<div><img width="300" height="167" src="https://readwrite.com/wp-content/uploads/2026/09/kalshi-hits-15-66b-combination-bets-weekly-trading-300x167.webp" class="attachment-medium size-medium wp-post-image" alt="Editorial illustration of prediction-market trading growth led by Kalshi and combination bets" style="width:100%;height:55.81%;max-width:1376px;margin-bottom: 15px;" decoding="async" fetchpriority="high" srcset="https://readwrite.com/wp-content/uploads/2026/09/kalshi-hits-15-66b-combination-bets-weekly-trading-300x167.webp 300w, https://readwrite.com/wp-content/uploads/2026/09/kalshi-hits-15-66b-combination-bets-weekly-trading-900x502.webp 900w, https://readwrite.com/wp-content/uploads/2026/09/kalshi-hits-15-66b-combination-bets-weekly-trading-260x145.webp 260w, https://readwrite.com/wp-content/uploads/2026/09/kalshi-hits-15-66b-combination-bets-weekly-trading.webp 1376w" sizes="(max-width: 300px) 100vw, 300px" /></div>
<p>Prediction market volume reached $19.46 billion for the week as Polymarket US grew 21%, driven largely by combination contracts while Kalshi held 80.5%.</p>
<p>The post <a href="https://readwrite.com/prediction-market-volume/">Kalshi Hits $15.66B as Combination Bets Lift Weekly Trading</a> appeared first on <a href="https://readwrite.com">ReadWrite</a>.</p>