APIs are the basis of the digital evolution, a revolution that has taken place thanks to the development of Information and Communication Technologies (ICT) which have led to heavy socio-economic changes and which has completely revolutionized the way to communicate. APIs are interfaces that allow access to data and / or functionality, more generally to digital assets. Modern applications are no longer independent and one-sided but versatile blocks capable of exploiting shared features, services, and data accessible through the APIs. In the Enterprise environment, the APIs, which were initially used only within the company itself to allow communication between the various technologies and platforms, have now become a business tool, exposing the APIs externally and making them accessible to the developer communities.