The European Securities and Markets Authority has issued guidelines for National Competent Authorities on supervisory practices to prevent and detect market abuse in crypto assets under the Markets in Crypto-Assets Regulation (MiCA). The guidance is intended to support consistent and efficient supervision across the EU and build a common supervisory culture for crypto-asset markets. Based on ESMA’s experience under the Market Abuse Regulation (MAR), the guidelines set general principles for risk-based and proportionate supervisory activity and outline practices tailored to crypto trading’s cross-border nature and intensive use of social media. They also set an objective for authorities to develop a common approach through open dialogue with industry and interactions with other NCAs. The guidelines will be translated into all EU official languages and will apply three months after the translated versions are published on ESMA’s website, with ESMA recommending that NCAs start implementing the principles in the meantime. Within two months of the multilingual publication date, competent authorities must notify ESMA whether they comply, do not comply but intend to comply, or do not comply and do not intend to comply.