How Stablecoins Reshape Treasury Yields: Key BIS Research Findings

Understanding the BIS Working Paper on Stablecoins and Safe Assets

The Bank for International Settlements recently published Working Paper No. 1270, a rigorous empirical study examining how stablecoins and treasury yields have become deeply intertwined. Authored by a team of BIS researchers, the paper uses daily data spanning January 2021 through March 2025 to quantify the price impact of dollar-backed stablecoin flows on short-term US government debt. The findings reveal something remarkable: digital tokens originally designed for cryptocurrency trading now exert measurable demand pressure on one of the world’s most important financial benchmarks.

At its core, the research addresses a straightforward question with profound implications. When billions of dollars flow into stablecoins like Tether (USDT) and USD Coin (USDC), issuers must invest those funds in safe, liquid assets—primarily US Treasury bills. This purchasing activity compresses yields in ways that echo the effects of central bank quantitative easing, albeit on a smaller scale. The BIS working paper demonstrates that these effects are not hypothetical but statistically significant and economically meaningful, particularly during periods when Treasury bill supply is already constrained.

For investors, policymakers, and anyone following the evolution of digital finance, this research represents a critical turning point. Stablecoins are no longer a niche cryptocurrency phenomenon—they are active participants in the plumbing of global sovereign debt markets. Understanding how stablecoin reserves interact with Treasury pricing is essential for anyone navigating today’s financial landscape, as explored in our guide to digital assets and financial markets.

How Stablecoins Became Major Treasury Market Players

The rise of stablecoins from a cryptocurrency convenience tool to a significant force in US Treasury markets has been nothing short of extraordinary. Dollar-backed stablecoin issuers purchased $35 billion of Treasury bills in 2024 alone, followed by another $33 billion in 2025. These figures place stablecoin issuers on par with the largest sovereign and institutional Treasury investors globally—a status that would have seemed inconceivable just five years ago.

This transformation occurred because stablecoins serve a dual purpose. For cryptocurrency traders, they provide a stable medium of exchange and a parking spot for funds between trades. For issuers, however, they represent a massive pool of capital that must be invested conservatively to maintain the one-to-one dollar peg. US Treasury bills, with their near-zero credit risk and high liquidity, became the natural investment of choice. The result is a feedback loop: growing cryptocurrency adoption drives stablecoin issuance, which channels billions into the Treasury market.

The BIS paper meticulously documents this evolution using blockchain-level minting and burning data, tracking the flow of funds from cryptocurrency exchanges into government debt instruments. The correlation between market capitalization changes and on-chain mint/burn activity exceeds 0.99, confirming that stablecoin supply movements directly translate into real-world asset purchases. The broader cryptocurrency market, valued at roughly $3 trillion, feeds into a US Treasury market worth approximately $35 trillion—meaning stablecoins now serve as a meaningful bridge between these two financial ecosystems.

The $270 Billion Reserve Composition Breakdown

As of December 2025, combined stablecoin assets under management surpassed $270 billion, with $153 billion directly invested in US Treasury bills. This reserve pool has grown large enough to surpass the Treasury holdings of several major foreign governments and domestic money market funds, fundamentally altering the demand dynamics for short-term government debt.

USDT, issued by Tether, dominates with a market capitalization of approximately $186 billion. Its reserve portfolio allocates roughly 63% to Treasury bills, with the remainder distributed across money market instruments, commercial paper, and other liquid assets. USDC, issued by Circle, holds a market capitalization of around $72 billion and invests approximately 32% of reserves in T-bills. Together, these two stablecoins account for over 95% of total outstanding stablecoin supply, creating a highly concentrated market structure.

The concentration matters enormously for financial stability analysis. When two entities hold $153 billion in Treasury bills—accumulated rapidly over just a few years—their buying and selling decisions can move markets. The BIS researchers constructed their analytical framework around this reality, measuring how stablecoin flow variations of $1.747 billion (one standard deviation over five-day windows) translate into yield changes. The maximum observed five-day inflow of $11.539 billion and maximum outflow of $4.019 billion illustrate the magnitude of potential market impact during volatile episodes. For more context on how concentrated holdings affect financial markets, see our analysis of financial stability risks.

Measuring Stablecoin Impact on Stablecoins Treasury Yields

The BIS researchers employed a sophisticated local projections framework with instrumental variables to isolate the causal effect of stablecoin flows on Treasury yields. The challenge is significant: stablecoin flows and Treasury yields can both respond to common shocks like risk sentiment or macroeconomic news, making naïve correlations unreliable. Indeed, the paper shows that a simple regression without controls produces an implausibly large estimate of up to 25 basis points of yield compression over 30 days.

To address this endogeneity, the researchers constructed an instrumental variable based on the Bloomberg Galaxy Crypto Index (BGCI), which excludes stablecoins. They purged this index of correlations with traditional financial variables—including equity prices, Treasury yields, the dollar exchange rate, VIX, gold, and oil—using an elastic net machine learning algorithm. The residual captures crypto-specific shocks that drive stablecoin flows without directly affecting Treasury markets through other channels.

The baseline results are striking. A two-standard-deviation stablecoin inflow of $3.5 billion compresses 3-month Treasury bill yields by 2.5 to 3.5 basis points within 10 to 20 days. The effect is concentrated at the 3-month tenor, with limited spillover to 6-month, 1-year, 2-year, or 5-year maturities—consistent with what economists call a “preferred habitat” effect, where demand shocks primarily affect the specific maturity where purchases are concentrated.

The paper also conducts event studies around four crypto-specific shocks to validate the instrumental variable approach: the Terra-Luna crash of May 2022, the FTX collapse of November 2022, the pro-crypto US presidential election of November 2024, and the TRUMP token launch in January 2025. Each event moved stablecoin flows and Treasury yields in the predicted direction while showing minimal correlation with broader financial conditions, strengthening the causal interpretation. The Federal Reserve’s research notes provide additional context on how non-traditional demand sources affect Treasury market functioning.

State-Dependent Effects: Why Treasury Bill Scarcity Matters

Perhaps the most consequential finding in the BIS paper is that the impact of stablecoins on treasury yields is highly state-dependent. The baseline average of 2.5-3.5 basis points masks enormous variation depending on whether Treasury bill supply is ample or scarce. During periods of ample supply, the yield effect is statistically insignificant—essentially zero. But when bills become scarce, the same stablecoin inflow compresses yields by 5 to 8 basis points.

The researchers identify two key scarcity indicators. The first is the Federal Reserve’s overnight reverse repurchase (RRP) facility: when RRP balances are growing, it signals that cash is flowing away from T-bills and toward the Fed’s facility, indicating relative bill scarcity in the market. During these periods, stablecoin purchasing has an amplified impact of approximately 5 basis points. The second indicator is debt ceiling episodes, identified using Google Trends data. When debt ceiling concerns spike (search index above 5), the government temporarily restricts new bill issuance, creating acute scarcity. During these episodes, stablecoin impact reaches 7 to 8 basis points.

This state dependence aligns with established financial theory. When bills are scarce, marginal investors become less price-elastic, meaning additional demand has a disproportionate effect on prices. The BIS paper cites theoretical work by D’Avernas and Vandeweyer showing that T-bill shortages change the composition of marginal buyers, amplifying the price impact of any given demand shock. This framework matters because the conditions that create bill scarcity—Fed tightening, debt ceiling standoffs—often coincide with broader financial stress, meaning stablecoin effects are largest precisely when markets are most vulnerable.

USDT vs USDC: Stablecoins Treasury Yields Impact Compared

The BIS paper decomposes the aggregate yield effect by stablecoin issuer, revealing important differences between USDT and USDC. USDT, the larger and more dominant stablecoin, accounts for approximately 67% of the aggregate yield compression effect, contributing about 2.4 basis points. USDC contributes 21% of the effect, while all other stablecoins combined account for the remaining 12%, slightly exceeding their market share—suggesting smaller issuers may operate with less sophisticated timing of Treasury purchases.

The transparency gap between the two leading issuers is a central concern for regulators. Circle publishes granular CUSIP-level reserve disclosures for USDC, allowing analysts and regulators to identify exactly which Treasury securities are held, their maturities, and their face values. This transparency enhances market predictability and enables more precise risk assessment. Tether, by contrast, provides limited maturity-level information about its USDT reserves, complicating analysis of its potential market impact during stress scenarios.

This asymmetry in disclosure has practical consequences. The BIS researchers note that incomplete maturity disclosures from USDT represent a limitation of their analysis, as they cannot fully map the term structure of Tether’s Treasury holdings. From a financial stability perspective, the opacity of the world’s largest stablecoin issuer—holding over $100 billion in Treasury-related assets—raises legitimate concerns about the adequacy of current oversight mechanisms. The US Treasury Department’s data resources provide context for understanding how stablecoin holdings compare to other investor categories.

Financial Stability Risks From Stablecoin Growth

The BIS paper identifies several financial stability risks stemming from the growing entanglement of stablecoins and Treasury markets. The most pressing concern is fire-sale risk: stablecoins remain fundamentally runnable, meaning holders can redeem their tokens for dollars at any time. Unlike bank deposits, stablecoins lack deposit insurance. Unlike money market funds, stablecoin issuers have no access to the Federal Reserve’s discount window or lender-of-last-resort facilities.

If a major stablecoin issuer faced a severe redemption crisis, it would need to liquidate tens of billions of dollars in Treasury bills rapidly. The BIS researchers emphasize that their estimates likely represent a lower bound of fire-sale effects because the sample period predominantly covers a growing market. During actual stress events, the inability to time sales strategically would amplify price impacts significantly. Moreover, concentrated T-bill positions mean that forced selling could exacerbate market stress precisely when other participants are also seeking liquidity.

The paper also highlights indirect risks through the Treasury basis trade. Stablecoins’ reverse repurchase agreements, backed by Treasury collateral, may facilitate leveraged positions that regulators already view as a first-order systemic concern. Additionally, the growing stablecoin footprint contributes to safe asset scarcity for non-bank financial institutions, potentially affecting the liquidity premium on government securities and the availability of high-quality liquid assets for regulatory purposes. These interconnections mean that a shock originating in cryptocurrency markets could propagate through stablecoin reserves into the heart of the traditional financial system.

Stablecoins and Monetary Policy Transmission

One of the most far-reaching implications of the BIS research concerns monetary policy transmission. If stablecoins continue to grow rapidly, they may interfere with the Federal Reserve’s ability to set short-term interest rates effectively. The paper draws a compelling analogy to what former Fed Chairman Alan Greenspan called his “conundrum” in the early 2000s, when outsized foreign demand for US Treasuries kept long-term yields stubbornly low despite rate hikes.

A stablecoin version of this conundrum could emerge at the short end of the yield curve. If stablecoin issuers become dominant buyers of 3-month Treasury bills, their demand could push short-term rates below the Fed’s intended floor, particularly under the current “ample reserves” operating framework. The Fed addressed a similar challenge with money market funds by granting them access to the overnight reverse repurchase facility. However, stablecoin issuers currently have no such access, creating a potential gap in the monetary policy transmission mechanism.

The researchers note that this risk scales with market size. At current levels of $270 billion, the effects are meaningful but manageable. However, projections of $1.6 to $3.7 trillion by 2030 suggest that stablecoin demand could become a dominant force in short-term Treasury pricing within just a few years. This timeline creates urgency for policymakers to develop frameworks that account for stablecoins as structural participants in government debt markets, rather than treating them as peripheral cryptocurrency artifacts. For a broader perspective on fintech regulatory challenges, explore our overview of global fintech regulation.

Future Projections for Stablecoins and Treasury Markets

The BIS paper’s forward-looking analysis paints a picture of substantially amplified effects as the stablecoin market matures. The Treasury Borrowing Advisory Committee has projected a potential $2 trillion stablecoin market by 2028. Citigroup’s base-case estimate points to $1.6 trillion by 2030, with a bull case reaching $3.7 trillion. These projections imply a tenfold or greater increase from current levels, with proportional scaling of Treasury market effects.

Using the paper’s empirical framework, a $2 trillion stablecoin market would mean a two-standard-deviation inflow of approximately $11 billion. At this scale, the BIS model estimates yield compression of 7.85 to 11 basis points on 3-month Treasury bills—an effect that begins to rival small-scale central bank interventions. During scarcity periods, the impact could be even larger. At Citigroup’s $1.6 trillion base case, the estimated effect ranges from 7 to 9.8 basis points per standard-deviation inflow.

These projections assume that the current linear relationship between stablecoin flows and yield changes holds at larger scales, which the authors acknowledge may not be the case. Market structure could evolve in ways that either amplify or dampen effects. For instance, if stablecoin issuers diversify into longer-term securities, the concentrated short-term impact would diminish. Conversely, if regulatory changes restrict alternative investments, the T-bill concentration could intensify. What seems certain is that the era of treating stablecoins as financially inconsequential is definitively over.

Regulatory Recommendations for Stablecoin Oversight

The BIS research points toward several policy recommendations for managing the growing intersection of stablecoins and treasury yields. First and foremost, the paper argues for standardized reserve reporting requirements. The contrast between USDC’s granular CUSIP-level disclosures and USDT’s limited transparency highlights the need for regulatory mandates that bring all issuers to a common standard. Without consistent reporting, regulators cannot adequately assess concentration risks or model potential fire-sale scenarios.

Second, the paper raises the question of whether stablecoin issuers should be granted access to Federal Reserve facilities. Currently, these entities hold hundreds of billions in Treasury-adjacent assets but operate entirely outside the central bank safety net. Providing standing repo or reverse repo access could mitigate fire-sale risks and improve monetary policy transmission, but it would also extend the public safety net to entities that some regulators view as inadequately supervised. The Financial Stability Board’s high-level recommendations offer an international framework for approaching these challenges.

Third, the BIS findings support the case for equity and liquidity buffers at stablecoin issuers, similar to those required of banks and money market funds. Such buffers would provide a cushion during redemption stress, reducing the likelihood of forced Treasury liquidations that could amplify market volatility. The paper’s empirical evidence that stablecoin effects are largest during periods of existing market stress makes this recommendation particularly urgent.

Finally, the research underscores the need for coordinated international oversight. Tether is incorporated in the British Virgin Islands, Circle operates primarily under US jurisdiction, and stablecoins trade globally around the clock. No single regulator can fully oversee the systemic risks that emerge when $270 billion in quasi-sovereign debt holdings operates across borders with varying levels of transparency. The BIS, as the central bank of central banks, is well positioned to facilitate this coordination, and Working Paper 1270 represents an important step in building the empirical foundation for evidence-based regulation.