AI marketplaces are evolving, with human elements still critical to their success. Trust and network effects are foundational, but AI technologies are streamlining processes like intake, matching, and transaction preparation. This shift leads to lower friction and faster growth, though challenges around costs, particularly those associated with human oversight and retention, persist. Jack Greco, co-founder of ACV Auctions, illustrates how his company disrupted the wholesale auto market by prioritizing buyer needs, standardizing vehicle data, and providing guarantees, all of which fostered trust and rapid growth. The article outlines specific trends within vertical marketplaces, emphasizing the importance of adopting AI to enhance user experience. Instead of traditional onboarding, marketplaces should focus on outcomes, measuring efficiency from the first action rather than feature familiarity. Operators are urged to define their workflows tightly, use vertical-specific data, and rethink pricing strategies to charge based on outcomes rather than user counts. Trust remains a key concern, especially with AI's potential for errors. Reinforcing human oversight in critical areas helps maintain confidence in the marketplace. Greco's experience with ACV highlights the necessity of a buyer-first approach, which mitigates uncertainty by providing reliable vehicle inspections. The company's successful scaling relied on targeting local markets and gradually establishing a presence in each region. Key takeaways include the importance of standardized condition reporting and building trust through explicit guarantees. The article suggests that AI can handle repetitive tasks, allowing humans to focus on complex negotiations and disputes. For aspiring founders, the article offers a blueprint for launching AI-driven marketplaces. It encourages identifying unique inventory types, operationalizing pricing strategies, and leveraging local market dynamics. Founders should establish clear metrics to measure trust and operational performance while ensuring human involvement in critical decision-making processes. Speed and local engagement are highlighted as essential strategies for gaining traction and building lasting relationships in these specialized markets.