Lummis pushes Treasury for clearer state stablecoin rules under GENIUS Act

Senator Cynthia Lummis is leading a bipartisan push for the Treasury Department to issue explicit written guidance on how states can certify their stablecoin oversight frameworks as equivalent to federal standards under the GENIUS Act. The request, detailed in a letter to Treasury Secretary Scott Bessent, targets a critical gap in the implementation of the landmark stablecoin legislation passed last year. Lummis and her colleagues argue that the Treasury's April 2026 proposed rulemaking on stablecoin regulation lacks a clear, transparent process for state regulators to demonstrate compliance. Without such guidance, state-chartered stablecoin issuers face regulatory limbo, potentially ceding market share to federally chartered competitors. The senators are demanding procedural guardrails: specific timelines, documentation requirements, and evaluation criteria to prevent state regulators from being sidelined in the new federal regime. This matters now because the Treasury's final rule, expected by late 2026, will determine whether the U.S. stablecoin market consolidates around a handful of federally supervised issuers or preserves the dual-track state-federal system that has driven innovation in digital asset markets.

The GENIUS Act's Undefined Certification Bottleneck

The GENIUS Act, signed into law in 2025, established a federal framework for stablecoin issuance while preserving a role for state regulators, provided their oversight regimes meet federal standards. The Treasury's April 2026 proposed rule, however, left the certification process largely undefined. The rule text references state equivalence determinations but provides no procedural roadmap for states to apply, no timeline for Treasury review, and no criteria for evaluating state regulatory programs. This ambiguity creates a de facto bottleneck: state regulators cannot certify their frameworks, and state-chartered issuers cannot plan compliance strategies. Lummis's letter specifically requests that Treasury publish a written guidance document that includes a formal application process, defined review periods, and an appeals mechanism for states whose certification is denied. The letter also asks for a public comment period on the certification framework itself, signaling that the senators view the current rulemaking as procedurally incomplete. For state regulators in New York, Wyoming, and other states with existing stablecoin regimes, the absence of clear rules risks rendering their oversight efforts moot. The Treasury's response will determine whether the GENIUS Act creates a genuinely dual-track system or a de facto federal monopoly. The letter argues that without a defined application process, state regulators cannot prepare the documentation needed to demonstrate equivalence, leaving their oversight regimes in limbo indefinitely.

How Certification Ambiguity Distorts Issuer Economics

The certification ambiguity directly impacts the economics of stablecoin issuance. State-chartered issuers, including those operating under the New York BitLicense or Wyoming's special-purpose depository charter, face higher regulatory uncertainty costs than federally chartered competitors. This cost differential manifests in three ways: legal fees to navigate undefined certification processes, capital allocation decisions delayed by regulatory risk, and potential market share loss to federally chartered issuers that can operate with regulatory clarity. The market for U.S. dollar stablecoins, currently exceeding $200 billion in total supply, generates substantial revenue for issuers through reserve yield and transaction fees. Issuers that cannot secure state certification by the Treasury's compliance deadline risk being forced to convert to federal charters, surrender their state licenses, or exit the market entirely. This dynamic concentrates market power among a small number of federally chartered institutions, reducing competition and potentially increasing spreads for end users. The Treasury's certification guidance will effectively determine the distribution of billions of dollars in annual stablecoin revenue between state and federally chartered entities. Lummis's intervention aims to preserve the competitive pressure that state-chartered issuers exert on the market, preventing the emergence of a regulatory moat that protects incumbents. The letter specifically notes that state-chartered issuers have driven innovation in reserve management and redemption mechanisms, and that losing those players would reduce market efficiency.

Competitive Reshuffle Among Issuer Types

The certification process will redraw the competitive landscape of U.S. stablecoin issuance. Federally chartered banks and trust companies, entities like Paxos, Circle, and the banking arms of major financial institutions, stand to benefit most from a restrictive or unclear state certification process. These firms already operate under federal oversight and face no certification uncertainty. State-chartered issuers, including smaller fintechs and regional banks, face the opposite dynamic: they must either navigate the undefined state certification process or seek federal charters, which carry higher compliance costs and operational requirements. The winners in this reshuffle are the federally chartered incumbents that can absorb the cost of regulatory compliance and scale their operations across multiple states. The losers are state-chartered innovators that lack the balance sheet to support a federal charter application or the legal resources to litigate certification denials. Lummis's letter implicitly recognizes this dynamic, arguing that a clear state certification process preserves the competitive diversity that has characterized U.S. financial regulation since the dual-banking system was established. Without such clarity, the stablecoin market will consolidate around a small number of federally chartered issuers, reducing the innovation and price competition that state-chartered entities provide. The letter points to Wyoming's special-purpose depository charter as an example of state-level innovation that a clear certification process would protect.

Downstream Effects on Infrastructure and Enterprise Adoption

The certification uncertainty ripples through the broader stablecoin infrastructure. Custodians, wallet providers, and payment processors must build compliance systems that accommodate both state and federal regulatory regimes, but the undefined certification process forces them to design for multiple scenarios. This uncertainty delays enterprise adoption: corporate treasurers evaluating stablecoins for payments or treasury management require regulatory certainty before committing to specific issuers or infrastructure providers. The Treasury's April rule also affects the development of stablecoin-based payment rails, as network operators must ensure their systems can accommodate issuers under both state and federal oversight.

The stakes extend beyond stablecoin issuance. Research firm Benchmark, writing in The Block, called the SEC's concurrent proposal to rescind National Market System Rules 611 and 610(e) the most consequential U.S. crypto regulatory action of 2026, arguing that market structure changes at the trading layer will interact directly with stablecoin settlement infrastructure. Taken together, the Treasury's stablecoin certification ambiguity and the SEC's NMS overhaul represent two simultaneous regulatory gaps that enterprise buyers must navigate simultaneously. For Fortune 500 treasuries, payment processors, and remittance companies, the optimal outcome is a clear, predictable certification process that allows them to evaluate state-chartered and federally chartered issuers on equal footing. Lummis's push for procedural clarity directly addresses this enterprise demand for regulatory predictability, which drives adoption decisions in corporate finance departments. The letter notes that enterprise adoption of stablecoins for cross-border payments and treasury management has accelerated in 2026, making regulatory clarity more urgent than at any prior point in the GENIUS Act's implementation.

Policy Signal on Federal vs. State Regulatory Balance

The Lummis letter represents a broader policy signal about the balance of power between federal and state regulators in the digital asset space. The GENIUS Act was designed as a compromise between federal preemption and state regulatory autonomy, but the Treasury's implementation threatens to undermine that compromise. The letter's bipartisan nature is notable: Lummis is a Republican from Wyoming, a state that has aggressively pursued digital asset regulation through its special-purpose depository charter and digital asset exemptions, while her Democratic co-signatories represent states with their own established frameworks. That coalition underscores that the state certification issue transcends partisan divides and reflects a shared congressional interest in preserving the legislative intent of the GENIUS Act against the risk of executive-branch drift during implementation.

The Treasury's response will signal whether the administration views state regulators as genuine partners in stablecoin oversight or as procedural obstacles to be managed. A clear, transparent certification process would affirm the dual-track approach that the GENIUS Act's drafters intended. A vague or restrictive process would effectively federalize stablecoin regulation without further congressional action, raising significant separation-of-powers questions that Lummis and her colleagues signal they are fully prepared to pursue. This decision carries implications beyond stablecoins: it will set a precedent for how federal agencies implement forthcoming digital asset legislation, including potential market structure bills for crypto trading and custody. The Treasury's answer to Lummis's request will be read by state regulators, issuers, and market participants as a defining statement about the future of U.S. financial federalism in the digital asset era.

The Treasury's response to Lummis's letter will arrive against a backdrop of accelerating stablecoin adoption and intensifying international competition. The European Union's Markets in Crypto-Assets Regulation (MiCA) already provides a clear licensing framework for stablecoin issuers, and jurisdictions like Singapore and the UAE are actively competing to attract digital asset businesses with regulatory clarity and predictable timelines. If the Treasury fails to provide a transparent state certification process, the U.S. risks losing stablecoin innovation to jurisdictions that resolved the federal-state regulatory question earlier and more cleanly, eroding the first-mover advantage U.S. dollar-backed stablecoins have built as the dominant global settlement instrument. For Treasury Secretary Scott Bessent, the Lummis letter arrives as a direct legislative signal from the Act's own architects: the senators who built the GENIUS Act's dual-track system are now watching whether the executive branch is prepared to honor it. Lummis's bipartisan coalition carries meaningful weight on Treasury rulemaking timelines, particularly when implementation deviates from congressional intent. The final rule, expected in the fourth quarter of 2026, will either preserve the competitive diversity that has made the U.S. stablecoin market the world's largest by dollar volume, or consolidate issuance power in a small group of federally chartered institutions that effectively ends state-level experimentation in stablecoin regulation. Lummis's intervention ensures that the question of state regulatory autonomy remains central to that rulemaking, and signals that Congress is prepared to legislate further if Treasury's implementation hollows out the dual-track framework the GENIUS Act was specifically designed to protect.