US Treasury unveils detailed stablecoin rules

TLDR

The US Treasury has published its first detailed rulebook for stablecoins under the GENIUS Act, moving stablecoin oversight into a formal federal rulemaking phase.

1. Treasury issued a Notice of Proposed Rulemaking that sets strict standards for payment stablecoins, including 1:1 reserves, fast redemptions, disclosures, and AML compliance.
2. The framework creates a dual system where sub 10 billion dollar issuers can stay under strict state regimes, while larger issuers face direct federal oversight and bank style safeguards.
3. These rules are still proposed, with a 60 day comment period and likely 9 to 18 months before enforcement, and open questions around yield bearing stablecoins and DeFi integrations.

Deep Dive

1. What The New Rules Actually Do

Treasurys 87 page Notice of Proposed Rulemaking under the GENIUS Act sets out detailed requirements for dollar pegged payment stablecoins, including full 100 percent reserve backing in high quality liquid assets like Treasuries and central bank deposits, segregation of reserves with qualified custodians, and redemption at par within 48 hours for holders and merchants. One proposal bans rehypothecation so issuers cannot reuse the same reserves for multiple obligations, and mandates regular, audited disclosures on reserves and operations with strict Bank Secrecy Act and sanctions compliance and consumer disclosures on risks such as lack of deposit insurance. The rule also defines when state regimes are substantially similar to federal standards, creating a federal floor for reserve quality, reporting, and supervisory powers while allowing some state level tailoring in areas like capital standards and enforcement, as explained in the Treasury focused summaries on GENIUS implementation and the associated public consultation launch.

2. Impact On Stablecoins And Crypto Users

Issuers with less than 10 billion dollars in outstanding stablecoins can remain under state oversight only if their regimes meet or exceed federal protections, while issuers above that threshold must move to federal supervision, with the Office of the Comptroller of the Currency expected to be the primary regulator for large players. This targets systemically important issuers such as US dollar stablecoins that already hold more than 150 billion dollars of Treasuries and process tens of trillions of dollars in annual volume, and is likely to push smaller, lightly regulated issuers either to upgrade their compliance or exit. Unresolved questions remain for interest bearing stablecoins that share yield with holders, which are central to the separate CLARITY market structure bill and a key point of tension between crypto firms that want higher yielding digital dollars and banks that fear deposit outflows, as highlighted in recent policy coverage.

3. Timeline, Open Issues, And Risks To Watch

The NPRM opens a 60 day public comment window; after that Treasury and other agencies can revise and finalize rules, with analysts estimating 9 to 18 months before enforcement deadlines begin to apply. Implementation will depend on how agencies like the Federal Reserve, OCC, FDIC, and state regulators coordinate on supervision, and how tightly they define safe reserve assets and substantially similar state regimes. There is also a live debate around using technology such as smart contract based controls to enforce anti money laundering rules on stablecoins and around how far these rules will reach into offshore issuers and DeFi protocols that integrate stablecoins, both flagged in recent speeches by Federal Reserve officials and in coverage of the GENIUS Acts rollout.

Conclusion

US Treasurys detailed GENIUS Act rules move stablecoins from policy debate into concrete regulation, with strict reserve, disclosure, and AML standards tied to issuer size and jurisdiction. For crypto users and builders, the likely outcome is a smaller set of heavily regulated payment stablecoins that look more like financial infrastructure, while yield sharing designs, loosely supervised issuers, and some DeFi use cases face more scrutiny and potential redesign as the rulemaking process plays out.