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SmartStake / Weekly column

The Closing Line

A weekly column on prediction markets, sharp books, and how prices move, from a working market trader.

Alex Bow/ Editor

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October 2026

  1. 005Oct 12, 2026 / 15 minWho's Actually Sharp on MLB Mainlines After CFTC Recognition?A contributor study of line movement across ten books on 2026 MLB mainlines: which book sets the price, which ones follow it and how fast, and where Kalshi, Polymarket, Novig, and ProphetX land against Pinnacle now that all four are CFTC recognized.

September 2026

  1. 004Sep 23, 2026 / 8 minFinding Fair Value on Prediction MarketsA contributor on finding fair value on exchanges and prediction markets: why a straight devig misleads when liquidity is lopsided, spreads are wide, or taker fees are baked in, and how the EV, arb, and Smart Money tools each read the same market differently.
  2. 003Sep 15, 2026 / 7 minHow Prediction Markets Changed the Way I Bet FuturesA contributor on why prediction markets fixed what long made futures a trap: hold hidden behind one-way boards, punishing cashout terms, and capital locked up for months with no fair exit.

August 2026

  1. 002Aug 28, 2026 / 9 minBet Tennis at the US Open - Everything You Need to KnowEvery tennis match on Kalshi and Polymarket has two markets, one per player, and their prices are often a cent out of line with each other. This guide covers how to work that gap with limit orders, why retirements settle nothing like they do at a sportsbook, and what game spreads really ask for.

July 2026

  1. 001Jul 7, 2026 / 11 minSharpest Sportsbooks for MLB Player Props: 2026 Data StudyWe studied over 600 million MLB player prop line movements and 1.3 million closing lines to rank which sportsbooks are actually sharp. Kalshi and ProphetX come out on top; Bookmaker and Pinnacle are the softest.

About Alex Bow

Alex Bow trades tennis and baseball markets on Kalshi and Polymarket and writes about prediction market structure for SmartStake.