Looking to transfer your money to the USA? Post Office Money's International Payments allows you to send as little as £50, quickly, easily and with no fees. Money USA get the money you need now with a great payday loan from us. We offer cash advances up to $ dollars with instant approval. The United States dollar is the official currency of the United States and its insular territories per the United States Constitution. It is divided into smaller cent (¢) units. The circulating paper money consists of Federal Reserve Notes that are Central bank : Federal Reserve System. Cohen, The Future of Money , Princeton University Press, , ISBN ; cf. What's on This Page American Money How to Authenticate U. A few countries use the Federal Reserve Notes for paper money, while still minting their own coins, or also accept U. Postal Supplies Parcel Size Guide Boxes - Small Parcel Boxes - All sizes Envelopes - Padded Envelopes - All Types Labels Gift Cards One4all Gift Card. The colloquialism " buck " s much like the British word " quid " s, pl for the pound sterling is often used to refer to dollars of various nations, including the U. It was designated by Section 9 of that Act as having "the value of a Spanish milled dollar ".