This thesis is devoted to the analysis, design and implementation of the web application and the web API, which allows people to bid or demand to personally exchange a certain amount of money from one currency to another. Based on an analysis of similar web services, application requirements are defined. Based on the analysis and requirements, a user interface has been designed. The thesis is also devoted to application design from the implementation point of view and subsequently implemented in Django framework in the Python programming language. Finally, the application was tested with users.