The EasyPost .NET SDK by EasyPost communicates with the API to access shipping data. With the kit that provides installation and usage, developers can integrate USPS, UPS, and FedEx services into applications. Examples demonstrate how to verify an address and purchase a label for a shipment.
Printful, a drop shipping service for custom print products and a product of the same team who created Startup Vitamins and BeHappy.me, has provided the Printful API that will allow people to easily integrate the functionality with their websites and applications. The service is specifically aimed at small and medium websites that want to offer print products, but don't want to handle the fulfillment and shipping of those products.