Binary options are classed as exotic options, yet binaries are extremely simple to use and understand functionally. The most common binary option is a "high-low" option. Providing access to stocks, indices, commodities, foreign exchange or in our case "cryptocurrencies", a high-low binary option is also called a fixed-return option. This is because the option has an expiry date/time and also what is called a strike price. If a trader wagers correctly on the market's direction and the price at the time of expiry is on the correct side of the strike price, the trader is paid a fixed return regardless of how much the instrument moved. A trader who wagers incorrectly on the market's direction loses her/his investment.