How Stablecoin Reserves Are Audited

Stablecoin reserves are entering a regulated channel. Fidelity has launched a money market fund designed specifically for issuers operating under the GENIUS Act, joining State Street in targeting a market that currently holds roughly $320 billion in outstanding tokens across digital asset markets.

Reserve vehicles and permitted assets

The Fidelity Reserves Digital Fund will hold cash, short-term Treasuries, repurchase agreements, and government money market funds. The mandate limits investments to Treasury bills, notes, and bonds with maturities of 93 days or less, alongside cash balances and overnight repurchase agreements backed by U.S. Treasuries.

State Street launched a parallel vehicle this week — the State Street Stablecoin Reserves Money Market Fund — targeting the same permitted assets under the GENIUS Act. State Street Bank and Trust Company and Anchorage Digital joined as early backers. Two competing mandates now exist for compliant reserve management across traditional asset managers, custody providers, and digital asset firms.

Fidelity's fixed-income and money market infrastructure is now directly connected to stablecoin issuance through this fund. The firm previously extended into the digital dollar space with the Fidelity Digital Dollar (FIDD) earlier this year.

Regulatory framework and cross-jurisdictional response

The GENIUS Act established the first federal framework for payment stablecoins in the United States. Issuers must back tokens with cash, short-dated Treasuries, and certain government money market funds. Prior to this, reserve practices operated under state-level rules, private disclosures, and market norms.

Industry forecasts cited by State Street place future stablecoin issuance between $1.9 trillion and $4 trillion by 2030. That range defines the upper bound for institutional reserve demand and the addressable market for these funds.

A BIS report from the current cycle states that stablecoins fail four key tests for money and compares their structure to ETFs. The framing shifts the regulatory discussion from issuer solvency to monetary function.

Separately, the EU has introduced a revision to MiCA in direct response to the GENIUS framework, according to Cointribune reporting. Cross-jurisdictional alignment on permitted backing assets is now in motion.

Structural impact on reserves

Reserve management is migrating from issuer balance sheets to regulated money market vehicles. The transition introduces third-party attestation, standardized asset lists, and tighter liquidity profiles. For USDT specifically, the shift is relevant only to the extent that U.S.-domiciled competitors gain access to cheaper, federally compliant reserve products.

Items to track: Fidelity and State Street fund flows, any Tether attestation response to the new federal baseline, and the final text of the revised MiCA framework.