Is it legal to trade currency?

Could you please clarify what you mean by "currency" in the context of your question? Are you referring to traditional fiat currencies such as the US dollar, euro, or yen, or are you inquiring about the legality of trading in cryptocurrencies, such as Bitcoin or Ethereum? The legality of trading currencies can vary significantly depending on the jurisdiction and the specific type of currency being traded. In general, the trading of traditional fiat currencies is typically legal and regulated by government agencies in most countries. However, there may be restrictions or regulations in place related to anti-money laundering, capital controls, or other financial regulations. On the other hand, the legal status of cryptocurrencies varies widely across different countries and regions. Some countries have embraced the technology and have created a regulatory framework for cryptocurrencies, while others have imposed strict restrictions or outright bans. It's important to research the specific laws and regulations in your jurisdiction before engaging in any cryptocurrency trading activity. So, to summarize, the legality of trading currency depends on the type of currency being traded and the jurisdiction in which the trading is taking place. If you could provide more specific information about your situation, I may be able to offer a more detailed answer.