Stablecoin Reserve Requirements: Attestations, Custody, and Liquidity Management

By Chanté Eliaszadeh | Updated June 2026

The GENIUS Act will move stablecoin reserves from a “best practices” aspiration toward a strict legal mandate — but that transformation is still arriving, not yet complete. The Act was enacted on July 18, 2025, and it sets specific requirements for reserve composition, monthly third-party examinations, qualified custody, and redemption mechanics. What it does not yet do is bind: the statute is not yet effective, and its implementing rules remain in proposed form as of mid-2026. For issuers, that gap between “enacted” and “effective” is the single most important fact to get right.

For issuers planning new stablecoins or restructuring existing ones, understanding both the forthcoming requirements and the current state of practice is critical. This guide breaks down the reserve framework the Act will impose once effective, explains the timeline, distinguishes what issuers do today from what the statute will demand, compares reserve models, and provides actionable frameworks for building compliant reserve infrastructure. I traced how the U.S. approach to stablecoin regulation evolved from early agency guidance toward this legislative framework in the U.S. chapter of Global Legal Insights: Blockchain & Cryptocurrency Regulation, co-authored with White & Case partner Doug Landy.

Throughout, statutory citations are to the GENIUS Act, Pub. L. 119-27, 139 Stat. 419 (July 18, 2025), codified at 12 U.S.C. § 5901 et seq. The reserve, attestation, custody, and redemption requirements all live in Section 4 (12 U.S.C. § 5903), with key definitions in Section 2.¹

Enacted, Not Yet Effective: The Timeline That Governs Everything

Before any of the substantive requirements below matters operationally, an issuer has to know when they bite. The GENIUS Act is law, but it is not yet operative.

Effective date. The Act becomes effective on the earlier of (a) January 18, 2027 — eighteen months after the July 18, 2025 enactment — or (b) 120 days after the final implementing regulations issue. Whichever comes first sets the operative date.²

The rules are proposed, not final. As of mid-2026, the implementing rulemaking is still in the proposal stage. Law-firm trackers describe an OCC notice of proposed rulemaking (published in the Federal Register on or about March 2, 2026), a Treasury notice of proposed rulemaking governing when a state regime is “substantially similar” to the federal one, and an FDIC notice of proposed rulemaking (published on or about April 10, 2026). The statutory rulemaking deadline is approximately July 18, 2026, and a three-year transition period runs for non-compliant digital-asset service providers — to roughly July 2028.³

Because the Federal Register pages cannot be fetched programmatically, the effective-date and rulemaking specifics in this section rest on high-reliability secondary trackers (law-firm analyses) rather than on a confirmed read of the primary source. Treat them as well-sourced but provisional, and confirm each against the final rules and the published Federal Register notices before relying on a date.

What this means for issuers. Read every “the Act requires” in this guide as “the Act will require, once effective.” The substantive rules below are worth building toward now — the lead time on custody arrangements, attestation engagements, and reserve-monitoring technology is measured in quarters — but an issuer is not in breach of a statute that has not yet taken effect, and the details may shift when the rules are finalized. Build to the statute, watch the rulemaking, and confirm the final form before treating any requirement as locked.

The 1:1 Reserve Mandate

Once effective, the GENIUS Act will require payment stablecoin issuers to maintain reserves backing outstanding payment stablecoins on at least a one-to-one basis.⁴ For every stablecoin in circulation, the issuer must hold at least one dollar of permitted reserve assets, segregated from operating funds and held with qualified custodians.

The statute defines a “payment stablecoin” as a digital asset the issuer is obligated to redeem for a fixed monetary value (Sec. 2(22)) — a definition that does substantial work, because it is the source of the redemption-at-fixed-value obligation discussed below. The 1:1 mandate forecloses fractional-reserve models, algorithmic stabilization without full backing, and dynamic collateralization that dips below 100%.

What “At Least” Means in Practice

Because the statute requires “at least” 1:1 backing, many issuers maintain reserves exceeding 100% to provide liquidity buffers during redemption surges. Over-collateralization is permitted, and many compliance teams favor 102–105% reserve ratios to accommodate:

• Redemption request processing delays
• Asset valuation fluctuations (even for low-risk Treasuries)
• Transaction timing gaps between redemption requests and asset liquidation
• Examination comfort (examiners prefer safety margins)

Industry practice: Leading issuers such as Circle (USDC) maintain reserves greater than or equal to outstanding stablecoins, with monthly attestations confirming the position.⁵ This conservative approach signals financial soundness and builds market confidence.

Permitted Reserve Assets

The GENIUS Act restricts reserves to a closed list of high-quality, liquid assets designed to minimize credit risk and ensure rapid conversion to cash for redemptions (Sec. 4(a)(1)(A)(i)–(viii)).⁶ The structure matters: this is a permitted list, not a list of prohibitions. Any asset not enumerated is simply not a permitted reserve asset — the statute does not separately catalog “banned” assets.

Permitted Assets Under the Statute

1. Currency and Central Bank Reserves

• U.S. dollar coins and currency
• Federal Reserve notes
• Balances held at Federal Reserve Banks

Why permitted: Zero credit risk, instantly available for redemptions, no market-value fluctuation.

Illustrative allocation: 5–15% of reserves for immediate redemption capacity.

2. Insured Depository Institution Deposits

• Demand deposits at FDIC-insured banks
• Deposits at federally insured credit unions
• Deposits withdrawable on request without penalty or restriction

Why permitted: Federal deposit insurance up to applicable limits, minimal credit risk from regulated institutions, high liquidity.

Illustrative allocation: 10–25% of reserves.

Custody note: The standard FDIC insurance limit is $250,000 per depositor, per insured bank, per ownership category. That limit is real, but it should not be overstated. It does not mean a large issuer’s bank deposits are protected only to $250,000 in total; depending on account structure, pass-through deposit insurance and the use of multiple insured institutions can extend coverage, and the bulk of a well-run reserve sits in Treasuries and government money market funds rather than uninsured bank balances in the first place. Diversifying banking relationships is prudent for concentration reasons — the SVB episode below is the cautionary tale — but the $250,000 figure is not a cap on the issuer’s total protection.

3. Short-Term U.S. Treasury Securities

• Treasury bills, notes, or bonds with a remaining maturity of 93 days or less
• Direct obligations of the U.S. government

Why permitted: Full faith and credit of the U.S. government, a highly liquid secondary market, and minimal interest-rate risk given the short duration.

Illustrative allocation: 60–80% of reserves for larger issuers seeking yield while maintaining safety.

Market liquidity: U.S. Treasuries trade in the deepest, most liquid government securities market in the world. Even large stablecoin issuers can liquidate positions rapidly without material market impact.

4. Treasury-Backed Repurchase and Reverse-Repurchase Agreements

• Repurchase and reverse-repurchase agreements collateralized by U.S. Treasuries
• Typically overnight; cleared through approved central counterparties or otherwise subject to the standards the rules will set

Why permitted: Short maturity supports daily liquidity, Treasury collateral provides security, and central clearing reduces counterparty risk.

Illustrative allocation: 5–15% of reserves, primarily for overnight cash management.

5. Government Money Market Funds

• SEC-registered government money market funds (Investment Company Act Rule 2a-7)
• Funds invested in permitted reserve assets (Treasuries, repos, cash)

Why permitted: Professional reserve management, diversification, SEC oversight, and institutional-grade custody and accounting.

Illustrative allocation: 40–70% of reserves for issuers leveraging professional fund management.

Leading option: The Circle Reserve Fund (ticker USDXX), an SEC-registered government money market fund managed by BlackRock, was created specifically for stablecoin reserve management and holds the majority of USDC reserves.⁷

Tokenized forms. The permitted-asset list reaches tokenized forms of the assets above, anticipating on-chain representations of cash and Treasuries — subject to whatever conditions the implementing rules attach.

What Is Not a Permitted Reserve Asset

Because the list is closed, anything outside it is, by definition, not a permitted reserve asset. The practical takeaway is the same as a prohibition list, but the statutory mechanism is exclusion, not enumeration. Assets that fall outside the permitted list include:

• Corporate securities — corporate bonds (even AAA-rated), commercial paper, corporate equity, asset-backed securities
• Municipal obligations — state and local government bonds, municipal notes, tax-exempt securities
• Crypto and digital assets — Bitcoin, Ether, other cryptocurrencies, other stablecoins
• Longer-duration Treasuries — Treasury securities maturing in more than 93 days, Treasury STRIPS, TIPS
• Real assets — real estate, commodities (gold, silver, oil), physical assets of any kind
• Derivatives — interest-rate swaps, options, futures, credit default swaps

The rationale: Limiting reserves to the safest, most liquid assets prevents the credit risk, maturity mismatches, and illiquidity that drove historical stablecoin failures. Tether’s reserve composition (discussed below), which includes gold, Bitcoin, and secured lending, illustrates the point — those holdings would fall outside the permitted list, so Tether’s current composition is non-conforming for a GENIUS-permitted payment stablecoin.

Reserve Asset Comparison Table

The allocation percentages in this and the following tables are illustrative practitioner estimates, not quotes or statutory figures. Real allocations depend on an issuer’s scale, structure, and provider, and on the final implementing rules.

Strategic allocation: Most sophisticated issuers use a tiered-liquidity approach — an immediate tier (cash and Fed deposits for same-day redemptions), a same-day tier (T-bills and government MMFs), and a yield-optimization tier (slightly longer-dated but still ≤93-day T-bills).

Custody and Segregation Requirements

The GENIUS Act protects reserves directly through a prohibition on rehypothecation and by giving stablecoin holders a senior claim to the reserves in an issuer insolvency.⁸ Segregation from operating funds, the categories of eligible custodian, and the applicable capital and custody standards are left to the implementing rulemaking (Sec. 4(a)(4)).

What the Statute Requires Directly

Two reserve-protection points are statutory and should be treated as firm:

• Prohibition on rehypothecation. Reserve assets may not be pledged, rehypothecated, or reused, with a narrow exception for creating short-term liquidity to meet redemptions through repurchase agreements on Treasuries maturing in 93 days or less (Sec. 4(a)(2)).
• Holder-claim seniority. The statute establishes the priority of stablecoin holders’ claims to the reserves in an issuer insolvency, giving holders seniority with respect to the reserve assets (Sec. 4(a)(7)(B)).

These two protections — the bar on rehypothecation and holder-claim seniority — are the backbone of the bankruptcy-remote design, and they are in the statute today. Segregation and non-commingling, long standard custodial practice, fall within the custody standards the implementing rules will specify (Sec. 4(a)(4)).

Anticipated Custody Standards (To Be Set by Rulemaking)

The categories of eligible custodian, capital requirements, and detailed custody controls are not specified in the statute; they are to be set by the implementing rules (Sec. 4(a)(4)). The list below is drawn from analogous custody regimes and current institutional practice — it describes what issuers should anticipate, not what the GENIUS Act mandates by its terms. Confirm the actual standards against the final rules.

Custodians that issuers commonly use, and that comparable regimes treat as qualified, include:

• Federally chartered banks and federal savings associations (OCC-supervised)
• State-chartered depository institutions and trust companies with banking-regulator oversight
• SEC-registered broker-dealers subject to the Customer Protection Rule (Rule 15c3-3)
• CFTC-registered futures commission merchants with segregated-account authority
• Registered investment advisers offering qualified custody under Investment Advisers Act Rule 206(4)-2

The common thread across these regimes — ongoing federal or state supervision, examination, capital requirements, and consumer-protection standards — is the right lens for evaluating a custodian now, and is the lens the rulemaking is likely to adopt. Unregulated crypto custody providers, foreign custodians without U.S. oversight, and self-custody by the issuer sit outside that lens.

Segregation and Bankruptcy-Remote Structuring

Building on the statutory anti-rehypothecation rule (Sec. 4(a)(2)) and holder seniority (Sec. 4(a)(7)(B)), issuers structure reserve accounts to make those protections operational — and to deliver, by account titling and contract, the segregation the rulemaking will formalize:

1. Separate accounts titled for the benefit of stablecoin holders, not the issuer’s general accounts
2. Clear recordkeeping identifying which assets back which stablecoins
3. No commingling of reserve assets with the custodian’s proprietary assets
4. Holder priority so that, in issuer insolvency, holders’ claims to the reserves are senior

Account titling. Most issuers use titling language along these lines:

“[Custodian Bank], as Custodian for [Stablecoin Issuer], for the benefit of [Stablecoin Name] holders”

This establishes beneficial ownership separate from both issuer and custodian.

Multi-custodian approach. Many large issuers use multiple qualified custodians to reduce concentration risk, broaden insured-deposit coverage, provide redundancy, and satisfy institutional-investor diversification expectations.

Example: Circle holds USDC reserves with The Bank of New York Mellon, a leading global custodian, which provides institutional-grade custody, segregated account structures, and integration with Circle’s transparency reporting.⁹

Rehypothecation Restrictions

The GENIUS Act bars issuers from pledging, rehypothecating, or reusing reserve assets, with a narrow exception for creating liquidity to meet redemption expectations (Sec. 4(a)(2)).¹⁰

Permitted liquidity exception. Issuers may use reserve Treasuries to generate cash for redemptions through short-dated repos against those ≤93-day Treasuries, provided the purpose is meeting redemption requests rather than generating yield.

Prohibited rehypothecation includes lending reserve assets for fee income, using reserves as collateral for the issuer’s own corporate borrowing, securities-lending programs, and any revenue-generating reuse unrelated to redemption liquidity.

Rationale. Preventing rehypothecation keeps reserves available for redemptions at all times, avoiding the maturity mismatches that drive bank runs.

Monthly Examinations, Today’s Attestations, and the Annual Audit

This is the area where the gap between current practice and the GENIUS Act’s forthcoming requirements is widest — and where a common but consequential error appears. The three concepts below are genuinely different levels of accountant involvement, and conflating them misstates both what issuers do today and what the statute will demand.¹¹

Three Distinct Levels of Assurance

• Agreed-upon procedures (AUP) — no assurance. In an AUP engagement, the accountant performs specific procedures the issuer and accountant agree on and reports the factual results, but expresses no opinion and no assurance. This is what issuers such as Circle and Tether generally publish today. An AUP report is useful transparency, but it is not an attestation of reserve adequacy in the assurance sense.
• Examination engagement (AT-C Section 205) — reasonable assurance. An examination is a higher-order engagement in which the accountant expresses an opinion providing reasonable assurance about the subject matter. This is what the GENIUS Act will require monthly.
• Audit — the financial-statement audit. A GAAP financial-statement audit under PCAOB standards is broader still, covering the issuer’s financial condition rather than reserves alone. The GENIUS Act will require this annually for the largest issuers.

The AICPA’s “Criteria for Stablecoin Reporting: Specific to Asset-Backed Fiat-Pegged Tokens” (2025, with Part II controls criteria added in January 2026) provides a standardized framework that supports examination engagements for stablecoin reserves.¹² Importantly, the existence of that standard does not mean issuers are performing examinations today — the standard enables examination-level work, while current published reports are generally AUP. The GENIUS Act’s monthly-examination requirement is therefore a real step up from prevailing practice.

What the GENIUS Act Will Require

Monthly examination by a registered public accounting firm. Once effective, the Act will require a monthly examination of reserve reports by a registered public accounting firm, with certifications by the issuer’s chief executive officer and chief financial officer (Sec. 4(a)(3)(A)–(C)). A knowing false certification carries criminal exposure under 18 U.S.C. § 1350(c).

Monthly public disclosure. The Act will require monthly public disclosure of reserve composition — total stablecoins outstanding, the composition of reserves, the average tenor of reserve holdings, and the custody location (Sec. 4(a)(1)(C)).

Annual audited financials for the largest issuers. Issuers with more than $50,000,000,000 in outstanding stablecoins will additionally be required to publish annual audited financial statements prepared under PCAOB standards (Sec. 4(a)(10)(A)).

CEO/CFO Certification

Each monthly examination will be accompanied by CEO and CFO certifications addressing the accuracy of the report and the issuer’s compliance with the reserve requirements. The personal certification, backed by the Section 1350(c) penalty for a knowing false certification, creates individual accountability at the top of the issuer.

What Examination Reports Will Include

A monthly examination report keyed to the statutory disclosure points (Sec. 4(a)(1)(C)) will typically present:

• Reserve composition — the percentage in each permitted asset class, the weighted-average maturity of Treasury holdings, and custody location
• Quantitative metrics — total stablecoins outstanding (verified on-chain), total reserve value (marked to market), and the reserve ratio
• Custody verification — confirmation that assets are held with qualified custodians in segregated structures with no commingling

Example: Circle publishes monthly USDC reserve reports prepared by Deloitte showing reserve composition, with the majority held in the Circle Reserve Fund (USDXX) and the remainder in cash at regulated banks.¹³ As with other issuers, evaluate the engagement type (AUP versus examination) on the face of each published report rather than assuming.

Compliance Cost: An Illustrative Picture

The figures in this section and the cost summary near the end of this guide are illustrative practitioner estimates, not quotes. Actual costs depend on an issuer’s scale, structure, provider, and the final rules. Get current quotes for your own situation rather than relying on these ranges.

Monthly engagement costs vary with issuance volume, reserve complexity, and the firm engaged; they rise with multi-custodian, multi-asset structures, with the depth of blockchain verification, and with multi-jurisdictional operations. Systemically important issuers (more than $50 billion outstanding) will also bear the cost of an annual PCAOB audit on top of the monthly engagement. The headline takeaway is directional: a meaningful reserve-compliance program is a six- to seven-figure annual undertaking at scale, and the right number for any given issuer comes from a current quote, not a published range.

Choosing an Engagement Provider

Big Four firms bring regulatory credibility, institutional-investor comfort, global reach, and deep resources for complex structures, at higher cost and with slower onboarding. Specialist firms with dedicated digital-asset practices bring crypto-native expertise, lower cost, and faster turnaround, but less name recognition with traditional institutional investors and smaller teams. The practical pattern: smaller issuers often start with specialist firms, mid-market issuers move to national firms with digital-asset groups, and the largest issuers gravitate to the Big Four — both for investor expectations and because the annual PCAOB audit for $50B+ issuers sits naturally with a large firm.

Redemption Mechanisms and Liquidity Management

Reserve adequacy means little if holders cannot redeem quickly. The GENIUS Act requires issuers to establish clear redemption procedures and to disclose fees in plain language (Sec. 4(a)(1)(B)), and the “payment stablecoin” definition (Sec. 2(22)) supplies the substance of the redemption obligation.¹⁴

What the Statute Says About Redemption

It is worth being precise here, because the redemption obligation is easy to overstate. The Act does two related things:

• It defines the obligation. A “payment stablecoin” is one the issuer is obligated to redeem for a fixed monetary value (Sec. 2(22)). That definitional obligation — redemption for a fixed value — is the substance of what holders are often shorthand-told as “redeem at par.” It is more accurate to say the statute defines the instrument as one carrying a fixed-value redemption obligation than to say the statute contains an express, standalone “redeem at par” command.
• It requires procedures and fee disclosure. The Act requires issuers to establish and publish clear redemption procedures and to disclose redemption fees in plain language, with fee changes permitted only on at least seven days’ advance notice (Sec. 4(a)(1)(B)).

Mandatory disclosures. In practice, a compliant redemption policy will address how to submit requests (web portal, API), verification requirements (KYC/AML), processing timing, and fee disclosure — with any fee change subject to the seven-day notice rule.

Industry practice: Leading issuers process redemptions within one to two business days, charge zero or minimal fees, and honor the fixed-value redemption obligation regardless of market conditions.

Direct Redemption vs. Secondary Market Trading

The statute does not, on its face, require every holder to have direct redemption rights against the issuer, which leaves room for two models: universal direct redemption (all holders redeem with the issuer, requiring robust KYC/AML for retail) and authorized-participant redemption (only institutional participants redeem directly; retail holders use the secondary market, with arbitrage maintaining the peg). How the implementing rules treat authorized-participant structures is not yet settled; a conservative approach offers direct redemption to all holders above a modest minimum.

Liquidity Management During Runs

Prudent reserve management includes regular stress testing across redemption-surge scenarios (for example, 10%, 25%, and 50% of supply redeemed over one to three days), backed by liquidity buffers and the permitted redemption-liquidity repo capacity.

To meet stress scenarios without forced asset sales, issuers maintain a layered liquidity stack — immediately available cash and Fed deposits, same-day-liquid T-bills and government MMFs, and pre-negotiated repo capacity allowing short-dated borrowing against reserve Treasuries to fund redemptions and unwind as pressure subsides. The repo exception (Sec. 4(a)(2)) is the statutory tool that makes this possible while keeping the Treasuries in reserves.

Holder-claim seniority, not redemption stays. The reserve and insolvency core of the Act protects holders through the bar on rehypothecation (Sec. 4(a)(2)) and the seniority of holder claims to the reserves (Sec. 4(a)(7)(B)). It does not, in that core, vest bankruptcy courts or the Federal Reserve with a power to impose stays or restrictions on stablecoin redemptions; this guide does not assert any such redemption-stay or emergency-restriction power. The operative protection for holders is the priority of their claim to segregated reserves.

Operational reality. Well-managed issuers prevent runs through transparent reporting, over-collateralization, diversified liquidity sources, and clear communication during market stress.

Reserve Models: 100% Backing vs. Over-Collateralization

The statute mandates a minimum of 1:1 backing, leaving issuers a strategic choice between minimum compliance and conservative over-collateralization.

100% Reserve Model

Exactly 1:1 backing maximizes capital efficiency and simplifies reserve management, but it leaves zero margin for error — any valuation decline or operational gap risks a compliance breach — and offers minimal liquidity buffer during redemption surges. It suits sophisticated issuers with advanced treasury systems, smaller issuers for whom excess reserves are capital-intensive, and issuers with predictable redemption patterns.

Over-Collateralization Models

Over-collateralization absorbs timing gaps, protects against minor valuation fluctuations, reassures examiners, and signals financial strength — at the cost of the capital tied up and the opportunity cost of the excess reserves. Most leading issuers maintain 102–105% ratios; Circle, for example, reports reserves greater than or equal to USDC outstanding.¹⁵

A Note on Yield

Whatever the reserve composition, the GENIUS Act prohibits an issuer from paying interest or yield to stablecoin holders (Sec. 4(a)(11)). An issuer may earn yield on reserve Treasuries and money market funds, but it may not pass that yield through to holders. This is a structural feature of the regime that shapes both product design and the economics of running a stablecoin.

Comparing Leading Stablecoins’ Reserve Approaches

The three largest dollar stablecoins illustrate the range of compliance readiness. The figures below should be confirmed against each issuer’s current transparency reporting, which changes frequently.¹⁶

USDC (Circle)

• Reserve ratio: Greater than or equal to 100%, disclosed monthly
• Composition: Roughly 80% Treasuries held through the Circle Reserve Fund (USDXX), a BlackRock-managed government money market fund, with the remainder (roughly 20%) in cash at globally systemically important banks
• Custody: The Bank of New York Mellon
• Engagement: Monthly reports by Deloitte
• Transparency: Frequent reserve-holdings disclosure plus monthly reports
• Issuer development: Circle completed its initial public offering in June 2025 (NYSE: CRCL, priced at $31 per share), a notable step in the issuer’s institutionalization
• Readiness: Closest to GENIUS-conforming composition among the three

USDT (Tether)

• Reserve ratio: Reported to exceed liabilities
• Composition (qualitative): A large majority in direct and indirect U.S. Treasuries, with corporate-bond exposure reduced to a negligible amount, plus material, separately reported holdings of gold and Bitcoin and a book of secured loans. Tether’s 2025 reporting shows Treasuries well above 80% of reserves, corporate bonds reduced to a trivial line item, and gold and Bitcoin each as distinct, material positions. (Confirm the current figures against tether.io/transparency before relying on them.)
• Engagement: Quarterly attestations by BDO (less frequent than USDC’s monthly cadence)
• Conformance gap: Gold, Bitcoin, and secured loans are not among the GENIUS Act’s permitted reserve assets (Sec. 4(a)(1)(A)). Tether’s current composition is therefore non-conforming for a GENIUS-permitted payment stablecoin, and Tether would need to restructure its reserves to register as a federal payment stablecoin issuer

PYUSD (Paxos / PayPal)

• Issuer: PYUSD is issued by Paxos Trust Company, not by PayPal directly; PayPal is the brand and distribution partner¹⁷
• Composition (directional): Cash and U.S. Treasuries; treat any precise breakdown as something to confirm against Paxos’s transparency reporting rather than as a fixed figure
• Readiness: Directionally aligned with the permitted-asset list, leveraging Paxos’s regulated trust infrastructure

Key takeaway: USDC’s composition is closest to GENIUS-conforming, with monthly reporting and institutional custody. Tether would require significant reserve restructuring to conform. PYUSD, issued through a regulated trust company, is directionally aligned. As always, verify against each issuer’s current reporting.

The SVB Lesson: Why Reserve-Bank Concentration Matters

The clearest real-world illustration of why the permitted-asset list and custody diversification matter is the March 2023 USDC depeg.¹⁸

In early March 2023, Circle disclosed that roughly $3.3 billion of USDC’s cash reserves — about 8% of total reserves — were held at Silicon Valley Bank when the bank failed. The concentration of uninsured cash at a single bank, suddenly in question, was enough to shake confidence: USDC briefly lost its $1 peg, trading as low as roughly $0.87 to $0.88. After federal regulators announced a backstop making SVB depositors whole, USDC regained its $1 peg within about three days.

The episode is the canonical lesson on reserve-bank concentration, and it runs directly through this guide’s structural choices. It is why the permitted-asset list leans so heavily on Treasuries and government money market funds rather than bank deposits; why custody diversification across multiple institutions is prudent; and why the $250,000 FDIC figure, while real, is not the whole story — the deeper protection comes from holding the bulk of reserves in instruments outside any single bank’s balance sheet. A GENIUS-conforming reserve, dominated by ≤93-day Treasuries and government MMFs with bank deposits held as a managed minority across diversified relationships, is a direct structural answer to the SVB failure mode.

Building a Compliant Reserve Management Framework

For issuers planning new stablecoins or restructuring existing ones, building compliant reserve management is a systematic, multi-quarter effort — and because the rules are not yet final, it is best done as a build-toward-the-statute program with checkpoints against the rulemaking.

Phase 1: Infrastructure Design

Select qualified custodian(s). Evaluate candidates on regulatory supervision, segregated-account capability, integration with the accounting firm performing the monthly engagement, fees, asset coverage, and institutional strength. Anticipate the custody standards the rulemaking will set, and use the supervision lens described above. A common structure pairs a Tier 1 bank custodian with a backup custodian for redundancy.

Structure reserve accounts. Work with custody counsel to establish beneficial ownership for holders, segregation from operating funds, the bankruptcy-remote protections grounded in Sec. 4(a)(2) and Sec. 4(a)(7)(B), and clear redemption mechanics. Large issuers often split reserves across primary, secondary, and banking-deposit custody.

Select the reserve asset mix. Based on liquidity stress testing, capital-efficiency goals, and yield targets, set a target allocation built only from permitted assets — for example, a government MMF core, a ≤93-day T-bill sleeve, cash at FDIC-insured banks for instant redemptions, and a small overnight-repo allocation, totaling 100% backing with an optional buffer to reach 102%.

Phase 2: Technology Integration

Implement a real-time reserve-monitoring system that combines on-chain verification of outstanding stablecoins with custody-account balances, computes the reserve ratio continuously, alerts on threshold breaches, and supports rebalancing. Integrate the relevant blockchain nodes (and independent analytics such as Chainalysis, Elliptic, or TRM Labs) to verify outstanding supply, and grant the accounting firm read-only access and automated data feeds to support the monthly engagement.

Phase 3: Operational Procedures

Stand up daily reserve management (morning balance verification and ratio calculation, midday redemption processing and rebalancing, end-of-day reconciliation and snapshot archiving) and a monthly engagement cycle (month-end snapshot freeze, accounting-firm procedures, CEO/CFO certification, and public disclosure). Tier redemption procedures by size, with enhanced verification and treasury pre-positioning for large and jumbo redemptions.

Phase 4: Compliance Monitoring

Run an internal-audit program over reserve-ratio compliance, custody segregation, redemption processing, and technology controls; maintain a complete audit trail for examinations; and conduct periodic stress tests, updating liquidity buffers and repo capacity as results warrant. Assign a team member to track the rulemaking so the program updates when the final rules issue.

State-Level Reserve Requirements

The GENIUS Act sets a federal baseline and a federal/state allocation, but state requirements remain relevant — both for issuers under the state threshold and as a model some states adopted ahead of the federal regime.

The $10 Billion State/Federal Threshold

The Act allocates oversight by size. A state regulatory regime is available where an issuer’s consolidated issuance is $10,000,000,000 or less (Sec. 4(c)(1)), provided the state regime is certified “substantially similar” to the federal one (the subject of the pending Treasury rulemaking). An issuer that grows past $10 billion must transition to federal oversight within 360 days (Sec. 4(d)). Federal nonbank issuers register with and are supervised by the OCC (Sec. 4(b)), and the statute defines a “Federal qualified issuer” (Sec. 2(11)). This threshold is central to the regime’s design: it lets smaller issuers operate under a (substantially-similar) state regime while routing systemically larger issuers to federal supervision.

New York DFS Requirements

New York’s Department of Financial Services established stablecoin reserve requirements in June 2022 guidance, predating the federal legislation.¹⁹ The NYDFS framework requires reserves in U.S. Treasury bills (with a maturity limit of three months), reverse repos collateralized by Treasuries, government money market funds, and deposits at U.S.-chartered banks — similar in spirit to the GENIUS Act but expressed as a three-month maturity limit rather than the statute’s 93-day measure. NYDFS also requires DFS-approved custodians, monthly examination by an independent U.S.-licensed CPA under AICPA standards, public reporting within 30 days, and redemption at par within two business days. Because the NYDFS regime is closely aligned with the federal framework, NY-chartered issuers are comparatively well-positioned for GENIUS compliance.

State Money-Transmitter “Permissible Investments”

Most states with money-transmitter licensing require licensees to hold “permissible investments” equal to outstanding payment obligations, and an issuer operating as a money transmitter must satisfy both the GENIUS Act and applicable state-level investment rules. State permissible-investment lists vary — some permit a broader range of instruments (including, in some states, investment-grade corporate debt) than the GENIUS Act allows. Hawaii effectively requires dollar-equivalent reserves for crypto held, aligning with 100% backing; Texas permits a broader investment range that the more restrictive GENIUS standard would override for a payment stablecoin; and California’s Digital Financial Assets Law imposes custody and reserve requirements on digital-asset licensees, with specifics set by regulation.²⁰ The compliance strategy is to design to the most restrictive applicable standard — generally the GENIUS Act — so a single reserve composition satisfies federal and state requirements at once.

Reserve Management Best Practices

Drawing on leading issuers’ approaches and the structure of the forthcoming federal regime:

• Maintain a 102–105% reserve ratio. Even a small buffer materially reduces compliance risk and reassures examiners.
• Prioritize liquidity over yield. Keep a substantial share in same-day-liquid assets (cash, government MMFs, overnight repos).
• Use institutional-grade custody. Favor custodians with strong regulatory standing, robust technology, and an institutional track record.
• Automate reserve monitoring. Real-time ratio visibility and automated alerts reduce operational risk.
• Engage your accounting firm early and stay with it; switching providers later creates continuity questions.
• Document everything — every reserve transaction, allocation decision, and custodian selection — for examination.
• Stress test regularly and update liquidity buffers and repo capacity on the results.
• Communicate transparently, publishing monthly reports prominently and considering more frequent reserve disclosures.
• Prepare for redemption volatility with pre-negotiated repo lines and custodian relationships supporting rapid liquidation.
• Monitor the rulemaking. The implementing rules are not yet final; assign someone to track them and update the program when they issue.

Cost Summary: Building Compliant Reserve Infrastructure

The figures below are illustrative practitioner estimates, not quotes. Real one-time and ongoing costs depend on an issuer’s scale, structure, provider, and the final rules. Build a budget from current quotes for your own situation rather than relying on these ranges.

For a large issuer, one-time implementation spans custody setup and legal structuring, reserve-monitoring and blockchain-verification technology, initial setup of the monthly engagement, and internal compliance infrastructure. Ongoing annual costs span the monthly engagements, custody fees (a few basis points on reserves), technology-platform licenses, internal compliance staff, and reserve transaction costs. Directionally, a mature reserve-compliance program runs on the order of low single-digit tenths of a percent of outstanding stablecoins annually — but the operative number for any issuer comes from current, situation-specific quotes. Note that while an issuer can earn yield on reserves (T-bill and MMF returns) to offset these costs, the GENIUS Act prohibits passing that yield through to holders (Sec. 4(a)(11)).

Conclusion: Reserve Management as Competitive Advantage

The GENIUS Act will move stablecoins from experimental crypto assets toward regulated financial instruments with institutional-grade transparency and safety — once it takes effect and the rules are final. For issuers, the compliance program is expensive and operationally complex, but it is also a durable competitive moat.

Issuers that build robust reserve management, transparent monthly reporting, and institutional custody will earn trust from institutional investors, payment processors, regulators, and retail users alike. The reserve framework is not merely regulatory overhead — it is the foundation for stablecoins’ evolution into essential financial infrastructure. Build it to the statute now, watch the rulemaking, confirm against the final rules, and the issuers who excel at reserve management will be the ones who lead the regulated market.

Need Stablecoin Reserve Compliance Guidance?

Astraea Counsel helps stablecoin issuers design compliant reserve frameworks, select qualified custodians, implement attestation and examination processes, and navigate federal and state requirements. Explore our Digital Assets & Blockchain legal services.

Related Resources

• The GENIUS Act: Your Stablecoin Compliance Roadmap — Federal registration strategy
• Qualified Crypto Custodians: Regulatory Requirements and Selection Guide — Choosing custodians for reserve assets
• Treasury Management for Crypto Companies — Corporate treasury and liquidity strategies
• Money Transmitter Licensing: State-by-State Strategy — State licensing coordination

---

Footnotes

1. Guiding and Establishing National Innovation for U.S. Stablecoins Act (GENIUS Act), Pub. L. No. 119-27, 139 Stat. 419 (July 18, 2025) (codified at 12 U.S.C. § 5901 et seq.). Reserve, attestation, custody, and redemption requirements are codified at 12 U.S.C. § 5903 (Section 4 of the Act). Bill text: S. 1582, 119th Cong. (2025), https://www.congress.gov/bill/119th-congress/senate-bill/1582. ↩

2. GENIUS Act effective date — the earlier of January 18, 2027 (18 months after enactment) or 120 days after issuance of the final implementing regulations. Drawn from law-firm analyses of the Act as of mid-2026; confirm against the final rules and the statute’s effective-date provision. ↩

3. Implementing-rulemaking status as of mid-2026 — OCC notice of proposed rulemaking (Fed. Reg., on or about Mar. 2, 2026); Treasury “substantially similar” state-regime notice of proposed rulemaking; FDIC notice of proposed rulemaking (Fed. Reg., on or about Apr. 10, 2026); statutory rulemaking deadline on or about July 18, 2026; three-year transition for non-compliant digital-asset service providers (to approximately July 2028). These specifics rest on high-reliability secondary trackers (law-firm analyses) because the Federal Register pages could not be fetched programmatically; confirm each against the final rules and the published Federal Register notices. ↩

4. GENIUS Act, 12 U.S.C. § 5903, Sec. 4(a)(1)(A) (1:1 reserve backing). The “payment stablecoin” definition appears at Sec. 2(22). ↩

5. Circle, “USDC Transparency and Trust,” https://www.circle.com/transparency (last visited June 2026). ↩

6. GENIUS Act, 12 U.S.C. § 5903, Sec. 4(a)(1)(A)(i)–(viii) (permitted reserve assets, including the 93-day Treasury maturity limit, Treasury repos and reverse repos, government money market funds, and tokenized forms). ↩

7. Circle Reserve Fund (ticker USDXX), an SEC-registered government money market fund managed by BlackRock. See BlackRock fund information for the Circle Reserve Fund and Circle, “USDC Reserve,” https://www.circle.com/usdc (last visited June 2026). ↩

8. GENIUS Act, 12 U.S.C. § 5903, Sec. 4(a)(2) (prohibition on pledging, rehypothecating, or reusing reserve assets) and Sec. 4(a)(7)(B) (priority of holder claims to the reserves in insolvency). Detailed custody and capital standards — including reserve segregation and diversification — are reserved to rulemaking under Sec. 4(a)(4). ↩

9. Circle, “USDC Reserve Composition,” https://www.circle.com/transparency (last visited June 2026). ↩

10. GENIUS Act, 12 U.S.C. § 5903, Sec. 4(a)(2) (reserves may not be pledged, rehypothecated, or reused, except to create liquidity to meet redemption expectations through repos of ≤93-day Treasuries). ↩

11. The AUP / examination / audit distinction reflects AICPA attestation standards generally; the GENIUS Act’s monthly-examination and annual-audit requirements appear at 12 U.S.C. § 5903, Sec. 4(a)(3)(A)–(C) and Sec. 4(a)(10)(A), respectively. ↩

12. American Institute of Certified Public Accountants, “Criteria for Stablecoin Reporting: Specific to Asset-Backed Fiat-Pegged Tokens” (2025; Part II controls criteria added January 2026), https://www.aicpa-cima.com/resources/download/stablecoin-reporting-criteria. The Criteria support examination-level engagements; they do not, by their existence, mean issuers perform examinations today. ↩

13. Circle, “USDC Monthly Reserve Reports,” https://www.circle.com/transparency (last visited June 2026). Evaluate the engagement type (AUP versus examination) on the face of each published report. ↩

14. GENIUS Act, 12 U.S.C. § 5903, Sec. 4(a)(1)(B) (redemption procedures and plain-language fee disclosure; fee changes on at least seven days’ notice). The redemption obligation itself derives from the “payment stablecoin” definition, Sec. 2(22) (issuer obligated to redeem for a fixed monetary value). ↩

15. Circle, “USDC Reserve Reports,” https://www.circle.com/transparency (last visited June 2026). The GENIUS Act prohibits paying interest or yield to holders at Sec. 4(a)(11). ↩

16. Issuer reserve figures change frequently. Confirm USDC against Circle’s transparency reporting (https://www.circle.com/transparency), USDT against Tether’s transparency page (https://tether.io/transparency), and PYUSD against Paxos’s transparency reporting before relying on any figure. ↩

17. PYUSD is issued by Paxos Trust Company; PayPal is the brand and distribution partner. See Paxos and PayPal transparency reporting for PYUSD reserve composition (cash and U.S. Treasuries), e.g., https://www.paxos.com/pyusd and PayPal’s PYUSD disclosures. ↩

18. See, e.g., CoinDesk, “Circle’s USDC Stablecoin Depegs After Silicon Valley Bank Exposure” (Mar. 11, 2023), https://www.coindesk.com; CNBC, coverage of USDC and the SVB failure (Mar. 11, 2023), https://www.cnbc.com. Circle disclosed approximately $3.3 billion of USDC reserves at Silicon Valley Bank; USDC traded near $0.87–$0.88 before regaining its $1 peg within roughly three days after the federal depositor backstop. Confirm specifics against the contemporaneous reporting. ↩

19. New York Department of Financial Services, “Guidance on the Issuance of U.S. Dollar-Backed Stablecoins” (June 8, 2022), https://www.dfs.ny.gov/industry_guidance/industry_letters/il20220608_issuance_stablecoins. ↩

20. State permissible-investment requirements vary by state; California’s Digital Financial Assets Law sets custody and reserve requirements for digital-asset licensees with specifics to be defined by regulation. Confirm current state requirements directly with each regulator. ↩