Stablecoins as financial infrastructure

From DeFi tool to global rails

Module 9 covered stablecoins as a crypto product — three categories, the major players, what makes each safe or fragile. That framing is correct but incomplete. To understand where the category is actually heading, you have to look at stablecoins through a different lens: as financial infrastructure used by entities that have nothing to do with crypto.

The shift has been gradual and is now obvious to anyone watching the data. Stablecoins are competing with — and beating — traditional payment rails in specific use cases. They are infrastructure now, not a niche.

This module is the framework for that shift.

The scale that surprised most people

Stablecoin transaction volume crossed PayPal's monthly volume in late 2023 and has not looked back. By 2026, stablecoins are processing tens of trillions in annual transaction value globally — approaching Visa's network volume in some months.

This is not just crypto-on-crypto trading. The actual flows include:

Cross-border B2B payments. Companies in emerging markets settling with US suppliers in USDC or USDT to avoid multi-day SWIFT settlement and correspondent banking fees. A growing percentage of international trade settlement in some corridors flows through stablecoins.

Remittances. Workers sending money home through stablecoin rails rather than Western Union or local money transfer services. The cost differential can be 5-10% or more on the same flow.

Dollar-denominated savings in emerging markets. Households in inflationary economies holding USDC or USDT through local exchanges, accessing dollar-denominated value that local banking cannot reliably provide. Argentina, Nigeria, Turkey, Venezuela, Lebanon — the pattern repeats in every country with currency instability.

Corporate treasury. Companies holding portions of operating cash in stablecoins for transactional flexibility (instant 24/7 settlement) and yield (~5% on tokenized treasury-backed stablecoins).

DeFi and trading. Still meaningful but increasingly a smaller fraction of total volume as the non-crypto use cases scale.

Why stablecoins beat SWIFT

The technical comparison favors stablecoins so heavily it is sometimes hard to take seriously. Consider a $100,000 cross-border B2B payment:

SWIFT + correspondent banking: 1-5 business days. Fees of $25-100 (often more, depending on the corridor). Limited to business hours. Multiple intermediary banks taking custody temporarily. Requires bank accounts on both ends.

USDC on Ethereum L2: 5-10 seconds. Fees of pennies. 24/7. No intermediaries. Wallet addresses on both ends.

For B2B payments at scale, the operational difference is enormous. Companies actually doing meaningful cross-border activity are quietly moving large portions of their flows onto stablecoin rails. Most do not advertise it. The accountants and treasurers notice.

This is why JPMorgan launched Onyx (their internal blockchain payment system) years ago. Why Citi has been quietly working on tokenized deposit systems. Why BNY Mellon — the largest custodian bank in the world — has built crypto custody operations.

The traditional financial system is not ignoring this. It is actively integrating, slowly enough not to disrupt existing revenue but fast enough not to be left behind.

The regulatory framework is converging

The regulatory landscape that defined stablecoins through 2023 was fragmented and uncertain. By 2026 it has substantially clarified.

US GENIUS Act (2025). First federal US framework for payment stablecoins. Establishes reserve requirements (1:1 backing in cash and short-term Treasuries), audit requirements, and operational standards. Defines which entities can issue payment stablecoins and on what terms. Creates regulatory certainty for major issuers.

EU MiCA (2024). Markets in Crypto-Assets Regulation. Comprehensive crypto framework with specific stablecoin provisions. Reserve, transparency, and authorization requirements. Created clear pathways for compliant stablecoins (Circle's USDC, others) and restricted operations of non-compliant ones in EU markets.

UK, Singapore, Hong Kong, UAE frameworks. Each major jurisdiction has implemented or is implementing similar frameworks. The result is a global regulatory landscape where the major stablecoins (those operated by transparent, well-capitalized issuers) can operate compliantly across most major markets.

The losers in this framework are the smaller, opaque, or under-regulated stablecoins. Several smaller dollar-pegged tokens have lost market share as institutions only use stablecoins that comply with the new frameworks.

The winners are USDC (Circle, US-regulated, MiCA-compliant), USDT (Tether, growing institutional acceptance despite historical opacity), PayPal USD (regulated US issuer), and emerging tokenized bank deposit products from major banks.

The market structure in 2026

Tether (USDT). Still the largest by volume and circulation. Dominates emerging-market adoption and crypto trading. Operates from El Salvador with multi-jurisdictional licensing. Quarterly reserve attestations now standard.

Circle (USDC). Second-largest by volume, increasingly dominant in institutional and DeFi contexts. Most-compliant from a US perspective. The default stablecoin for major DeFi protocols and institutional flows.

PayPal USD (PYUSD). Launched 2023, growing in US consumer payments. PayPal's distribution and brand make it accessible to traditional finance users.

DAI (Sky). The leading decentralized stablecoin. Smaller than USDC and USDT but durable. The choice when minimizing trust in any centralized issuer matters.

Tokenized bank deposits. Several major banks have launched or are launching tokenized deposit products — JPMorgan, BNY Mellon, others. These represent on-chain claims on actual bank deposits, with the trust assumption of the bank rather than a stablecoin issuer.

Central Bank Digital Currencies (CBDCs). Most major central banks are exploring or piloting CBDCs. China's digital yuan is the largest in production. The EU and US are in earlier stages. CBDCs are a separate category — government-issued digital money — but operate on similar infrastructure and may compete with private stablecoins in some markets.

The institutional shift

The most important shift in 2025-2026 is institutional engagement with stablecoins as serious payment infrastructure.

Several specific developments:

Visa and Mastercard stablecoin integration. Both major card networks have built stablecoin settlement capabilities. Merchants can choose to receive stablecoins for card transactions, with the network handling the conversion at the consumer level.

Major banks issuing tokenized deposits. JPMorgan's Onyx coin has been operating for years and is increasingly integrated with external systems. Citi, BNY Mellon, and others have similar initiatives. These are bank-issued tokens that interact with the broader stablecoin infrastructure.

Stablecoins in B2B trade finance. Major commodity trading firms (oil, agriculture, metals) routing settlement flows through stablecoins. The cost and speed advantages over correspondent banking are too large to ignore for high-volume traders.

Stablecoins in remittance corridors. Major remittance companies (Wise, Western Union, Remitly) have built stablecoin settlement layers underneath their consumer products. Users may not see the stablecoin layer; the cost savings flow through to lower fees.

Yields on stablecoin holdings. Tokenized treasury-backed stablecoins (BUIDL, Ondo OUSG) offer yields of 4-5% on stablecoin balances. This is structurally competitive with money market funds and has attracted significant institutional capital.

Each of these shifts represents serious capital flow into stablecoin infrastructure. None depends on speculation or hype. All depend on stablecoins solving real operational problems better than alternatives.

What this means for the broader thesis

Stablecoins are the bridge between traditional finance and crypto-native infrastructure. They are the first crypto product to achieve genuine mainstream usage measured in trillions of dollars annually.

This matters for several reasons:

Stablecoin demand drives demand for the underlying blockchain infrastructure. USDC on Ethereum requires Ethereum gas. USDT on Tron requires TRX. As stablecoin volume scales, the supporting blockchain networks accrue more economic activity. This is one of the cleanest drivers of base-protocol value.

Stablecoins anchor the institutional adoption thesis in something concrete. When asked "what will institutions actually use crypto for," stablecoins are an easier answer than abstract claims about Bitcoin replacing gold. Companies are already using them. Banks are already integrating with them.

Stablecoins are competing with traditional payment infrastructure on real margin. The fee differential between stablecoin and SWIFT settlement is too large for major flows to ignore indefinitely. The structural advantage will continue to drive adoption.

For users and investors, the practical implications:

Stablecoins are durable infrastructure. The major stablecoins (USDC, USDT, DAI) are highly likely to continue operating at scale through any reasonable scenario. They are not speculative bets; they are utility holdings.

The blockchains that host meaningful stablecoin activity are the durable bases. Ethereum (USDC, USDT, DAI). Tron (USDT). Solana (USDC). These chains have meaningful, non-speculative economic activity that is unlikely to disappear.

Tokenized treasuries on top of stablecoin infrastructure are a real yield opportunity. 4-5% in BUIDL, OUSG, or similar products is durable yield from US Treasury exposure with on-chain settlement benefits.

The practical takeaway

Stablecoins started as a crypto product. They have become global financial infrastructure. The shift is one of the most important capital flow stories of the decade and is unlikely to reverse.

For everyday use: keep stablecoin balances diversified across major issuers (USDC, USDT, possibly DAI) to mitigate issuer-specific risk. Use the major stablecoins on the major chains (Ethereum mainnet, Ethereum L2s, Tron, Solana) where liquidity is deepest.

For investors: stablecoin infrastructure plays — including the chains that host meaningful stablecoin activity and the tokenized treasury products built on stablecoin rails — are among the cleanest exposures to the institutional crypto adoption thesis.

The next module looks at Digital Asset Treasury Companies (DATs) and spot Bitcoin ETFs — two structural vehicles that have moved hundreds of billions of dollars into Bitcoin since 2020, and that continue to shape institutional flow into the asset class.