The Role of Stablecoins in Cryptocurrency Markets

Stablecoins are the cash layer of crypto markets

Stablecoins have moved from a trader convenience to the core balance sheet of the crypto economy. As of March 2026, DefiLlama showed roughly $313 billion in stablecoins outstanding, with USDT at about $186.7 billion and USDC at about $73.3 billion. That means the two largest issuers alone account for about 83.1% of the market. Concentration at that level matters because most crypto liquidity, collateral valuation, and settlement activity now rest on a very small number of private dollar liabilities.

Stablecoin infrastructure is also geographically concentrated onchain. DefiLlama’s chain data showed Ethereum with 51.7% of stablecoin supply, while Tron held roughly $84.8 billion, or about 27.1% of the total. On Tron, USDT represented about 98.35% of stablecoin supply. In practice, that means a large share of crypto’s “cash” is running through two base layers and, on one of them, through a single issuer almost exclusively.

The dominant role of stablecoins is still market plumbing, not retail commerce. The Bank of England said on November 10, 2025 that the predominant use of stablecoins today remains “the buying and selling of cryptoassets.” That is the right baseline. Stablecoins are first a settlement asset for exchanges, market makers, OTC desks, and DeFi protocols. Payments growth is real, but it sits on top of a market structure still built around trading liquidity.

Stablecoins are expanding beyond trading, but unevenly

Stablecoins are increasingly used outside speculative trading, especially where users need dollar access, fast settlement, or a hedge against local currency weakness. Visa said in 2025 that stablecoin supply was approaching $250 billion and that there were 47 million monthly active stablecoin users across chains. Chainalysis also highlighted remittances, dollar access via stablecoins, and mobile-first finance as important adoption drivers in emerging markets. That is economically credible. A dollar token that settles continuously and is easier to move than bank wires has obvious product-market fit in places where banking rails are expensive, slow, or politically constrained.

Payments are growing, but the evidence still points to a sector in transition rather than one that has fully escaped crypto-native demand. Artemis reported that 31 payment firms settled more than $94.2 billion in stablecoin payments between January 2023 and February 2025. That is meaningful. It is also still small relative to exchange settlement and collateral flows. The practical implication is that the “payments” narrative should be taken seriously, but not used to erase the fact that the market remains finance-first.

Stablecoins also underpin onchain credit markets. Visa’s 2025 lending report said stablecoin-denominated loans originated over the prior five years exceeded $670 billion, and monthly stablecoin borrowing reached $51.7 billion in August 2025. This is one of the clearest examples of stablecoins doing something economically distinct from volatile crypto assets. They provide the unit of account and settlement asset that lets DeFi lending function like a continuously open money market rather than a pure collateral casino.

The real business model is reserve yield

Fiat-backed stablecoins are not just payment products. They are reserve management businesses funded by non-interest-bearing liabilities. Circle says USDC is backed 100% by highly liquid cash and cash-equivalent assets, that the majority of reserves sit in the Circle Reserve Fund, an SEC-registered Rule 2a-7 government money market fund, and that a Big Four firm provides monthly third-party assurance. In Circle’s 2025 Form 10-K, reserve income represented 96.0% of total revenue from continuing operations. From a TradFi lens, that is the story: stablecoin issuance creates float, float is invested in short-duration safe assets, and the issuer captures the carry.

Tether’s disclosures point in the same direction, only at larger scale. Tether said its total exposure to U.S. Treasuries rose to $141.6 billion in the fourth quarter of 2025. Whether one prefers Tether’s disclosure model or Circle’s, the economic structure is similar. Users hold a tokenized dollar claim. Issuers hold reserves. The spread between reserve yield and token-holder yield is the business model.

Stablecoin growth now matters to traditional funding markets. A BIS working paper said stablecoins purchased $40 billion of U.S. Treasury bills in 2024, an amount comparable to the largest U.S. government money market funds and larger than most foreign purchases. The same paper found that large inflows into stablecoins can lower three-month T-bill yields. This is the point where stablecoins stop being a subculture curiosity. They become a marginal buyer in sovereign short-duration markets.

The value-flow implication is straightforward. Stablecoins deliver obvious utility to users, but the cash flow is disproportionately captured by issuers and distribution partners. The narrative says “digital dollars for everyone.” The financial substance says “private issuers monetizing balance-sheet scale.” Those two things can coexist, but they should not be confused. Circle’s revenue mix makes that visible in a way the market sometimes prefers not to discuss.

Not all stablecoins deserve to be analyzed together

Stablecoins are a category label, not a single risk class. The right way to analyze them is by backing structure, redemption design, and who ultimately absorbs stress.

Algorithmic stablecoins are the weakest category from a financial-fundamentals perspective. The Richmond Fed’s review of Terra’s collapse made the problem clear: UST was backed by LUNA, but LUNA’s value depended on confidence in the convertibility structure itself. Once liquidity and confidence disappeared, the system had to defend both tokens at once and could not. That is not a cash equivalent. It is a leveraged monetary experiment.

Crypto-collateralized stablecoins remain relevant because they offer properties fiat-backed issuers do not, especially greater onchain transparency and less direct dependence on one banking perimeter. But they pay for that with lower capital efficiency and more fragile collateral dynamics. Fiat-backed issuers win on scale because Treasury bills are cheaper collateral than overcollateralized crypto, and because redemption certainty matters more than ideology once meaningful capital is involved.

Peg stability is a liquidity problem before it is a branding problem

A stablecoin peg holds when users trust that redemption works under stress. That trust depends on reserve quality, legal claim, banking access, and market-making depth. Circle’s own S-1 described how Silicon Valley Bank failed to honor Circle’s request to withdraw $3.3 billion in March 2023, about 8% of USDC reserves at the time, and how the secondary-market price of USDC temporarily fell below $1 as weekend banking closures impaired primary liquidity. The lesson was not that USDC lacked assets. The lesson was that timing, access, and redemption rails matter as much as reserve quantity.

That episode is also why stablecoins should be analyzed more like narrow funding vehicles than like ordinary tokens. The market does not wait for monthly attestations during a run. It prices expected liquidity. A stablecoin can be solvent in an accounting sense and still depeg if redemptions, banking rails, or secondary liquidity cannot absorb stress quickly enough. That is a classic maturity-and-liquidity problem in new packaging.

Regulation is forcing stablecoins toward money-market discipline

Stablecoin regulation is no longer theoretical. In the European Union, MiCA created a harmonized framework that distinguishes asset-referenced tokens from e-money tokens, with e-money tokens explicitly tied to one fiat currency and intended primarily as a means of payment. In the United States, the GENIUS Act was signed into law on July 18, 2025. The White House said the law requires 100% reserve backing with liquid assets such as U.S. dollars or short-term Treasuries and requires monthly public reserve disclosures. Whatever one thinks of the politics, the market direction is clear: more disclosure, tighter reserve rules, clearer redemption rights, and heavier AML obligations.

The regulatory direction is also converging internationally around the idea that stablecoins used as money need money-like safeguards. The Bank of England’s November 2025 consultation proposed that systemic sterling stablecoins should always redeem at par, hold at least 40% backing in unremunerated central bank deposits, and hold the remainder mainly in short-term government debt, with possible central bank liquidity backstops. That is not crypto exceptionalism. It is classic prudential logic applied to tokenized liabilities.

Even with progress, the rulebook is not settled globally. The FSB said in October 2025 that implementation of stablecoin frameworks remained incomplete, uneven, and inconsistent across jurisdictions, and that regulation of global stablecoin arrangements was lagging. That matters because stablecoins are inherently cross-border instruments. A stablecoin can be issued in one jurisdiction, reserve-managed in another, traded globally, and used on permissionless networks everywhere. Fragmented regulation is therefore not a side issue. It is part of the asset’s risk profile.

Regulators are also focused on financial crime. FATF said on March 3, 2026 that more than 250 stablecoins were in circulation by mid-2025 and cited Chainalysis data showing stablecoins accounted for 84% of illicit virtual asset transaction volume in 2025, often involving unhosted wallets. That does not negate legitimate usage. It does mean compliance features, issuer controls, and blacklist authority are not peripheral design choices. They are now central to whether a stablecoin can scale institutionally.

What this means for token economy design

Stablecoin choice is a treasury architecture decision, not a cosmetic UI decision. If a protocol takes fees in USDT, posts collateral in USDC, or offers stablecoin-denominated yield, it inherits the banking dependencies, legal perimeter, blacklist rules, reserve composition, and redemption mechanics of that asset. Those are balance-sheet exposures. They should be analyzed with the same seriousness as smart contract risk or token supply design.

At FinDaS Tokenomics, we treat stablecoin selection in token economy design as a value-flow problem first. A protocol that relies on fiat-backed stablecoins may gain liquidity, tighter spreads, and institutional familiarity, but it also routes part of its monetary base through private issuers that capture reserve economics. A protocol that prefers crypto-backed stablecoins may gain some autonomy, but usually at the cost of capital efficiency and scale. There is no neutral option. There is only a choice about which balance sheet your system wants to depend on.

The role of stablecoins in cryptocurrency markets is therefore more concrete than most narratives suggest. Stablecoins are the settlement asset, the collateral base, the unit of account for large parts of DeFi, and an increasingly important bridge into remittances and payments. But they are also privately issued short-duration balance sheets with concentrated market power, regulatory dependencies, and clear revenue capture at the issuer layer. The sector’s future will be decided less by branding and more by who can combine redemption reliability, compliant distribution, and durable reserve economics at scale.