MiCA stablecoin reserve rules after Circle’s USDC compliance certification

Circle became the first global stablecoin issuer to achieve full compliance with the EU’s Markets in Crypto-Assets regulation by securing an Electronic Money Institution license from France’s ACPR. This authorization allows both USDC and EURC to operate as compliant e-money tokens within the bloc, a status that only three other stablecoins currently share: USDG, USDC, and EURC. The achievement was enabled by close collaboration between Circle France and regulatory teams over many months, resulting in a non-objection for their white paper submission. With the transitional period for existing providers ending on 1 July 2026, full authorization is now mandatory for any crypto-asset service provider operating in the EU. Firms that failed to secure this license can no longer serve the market, forcing a consolidation around compliant operators like Circle while unregulated alternatives face delisting from major exchanges.

Reserve composition and liquidity floors

The reserve framework for e-money tokens requires issuers to keep funds segregated from their own assets and fully backed at all times. Article 54 mandates that at least 30% of funds received must always be deposited in separate accounts at credit institutions, ensuring a baseline of immediate liquidity. For significant tokens, which meet specific thresholds such as having more than 10 million holders or a market capitalization above EUR 5 billion, this deposit floor rises to 60%. The remainder of the reserve may be invested in highly liquid financial instruments with minimal market and credit risk, including money-market funds and short-dated sovereign debt. The weighted average maturity of these instruments cannot exceed three months for non-significant tokens and one month for significant ones, preventing issuers from locking up capital in long-term assets.

Issuers must also maintain a daily liquidity floor set at 30% of average daily redemptions over the prior 12 months, computed on a 30-day rolling basis. This requirement ensures that even during periods of high redemption pressure, the issuer holds enough liquid assets to honor requests without selling investments at a loss. Custody arrangements are equally strict, requiring reserve assets to be held with a third-party custodian separate from the issuer’s balance sheet. For cash reserves, the custodian must be an EU-licensed credit institution, while investment-grade instruments require a CSDR-authorized central securities depository or a MiFID-licensed investment firm. These rules create a ring-fenced pool that is excluded from the insolvency estate, protecting token holders ahead of other creditors if the issuer fails.

Disclosure duties and ongoing supervision

Transparency obligations under Title IV impose a rigorous disclosure schedule that extends beyond initial licensing. Issuers must publish a white paper before any public offer and update it for material changes within 30 days. Reserve composition reports are required monthly for non-significant tokens but weekly for significant ones, providing regulators and investors with frequent visibility into asset allocation. An independent auditor must provide quarterly attestations confirming reserve adequacy and composition, alongside an annual audit of the issuer’s financial statements and custodian confirmations. Significant adverse events, such as a reserve mismatch or custodian default, must be reported to the home authority within 24 hours.

Circle’s USDC and EURC reserves are attested by Deloitte under quarterly engagements, with weekly issuer-prepared reports published alongside to demonstrate continuous compliance. The European Banking Authority designates tokens as "significant" based on quantitative criteria, including transaction volume and holder count, which triggers direct EBA supervision rather than national oversight. This supervisory transition raises capital requirements and tightens liquidity floors, ensuring that larger issuers carry more robust buffers. One open question remains whether the current concentration limits, which cap exposure to a single sovereign at 35%, will be revised in upcoming reviews to allow for more flexible reserve management.