The Quiet Unbundling of ACH: How Stablecoin Settlement Is Reshaping Payments Without Replacing the Rails

 

 

The GENIUS Act and the May 19, 2026 executive order have moved the supervisory center of gravity for U.S. payments — and prudential regulators, not the CFPB, will lead the response.

By David Stickney, Founder & Managing Principal, Arq Advisory LLC

Published May 25, 2026

 

For four decades, the Automated Clearing House network has been the connective tissue of American consumer and commercial finance. Payroll, bill pay, account-to-account transfers, the bulk of recurring B2B settlement — all of it has run on an infrastructure designed in the 1970s and refined incrementally since. The market has been told that FedNow, launched in 2023, would be the next step in payment modernization. That framing is now obsolete.

Two developments have converged to make ACH a question rather than a fixture. The GENIUS Act, signed into law on July 18, 2025, established a federal regulatory framework legitimizing payment stablecoins as compliant instruments under prudential oversight. On May 19, 2026, President Trump signed an executive order titled “Integrating Financial Technology Innovation Into Regulatory Frameworks,” which directs federal financial regulators to review existing rules that constrain fintech participation in the banking system, and — critically — asks the Federal Reserve to evaluate whether non-bank fintechs and stablecoin-anchored institutions should have direct access to Federal Reserve payment accounts and settlement rails.

These are not parallel initiatives. They are sequenced policy actions that together create the conditions for a structural shift in U.S. payments. Some market datasets reported monthly stablecoin transfer volume surpassing ACH value in early 2026, with figures cited around $7.2 trillion in February. That headline deserves careful handling: raw on-chain stablecoin volume includes exchange flows, arbitrage legs, smart-contract activity, and other non-payment transfers that have no analog in ACH. Visa’s own on-chain methodology adjusts stablecoin volume meaningfully downward to remove these effects. The point is not that stablecoins have already overtaken ACH as a consumer or commercial payment rail. It is that stablecoin settlement is now operating at a scale that prudential regulators can no longer treat as adjacent to the banking system. The question for institutions is which regulators will own the supervisory response, what they will require of regulated institutions, and at what pace stablecoin settlement begins displacing specific ACH and wire use cases.

The answer to the first question requires precision. This is first a prudential story. The Federal Reserve, the Office of the Comptroller of the Currency, and the Federal Deposit Insurance Corporation will drive the supervisory framework that governs payment-account access, settlement finality, reserve management, capital treatment, and liquidity calibration. The Consumer Financial Protection Bureau, constrained in scope and currently operating under a posture of supervisory humility, will not be the agency reshaping how money moves between institutions. But the consumer-facing layer is a separate question. Any retail deployment — stablecoin wallets, payment apps, consumer disbursement products — remains squarely in CFPB and state-attorney-general territory, with live exposure under UDAAP, Regulation E error-resolution principles, disclosure regimes, complaint handling, and unauthorized-transfer doctrine. Institutions that conflate these two layers, or that assume the prudential primacy at the wholesale level extends to the retail edge, will be examined twice and prepared for one.

The Policy Architecture: GENIUS, the Executive Order, and What Comes Next

The GENIUS Act did something the digital asset industry had pursued for years: signed into law on July 18, 2025, it created a federal framework under which payment stablecoins could be issued, held, and used as regulated instruments. The act addressed reserve requirements, redemption rights, issuer licensing, and the prudential supervisory expectations that would govern stablecoin issuers operating in the U.S. market. It removed the threshold legal ambiguity that had kept institutional adoption tentative. The supervisory architecture, however, is still being constructed: implementing regulations from the FDIC and OCC are due by July 18, 2026, with effectiveness tied to publication of final rules or, at the latest, January 18, 2027. In other words, the statutory framework exists. The operational supervisory regime is being written now — which is the more consequential window for institutions that want to influence the standards under which they will be examined.

The act, however, did not by itself open the payment rails. A stablecoin issuer operating under GENIUS could be a compliant institution and still be functionally locked out of FedWire and the Federal Reserve’s settlement infrastructure, forced to route through correspondent banks like any other non-member institution. The May 19 executive order addresses precisely this gap. It directs every federal financial regulator other than the Federal Reserve Board to review existing regulations, guidance, supervisory practices, and application processes within 90 days, and to take steps within six months to remove unwarranted barriers to fintech participation. More consequentially, it asks the Federal Reserve to conduct the same review and to evaluate the legal, regulatory, and policy frameworks governing access to Reserve Bank payment accounts and services — what the industry refers to as master accounts.

This is the leverage point. Master-account or payment-account access is the difference between settling on the Federal Reserve’s books and settling through an intermediary. It determines whether a non-bank fintech or stablecoin issuer moves money through Fed rails directly, or remains a customer of the banks that do. The Federal Reserve’s May 20, 2026 proposal sketches the likely model: a limited payment account for eligible institutions, with constrained access to payment services and no intraday credit, no discount-window access, and no interest on balances. Direct access on those terms would move eligible non-bank firms closer to the settlement perimeter, but well short of full parity with insured depository institutions. The executive order also asks whether the twelve Federal Reserve banks can act independently of the Board of Governors to grant such access — a question that, if answered affirmatively, would meaningfully decentralize Fed gatekeeping over payment infrastructure.

Sequencing matters. GENIUS supplies the regulatory umbrella. The executive order operationalizes access. The third leg — institutional adoption — is already moving. Ripple is the clearest example: the firm filed a Ripple National Trust Bank charter application with the OCC tied to RLUSD reserve-management services, and reportedly filed for a Federal Reserve master account in July 2025. More broadly, market infrastructure firms and payment networks are piloting or integrating stablecoin settlement models — card-network settlement pilots, trust-charter applications, and blockchain-based cross-border payment infrastructure all visible in the public record. A new generation of fintechs, including stablecoin-native institutions building payment infrastructure on blockchain rails, is positioning to serve banks that need on-chain settlement without the volatility risk of native cryptocurrency tokens.

Put together, the architecture is straightforward. Stablecoins become regulated payment instruments. Stablecoin issuers and stablecoin-anchored fintechs gain constrained but direct access to Federal Reserve rails for the specific functions that access permits. Settlement, for the use cases where it matters, moves from a multi-day ACH cycle to seconds. The institutions that engage early help shape the operating model. The institutions that wait will be configuring their payments architecture around someone else’s settlement choices — with the cost structure, vendor dependency, and supervisory catch-up that implies.

Where Stablecoin Settlement Is Operationally Superior

The case for stablecoin-based settlement is not primarily ideological, and it is not universal. It is operational and use-case-specific. For cross-border B2B, treasury movement, intra-firm liquidity, card-network settlement, and programmable institutional transfers, the architectural case is strong. For domestic payroll, recurring consumer debits, government disbursements, and the bulk of established consumer bill-pay flows, ACH remains entrenched and operationally appropriate. The relevant comparison is not stablecoin versus ACH wholesale; it is stablecoin versus ACH for specific high-friction use cases. ACH, FedNow, and SWIFT all rest on a model in which value transfer is initiated by a message, reconciled through correspondent and central bank intermediaries, and settled on a delayed cycle. The user experience may feel instantaneous in retail contexts, but the underlying movement of value is comparatively slow, batch-oriented, and dependent on a network of bilateral relationships.

Stablecoin settlement collapses this architecture. A payment is initiated and finalized in a single on-chain transaction, typically in seconds. The Ondo Finance, JPMorgan, Mastercard, and Ripple cross-border Treasury redemption pilot completed settlement in under five seconds on the XRP Ledger. Stellar processes settlement in three to five seconds at fractional cent transaction costs. The implications for institutional operations are significant.

First, float economics tied to the multi-day ACH settlement cycle compress dramatically. The float income that supports parts of the correspondent banking model becomes harder to sustain when settlement is real-time. This is a strategic question for institutions whose revenue models depend on settlement timing.

Second, intraday liquidity management becomes simpler. The capital that banks currently hold to manage settlement risk — including reserves earmarked for settlement fails, return processing, and intraday liquidity peaks — can be deployed more efficiently when settlement finality is achieved on initiation rather than after a clearing window. The Fed has signaled in prior policy work that intraday liquidity is a meaningful supervisory concern, and faster settlement directly addresses it.

Third, ACH-style return mechanics are materially reduced — though not eliminated, and a different exception-management regime takes their place. ACH return codes, NOC processing, and the operational overhead of managing failed and reversed transactions are artifacts of a delayed settlement model. On-chain settlement is, at the transaction level, atomic and final: it either occurs or it does not. But that finality substitutes a new set of exception cases that institutions will need to manage: wallet compromise, mistaken transfers to wrong addresses, redemption failures at the stablecoin issuer, sanctions hits requiring on-chain remediation, smart-contract and custody failures, off-chain ledger mismatches, and the legal-recovery questions that arise when a final on-chain transfer turns out to have been the product of fraud or error. Operational risk teams spend less time on ACH-style exception processing and more time on a different exception surface — one that examiners will increasingly expect institutions to identify, scenario-test, and govern.

Fourth, on-chain records improve raw traceability, though the supervisory value of that traceability is not automatic. Every on-chain transaction is recorded on an immutable ledger visible to participants and regulators with the appropriate access. The data foundation is meaningfully stronger than what ACH and wire systems produce today — but only to the extent that institutions can attach reliable attribution to wallet addresses, integrate on-chain data with KYC/CIP/CDD systems, and account for the complications introduced by privacy-preserving technologies, cross-chain bridges, mixers, and foreign platforms. Done well, this is a step-change improvement in transaction monitoring, suspicious activity reporting, and pattern analysis. Done poorly, it is a larger volume of data without commensurate supervisory utility.

Fifth, cost structure improves materially. ACH and wire transactions carry fees and embedded operational costs. Stablecoin settlement, at scale, executes at fractions of a cent per transaction. Institutions that adopt stablecoin settlement for appropriate use cases — corporate disbursements, cross-border B2B, intra-bank movements — will operate at materially lower unit cost than those that do not.

None of this implies that ACH disappears overnight. It does imply that institutions running their payment operations exclusively on ACH and wire infrastructure are operating at a structural cost and speed disadvantage relative to peers integrating stablecoin settlement. The question for institutional leadership is whether to lead that transition, manage it, or be caught by it.

The Prudential Regulator Reckoning

Here the analysis must be precise, because the regulatory landscape on this issue is widely misunderstood. The instinct in compliance circles is to treat any major payments development as a CFPB matter. That instinct is wrong. The CFPB has jurisdiction over consumer financial protection — UDAAP, ECOA, RESPA, TILA, fair lending, debt collection, and adjacent areas. It does not have jurisdiction over the safety and soundness of payment infrastructure, the prudential standards governing settlement institutions, or the systemic risk implications of changes in how money moves through the banking system. These questions sit squarely with the Federal Reserve, the OCC, and the FDIC.

The CFPB will, of course, have a downstream interest. If stablecoin settlement reaches retail consumers at scale, questions of error resolution, disclosure, and Regulation E coverage will follow. The current Bureau, however, is operating under stated supervisory humility and is not the agency that will reshape institutional payment practices. The driving regulatory action is prudential.

Consider what the executive order actually directs. The Federal Reserve is asked to evaluate access to its payment accounts — a safety and soundness question. The OCC is reviewing whether national banks can participate in stablecoin issuance, custody, and settlement — a safety and soundness question. The FDIC is examining deposit insurance implications when stablecoin balances substitute for insured deposits — a safety and soundness question. None of this falls within the CFPB’s statutory mandate.

For institutions, this means the first-order supervisory response to stablecoin settlement will be framed in prudential terms. At the wholesale settlement layer, prudential examiners will be asking whether the institution has appropriately assessed and documented counterparty risk to stablecoin issuers, whether reserve adequacy and liquidity coverage have been recalibrated to account for on-chain settlement flows, whether operational resilience testing addresses the failure modes of blockchain-based settlement infrastructure, and whether the institution’s capital planning reflects the changed risk profile of its payment operations. UDAAP and consumer-compliance questions do not disappear — they remain live for any retail deployment, and the institutions that build stablecoin-enabled consumer products will face both layers of supervision. The point is that the gating supervisory questions, the ones that determine whether the institution is permitted to engage in this domain at all, are prudential.

This is the supervisory frame that will define winning and losing institutions. Capital adequacy, liquidity, operational resilience, third-party risk management, and model risk governance — these are the prudential disciplines that determine whether a bank is permitted to engage in stablecoin-based settlement and on what terms. Institutions that approach this as a consumer compliance question will be addressing the wrong examination.

Operational and Safety-and-Soundness Implications

The operational benefits of stablecoin settlement are real, but they come with new categories of risk that prudential regulators will expect institutions to identify, measure, and manage. The institutions that build that risk framework first will operate with regulatory confidence. Those that adopt without it will face supervisory friction, and in some cases, formal enforcement.

Counterparty risk to stablecoin issuers

This is the foundational concern. When an institution settles in a stablecoin, it is implicitly accepting exposure to the issuer’s reserve management, redemption mechanics, and operational integrity. GENIUS establishes baseline standards, but supervisory expectations will go further. Institutions will be expected to perform issuer-level due diligence comparable to what is required for any material third-party relationship, with ongoing monitoring of reserve composition, attestation quality, and operational track record. The OCC’s third-party risk management guidance provides the template; the application to stablecoin issuers is the new domain.

Operational resilience testing must be reframed

Traditional resilience scenarios assume failure modes within FedWire, ACH operator processes, or correspondent bank availability. On-chain settlement introduces new failure modes: stablecoin issuer insolvency or redemption suspension, blockchain network congestion or fork events, smart contract failure, oracle manipulation, and bridge or custody compromises. Each of these requires a documented scenario, a quantified impact, and a tested response. The Fed’s SR 20-24 and related operational resilience guidance will inform the supervisory expectations here, but institutions should not wait for that guidance to be written stablecoin-specifically.

Liquidity coverage and reserve management require recalibration

If stablecoin settlement comprises a meaningful share of an institution’s payment flows, liquidity requirements should reflect the speed and behavioral characteristics of on-chain settlement, not the legacy ACH and wire patterns. Stress scenarios should include rapid stablecoin redemption events, sudden settlement volume shifts between rails, and the operational liquidity demands of real-time finality. This is squarely Federal Reserve supervisory territory.

Settlement finality and capital treatment

This is a more technical but equally consequential question. Under what conditions does on-chain settlement constitute legal finality? How is exposure treated under regulatory capital rules during the brief window between transaction initiation and block confirmation? These questions will be answered by the prudential regulators, but institutions will need to participate in the analysis and document their positions defensibly.

Transaction monitoring and BSA/AML frameworks require redesign

Though through a prudential lens rather than only a compliance lens. The data foundation for on-chain settlement is richer than for ACH, but it is also fundamentally different. Pattern detection, suspicious activity identification, and OFAC screening must be re-engineered for blockchain-based settlement flows. The recent FinCEN alert on cross-border funds transfers involving illegal aliens, and the parallel executive order restricting financial services to non-work-authorized individuals, signal that the AML environment is intensifying at the same time that the technical settlement layer is changing. Institutions need to align both.

Model risk and data governance

This is an under-appreciated dimension. Many institutions will deploy AI-driven monitoring, reconciliation, and risk scoring against stablecoin settlement flows. Each of those models is subject to SR 11-7 expectations on model risk management. The volume and structure of on-chain data will tempt rapid model deployment; the supervisory standard for model validation and ongoing monitoring will not change to accommodate it.

The Examiner Perspective

Supervisory cycles do not wait for institutions to be ready. The prudential agencies have already begun building the analytical foundation for stablecoin settlement supervision, and the next examination cycle is the one in which those expectations begin appearing in MRA and MRIA findings, in CAMELS adjustments, and in formal supervisory action where institutions are materially exposed without commensurate controls.

From an examiner’s seat, a small set of questions will define the institution’s posture:

• Has the institution identified its current and prospective exposure to stablecoin-based settlement, including indirect exposure through correspondent and service-provider relationships?
• Has senior management adopted a documented strategy for participation in stablecoin settlement, including the risk appetite, governance structure, and limits framework that will govern it?
• Has the institution performed counterparty due diligence on each stablecoin issuer it interacts with, and is that due diligence current?
• Has operational resilience testing been updated to address stablecoin-specific failure modes?
• Are capital and liquidity frameworks calibrated to the institution’s actual and projected stablecoin settlement profile?

These questions are not speculative. They are the natural progression of how prudential examination addresses material changes in institutional operations, and they will be asked. Institutions that have answers — documented, board-approved, independently validated — will pass through examination cycles without supervisory friction. Institutions that do not will be brought into formal supervisory dialogue, which is a more expensive and slower path to the same destination.

The advantage of moving early is more than competitive. It is regulatory. Institutions that participate in the development of stablecoin settlement governance, that engage with their supervisory contacts on emerging practice, and that contribute to the comment processes on prudential guidance will help define the standards under which they will be examined. Institutions that wait will be examined against standards developed without their input.

The Institutional Decision Point

The convergence of GENIUS Act implementation, the May 19 executive order, the Federal Reserve’s mandated review of payment account access, and the documented scale of stablecoin transaction activity is not an isolated policy moment. It is the early operating phase of a structural change in U.S. payment infrastructure, sequenced and signaled in advance, with the prudential regulators positioned to define the supervisory framework that will govern institutional participation.

The question for institutional leadership is not whether to engage with this change. It is whether to engage proactively, on terms the institution can shape, or reactively, after a supervisory cycle has surfaced gaps that should have been addressed earlier. The institutions that build the prudential infrastructure first — counterparty risk frameworks for stablecoin issuers, operational resilience scenarios for on-chain settlement, capital and liquidity calibration for real-time finality, model risk governance for blockchain-derived data — will operate with the confidence that examination cycles will validate rather than challenge their position.

This is first a safety-and-soundness story, owned by the Federal Reserve, the OCC, and the FDIC at the wholesale settlement and prudential layer. It is also a consumer-compliance story at the retail deployment layer, where the CFPB, the FTC, state attorneys general, and state financial regulators will engage on UDAAP, disclosure, error resolution, complaint handling, and unauthorized-transfer doctrine. The institutions that understand which regulators own which layer — and that prepare for both rather than only the more visible one — will navigate the transition. The institutions that conflate the two, or that prepare for one regulator and are surprised by the other, will find themselves explaining to two agencies why they were prepared for neither.

ACH is not being dismantled. Nacha reported 35.2 billion ACH payments worth $93 trillion in 2025, up 4.9% in volume and 7.9% in value over the prior year — growth, not decline. What is happening is more interesting and more consequential: ACH is being unbundled. Stablecoin settlement is attacking specific high-friction use cases first — cross-border B2B, treasury movement, fintech-to-bank settlement, card-network settlement, programmable institutional transfers — while ACH continues to dominate the use cases where its characteristics still serve. The default architecture of American payments is no longer monolithic. It is being decomposed into rails, with the prudential supervisory framework governing which institutions can operate on which rails, under what conditions, with what controls. That framework is being written now. The institutions that engage with the prudential agencies during this window will help define the standards under which they will later be examined. The institutions that wait will be examined against standards developed without them.