NY-based start-up Keep is aiming to take a bite out of Pinterest by introducing OneCart, a universal shopping cart that works across different online stores. This new feature on the Keep shopping platform (web and mobile) is designed to work as a unified storefront enabled with one-click cross-platform check-out. Disappointedly, the function is not powered by an automated purchasing system, but instead relies on manual labors of its employers to finish the orders for their users one by one. While a universal check-out function definitely has its potential, as fewer payment hassle could facilitate more sales. But the way that OneCart is currently operating is not exactly sustainable if it grows in scale. Sooner or later, the company will need to figure out a better solution to offer the e-shoppers a seamless online retail experience.