The stablecoin market now sits at roughly $317 billion in total market capitalization, with Tether's USDT accounting for approximately $187 billion and Circle's USDC holding about $75.7 billion more. Over 97% of all stablecoins are pegged to the U.S. dollar. According to a January 2026 analysis by Ben Marsh of Sei Labs, anyone holding or transacting in those assets is not just using a convenient payment tool. They are importing the Federal Reserve's interest rate cycles, inflation dynamics, and monetary constraints directly into their local economy. Sei Labs is the developer of the Sei blockchain network, which competes for stablecoin transaction volume.

Marsh identifies three mechanisms through which this transmission occurs. First, when commerce is invoiced in dollar stablecoins, local consumer price inflation begins tracking U.S. CPI rather than domestic conditions. Second, households that park savings in yield-bearing stablecoins (such as tokens backed by U.S. Treasury bills) create pressure on domestic interest rates, a dynamic Marsh terms "digital Uncovered Interest Parity": local central banks must offer competitive yields or watch capital leave. Third, even on-chain transaction fees carry a dollar-denominated opportunity cost tied to U.S. short-term rates, because capital sitting idle while waiting for block confirmation has an implied cost set by the Fed.

"In a world of frictionless dollar rails, using stables means using the Fed's balance sheet as your own," Marsh wrote in the post.

The paper extends a concept in international economics called the "impossible trinity" (which holds that a country cannot simultaneously maintain monetary independence, exchange rate stability, and capital account openness) into what Marsh calls an "impossible quartet." He adds a fourth constraint: banking sector stability. Deposit flight from local banks into yield-bearing stablecoins shrinks domestic lending, widens credit spreads, and generates cost-push inflation through tighter credit conditions. Countries also lose seigniorage revenue (the fiscal benefit derived from issuing currency) as residents abandon local money for digital dollars. Marsh's conclusion is blunt: nations must either build institutional buffers (such as capital controls, tax asymmetries, or CBDCs) or accept that digital openness means conceding monetary policy to Washington.

That concern is not limited to academic circles. Federal Reserve Governor Christopher Miran flagged the issue in a November 2025 speech, warning that widespread stablecoin adoption could become "a multitrillion dollar elephant in the room for central bankers." IMF staff separately warned, in a December 2025 blog post, that stablecoin adoption "decreases a country's central bank ability to control its monetary policy and serve as lender of last resort."

The IMF's December 2025 departmental paper on stablecoins added that these assets can bypass capital-flow management systems, hampering monitoring and weakening crisis response capacity.

Economist Hélène Rey, writing in IMF Finance and Development in September 2025, raised the possibility that dollar stablecoin proliferation could entrench a new form of U.S. monetary imperialism at a global scale. The underlying transmission mechanism is not historically novel. Fed tightening in the 1970s and 1980s propagated through Eurodollar markets and triggered debt crises across Latin America, Sub-Saharan Africa, and Asia. The dynamics Marsh describes are the same in structure, only technologically accelerated.

The regional exposure is most acute where monetary sovereignty is already fragile. In Sub-Saharan Africa, stablecoins account for roughly 43% of all crypto transaction volume. Yet approximately 90% of those transactions remain tied to crypto trading rather than commerce, with only around 6% used for goods and services, meaning the dollarization effects the Sei paper describes are expected to intensify as commercial adoption grows rather than being fully realized today. In Nigeria and South Africa, approximately 80% of surveyed crypto users hold dollar-pegged stablecoins, and about 95% of Nigerian respondents in one survey said they prefer receiving payments in stablecoins over the naira. The naira lost more than 70% of its value against the dollar across 2023 and 2024, making dollar savings a rational household decision. That rationality is further driven by genuine utility: a Mercy Corps Ventures pilot in Kenya found that stablecoin rails reduced remittance fees from 29% to just 2% on five-dollar micropayments. The Sei paper's contribution is showing that this rational, utility-driven adoption collectively undermines the Central Bank of Nigeria's capacity to run independent monetary policy.

South Asia presents a parallel picture. India ranked first globally in Chainalysis's 2025 Crypto Adoption Index, and the broader South Asia region posted an 80% year-on-year increase in crypto activity with roughly $300 billion in transaction volume through mid-2025. The Reserve Bank of India warned explicitly in its 2024 annual report about the risk of "rupee dollarisation." India is responding: the e-rupee CBDC saw a 334% increase in circulation by March 2025, and a rupee-backed stablecoin was expected to launch in Q1 2026. The dollarization concern for this region is also partially qualified by user behavior: 45% of South Asian stablecoin holders convert their holdings back to local currency immediately or within days of receiving funds, compared to only 17% of users in Europe. This pattern suggests that many South Asian users are routing through dollar stablecoins for transaction efficiency rather than accumulating dollar savings over the long term.

Pakistan, ranked third in global crypto adoption, has neither a deployed CBDC nor a local-currency stablecoin to counterbalance the dynamic. Pakistan receives approximately $27 billion annually in remittances, making it structurally exposed to both the currency substitution and blockspace channels the Sei paper describes, and the absence of any domestic digital alternative leaves its monetary system with little insulation.

The structural linkages run deep on the U.S. side as well. Tether and Circle together held an estimated $187 to $197 billion in U.S. Treasury bonds as of late 2025, making the two companies larger creditors of the U.S. government than Saudi Arabia, the UAE, or South Korea. The GENIUS Act, signed into law in July 2025, codifies this arrangement by requiring stablecoin issuers to hold one-to-one dollar reserve backing in U.S. Treasuries and equivalent short-term dollar instruments, and explicitly frames the legislation as a tool for preserving dollar reserve currency status.

With Citibank projecting the stablecoin market could reach $2 trillion by 2030 and 56% of current holders planning to expand their usage this year, the window for emerging markets to build credible domestic alternatives is narrowing.