Amazon has blocked Meta’s Muse personal AI agent from browsing and purchasing products on its marketplace, citing usage-term, security and user-experience concerns, while Meta and Shopify plan to let Muse connect users with Shopify-powered stores and complete purchases through Shop Pay. Separately, Meta executives are promoting user-reported savings from Muse, including insurance negotiations, subscription refunds, discounts and recovered funds. The dispute became public less than two weeks after Muse launched on September 8, as the app reached No. 1 among free or downloaded apps in the U.S. Apple and Google stores. Meta shares closed 11.43% higher at $741.24, while Shopify closed at $137.92, up 7.33% in the newer account; an earlier account reported a 7.83% Shopify gain. The developments underscore a broader contest over agentic commerce, customer relationships, shopping data and access for third-party AI assistants.