We live in the era of changes brought by digitalization, its impact is only heightened by the current pandemic. In the new realities after the crisis, the world will continue expanding the digital interaction though its regulation is already lagging behind the current pace and needs of development. In view of the significant changes in social relations, the legal system must adequately ensure the conditions for the development and application of new technologies, while safeguarding the rights of citizens. In order not to violate the principle of legal certainty through the adoption of laws that are not effective or responsive to technical progress needs and demands, the legal order should provide suitable tools for the «crystallization» of sources of law. Experimental legal regime is one of such instruments. In the article, mechanisms of functioning and requirements for experimental legal regime have been examined in the context of the main type of regime, namely the «regulatory sandbox», in the light of inte