Stablecoin Bill Metrics: US House vs Senate Drafts

The legislative question is no longer whether reserves must cover 100% of outstanding tokens. It is what mechanism enforces that ratio when redemption pressure arrives.

Reserve Architecture Under the House Draft

The Clarity for Payment Stablecoins Act defines the reserve as a closed system of high-quality liquid assets. Under the House framework, a stablecoin issuer must hold reserves in cash, central bank reserves, or US Treasury bills with a residual maturity of 90 days or less. The maturity ceiling is a deliberate engineering constraint: it forecloses duration risk on the issuer's balance sheet by construction, not by supervisory discretion. A 90-day T-bill portfolio reprices within the same window as a typical redemption cycle, so mark-to-market on the reserve book cannot diverge from par by enough to impair redemption under normal conditions.

The draft imposes 100% backing against outstanding stablecoins. The ratio is not a target — it is a hard floor that must be preserved continuously. The enforcement mechanism runs through periodic attestation reports and supervisory examination rather than through capital buffers, leverage limits, or resolution planning. There is no Tier 1 capital component, no stress-tested loss-absorption cushion, and no ex-ante resolution fund at the issuer level.

The consequence is a thin-walled structure: high-quality collateral, instantaneous liquidity, and a supervisory regime that verifies the composition of the reserve but does not require the issuer to absorb shocks with its own capital. In a liquidation scenario, asset recovery depends entirely on the marketability of the eligible assets, not on the issuer's balance sheet. Liquidators are working from a portfolio of 90-day Treasuries, not from a recapitalized going concern.

The mint and burn mechanics of compliant tokens follow directly from this construction. A token holder exercising redemption triggers a burn at par against the issuer's reserve position. Because the reserve is dominated by short-duration Treasuries, the issuer can satisfy redemption without triggering fire-sale pricing on its own books — provided redemptions remain within the natural roll-off of the maturing T-bill book. The structural vulnerability is concentrated, not diffused: a coordinated redemption demand larger than the rolling Treasury maturities would force the issuer into the secondary market, where price impact becomes the binding constraint.

Senate Frameworks: Compliance-First Construction

The Senate approach inverts the priority order. The Lummis-Gillibrand framework, which remains the most detailed Senate proposal in circulation, treats compliance infrastructure — not the reserve asset mix — as the binding constraint on systemic risk. Under this draft, stablecoin issuers must adhere to Bank Secrecy Act obligations equivalent to those applied to traditional financial institutions: full KYC/AML program requirements, suspicious activity reporting, transaction monitoring, and recordkeeping regimes already operating inside the banking perimeter.

The 100% reserve mandate remains in place, but the Senate draft does not restrict eligible assets to the same narrow 90-day window as the House. Eligible reserves include high-quality liquid assets, with the definition intended to be set by the prudential regulator rather than fixed in statute. This gives the Federal Reserve or the OCC flexibility to expand or contract the eligible asset list as market conditions evolve.

The House draft treats reserves as an isolated liquidity engineering problem. The Senate draft treats issuance as an extension of the bank compliance perimeter.

The compliance-first framing has direct mechanical consequences. It determines what an issuer must build before issuing the first token. A House-compliant issuer can stand up the reserve book and begin issuance relatively quickly; a Senate-compliant issuer must first integrate with BSA infrastructure, which effectively requires a bank-grade compliance stack from day one. The Senate regime therefore privileges incumbent financial institutions and licensed banks over de novo issuers that lack existing compliance rails.

The arbitrage loop that keeps a well-designed stablecoin at par — secondary market pressure equalizing deviation through mint and redemption flows — is reshaped by this constraint. A Senate-compliant issuer can only operate inside a compliance architecture that monitors, records, and reports every redemption flow at the level of detail the BSA requires. The redemptive pressure that defines peg maintenance therefore arrives at the issuer pre-filtered by compliance review. This produces a slower but more transparent redemption process and a smaller population of issuers capable of running it.

Federal vs State Authority: Bifurcated vs Integrated Supervision

The two drafts disagree most visibly on who supervises the issuer. The House framework authorizes state regulators to charter and supervise stablecoin issuers under a defined federal baseline. A state regime that meets the federal standard — capital adequacy, reserve composition, redemption procedures, reporting cadence — may operate without direct federal preemption. The Federal Reserve retains authority to set standards for reserve management and to intervene if state oversight is deemed insufficient. The trigger for intervention is not specified in the statute; it remains a discretionary supervisory action gated by examiner judgment.

The Senate framework leans toward direct federal prudential oversight, particularly for issuers above a defined size threshold. Issuers deemed "systemically important" fall under a federal regulator — most plausibly the OCC or the Federal Reserve — rather than a state charter. The exact threshold for systemic classification remains the single most consequential unresolved variable in the Senate process. It determines which issuers face capital rules, examination cycles, and resolution planning requirements equivalent to banks, and which issuers continue operating under lighter state supervision.

The structural implication is significant. Under the House regime, the federal government sets the rulebook and intervenes when state supervision breaks down. Under the Senate regime, the federal government becomes the primary supervisor for the issuers that matter most for financial stability, and state charters become a smaller-tier pathway for issuers below the systemic threshold. Both models produce a two-tier industry; they disagree on which tier carries the heavier prudential load.

Global Benchmarks: MiCA and the FSB Standards

The EU's Markets in Crypto-Assets Regulation (MiCA), whose stablecoin provisions entered into application in June 2024, is now the operative reference point for global reserve standards. MiCA classifies dollar-denominated payment tokens as E-Money Tokens and imposes two structural requirements that differ from both US drafts.

First, MiCA requires issuers of E-Money Tokens to hold at least 30% of their reserves in separate accounts at credit institutions. The segregation rule is a bankruptcy-remote mechanism. The 30% bucket is held at a regulated depository in a structure designed to remain accessible to token holders even if the issuer enters resolution. Both US drafts address segregation implicitly through reserve composition rules, but neither imposes a hard 30% deposit floor at credit institutions.

Second, MiCA imposes redemption rights enforceable against the issuer at par in fiat, on demand. The Financial Stability Board's global recommendations align with this requirement: stablecoin issuers must provide redemption to all holders at par, backed by 1:1 high-quality liquid assets held at all times. Both US drafts accept these obligations in principle; the operational implementation differs. MiCA redemptions are creditor claims against the issuer's segregated deposits; the US drafts rely on reserve composition and supervisory enforcement to produce the same outcome.

The following comparison summarizes the structural differences across the three frameworks:

The table makes the architectural disagreement visible. Both US drafts sit closer to each other than either sits to MiCA, but they resolve the same trade-off — liquidity through asset quality (House) versus liquidity through institutional integration (Senate) — through different mechanisms.

Path Resolution: Gridlock and Stress-Test Limits

Neither chamber has produced a bill that can clear conference committee. The House Financial Services Committee advanced the Clarity Act in 2023, but floor action has not followed. The Senate Banking Committee continues to negotiate on the Lummis-Gillibrand framework, with no clear timetable for markup. The two chambers operate from different committee priorities: House leadership favors a market-structure-first approach that preserves state charters; Senate negotiators favor a compliance-first approach that pulls issuers into the bank perimeter. Neither side has conceded the other's central premise.

Both drafts converge on 100% backing but diverge on the mechanism enforcing it — and the mechanism determines whether the regime survives a stress event.

The unresolved mechanical questions are not abstract. They determine issuer behavior at three failure points: redemption under bank holiday conditions, resolution following issuer insolvency, and contagion from a depeg event at a systemically significant issuer.

Redemption under bank holiday conditions. The Senate framework, by tying issuers to BSA-equivalent compliance and bank-grade operational standards, produces a redemption process that inherits bank holiday constraints — including the possibility of temporary suspension of cash withdrawals. The House framework does not automatically inherit bank holiday constraints because it treats the issuer as a payments entity rather than a bank. The result is asymmetric: a Senate-compliant issuer may lawfully delay redemption under conditions that do not lawfully bind a House-compliant issuer.

Resolution. The House draft provides for receivership at the issuer level, with liquidators empowered to sell the reserve book. The Senate draft contemplates resolution under bank-style procedures for systemic issuers, including potential conversion of token claims into equity in a bridge entity. The two procedures produce different loss profiles for token holders. House-style receivership depends on the marketability of 90-day T-bills under stress; Senate-style resolution depends on the resilience of an institution embedded in the Federal Reserve's supervisory architecture.

Contagion from a depeg event. The Financial Stability Board's recommendations require that 1:1 backing be preserved "at all times" — language that creates an instantaneous obligation rather than a periodic attestation obligation. Neither US draft has incorporated "at all times" as a statutory standard; both rely on attestation cadence and supervisory intervention. The gap between FSB language and US drafting is the most material divergence from global norms in either bill.

Open Engineering Variables

The systemic threshold remains the single most consequential draft variable. A low threshold places most issuers under federal supervision and forces the bank compliance perimeter to absorb a large portion of the industry. A high threshold leaves the largest issuers under state supervision, where the House draft envisions reserve adequacy enforcement without the institutional machinery of bank supervision. Both outcomes are mechanically defensible; both produce different industry compositions.

The reserve asset window — 90 days in the House draft, regulator-defined in the Senate draft — affects an issuer's ability to earn yield on the reserve book. A narrow window constrains yield; a broad window permits duration extension but reintroduces the interest-rate risk that the 90-day ceiling was designed to eliminate. The yield differential matters economically: narrower windows impose a carry cost on the issuer, which compresses the profitability of pure-play issuance and concentrates the industry in entities that can subsidize the reserve book from non-stablecoin revenue.

The MiCA 30% segregation rule, if adopted in any US draft, would mechanically transmit deposit flows into credit institutions and reduce the proportion of reserves held directly in government securities. Neither US draft has adopted a comparable rule, but the segregation question is live in conference negotiations, and the EU implementation now provides a working precedent.

Closing Position

The US stablecoin legislation question has narrowed materially. Both drafts accept 100% backing, both accept redemption at par, and both accept that some form of supervisory regime will govern issuers. The unresolved question is the engineering of the regime that enforces the 100% requirement under stress. The House draft answers with reserve composition and state supervision under a federal backstop. The Senate draft answers with bank-grade compliance, federal supervision for systemic issuers, and broader reserve asset flexibility set by the prudential authority. MiCA answers with segregation at credit institutions and a narrower credit-risk footprint for the issuer itself. None of the three architectures has been operationally tested under a true redemption-stress event. The drafts now in committee will be evaluated against that test, even if the test has not yet occurred.