gistfile1.cs

    public class MyApiExplorer : ApiExplorer
    {
        public MyApiExplorer(HttpConfiguration config)
            : base(config)
        {
        }
        public override bool ShouldExploreController(string controllerVariableValue, System.Web.Http.Controllers.HttpControllerDescriptor controllerDescriptor, System.Web.Http.Routing.IHttpRoute route)
        {
            if (skip) // your logic to filter out API by route
            {
                return false;
            }

            return base.ShouldExploreController(controllerVariableValue, controllerDescriptor, route);
        }
    }

    /// <summary>
    /// Use this class to customize the Help Page.
    /// For example you can set a custom <see cref="System.Web.Http.Description.IDocumentationProvider"/> to supply the documentation
    /// or you can provide the samples for the requests/responses.
    /// </summary>
    public static class HelpPageConfig
    {
        public static void Register(HttpConfiguration config)
        {
            // Register your custom ApiExplorer
            config.Services.Replace(typeof(IApiExplorer), new MyApiExplorer(config));

            //// Uncomment the following to use the documentation from XML documentation file.
            //config.SetDocumentationProvider(new XmlDocumentationProvider(HttpContext.Current.Server.MapPath("~/App_Data/XmlDocument.xml")));

            //// Uncomment the following to use "sample string" as the sample for all actions that have string as the body parameter or return type.
            //// Also, the string arrays will be used for IEnumerable<string>. The sample objects will be serialized into different media type 
            //// formats by the available formatters.
            //config.SetSampleObjects(new Dictionary<Type, object>
            //{
            //    {typeof(string), "sample string"},
            //    {typeof(IEnumerable<string>), new string[]{"sample 1", "sample 2"}}
            //});

            //// Uncomment the following to use "[0]=foo&[1]=bar" directly as the sample for all actions that support form URL encoded format
            //// and have IEnumerable<string> as the body parameter or return type.
            //config.SetSampleForType("[0]=foo&[1]=bar", new MediaTypeHeaderValue("application/x-www-form-urlencoded"), typeof(IEnumerable<string>));

            //// Uncomment the following to use "1234" directly as the request sample for media type "text/plain" on the controller named "Values" 
            //// and action named "Put".
            //config.SetSampleRequest("1234", new MediaTypeHeaderValue("text/plain"), "Values", "Put");

            //// Uncomment the following to use the image on "../images/aspNetHome.png" directly as the response sample for media type "image/png"
            //// on the controller named "Values" and action named "Get" with parameter "id".
            //config.SetSampleResponse(new ImageSample("../images/aspNetHome.png"), new MediaTypeHeaderValue("image/png"), "Values", "Get", "id");

            //// Uncomment the following to correct the sample request when the action expects an HttpRequestMessage with ObjectContent<string>.
            //// The sample will be generated as if the controller named "Values" and action named "Get" were having string as the body parameter.
            //config.SetActualRequestType(typeof(string), "Values", "Get");

            //// Uncomment the following to correct the sample response when the action returns an HttpResponseMessage with ObjectContent<string>.
            //// The sample will be generated as if the controller named "Values" and action named "Post" were returning a string.
            //config.SetActualResponseType(typeof(string), "Values", "Post");
        }
    }