FoxyCart provides a hosted e-commerce platform built for integration into existing systems. Foxy.io's service is not turnkey or "all in one," but rather is built for Web professionals who already have their own best-of-breed systems. FoxyCart can serve as a foundation for advanced custom e-commerce deployments, or for quick and easy single-product online stores.
It's like a power drill compared to the turnkey, all-in-one "utility knife" approach taken by most systems. The latter is fine if you're installing a light switch, but if you're building a house you need the best tool for each specific job. Foxy.io is that tool, allowing easy, fully customized and integrated PCI compliant e-commerce to be added to your existing systems, be they CMSs, accounting, inventory, marketing, analytics, or beyond.