Hello, there are several industries according to which the cost of currencies in each exchanger is formed. Firstly, it is the economy. GDP, inflation rate, unemployment, trade balance, external debt and budget directly affect exchange rate fluctuations. Secondly, it is politics. If there are changes in the state concerning taxes, business conditions, benefits for the population, and there are international conflicts, this negatively affects the price of the national currency. If you need to exchange bitcoin, it is better to use the services of online exchangers.