// nuget in Nancy and Nancy.Hosting.Self

void Main()
{
    using (var host = new Nancy.Hosting.Self.NancyHost(new Uri("http://localhost:8080"), new LinqpadNancyBootstrapper()))
    {
        host.Start();
        Console.ReadLine();
    }
}

public class HelloModule : Nancy.NancyModule
{
    public HelloModule() : base("api")
    {
        Get["/"] = parameters => "Hello World";
    }
}

public class LinqpadNancyBootstrapper : Nancy.DefaultNancyBootstrapper
{
    protected override void ConfigureApplicationContainer(Nancy.TinyIoc.TinyIoCContainer container)
    {
    }
}