What is MiCA? The EU crypto rules explained

MiCA, the Markets in Crypto-Assets Regulation, is the European Union's law for crypto. It replaces separate national regimes with one rulebook for crypto companies and token issuers. It was adopted on May 31, 2023.

What does MiCA cover?

MiCA applies to crypto assets that were not already covered by EU financial law. It sorts them into three groups:

• E-money tokens, which are stablecoins tied to one official currency such as the euro or the dollar.
• Asset-referenced tokens, which are stablecoins tied to a basket of currencies or other assets.
• Other crypto assets, such as bitcoin and most altcoins.

Tokens that are already financial instruments, such as tokenized shares, stay under existing securities rules. Unique NFTs, and services that are fully decentralized with no company in the middle, are largely outside the law.

What are the rules?

Stablecoin issuers must be authorized, hold reserves, publish a disclosure document called a white paper and redeem tokens at face value. E-money tokens can be issued only by banks or licensed e-money institutions, and issuers may not pay interest on them.

Companies that run exchanges, hold customers' crypto or give advice are called crypto-asset service providers, or CASPs. A CASP must be authorized by a national regulator, keep client assets separate from its own, and meet capital, governance and conduct rules. One authorization is valid across the EU, an arrangement known as passporting. MiCA also bans insider trading and market manipulation in crypto.

When did it take effect?

1. June 2023. MiCA entered into force.
2. June 30, 2024. The stablecoin rules began to apply.
3. December 30, 2024. The rules for CASPs began to apply.
4. July 1, 2026. The transition period ended. Countries could let firms already operating under national law continue for up to 18 months, and some chose shorter periods.

Before that deadline, the European Securities and Markets Authority (ESMA) told providers without authorization to stop taking on EU clients and wind down. It advised customers to check a provider's status on its register.

What are the gaps, and what comes next?

Regulators themselves say the law has gaps. It says little about lending or staking services. It leaves open how far DeFi, or decentralized finance, falls outside the rules. And national regulators can classify the same token differently.

On September 30, 2026 ESMA published its response to the European Commission's review of the law. It asked for stricter rules on crypto marketing, including by influencers, disclosure rules for staking and lending, clearer criteria for decentralized services, and the power to issue binding opinions on how a token is classified. As of October 2026 the Commission has not proposed changes.

MiCA applies in the EU only. Rules differ by country, and in the US by state, and they change often, so check the national regulator or a qualified professional for a specific case.