The Rise and Regulation of Payment Stablecoins

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Introduction

Stablecoins have evolved from a niche cryptocurrency innovation into one of the fastest-growing segments of digital finance. Originally developed to maintain a stable value by being pegged to a traditional currency such as the U.S. dollar, stablecoins are now widely used to facilitate trading, enable cross-border transfers, and increasingly serve as a direct means of payment. As adoption has expanded, and the market has grown to hundreds of billions of dollars in circulation, policymakers have begun to view stablecoins not only as digital assets, but also as financial instruments with the potential to play a larger role in the U.S. payment system. Before examining the emerging regulatory framework, it is useful to first understand how payment stablecoins function, what distinguishes them from other digital assets, and why maintaining confidence in their value depends on the quality and liquidity of the assets that back them.

Understanding Payment Stablecoins

Unlike many other cryptocurrencies, payment stablecoins are designed for utility. Rather than functioning as an investment that generates returns for holders, payment stablecoins are intended to serve as digital payment instruments that can be exchanged or redeemed on demand at par value. To support this redemption commitment, issuers maintain a portfolio of high-quality liquid reserve assets. Maintaining this one-for-one redemption promise depends on the issuer's ability to maintain sufficient reserves under a wide range of market conditions.

The defining characteristic of payment stablecoins is that they combine the price stability of traditional fiat currency with the speed and flexibility of blockchain-based payment networks. Unlike conventional bank transfers, which may be limited by business hours, intermediary institutions, or settlement delays, payment stablecoins can generally be transferred continuously across compatible blockchain networks. As a result, financial technology firms, payment providers, and traditional financial institutions have begun exploring payment stablecoins as a complement to existing payment systems, and they have become increasingly utilized for cross-border payments, settlement between financial institutions, and transactions within digital asset markets.

Today, the payment stablecoin market is dominated by a small number of issuers with different corporate backgrounds and business models. Tether (USDT), issued by Tether Holdings Ltd., emerged from the digital asset ecosystem and remains the largest payment stablecoin by market capitalization. USD Coin (USDC), issued by Circle Internet Group, was developed by a financial technology company focused on digital payments and blockchain based financial infrastructure. More recently, PayPal USD (PYUSD), issued by Paxos Trust Company on behalf of PayPal, reflects the entry of an established global payments company into the payment stablecoin market. Together, these issuers reflect the evolution of payment stablecoins from an innovation developed within crypto-markets to a financial instrument increasingly offered by established financial and payment companies. Although they differ in their corporate structure and approach to reserve management, they all seek to maintain a stable one-to-one value with the U.S. dollar by supporting their redemption commitments with portfolios of high-quality reserve assets.

The ability of a payment stablecoin issuer to honor redemption requests depends not only on the existence of reserve assets, but also on the quality and liquidity of those assets. Because holders expect to redeem their payment stablecoins for U.S. dollars at par value on demand, reserve portfolios consist primarily of highly liquid, dollar-denominated assets that can be converted into cash quickly with minimal risk of loss. Consequently, payment stablecoin issuers primarily hold cash, short-term U.S. Treasury securities , and repurchase agreements (repos). Cash provides immediate liquidity for routine redemption requests, while Treasury securities and repos preserve liquidity while generating modest returns.

To illustrate how issuers manage their reserves, Figure 1 compares the reserve composition of three representative U.S. dollar-pegged payment stablecoins, using data compiled from publicly available reserve reports and independent attestation reports. Although all three issuers rely primarily on high-quality liquid assets, they employ different reserve management strategies. USDC (Panel a) exhibits the greatest change in reserve composition over the sample period. Initially concentrated in U.S. Treasury securities, the portfolio gradually shifted toward a more balanced allocation of Treasury securities, repos, and cash. This shift reflects a greater emphasis on diversifying liquidity while preserving high-quality, dollar-denominated reserves. USDT (Panel b) consistently maintained Treasury securities as its largest reserve asset while gradually reducing its exposure to non-Treasury financial assets. As holdings of money market funds, commercial paper, certificates of deposit, and other investments declined, Treasury securities became an increasingly dominant share of the portfolio, simplifying what had historically been the most diversified reserve portfolio among the three issuers. PYUSD (Panel c) maintains the most concentrated reserve strategy, holding the overwhelming majority of its reserves in repos and the remainder primarily in Treasury securities, with only minimal holdings of cash and other assets. Despite these differences, all three issuers ultimately concentrate their reserves in highly liquid, dollar-denominated assets intended to preserve capital and support timely redemption.

Although payment stablecoins were initially developed to facilitate transactions within crypto markets, their adoption has expanded considerably over the past decade. Figure 2 illustrates the growth and evolution of the payment stablecoin market by tracking the historical market capitalization of three representative issuers using publicly available data obtained directly from CoinGecko. USDT grew steadily throughout the sample period, increasing from approximately $66 billion in mid-2022 to more than $180 billion by early 2026, remaining as the largest payment stablecoin by market capitalization. USDC followed a different trajectory, declining during 2022 and early 2023 before recovering steadily to approximately $75 billion by 2026. While considerably smaller in scale, PYUSD has expanded rapidly since its launch in 2023, growing from less than $300 million at the end of its first year to more than $4 billion by mid-2026. Together, these trends illustrate not only the continued expansion of the payment stablecoin market, but also the growing participation of both crypto-native firms and established financial institutions.

The entry of established financial institutions into the payment stablecoin market, and the coupled increase in payment stablecoins outstanding has transformed a niche digital asset into an increasingly important component of digital finance. As the market has expanded into hundreds of billions of dollars, maintaining confidence in issuers' ability to honor redemption requests became a matter of broader public interest. In recent years, Congress and federal regulators have established a comprehensive framework governing the issuance and supervision of payment stablecoins in the United States.

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Note: Reserve asset categories were harmonized across issuers to facilitate comparison. USDC and PYUSD reserve portfolios are reported monthly, while USDT reserve portfolios are reported quarterly. "Other Reserve Assets" includes all remaining reserve assets. 
Source: Author’s Calculations based on publicly available reserve reports & attestation reports issued by Circle Internet Group (USDC), Tether Holdings Limited (USDT), and Paxos Trust Company on behalf of PayPal USD (PYUSD).

Figure 2: Market Capitalization of Selected Payment Stablecoins

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Note: PYUSD is displayed using the same scale as USDT & USDC, making substantial percentage growth appear small relative to other issuers.
Source: Historical daily market capitalization data obtained directly from CoinGecko for USDT, USDC, and PYUSD. The data is presented without modification, aggregation, or adjustment.

Implementing the GENIUS Act

As payment stablecoins have grown in both scale and economic significance, policymakers have sought to establish a regulatory framework to support their continued development while addressing the unique risks associated with digital payment instruments. This effort culminated, in July of 2025, with the enactment of the Guiding and Establishing National Innovation for U.S. Stablecoins (GENIUS) Act, the first comprehensive federal statute governing the issuance, supervision, and operation of payment stablecoins in the United States. In addition to defining payment stablecoins and establishing standards for their issuance and oversight, the Act creates federal and state licensing pathways for eligible issuers, establishes reserve and redemption requirements, provides protections for payment stablecoin holders, and assigns implementation responsibilities to the appropriate federal agencies. To execute the statute, Congress chose to work through the existing framework for bank regulation. As a result, the Office of the Comptroller of the Currency (OCC), the Federal Deposit Insurance Corporation (FDIC), the National Credit Union Administration (NCUA), the Financial Crimes Enforcement Network (FinCEN), and other federal agencies have begun issuing a series of proposed and final rules to implement the Act's requirements.

Who may issue Payment Stablecoins?

A principal element of the GENIUS Act is the creation of a clearly defined legal category of Permitted Payment Stablecoin Issuers (PPSIs). Rather than permitting any private entity to issue payment stablecoins, the Act limits issuance to regulated institutions that satisfy specified requirements. Eligible issuers include subsidiaries of insured depository institutions, federally qualified nonbank entities approved under a federal licensing framework, and state-qualified issuers operating under state supervisory regimes that are certified as substantially similar to the federal framework. This approach establishes a common set of eligibility standards while allowing different types of financial institutions to participate in the payment stablecoin market.

Although the GENIUS Act establishes a common framework governing eligible issuers, implementation is shared among several federal regulators according to the type of institution seeking to issue payment stablecoins. The OCC oversees national banks and federally-licensed nonbank issuers, the FDIC supervises state nonmember banks, and the NCUA oversees federally-insured credit unions. By preserving existing supervisory responsibilities while applying a common framework, the GENIUS Act integrates payment stablecoin issuance into the existing banking regulatory system rather than creating an entirely new supervisory authority.

How are Payment Stablecoins regulated?

Implementing regulations issued by the OCC, FDIC, NCUA, and the Department of the Treasury are in the proposed rule stage and therefore remain subject to change during the federal rulemaking process. Nevertheless, a common objective emerges among the proposals: that of ensuring that stablecoins remain redeemable at par value while limiting the risks posed to holders and the broader financial system. Various mechanisms have been proposed to meet this purpose, including standards governing reserve asset quality, redemption rights, operational risk management, public disclosures, and corporate governance.

Among these requirements, reserve asset standards form the cornerstone of the regulatory framework in all the core proposals. Consistent with the reserve portfolios discussed in the previous section, the implementing rules require payment stablecoins to be backed on a one-for-one basis by high-quality, highly liquid reserve assets, including cash, deposits at insured depository institutions, balances held at Federal Reserve Banks, short-term U.S. Treasury securities, repurchase agreements collateralized by Treasury securities, certain government money market funds, and other regulator-approved federal government assets. Beyond identifying eligible reserve assets, the proposed rules introduce quantitative prudential standards intended to limit concentration and liquidity risks. Under the proposed safe-harbor approach, issuers would maintain at least 10 percent of reserve assets as immediately available deposits or balances at a Federal Reserve Bank, at least 30 percent of reserve assets in assets that are immediately available or mature within five business days, hold no more than 40 percent of reserve assets at any single eligible financial institution, and maintain a weighted average reserve maturity of no more than 20 days. Collectively, these standards seek to ensure that reserve portfolios remain sufficiently diversified and liquid to satisfy large redemption requests without requiring the sale of assets with longer maturities under stressed market conditions.

Beyond reserve quality, the agencies’ proposed rules also establish standards governing how reserve assets are managed and how issuers interact with stablecoin holders. For example, issuers must maintain the administrative capability to convert reserve assets into cash and honor redemption requests at par value upon demand. In addition, there are disclosure requirements, as issuers must publish monthly reserve composition reports detailing outstanding payment stablecoins, reserve asset composition, average maturities, and the geographic location of reserve custody. For larger issuers with more than $25 billion in outstanding payment stablecoins, the proposals would also require that at least 0.5 percent of reserve assets, up to $500 million, be maintained as fully insured deposits or insured shares, providing an additional layer of liquidity. Finally, the framework reaches into corporate governance by requiring certain internal controls to ensure prudent reserve management.

The individual requirements established throughout the implementing rules are best viewed as components of a broader framework designed to preserve confidence in payment stablecoins. Licensing standards determine who may issue payment stablecoins, reserve requirements protect their ability to maintain one-to-one redemption, and governance and disclosure requirements to promote transparency. Together, these safeguards are intended to facilitate trust in payment stablecoins by ensuring that issuers maintain the capacity necessary to honor their redemption commitments under a wide range of market conditions.

Conclusion

Payment stablecoins have evolved from a niche innovation within cryptocurrency markets into an increasingly important component of the digital payments ecosystem. As their adoption expanded and their integration with traditional financial markets accelerated, policymakers have recognized that preserving confidence in these instruments requires more than voluntary reserve management practices. The GENIUS Act and the implementing regulations establish the first comprehensive federal framework governing the issuance, supervision, and operation of payment stablecoins in the United States, providing greater clarity regarding who may issue them, how reserve assets must be managed, and the safeguards designed to protect payment stablecoin holders.

Although this regulatory framework will continue to evolve as agencies finalize their implementing regulations and payment stablecoin markets mature, its broader direction is now clear. Congress has recognized payment stablecoins as a distinct category of digital payment instruments, while integrating their issuance and supervision into the existing federal banking regulatory framework.