How do I send a rest object for a soap asmx?

I have this controller

[Route("api/[controller]")]
public class OptOutClientController : Controller
{
   HttpClient client = new HttpClient();
   private readonly IOptOutService _service;
   public OptOutClientController(IOptOutService service)
   {
        _service = service;
   }

   [HttpPost]
   public OptOutCliente Unsubscribe([FromBody]OptOutCliente cliente)
   {
       if (cliente == null)
          throw new OptOutException("Informar os dados do cliente OptOut!");

       var valida = _service.Process(cliente);

       BasicHttpBinding httpBinding = new BasicHttpBinding();
       EndpointAddress wsUrl = new 
           EndpointAddress("http://localhost:64460/myservicio.asmx");

       //ServicoWSClient soapClient = new ServicoWSClient(httpBinding, wsUrl);

        return cliente;
    }

}

the client parameter that comes from another service, I need to send it to another asmx service. How do I do this?