Many exchanges support the open market for digital currency, but I see that the inventor's API only supports the buy and sell function, and the video also says that the open market is only one direction, which is equivalent to only doing more.
The Little DreamDigital currency spot there is no concept of holding, you say holding is conceptual holding, spot is just buying and selling. Even if it is a leveraged account, it is also a buy and sell account, not a contract. You can send a link to all the open-end interfaces to see which transactions are the most popular.