This article analyzes the structural crisis behind Circle's (USDC) surge in scale. Although USDC's supply has reached $75.3 billion and is growing rapidly, its revenue remains heavily dependent on reserve interest income (accounting for approximately 80%), exposing it to significant revenue contraction risks amid the Federal Reserve's interest rate cut cycle.

Article author, source: CoinFound

TAKEAWAY

• Scale has surged: USDC supply increased 72% year-over-year to $75.3 billion, with on-chain transaction volume reaching $11.9 trillion in Q4 (up 247% YoY), marking the second consecutive year of faster growth than USDT and solidifying its place in mainstream payment infrastructure (Source: Circle Q4 2025 Earnings Report, February 2026)
• Revenue engine is highly vulnerable: In Circle’s full-year 2025 revenue of $2.7 billion, interest income from reserves accounted for approximately 80%; as the Federal Reserve is expected to continue cutting rates in 2026, each 100-basis-point decline in interest rates could result in a structural revenue compression of $800 million to $1 billion for Circle.
• The regulatory grace period is extremely limited: the CLARITY Act draft explicitly proposes banning stablecoins from paying interest to holders; Circle’s stock (CRCL) plunged approximately 20% in a single day (source: Blockhead, March 26, 2026), and the current compliance differentiation advantage may be forcibly eliminated at the legislative level.
• COINFOUND perspective: The mainstream narrative focuses on growth rates and stock price doubling, but what truly deserves questioning is whether Circle’s moat lies in brand scale or in a time window dependent on high interest rates and regulatory arbitrage—the latter is narrowing at a visibly accelerating pace.
• The competitive landscape is rapidly deteriorating: PayPal, Ripple, JPMorgan, State Street, and BNY Mellon have all launched or announced plans for stablecoins or deposit coins; Circle’s institutional advantages will face direct pressure from traditional financial institutions within 18 months.
• Stock signal alerts: Mizuho analysts upgraded their rating from "Underperform" to "Neutral" while explicitly warning that "it's still a crypto rollercoaster"; Circle's stock, which doubled in a month, dropped 26% in a single week, and valuation disparities remain unresolved (Source: CoinDesk, 2026-01-29)

Core argument

Behind Circle's $75.3 billion lies a more important issue.

With a 72% annual growth rate in USDC supply and quarterly trading volume reaching $11.9 trillion, the digital metrics are indisputable—this marks a defining milestone for stablecoins entering mainstream financial infrastructure. Yet, the same narrative that propelled Circle’s stock to double in one month is diverting investor attention from two structural risks: the dual time windows of interest rate sensitivity and regulatory windfalls. This article seeks to answer the core question: When the Fed’s rate-cut cycle begins and the CLARITY legislation takes effect, what remains of Circle’s business model?

The scale miracle of USDC is real, but the danger lies in Circle's revenue engine being built on a narrowing window of interest rates and regulation.

Event background

Circle released its Q4 2025 and full-year financial results on February 25, 2026: USDC’s circulating supply increased 72% year-over-year to $75.3 billion at year-end; Q4 on-chain transaction volume reached $1.19 trillion, up 247% year-over-year, marking the second consecutive year of growth outpacing USDT (source: Circle Q4 2025 Earnings Report, Feb 2026). Full-year revenue was $2.7 billion, up 64% year-over-year; Q4 revenue alone was $770 million, up 77% year-over-year. Following the earnings release, Circle’s stock (CRCL) more than doubled in price within approximately one month; Bernstein analysts predicted in early March an additional 60% upside potential, primarily driven by expanding stablecoin adoption and integration with AI payments (source: CoinDesk, March 10, 2026).

However, the market's one-sided narrative was disrupted on March 26. On that day, Circle's stock price plunged approximately 20% in a single day, driven by provisions in the CLARITY Act draft that prohibit stablecoins from paying interest, compounded by macroeconomic interest rate expectations (Source: Blockhead, 2026-03-26). Meanwhile, regulatory scrutiny from the OCC and the Bank for International Settlements (BIS) on the expansion of USDC has significantly intensified, with regulators formally including USDC in discussions on systemically important financial instruments for the first time (Source: Yahoo Finance, 2026-02).

Is this company, dubbed by capital markets as "the most boring but hottest crypto trade," truly navigating a long-term structural growth cycle, or is it exploiting an arbitrage opportunity that’s about to close?

In-depth analysis

1. Structural Drivers—Why This Is Happening

The expansion of USDC reflects not only competition for market share in the stablecoin sector, but also the combined benefits of favorable U.S. interest rate conditions and enhanced regulatory compliance.

From 2022 to 2025, the Federal Reserve’s interest rate hiking cycle pushed the federal funds rate to a high of 5.25%-5.5%. Circle allocated its USDC reserve assets into U.S. short-term Treasury securities and money market funds, making reserve interest income the dominant component of the company’s revenue. In Circle’s full-year 2025 revenue of $2.7 billion, reserve interest accounted for approximately 80% (source: Circle Q4 2025 earnings report, February 2026). The core logic of this business model is straightforward: the larger the USDC supply, the greater the corresponding reserve size, and the more substantial the interest income generated in a high-interest-rate environment.

Meanwhile, USDC’s first-mover advantage in regulatory transparency—its rigorous reserve audit mechanisms and proactive adherence to compliance frameworks—has made it the preferred choice for institutional clients and traditional payment scenarios as regulatory environments in Europe and the U.S. tighten. Following regulatory restrictions under frameworks like MiCA in Europe and the U.S., USDC has filled this gap, driving a structural expansion in its supply.

Although Circle’s growth figures are impressive, its business model has a fundamental vulnerability: revenue is highly correlated with interest rates. The Federal Reserve has clearly entered an interest rate cutting cycle, and institutional forecasts suggest the benchmark rate could fall to the 3.5%-4% range by the end of 2026. Estimating a linear relationship between reserve size and interest rates, each 100-basis-point decline would reduce Circle’s reserve income by approximately $800 million to $1 billion—meaning nearly 30% of its current revenue is at direct risk of evaporating.

Circle's remarkable growth occurred precisely during the final window of high interest rates. Now that this window is closing, can Circle's growth logic sustain itself?

2. Broader Impact—What This Will Accomplish

The most materially impactful variable currently is the clause in the CLARITY Act draft that prohibits stablecoins from paying interest to holders. If this clause is enacted in nearly literal form, it would legally eliminate USDC’s regulatory differentiation advantage over other stablecoins and force Circle to accelerate its shift toward lower-margin businesses such as transaction fees, API services, and enterprise customization. Circle’s stock drop of approximately 20% on March 26 reflected the market’s immediate pricing of a literal interpretation of this clause; however, what the market has not yet fully priced in is that the time cost of this transition may coincide with the pace of declining interest rates—creating a true “double hit” scenario.

For exchanges, the short-term abundance of USDC liquidity will not change, but platforms whose primary income source is the interest on USDC reserves—including certain CeFi products—will face yield compression.

Competitive landscape (medium-term: 6–18 months): PayPal (PYUSD), Ripple (RLUSD), JPMorgan, State Street, and BNY Mellon have all announced or are advancing plans for stablecoins or deposit coins. These institutions possess inherent regulatory compliance credentials, extensive enterprise customer bases, and comprehensive regulatory relationship networks, which will exert substantial institutional-level competitive pressure on Circle. Circle’s moat, built on its first-mover advantage in regulatory compliance, will be significantly weakened given that traditional financial institutions are themselves the architects of regulatory compliance standards.

For DeFi protocols, USDC short-term liquidity will remain ample; however, if protocols overly rely on USDC reserve yields as a source of protocol incentives during a declining interest rate cycle, they will face dual pressures: compressed TVL yields and liquidity migration toward competing stablecoins.

All of this ultimately comes down to one conclusion: the growth in USDC's scale is real and structurally significant, but Circle's revenue engine is built on a narrowing window of interest rates and regulation, and current market pricing systematically underestimates this structural risk.

[COINFOUND Perspective]

COINFOUND is an in-depth research platform for institutional investors and high-net-worth individuals in the crypto market, with a core value proposition of "Contrarian, Data-Driven, Actionable." We do not track market sentiment; instead, we identify structural turning points and provide actionable insights before mainstream narratives shift.

The prevailing view is that USDC’s supply surpassing $75.3 billion and growing faster than USDT represents the strongest evidence yet of the arrival of the stablecoin infrastructure era, making Circle (CRCL) the most compelling crypto infrastructure asset to position for this cycle.

But we believe the real issue is that the market is pricing in "scale" without pricing in the sustainability of the revenue model—yet this is the very foundation upon which Circle’s valuation rests.

Our assessment is based on three factors: Circle’s revenue structure, which is highly dependent on interest rates—with reserve interest accounting for approximately 80%—exposes it to systemic margin compression during rate-cut cycles; the potential enactment of the CLARITY Act草案 would legally eliminate Circle’s regulatory advantages over competitors; and the mass entry of traditional financial institutions into the stablecoin space poses a direct threat to Circle’s institutional moat within 18 months.

If this assessment holds, Circle’s next critical move will be to accelerate the commercialization of the Arc blockchain and the monetization of its enterprise API services before the interest rate window closes entirely, shifting its revenue sources from reserve interest to transaction infrastructure. Whether this transition can be completed within the time window is the true gamble for CRCL’s valuation—and the most critical data point to watch in the next quarter’s earnings report.

Risk Disclaimer

The greatest uncertainty in this assessment lies in the pace of the Fed’s rate cuts: if inflation rebounds more than expected, causing a delay in the rate-cut path, the pressure on Circle’s reserve income will also be delayed, requiring an adjustment to the timing window of the main thesis.

The limitation of this analytical framework is that there is insufficient public data to support the pace of monetization of Arc blockchain and enterprise API services within Circle, leading to significant uncertainty regarding the actual rate of revenue diversification; the analysis conclusions rely on extrapolations from currently disclosed information.

Readers should pay additional attention to the following counter-signals: if the final version of the CLARITY Act substantially exempts stablecoin yield provisions, or if Circle discloses in its Q2 2026 earnings report that non-interest income has significantly increased (exceeding 20%), then the current analytical framework needs to be reassessed.

This is for informational and analytical purposes only and does not constitute investment advice.

References

[1] Circle. "Q4 and Full-Year 2025 Earnings Report." Circle Official / PYMNTS. 2026-02-25. https://www.pymnts.com/earnings/2026/circle-bets-on-2026-growth-after-stablecoin-transactions-skyrocket-247percent/

[2] CoinDesk Markets. "Circle is up 100% in a month: Why this boring stablecoin is suddenly the hottest trade in crypto." CoinDesk. 2026-03-16. https://www.coindesk.com/markets/2026/03/16/circle-is-up-100-in-a-month-why-this-boring-stablecoin-is-suddenly-the-hottest-trade-in-crypto

[3] Blockhead. "Circle's 20% Collapse: Three Shocks in One Session Expose Stablecoin Regulation Risk." Blockhead. 2026-03-26. https://www.blockhead.co/2026/03/26/circles-20-collapse-three-shocks-in-one-session-expose-stablecoin-regulation-risk/

[4] CoinDesk. "Circle's Biggest Bear Just Threw in the Towel, but Warns Stock Is Still a Crypto Roller Coaster." CoinDesk. 2026-01-29. https://www.coindesk.com/markets/2026/01/29/circle-s-biggest-bear-just-threw-in-the-towel-but-warns-the-stock-is-still-a-crypto-roller-coaster

[5] Yahoo Finance. "Circle's USDC Growth Meets New Scrutiny From OCC and BIS." Yahoo Finance. 2026-02. https://finance.yahoo.com/news/circle-usdc-growth-meets-scrutiny-231731096.html