I have a Problem with a dependency injection.

In the first step I'm injecting Services to retrieve Data from a third-party-API into my Umbraco-Controllers. This works fine.

Now I have a custom dashboard which saves the API-Urls and I'm trying to inject a service to get these URLs into the other Services. This doesn't work. And I'm stuck.

A Service will look something like this:

namespace My.Namespace.Interfaces.Services
{
    public interface ISomeModelService : IDisposable
    {
        List<SomeModel> GetSomeModel(string parameter); 
    }
}

namespace My.Namespace.Umbraco.Shared.Services
{
    public class SomeModelService : ISomeModelService
    {
        public void Dispose()
        {
        }
        public List<SomeModel> GetVertragskonten(string parameter)
        {  
        }
    }
}

My Global Asax:

namespace Namespace
{
    public class Global : UmbracoApplication
    { 
        protected override void OnApplicationStarted(object sender, EventArgs e)
        {
            base.OnApplicationStarted(sender, e);
            var configuration = GlobalConfiguration.Configuration;
            var builder = new ContainerBuilder();
            builder.RegisterInstance(ApplicationContext.Current).AsSelf();
            //register all controllers found in this assembly
            builder.RegisterControllers(Assembly.GetExecutingAssembly());
            var assemblies = AppDomain.CurrentDomain.GetAssemblies().Where(a => a.FullName.StartsWith("My.Namespace."));
            foreach (var a in assemblies)
            {
                builder.RegisterControllers(a);
                builder.RegisterApiControllers(a);
            }

            builder.RegisterApiControllers(typeof(UmbracoContext).Assembly);
            builder.RegisterType<SomeModelService>().As<ISomeModelService>();

            var container = builder.Build();

            //setup the webapi dependency resolver to use autofac
            configuration.DependencyResolver = new AutofacWebApiDependencyResolver(container);
            //setup the mvc dependency resolver to user autofac
            DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
        }
    }
}

Some Umbraco Controller

namespace Namespace.Controllers
{
    public class SomeController : SurfaceController
    {
        private ISomeModelService someModelService;

        public KontoController(ISomeModelService s)
        {
            this.someModelService = s;
        }
    }
}

How would I inject a Service that can retrieve Data from Umbraco into the other Service. I have problems with ciruclar build dependency. Thanks for your help.