suggesting a predictable baseline for 2026 volume projections [4]. Automated bots should weight teams with high catcher usage, given their superior overturn rates, while factoring in alphabetical name order as a low-probability but deterministic settlement path [8].

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 Polymarket Bot 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

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Bot UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.