APIs - Technology
The crossTank and crossTerm APIs use the Open Data Protocol (OData). OData is a standardized protocol for creating and consuming data APIs. OData builds on core protocols like HTTP and commonly accepted methodologies like REST. The result is a uniform way to expose full-featured data APIs.
How you develop an application which uses the crossTank or crossTerm API via OData depends on the framework and programming language used to for creating applications. The OData community consists of a collection of libraries and each of them have their own download and documentation websites.