The question I am going to answer is, what the lowest amount of US Dollars is, that you can possibly buy Bitcoin with. Rather, they have a page about trading minimums, where they say that you can only trade Bitcoins that are worth more than 0. Adrian Trummer April 21, Buy Bitcoin Worldwide does not promote, facilitate or engage in futures, options contracts or any other form of derivatives trading. Investing in bitcoin is no joke, and securing your investment should be your top priority.