docs: def is_valid_address(self, *args, **kwargs):
          """
          check address
  
          Accepts:
              - address [hex string] (withdrawal address in hex form)
              - coinid [string] (blockchain id (example: BTCTEST, LTCTEST))
          Returns dictionary with following fields:
              - bool [Bool]
          """
  
          client = HTTPClient(self.withdraw_server_address + self.withdraw_endpoint)
  
          return client.request('is_valid_address', kwargs)