For years "stablecoin" was a marketing word with no federal definition behind it, and the central question, what actually backs the token, was answered by issuer attestations of varying rigor rather than by law. That has changed with the Guiding and Establishing National Innovation for U.S. Stablecoins Act, known as the GENIUS Act, and the federal rulemaking now implementing it. One of the implementing proposals, published in the Federal Register, lays out the reserve, redemption, and disclosure obligations in concrete terms, and it is the document to read instead of any issuer's own description of its backing.

The proposal in question comes from the National Credit Union Administration and addresses the issuance of payment stablecoins by entities subject to its jurisdiction. It is one piece of a broader structure: the GENIUS Act, as the rulemaking explains, charges the NCUA with licensing, regulating, and supervising payment stablecoin issuers that are subsidiaries of federally insured credit unions, while other federal regulators oversee issuers chartered differently. The reserve standard the proposal describes, however, reflects the statute's baseline requirements that apply to permitted payment stablecoin issuers generally.

"PPSIs must maintain reserves backing the Payment Stablecoin on a one-to-one basis using U.S. currency or certain other liquid assets, as specified. PPSIs must also publicly disclose their redemption policy and publish monthly the details of their reserves."— Federal Register (NCUA, GENIUS Act implementation), source

Three obligations sit in that passage, and each addresses a specific historical failure mode. The one-to-one reserve requirement, met with U.S. currency or certain other liquid assets, is aimed at the gap between a token's claimed peg and the quality and quantity of what actually stands behind it. The phrase "as specified" matters: the rule does not permit a stablecoin to be backed by arbitrary assets, but by the limited, liquid categories the regulation enumerates. The public redemption-policy disclosure addresses the question of whether and how a holder can convert a token back into dollars, on what terms and timeline. And the monthly publication of reserve details addresses transparency, replacing occasional or unverifiable claims with a recurring, public accounting.

Who supervises which issuers

The GENIUS Act does not create a single stablecoin regulator. The rulemaking notes that the statute details a process involving the primary federal payment stablecoin regulators, which include the NCUA, the Federal Deposit Insurance Corporation, and other federal banking agencies, with the regulator determined by how an issuer is chartered and supervised. That is why stablecoin rulemaking is appearing from multiple agencies in parallel: the Federal Register in this period also carries separate proposals on Bank Secrecy Act and sanctions-compliance standards for stablecoin issuers and on customer-identification programs for permitted payment stablecoin issuers. Each agency is implementing its slice of the same statutory framework for the issuers under its authority.

Why one-to-one, liquid, and monthly are the load-bearing terms

Each adjective in the reserve requirement is doing specific work, and the history of stablecoin episodes explains why. "One-to-one" addresses the quantity question: there must be a dollar of qualifying reserve for every dollar of token outstanding, which rules out fractional backing where an issuer holds less than it has issued. "Liquid" addresses the quality question: reserves must be assets that can be converted to cash quickly and without large loss, which rules out backing a supposedly stable token with volatile or hard-to-sell holdings whose value could fall just when redemptions spike. And "monthly" addresses the verification question: a backing claim that cannot be independently observed on a regular schedule is, in practice, an assertion rather than a fact, so the rule requires the issuer to publish the details of its reserves every month. The three together convert "trust us, it's backed" into a checkable, recurring, regulated obligation.

The redemption-policy disclosure pairs with the reserve rule. Holding adequate reserves is only useful to a token holder if there is a defined, public path to exchange the token back for dollars on stated terms. By requiring issuers to disclose that policy publicly, the framework makes the redemption right a published commitment rather than a discretionary courtesy, which is what distinguishes a regulated payment stablecoin from an unbacked token that merely claims a peg.

What the rule standardizes, and what it leaves to specification

The value of reading the rulemaking directly is that it converts a fuzzy concept into checkable requirements. A "payment stablecoin" under this framework is not simply any token that claims a dollar peg; it is a regulated instrument whose issuer must hold qualifying reserves one-to-one, publish those reserves monthly, and disclose how redemption works. Several of the precise boundaries, exactly which liquid assets qualify, the format of the monthly disclosure, the mechanics of redemption, are set by the detailed regulatory text and the related agency proposals rather than by the summary language. As a proposed rule, the document is also subject to public comment before it is finalized, so the specifics can evolve.

The durable takeaway is the statutory backbone the rulemaking implements. Under the GENIUS Act framework as described in the Federal Register, a permitted payment stablecoin must be backed one-to-one by U.S. currency or specified liquid assets, its issuer must disclose its redemption policy publicly, and it must publish the details of its reserves every month, all under the supervision of a designated federal regulator. That is a different world from the attestation era, and the primary documents, not the issuers' own dashboards, are where the requirements are actually defined.