NancyConsul.cs

 internal class Program
    {
        private static void Main(string[] args)
        {
            Cluster.Bootstrap(new NancyProvider(), new ConsulProvider(), "customers", "v1");

            Console.ReadLine();
        }
    }

    public class CustomerService : NancyModule
    {
        public CustomerService() : base("/customers")
        {
            Get["/"] = _ =>
            {
                var customer = new Customer
                {
                    CustomerId = 123,
                    CustomerName = "Acme Inc",
                };

                return Response.AsJson(customer);
            };
        }
    }