Quick answer: A stolen bases prop is a wager on whether a hitter will record more or fewer stolen bases than the sportsbook’s posted line in a single game. Lines typically sit at 0.5 (will the hitter steal any?), occasionally at 1.5 for elite speedsters like Bobby Witt Jr. or Esteury Ruiz. The market grades on official MLB stolen bases, which excludes caught-stealings (those don’t reduce the count, but a successful swipe is required to cash the over). Pricing is usually +200 to +500 because per-game stealing is rare, even for fast hitters.
What Counts as a Stolen Base
A baserunner who advances from one base to another by his own action without the help of a hit, error, walk, or other batter event. Pickoffs that result in advancing don’t count. Defensive indifference (where the catcher doesn’t even attempt the throw) is sometimes ruled a stolen base by the official scorer, sometimes not. Wild pitches and passed balls advancing the runner do NOT count as stolen bases. The runner has to start the action and the catcher has to make the throw (or attempt one).
Stolen Bases Props in the Market
Lines are almost always 0.5 (will the player steal at least one base?). Pricing typically ranges from +200 for elite speedsters in good matchups to +600 for moderate base-stealers in unfavorable spots. Books offer the prop for players with established stolen-base tendencies (Witt Jr., Ronald Acuna Jr. when healthy, Trea Turner, Esteury Ruiz). Most starters don’t have SB props because their season totals are too low to price meaningfully.
The Sharp Strategy
The single biggest variable is opportunity. A hitter has to be on first base to steal second. Reaching base ~3 times per game (typical for elite hitters) creates 3 opportunities. The opposing catcher’s caught-stealing rate matters next. Some catchers (Patrick Bailey, Will Smith) have elite arms that suppress stealing attempts. Others (J.T. Realmuto, Salvador Perez in down years) get tested constantly. PropsBot’s MLB model has graded 101,881 props with 31.7% verified ROI on the High ROI Signal partly by tracking opportunity-driven props like stolen bases. The other consistent edge: identifying matchups where pitchers have slow delivery times, which boosts stolen-base probability.
A Worked Example
Bobby Witt Jr.’s standard line is 0.5 stolen bases at +250. He’s leading off against a starter with a 1.45-second delivery time (slow), and the catcher behind the plate has a 22% caught-stealing rate (well below league average). Model projects 65% probability Witt steals at least once. Implied probability at +250 is 28.6%. That’s 36-point edge. Over a sample of 100 such bets, expected ROI is enormous. The opposite trap: betting Witt over against a quick-delivery pitcher and elite-arm catcher combo, where the matchup math says the under at -350 is the value.
Frequently Asked Questions
What counts as a stolen base?
A baserunner advancing from one base to another by his own action without help from a hit, error, walk, or other batter event. The catcher has to make a throw (or attempt one in defensive indifference cases).
What’s a typical stolen bases prop line?
Almost always 0.5 priced as a yes/no. Elite speedsters like Witt and Acuna face +200 to +300 in good matchups. Moderate base-stealers price at +400 to +600. The 1.5 line is rare and prices around +500 to +800.
Do pickoff plays count as stolen bases?
No. A runner who advances on a pickoff (catcher’s throw to first goes wild) is credited with a base advance but not a stolen base. Stolen bases require the runner to initiate the action.
What’s the most stolen bases in a game in MLB history?
Six, by Eddie Collins in 1912 and Otis Nixon in 1991. Modern game records are usually 4 in a single game. Most elite speedsters average 0.4-0.6 stolen bases per game.
Are stolen bases props worth betting?
With matchup awareness, yes. The +200 to +400 range often misprices opportunity. Sharp bettors identify pitcher-catcher combinations where stealing probability is meaningfully above the implied probability.
Part of the PropsBot.AI Sports Betting Glossary. Updated 2026-05-04.
