TransfersService transfersService = IntxServiceFactory.createTransfersService(client);
CreateCryptoAddressRequest request = new CreateCryptoAddressRequest.Builder()
    .portfolio("portfolio_id")
    .asset("ETH")
    .build();
CreateCryptoAddressResponse response = addressesService.createCryptoAddress(request);

For more information, please visit the INTX Java SDK.