from davepermen.net i can now do this: http://localhost:7820/route/BlogModule and get back this [ "GET /", "GET /list/{pageId}", "GET /article/{id}", "GET /newArticle" ]

gistfile1.cs

public class RouteModule : NancyModule
    {
        public RouteModule(IRouteCacheProvider routeCache)
        {
            Get["/routes/all"] = _ => routeCache.GetCache().Select(entry => new
            {
                Module = entry.Key.Name,
                Routes = entry.Value.Select(route => route.Item2.Method + " " + route.Item2.Path)
            });
            Get["/route/{moduleName}"] = _ =>
                routeCache.GetCache()
                .Where(entry => entry.Key.Name == (string)_.moduleName)
                .Select(entry => entry.Value.Select(route => route.Item2.Method + " " + route.Item2.Path))
                .FirstOrDefault();
        }
    }