Square

This connects Claude to Square's complete commerce API, covering payments, catalog, inventory, customers, bookings, invoices, and about 30 other services. You get three tools: discover what methods exist for a service, check the parameters a method needs, then execute the actual API call. Square offers both a hosted remote server with OAuth (recommended, no token management) and a local version you run with npx. Supports sandbox and production modes, plus a read-only flag if you want to prevent writes. Useful when you need to query sales data, manage product catalogs, process refunds, or automate Square operations without writing integration code yourself.