PetroDollar (using token ticker XPD) is the only crypto project of its kind: the currency that its team created is tied in a direct way to the price of a gallon of oil measured in the United States dollars. The issue recognized by the PetroDollar team is the following: there is an enormous financial potential still left in the oil business and the oil international trade. That market is left almost entirely inaccessible to millions upon millions of people who simply don’t possess the means to do so. Creating a blockchain-based project that ties cryptocurrency to the real world relation of oil and fiat currency, they are in effect making a guarantee to their investors that the dynamic change in price of the tokens they are buying would reflect the world oil market. That allows people who might not have the means to invest in the oil market right now to still benefit from the market growing, helping more people to make money on investments. The token itself, PetroDollar, is counted at about a one to ten thousand relationship to the barrels of oil still left in the ground at the present moment. The token is minable, and the miners are rewarded in XPD token.