BTCBOX is a Japanese cryptocurrency exchange, which is regulated by the Financial Services Agency (JFSA). This makes them a much more credible company than most of the competition. They provide access to Japanese customers to the world of crypto, as they even accept bank transfers. That being said, they may not be the ideal trading venue for a foreigner.
While this is a highly regulated exchange, the world of cryptocurrencies still carries a level of risk. If you are only looking to speculate with the price of Bitcoin, doing so with a forex broker may be preferable. View the link below for more details on the way regulation for forex brokers, offering Bitcoin works.