MLB: Stolen Bases Leader

Platform comparison

Active sub-markets

Market context

The real-world event is the 2026 Major League Baseball regular season, which will determine the player who accumulates the most stolen bases by the settlement deadline in late September. Current market data shows Nasim Nuñez leading with 31 steals, closely followed by Bobby Witt Jr. with 28, creating a tight contest where the 8% implied probability reflects the uncertainty of a potential tie or a late-season surge by a projected leader like Elly De La Cruz, who is forecasted to reach 41 steals [1][4][6].

Historically, stolen base leaders often emerge from players with high speed and low caught-stealing rates, where the tie-breaker rules favouring fewer caught stealings can shift the outcome significantly if the top contenders are within a single steal of each other. Programmatic traders should monitor daily stat updates and injury reports, as a single missed game for a top contender like Nuñez could allow a faster player to overtake the lead, while conditional orders based on projected totals from sources like FantasyPros can automate exposure to emerging leaders [1][6].

Key catalysts include the remaining schedule for each contender, as teams with more games left in September offer a statistical advantage for accumulating steals, and any announcements regarding roster changes or playing time that could affect a player's opportunity to attempt steals. Traders should watch for real-time updates on caught-stealing counts, as the tie-breaker rule prioritising fewer caught stealings is a critical dependency that could resolve the market in favour of a player with fewer attempts but higher efficiency, a factor often overlooked in manual analysis [1][3]. Recent projections suggest that players like Chandler Simpson and Jose Caballero could challenge the current leaders if they maintain their current pace through the end of the season [6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track MLB: Stolen Bases Leader 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 Polymarket App UK, 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.

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 it cost to trade on Polymarket App UK?

Zero. Polymarket App UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

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