The drf-json-api is a parser and renderer for the Django REST framework. It also adds support for the JSON API specification, but it doesn't provide any of the additional functionality one might normally find in a JSON API.
Who needs a tracking service when you can just hop on the USPS, FedEx, UPS, or DHL website (or whoever your carrier is) and just track? Maybe you. The Trackthis API integrates an amazing array of functions into your application. The API webpage lists over 10 carriers you can get notifications for.