BIS Bulletin on Cross-Border Stablecoin Flows: Policy Challenges as Crypto Reaches $255 Billion

BIS Bulletin 108: Why Stablecoin Growth Demands New Policy Thinking

The Bank for International Settlements has published Bulletin No. 108, a concentrated but deeply consequential analysis of stablecoin growth and the policy challenges it creates for central banks, financial regulators, and monetary authorities worldwide. The bulletin arrives at a moment when the stablecoin sector has crossed a threshold from niche crypto infrastructure to a force that materially affects the world’s most important sovereign debt markets, cross-border capital flows, and the structural composition of bank funding.

The bulletin’s central argument challenges a widely invoked regulatory principle: “same risks, same regulation.” While this approach has served regulators well for decades in dealing with financial innovation within traditional markets, the BIS contends that stablecoins present risks that are not truly the “same” as those posed by money market funds, exchange-traded funds, or electronic money. Their borderless, pseudonymous, and permissionless nature creates a qualitatively different risk profile that demands bespoke regulatory frameworks tailored to the unique characteristics of crypto-native financial instruments. This represents a significant evolution in official-sector thinking about digital asset regulation.

Stablecoin Market at $255 Billion: Scale, Concentration, and Dollar Dominance

The stablecoin market has undergone dramatic expansion. Market capitalization has grown from approximately $125 billion less than two years ago to roughly $255 billion as of mid-2025—a doubling that occurred against the backdrop of broader crypto market recovery and increasing institutional interest. The number of active stablecoins has surged from approximately 60 in mid-2024 to over 170 currently, reflecting both new entrants and the expansion of existing issuers across multiple blockchain networks.

Two metrics place this growth in systemic context. The stablecoin market capitalization is now equivalent to approximately 1.5% of US bank deposits and roughly 4% of assets held by US government money market funds. While these percentages may appear modest, they represent a concentration of risk that the BIS finds concerning because of the market’s extreme issuer concentration: Tether (USDT) and Circle (USDC) together account for approximately 90% of total stablecoin market capitalization. This means that operational failure, regulatory action, or a confidence crisis at either issuer would immediately affect the vast majority of the stablecoin ecosystem.

The currency denomination pattern adds another dimension of systemic importance. Nearly 70% of active stablecoins by count are denominated in US dollars, but the dominance by market value is even more extreme: almost 99% of all stablecoin value is dollar-denominated. Other denominations—EUR, CNH, JPY, GBP, and commodity-backed variants—are negligible in terms of market share. This overwhelming dollar dominance has profound implications for monetary sovereignty, particularly in emerging market economies where stablecoins may offer more accessible and reliable dollar exposure than traditional banking channels.

Cross-Border Stablecoin Flows Exceed $400 Billion per Quarter

The BIS bulletin presents striking data on cross-border stablecoin flows, drawing on research from the related BIS Working Paper “DeFiying Gravity?” by Auer, Lewrick, and Paulick. Quarterly cross-border trading volumes for the two largest stablecoins exceed $400 billion—a figure that positions stablecoins as a significant channel for international capital movement, comparable in scale to the cross-border activity of many mid-sized national banking systems.

The drivers of these flows carry important policy implications. Cross-border stablecoin transfers tend to increase following episodes of high inflation and foreign exchange volatility in both sending and receiving countries. This pattern suggests that stablecoins are being deployed as instruments for capital flight, currency hedging, or accessing dollar-denominated value during periods of domestic economic stress. Countries with higher stablecoin awareness—measured by internet search volume for stablecoin-related terms—exhibit even greater increases in cross-border flows during stress periods, indicating that financial literacy about crypto alternatives accelerates their adoption as economic escape valves.

For policymakers in jurisdictions that rely on capital controls or foreign exchange regulations, these findings represent a direct challenge. Traditional capital control mechanisms—bank reporting requirements, foreign exchange registration, and cross-border transaction monitoring—were designed for a financial system where international transfers require intermediaries that can be supervised and regulated. Stablecoins operating on permissionless blockchains bypass these intermediaries entirely, enabling value transfer across borders through pseudonymous addresses that are extremely difficult to monitor in real time.

Stablecoin Impact on US Treasury Bill Yields and Fire-Sale Risk

Perhaps the most striking empirical finding in the BIS bulletin concerns the measurable impact of stablecoin flows on US Treasury bill yields. The research demonstrates that a $3.5 billion inflow into stablecoins—approximately two standard deviations above the mean—reduces Treasury bill yields by 2.5 to 5 basis points as issuers purchase T-bills to back newly minted stablecoins. At current market scale, this positions stablecoin issuers as participants in Treasury markets whose purchasing activity rivals that of investors in large sovereign nations and major government money market funds like those managed by JPMorgan and Fidelity.

The more concerning finding is the asymmetry of this impact. While stablecoin inflows reduce Treasury yields modestly, outflows increase yields by two to three times as much. This asymmetric pattern is consistent with fire-sale dynamics: when stablecoin holders redeem their tokens, issuers must sell Treasury holdings rapidly to generate the cash needed for redemptions. Forced selling under time pressure depresses bond prices (raising yields) more sharply than equivalent voluntary purchases boost prices. If this pattern scales with the stablecoin market, a major stablecoin run could generate Treasury market dislocations that propagate through the broader fixed-income ecosystem.

The bulletin also reveals that stablecoin market capitalization responds to monetary policy in a pattern that diverges sharply from traditional money market funds. While MMFs typically attract inflows when interest rates rise—offering investors a higher-yielding cash alternative—stablecoin market capitalization declines during monetary tightening. Because stablecoins typically do not pay interest, rising rates increase the opportunity cost of holding non-yielding stablecoin tokens relative to Treasury bills, MMFs, or even high-yield savings accounts. The emergence of tokenized MMF shares that offer par convertibility plus market interest rates could accelerate this substitution effect, creating competitive pressure that stablecoin issuers will need to address.

Monetary Sovereignty Under Pressure from Dollar-Pegged Stablecoins

The near-total dollar dominance of the stablecoin market—99% by market value—creates what amounts to a parallel dollar payment system that operates outside the institutional frameworks designed to manage dollar circulation and monetary policy transmission. For the United States, this represents an extension of dollar influence through private-sector channels. For every other jurisdiction, it represents a potential erosion of monetary sovereignty.

The mechanism is straightforward: when residents of a country experiencing currency weakness or inflation purchase dollar-denominated stablecoins, they effectively dollarize a portion of their savings without the intermediation of domestic banking systems, central bank foreign exchange reserves, or regulated currency markets. The BIS evidence that cross-border stablecoin flows increase during periods of domestic macroeconomic stress confirms that this substitution is already happening at meaningful scale. Unlike traditional dollarization—which requires access to physical US currency or correspondent banking relationships—stablecoin-based dollarization requires only a smartphone and an internet connection.

Central banks in emerging and developing economies face a particularly acute version of this challenge. Monetary policy effectiveness depends on the central bank’s ability to influence the cost and availability of money within its jurisdiction. If a growing share of domestic economic activity shifts to dollar-denominated stablecoins, the transmission mechanism of domestic interest rate changes weakens. This is not a theoretical concern: the BIS bulletin presents evidence that stablecoin adoption correlates with macroeconomic conditions that precisely indicate declining confidence in domestic monetary institutions.

How Stablecoins Transform Bank Funding and Financial Interconnections

The BIS bulletin identifies a structural transformation in bank funding that has received insufficient attention in the broader regulatory debate. Stablecoin issuers pool dispersed, largely insured retail deposits and channel them back to the banking system as uninsured wholesale deposits or through reverse repurchase agreements. This intermediation step fundamentally changes the risk profile of the underlying deposits.

In the traditional banking model, retail deposits are individually small, diversified across millions of depositors, protected by deposit insurance up to statutory limits, and generally “sticky”—unlikely to be withdrawn in response to modest changes in market conditions or bank-specific stress. When these same deposits are aggregated by a stablecoin issuer and redeposited as a single large institutional balance, they lose every one of these stabilizing characteristics. The resulting deposit is large, concentrated, uninsured, and subject to rapid withdrawal if the stablecoin issuer faces redemption pressure.

This transformation creates a new channel of interconnection between the crypto ecosystem and the traditional banking system. A stablecoin run—triggered by regulatory action, issuer controversy, or market panic—would not only affect stablecoin holders but would cascade into bank funding markets as issuers withdraw their deposits and liquidate reverse repo positions. The concentrated nature of the stablecoin market—where two issuers hold approximately $137 billion in Treasury securities and $57 billion in Treasury repo combined—means that the banking system’s exposure to this new funding channel is concentrated among a small number of counterparties.

Why Same Risks Same Regulation Falls Short for Crypto

The BIS bulletin’s most provocative contribution to the policy debate is its explicit argument that the widely invoked principle of “same risks, same regulation”—also known as “same activity, same regulation”—is fundamentally inadequate for stablecoins. This principle has been the bedrock of financial regulatory philosophy for decades, enabling regulators to apply existing rules to new products that perform equivalent economic functions. The BIS contends that stablecoins break this paradigm.

The argument hinges on three characteristics that distinguish stablecoins from any traditional financial instrument: they are borderless (circulating freely across jurisdictions on global blockchain networks without requiring intermediary approval), pseudonymous (operating through wallet addresses that do not inherently reveal the identity of their controllers), and permissionless (accessible to any participant without requiring authorization from a regulated entity). No traditional financial product combines all three characteristics, which means that regulatory frameworks designed for bank deposits, money market funds, or electronic money systematically fail to address the risk vectors created by this combination.

The BIS proposes instead a “bespoke, tailored” approach that builds on traditional regulatory principles but adds specific measures designed for crypto-native instruments. Critically, the bulletin emphasizes that bespoke frameworks “need not imply a reduction in regulatory stringency”—in fact, because stablecoin ecosystem participants typically operate without the established safeguards present in traditional finance (deposit insurance, central bank lender-of-last-resort facilities, established supervisory relationships), more restrictive regulation may be warranted. This positions the BIS firmly against a “light touch” approach to stablecoin regulation and aligns with the view that international standards need to evolve beyond simple analogies.

Stablecoin Volatility: Not Actually Stable

The BIS bulletin provides empirical evidence that stablecoins do not consistently maintain their $1.00 par value—a finding that challenges the foundational marketing promise of the entire product category. Even the two largest and most established fiat-backed stablecoins, Tether and USDC, exhibit persistent deviations from par: low prices reached $0.96 in 2021, $0.95 in 2022, and $0.88 in 2023 (during the Silicon Valley Bank crisis). These deviations occurred not in obscure corners of the crypto market but in the most liquid and widely-used stablecoins available.

The volatility picture becomes dramatically worse for stablecoin categories beyond fiat-backed varieties. Algorithmic stablecoins, crypto-backed stablecoins, and commodity-backed stablecoins exhibit volatility that in some cases exceeds that of the S&P 500 or even Bitcoin itself. This is a remarkable finding: instruments marketed as “stable” occasionally demonstrate higher price variability than the very assets they are designed to provide stability against. The collapse of the TerraUSD algorithmic stablecoin in May 2022—which wiped out approximately $40 billion in value within days—remains the most dramatic illustration of this disconnect between marketing claims and actual performance.

This instability has direct implications for the “moneyness” question central to regulatory design. A core attribute of money is the “no-questions-asked” property—the expectation that an instrument can always be exchanged at face value without investigation. Bank deposits achieve this through institutional frameworks including deposit insurance, prudential regulation, and central bank backstops. Stablecoins achieve it only when market conditions remain benign, and the achievement disappears precisely when the NQA property matters most—during stress periods when holders most need confidence that their holdings are safe.

AML and Financial Integrity Challenges in Crypto Markets

The BIS bulletin identifies financial integrity as one of four major policy challenge categories, highlighting the structural difficulties that stablecoins present for anti-money laundering and counter-terrorism financing (AML/CFT) compliance. As digital bearer instruments circulating on permissionless blockchains, stablecoins enable value transfer between pseudonymous addresses without the intermediary oversight that characterizes traditional financial transactions.

The know-your-customer (KYC) challenge is particularly acute at the boundary between centralized exchanges (where identity verification is typically required) and self-hosted wallets (where it is not). Once stablecoins are withdrawn from an exchange to a self-hosted wallet, they can be transferred freely between pseudonymous addresses without additional identity verification. Current AML frameworks rely heavily on regulated intermediaries—banks, money transmitters, payment processors—to monitor and report suspicious activity. When the intermediary layer is removed, as it is for peer-to-peer stablecoin transfers on permissionless blockchains, these frameworks lose their primary enforcement mechanism.

However, the BIS offers a constructive counterperspective: the traceability of stablecoin provenance on public blockchains could be leveraged to design more effective AML/CFT systems. Unlike cash—the traditional bearer instrument—blockchain-based stablecoins create a permanent, auditable record of every transfer. Regulators and compliance teams with the right analytical tools could track stablecoin flows more comprehensively than is possible with any traditional payment system. The challenge lies in developing the regulatory technology and legal frameworks needed to exploit this transparency effectively, particularly at the interface between the crypto ecosystem and the regulated financial system.

BIS Policy Framework for Stablecoin Regulation

The bulletin concludes by outlining a policy approach that combines functional regulation with bespoke measures. The BIS advocates identifying each role that stablecoins play—means of payment, store of value, collateral, settlement instrument—and applying proven regulatory strategies from the analogous traditional finance function. However, each layer of regulation must be supplemented with tailored measures addressing stablecoins’ unique borderless, pseudonymous, and permissionless characteristics.

The BIS emphasizes that almost 70% of jurisdictions surveyed already have or are developing stablecoin-specific regulatory frameworks, indicating significant global momentum toward formalized oversight. International coordination is essential given that stablecoins move effortlessly across borders, making purely national approaches insufficient. The bulletin references established international frameworks from CPMI-IOSCO, the Financial Stability Board, IOSCO, and the Basel Committee as foundations for coordinated global action.

A key policy recommendation concerns liquidity risk management. Given the asymmetric impact of stablecoin flows on Treasury yields—where outflows move yields two to three times as much as equivalent inflows—the BIS argues that regulatory requirements to strengthen issuers’ liquidity risk management and their capacity to withstand redemption shocks are warranted. This recommendation directly addresses the fire-sale dynamics identified in the empirical research and would bring stablecoin issuers closer to the liquidity requirements that govern traditional money market funds, albeit through a framework specifically designed for the unique operational characteristics of crypto-native issuers. The broader message is clear: stablecoins have outgrown the period where benign neglect was an acceptable regulatory posture, and the frameworks needed to manage their systemic implications must be both rigorous and specifically tailored to the novel risks they present.