This directory lists the major online auction platforms specializing in trading cards, including sports cards, Pokémon, and other TCG collectibles. Each entry includes the platform name, direct links to their website and active listings, regional availability, and the types of cards most commonly sold. Platform type (auction, fixed-price, or hybrid) and closing method are documented where confirmed. Data is sourced through direct research of each platform’s public website and listings pages. This directory is updated on a rolling basis as new platforms emerge or existing ones change their formats. Use the filters to narrow results by card category or platform type.