MLB: Stolen Bases Leader

Platform comparison

Market context

The 2026 Major League Baseball regular season will determine which player steals the most bases, with the market resolving to the official leader if ties occur, applying caught stealings, on-base percentage, and other metrics as tiebreakers.

Historical patterns in stolen base races show that top favourites often face steep competition from emerging speedsters, with projections frequently splitting between two or three players. In 2026, Elly De La Cruz is the betting favourite at +300, implying a 25% chance, while FanGraphs’ ATC system projects him and Chandler Simpson to lead with 41 stolen bases each[1][4]. Yet the Polymarket crowd assigns 27% probability to both Bobby Witt Jr. and Nasim Nuñez, diverging sharply from sportsbook lines and analyst consensus[2]. This gap suggests traders are betting on late-season surges or injury-driven opportunities rather than current form.

Traders should monitor mid-season roster moves, especially for teams with high stolen base volume, and watch for any announcements regarding player health or role changes. Recent projections from FantasyPros still rank De La Cruz and Simpson as leaders, but volatility remains high as the season progresses[4]. With the settlement window closing on 28 September 2026, the 8% implied probability for the current market outcome appears unusually low compared to both sportsbook favourites and crowd-driven platforms, indicating a meaningful divergence in risk assessment across markets[1][2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews MLB: Stolen Bases Leader across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi vs Polymarket, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 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 fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

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