Stablecoins Face the Scale Test

Growing adoption is bringing a harder question into focus: what does private digital money need to work reliably at financial-system scale?

Stablecoin adoption is becoming increasingly difficult to dismiss as a purely crypto-native phenomenon.

They are being used for cross-border settlement, treasury movement, digital commerce and card-funded spending. Infrastructure around issuance, custody, wallets, liquidity and fiat conversion has become considerably more mature.

The latest numbers point in the same direction. Stablecoin card spending reportedly exceeded $1 billion during July, while providers expect substantial further growth as stablecoin balances become easier to connect with ordinary merchant acceptance.

At the same time, the institutional debate is becoming more demanding.

Speaking at Jackson Hole on 28 August, BIS General Manager Pablo Hernández de Cos argued that stablecoins in their current form do not yet provide the properties required of money operating at scale. His concerns include interoperability, liquidity, consistent AML controls and the preservation of a common monetary system.

This creates a useful moment for the market.

Stablecoins have already demonstrated that they can move value.

The next test is whether the surrounding architecture can support them when the amounts, users and systemic importance become much larger.

Adoption is becoming more commercial

Stablecoin growth was initially driven largely by crypto trading.

That remains an important use case, but it is no longer the whole market.

Businesses increasingly use stablecoins for supplier settlement, platform payouts, treasury transfers and cross-border transactions where conventional banking can be slow, expensive or operationally inconvenient.

Card products are creating another bridge.

A user can hold value in stablecoins while paying at an ordinary merchant that never touches a blockchain. Behind the transaction, the stablecoin balance is converted through payment infrastructure familiar to the merchant.

This model matters because it removes one of the largest barriers to adoption: merchant acceptance.

The merchant does not need to integrate a stablecoin wallet or change its checkout infrastructure. The digital-money layer sits behind the existing payment experience.

That makes adoption easier.

It also makes the architecture more dependent on issuers, card networks, banking partners, liquidity providers and conversion infrastructure.

Stablecoins may become more visible economically while becoming less visible to the person actually making the payment.

Money at scale has stricter requirements

A payment instrument used occasionally by a specialised group can tolerate characteristics that become problematic at national or international scale.

Money needs to behave predictably.

A euro in one regulated bank account is expected to have the same nominal value as a euro in another. Users normally do not examine the balance sheet of every intermediary before accepting a bank transfer.

That quality is sometimes described as the singleness of money.

Stablecoins complicate this because several privately issued tokens can represent the same currency while relying on different reserve structures, legal entities, blockchains and redemption arrangements.

One dollar-denominated stablecoin may trade at $1.00 while another temporarily trades at $0.997 or $1.003. Moving between them may require conversion, liquidity and transaction fees.

Those differences appear small when the market functions normally.

They become more important when the instruments are used as money across a large part of the economy.

Redemption is the foundation

Every fiat-backed stablecoin ultimately depends on confidence in redemption.

Users need to believe that the token can be converted into the underlying currency at par.

That confidence depends on reserve quality, custody, liquidity, legal structure and the issuer’s ability to process redemptions during periods of stress.

Normal operating conditions are the easy part.

The harder scenario occurs when many users want to redeem simultaneously.

Banks operate inside a monetary framework that includes central-bank liquidity and established mechanisms for managing system-wide stress. Stablecoin issuers generally operate with much more limited access to those facilities.

Highly liquid reserves can reduce the risk significantly, but they do not make the question disappear.

If stablecoins become materially larger, the structure supporting redemption becomes part of financial stability rather than simply issuer risk management.

Interoperability goes beyond blockchain bridges

Stablecoins can move quickly inside individual blockchain environments.

The market becomes more complicated across networks.

Tokens exist on multiple chains. Liquidity differs between them. Bridges introduce their own operational and security risks. Custodians and exchanges support different combinations of assets and networks.

Businesses therefore need more than fast settlement.

They need a consistent way to understand where the transaction occurred, which version of the asset was used, how it can be redeemed and which counterparties support the route.

This becomes particularly important for finance teams.

A payment system operating across several blockchains, issuers and liquidity providers can create substantial complexity around accounting, reconciliation and treasury visibility even when the individual transfer is nearly instantaneous.

Interoperability needs to work at several levels simultaneously: technical, financial, legal and operational.

Financial crime controls have to scale with the network

Stablecoin payments also sit inside an unusual compliance environment.

Blockchain transactions can provide detailed transaction histories, which gives compliance teams information that may not exist in some traditional payment systems.

Identity usually sits outside the blockchain.

A wallet address does not automatically reveal the legal entity controlling it, the commercial purpose of a payment or the beneficial owner behind a counterparty.

Regulated exchanges and custodians create important identification points, but stablecoins can also move through self-hosted wallets and across jurisdictions with very different compliance standards.

That means large-scale adoption requires stronger coordination between on-chain analytics and conventional financial-crime controls.

The transaction history may be transparent.

Its commercial context still needs to be understood.

Dollar stablecoins create a monetary-policy dimension

Most large stablecoins remain denominated in U.S. dollars.

That has strategic implications outside the United States.

In economies with weaker currencies, residents may increasingly prefer dollar stablecoins for savings, commerce or cross-border transfers. Digital access makes holding and transferring dollar-linked value considerably easier than opening a conventional U.S. bank account.

For users, that can provide protection against domestic currency volatility.

For central banks, large-scale adoption can weaken monetary sovereignty.

If households and companies price more transactions or store more liquidity in digital dollars, domestic monetary policy has less influence over part of the economy.

This helps explain the very different tone around stablecoins in the United States and elsewhere.

U.S. policymakers can view dollar stablecoins as an extension of dollar demand and a potential source of demand for Treasury securities. Other central banks may see the same development as a form of digital dollarisation.

Both perspectives can be economically rational.

They simply reflect different positions in the monetary system.

Tokenised deposits offer a competing architecture

The BIS preference for tokenised deposits deserves attention because the two models solve some of the same problems differently.

A tokenised deposit remains a claim on a regulated commercial bank.

The technology can potentially provide programmability, continuous operation and integration with tokenised assets while preserving the existing relationship between commercial-bank money and central-bank settlement.

This gives banks an architectural advantage.

They already operate inside established liquidity, supervision and monetary frameworks.

Stablecoins have a different advantage.

They can move more easily across digital platforms, operate outside traditional banking hours and often reach users that do not share the same banking infrastructure.

The market therefore does not need to produce a single winner.

Different forms of digital money can coexist around different use cases.

Stablecoins may remain particularly strong in cross-border settlement, digital commerce and specialised treasury flows. Tokenised deposits may become more attractive where institutions want programmable money without moving outside the commercial-banking framework.

The relative importance of each model will depend heavily on interoperability.

Payments are already showing the likely structure

Stablecoin cards provide a useful preview of how this coexistence may develop.

The customer holds a stablecoin.

The merchant accepts a conventional card transaction.

A regulated network connects the two.

The customer gains access to a digital asset with global portability while the merchant continues operating through familiar payment infrastructure.

This hybrid architecture is likely to appear elsewhere.

Businesses may hold bank deposits while using stablecoins for selected cross-border corridors. Tokenised deposits may support institutional settlement while central bank money remains the final monetary anchor. Stablecoins may provide liquidity between digital platforms.

The result is unlikely to be a clean migration from traditional money to one new digital instrument.

It will probably be a multi-rail environment.

That increases the importance of the operating layer connecting those rails.

What businesses should evaluate

A business considering stablecoin settlement should look beyond transaction speed and nominal transaction fees.

Issuer quality, reserves and redemption matter. So do the networks carrying the asset, available liquidity, supported jurisdictions, counterparties and the banking infrastructure connecting stablecoins back to fiat.

The operational questions are equally important: how transactions enter treasury reporting, how payments are reconciled, how wallet addresses are linked to counterparties, how exceptions are handled and what happens when liquidity on a particular network becomes limited.

This is where adoption moves from experimentation into financial operations.

A stablecoin can work perfectly at protocol level while remaining difficult for the finance function to operate.

Scale depends on solving both problems.

MetaNord’s view

At MetaNord, we see the current debate as a sign of stablecoin maturity.

The discussion is becoming less focused on whether the technology works. Years of live activity have already answered much of that question.

Attention is turning toward the institutional architecture required around it.

Redemption, liquidity, interoperability, compliance, treasury visibility and reconciliation become increasingly important as stablecoin usage grows.

The BIS concerns should therefore be taken seriously without assuming that they invalidate the stablecoin model.

Stablecoins already solve genuine problems in specific payment and settlement environments. Tokenised bank deposits are likely to solve others.

The more realistic financial system may include both.

For businesses, the advantage will come from infrastructure capable of operating across different forms of money without losing visibility or control.

Stablecoins have passed the technology test.

Scale will be determined by everything built around them.