ApiFrame is a simple .NET library that implements the core components required for ASP.NET WEB API development. It's a C# class library with logical separation of Server (Provider), Client (Consumer) and the supporting Framework (An Infrastructure). The Server components provide an interface to implement security (Authentication & Authorization), exception handling and versioning of Web API methods. The security mechanism implemented in this library is HMAC (Hash Message Authentication Code) authentication. One example of HMAC usage is Amazon web service (AWS) and the authentication process in this library uses a HMAC-SHA signature which is the same approach as AWS. The Client part provides a Gateway component that can be referenced by the .NET clients to consume the WEB API.