1) Whether the platform has serious slippage depends on the stability of the platform.
2) Whether the deposit and withdrawal are convenient and quick, and whether the exchange rate of deposit and withdrawal is consistent with the international exchange rate. What is investigated is the financial security of the platform.
3) Is the platform supervised by a large regulatory agency? The common ones are FCA license in Britain and NFC license in America.
4) Whether the non-operating funds are guaranteed by the company.
5) Is there a government endorsement (not very important, it is better to have it)