Canadian TCG Exchange - Trading Card Game Marketplace

Overview

Canadian trading card sellers had no domestic peer-to-peer marketplace, so they used TCGPlayer in the US or CardMarket in Europe and absorbed the cross-border fees and shipping costs. I built CTCGX from scratch as the Canadian alternative, with a 200,000-card catalog across eight TCGs, Stripe Connect escrow payments, multi-carrier shipping through EasyPost, and bi-directional Shopify inventory sync so existing storefronts could plug in without rebuilding their operations. The platform processes real transactions across Pokemon, Magic, Yu-Gi-Oh, Lorcana, and four other major card games. Underneath, the stack runs on NestJS, Next.js, PostgreSQL, and Redis, with a REST API, webhooks, and an MCP server for AI-driven inventory management.

What it does

• Any user can open a storefront with team roles and permissions, then start selling across a 200,000-card catalog spanning Pokemon, Magic: The Gathering, Yu-Gi-Oh!, Disney Lorcana, Flesh and Blood, One Piece, Star Wars: Unlimited, and Riftbound.
• Stripe Connect handles escrow payments with automated fund release and per-seller platform fee overrides, so sellers get paid only after buyers confirm.
• Multi-carrier shipping through EasyPost generates labels and tracking across Canada Post, UPS, FedEx, Purolator, DHL, and UniUni.
• Sellers can connect existing Shopify stores and keep inventory synchronized across both platforms automatically, with no manual reconciliation.
• A public REST API with webhooks and an MCP server lets sellers integrate AI agents and external tools into their inventory workflow.
• OAuth sign-in across Google, Microsoft, LinkedIn, and Discord pairs with session-based security and CSRF protection.
• Admins moderate listings, manage stores, and review platform analytics from a dedicated panel, while buyers and sellers receive real-time order updates through Server-Sent Events and lifecycle emails.

Stack