As far as I know, the online banking system of Hebei Bank can buy foreign exchange. As a formal commercial bank, Hebei Bank can provide foreign exchange trading services for individuals and corporate customers, including foreign exchange trading through its online banking platform. Please note, however, that before conducting foreign exchange transactions, you may need to meet some conditions, such as opening foreign exchange trading functions, providing identification and conducting KYC (Know Your Customer) procedures. In addition, foreign exchange transactions may be restricted by some laws, regulations and regulatory requirements. For more detailed information, please refer to the relevant regulations of Hebei Bank or contact its customer service.