Shippo

Shippo is a multi-carrier shipping API, that allows anyone to retrieve shipping rates, shipping labels, track packages and much more. The API is developer-friendly, modern and robust, focussed on providing a reliable and powerful shipping backend for e-commerce stores and online marketplaces. The API allows creation of international shipments, customs declarations, commercial invoices, address validation and much more. Shippo supports many shipping providers, including USPS, FedEx, UPS, DHL, Canada Post, and many more. Additionally, Shippo offers discounted shipping rates for selected carriers.