code: public static void main(final String... args) throws IOException {
      checkArgument(args.length > 0, SYNTAX);
      setupLogging();
  
      String portOverride = System.getenv("DENOMINATORD_PORT");
      int port = portOverride != null ? Integer.parseInt(portOverride) : 8080;
      Provider provider = Providers.getByName(args[0]);
      log.info("proxying " + provider);
      Object credentials = credentialsFromArgs(args);
  
      DNSApiManager mgr = Denominator.create(provider, credentials, new JavaLogger());
      new DenominatorD(mgr).start(port);
    }
docs: Presents a {@link DenominatorDApi REST api} to users, by default listening on port 8080.