Introduction. The active development of the international economy leads to the emergence of new financial instruments, which expands the capabilities of economic entities in carrying out efficient economic activities. However, cryptocurrency coins have become a relatively new, widely used financial instrument used by economic entities to increase the efficiency of payments and investments. The cryptocurrency market is growing rapidly and its capitalization is estimated at trillions of dollars. The main purpose of the article is to study the impact of cryptocurrencies on the international and national micro- and macroeconomics in the third decade of the XXI century. Methods. The theoretical and methodological basis of the article is the fundamental provisions of modern economics, the work of scientists. In the process of research, in particular, the following methods were used: analysis - to study the object and subject of research; abstract and logical (theoretical generalizations and formulation of conclusions on the impact of cryptocurrencies on national and international micro- and macroeconomics). Results. It has been established that cryptocurrency mining and trading has become an objective reality in the second decade of the XXI century, and at the beginning of the third decade already has a significant impact on the national and international economy, competing significantly with fiat money and, as far as possible, filling niches, filled fiat money. It has been proven that mining and trading of cryptocurrencies causes both positive and negative effects at both micro and macro levels, both in the international and national markets. It is noted that the circulation of cryptocurrencies is carried out mainly without legislative regulation (except for El Salvador, the United States and several other countries); however, self-regulation through the “invisible hand of the market” is quite effective. As long as there is no significant regulation of the cryptocurrency market, in our opinion, the cryptocurrency market will develop extremely actively, and its regulation by government agencies may hinder its development. Discussion. The obtained results can be used to expand knowledge about certain aspects of the impact of “mining” and circulation of cryptocurrencies on the activities of economic entities at the micro and macro levels. Keywords: mining, cryptocurrency, Monero cryptocurrency (XMR).
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