perspective
Monetary Sovereignty in the Age of Stablecoins
Oliver Wyman identifies three channels through which stablecoins erode monetary sovereignty: reduced policy traction, deposit substitution, and crisis acceleration. All three concentrate in holding behavior, not payment transit.
Published
A transit versus holding framework for stablecoin policy: when stablecoins are payment rails they can coexist with sovereign systems; when they become savings instruments they create sovereignty risk.
Reader Brief
Oliver Wyman identifies three channels through which stablecoins erode monetary sovereignty: reduced policy traction, deposit substitution, and crisis acceleration. All three concentrate in holding behavior, not payment transit.
Reading Guide
Four ideas to anchor the policy distinction between stablecoin transit and stablecoin holding.
This Perspective asks whether stablecoins can coexist with sovereign monetary systems. Its answer depends on use. A stablecoin used for fiat-in, fiat-out payment transit has a different monetary effect from a stablecoin held as savings.
Three sovereignty erosion channels - policy traction, deposit substitution, crisis acceleration - all concentrate in holding, not transit.
Oliver Wyman identifies three mechanisms: weakened interest rate transmission when savings escape into USDT, bank funding pressure when deposits migrate to stablecoin balances, and faster crisis dynamics when capital flight goes on-chain. None of the three operates on transit-only flows [1].
The transit versus store-of-value distinction is the policy fulcrum: same instrument, opposite implications.
A stablecoin used for fiat-in, fiat-out payment for minutes does not substitute deposits or weaken policy. The same stablecoin held as savings does both. Treating both uses under one regime is the most common policy error, and the worst outcome: blocked formal transit plus unregulated informal holding.
Five regime types - ban, transit-only, contained holding, permissive, and unregulated - make different sovereignty trade-offs.
China represents the ban model. Singapore initial and Chile represent transit-only. UAE, ADGM, and the UK proposal represent contained holding. EU MiCA and the US GENIUS Act represent a more permissive model. Most emerging markets before 2024 represent the unregulated state. Each is a different combination of corridor openness, holding restrictions, yield permission, and institutional access [2].
The GENIUS Act and emerging-market central banks can reach opposite conclusions from the same data.
A non-US citizen holding USDC in El Salvador reduces Salvadoran monetary sovereignty, not US Federal Reserve sovereignty. From Washington this is a sovereignty dividend; from Buenos Aires it is a sovereignty risk. Both jurisdictions are acting rationally within their own calculus.
The Question
The question is not whether stablecoins exist. The question is what they are used for in each jurisdiction.
Can stablecoins coexist with sovereign monetary systems? The global policy conversation has polarized between two positions: stablecoins are existential threats to monetary sovereignty, or stablecoins are enabling infrastructure for dollar dominance. Both positions ignore the technical distinction that determines the policy outcome. The question is not whether stablecoins exist. The question is what they are used for in each jurisdiction.
- 3 Channels of sovereignty erosion identified by Oliver Wyman. All concentrate in holding, not transit [1].
- 8 Jurisdictions with operating frameworks that separate transit from holding. Analysis preserved from the Notion article [2].
The framework: transit versus store of value is the policy fulcrum.
Oliver Wyman's central insight: stablecoin activity splits cleanly into two categories with opposite policy implications. **Transit**: stablecoin used as a payment rail. Fiat in, stablecoin for minutes, fiat out. Zero deposit substitution. Zero dollarization pressure. **Store of value**: stablecoin held as savings. Replaces local currency deposits. Reduces monetary policy traction. Genuine sovereignty risk. The error most regulators make is treating both uses under a single policy regime. This produces the worst outcome: formal transit infrastructure is blocked while informal holding continues unregulated [1].
Channel 1: Monetary Policy Traction
When savings move into foreign-currency stablecoins, domestic interest rate transmission weakens.
If households and businesses hold foreign-currency stablecoins as primary savings, domestic interest rate transmission weakens. When the central bank raises rates to cool inflation, savers who hold USDT do not feel the signal. Monetary policy becomes less effective. The mechanism is straightforward: rate changes transmit only through balances that remain exposed to the local monetary system.
Quantifying the leakage: Argentina and Turkey show what happens when a large share of savings escapes the monetary base.
Argentina and Turkey provide the clearest case studies in this analysis. Both have experienced periods of high inflation. In both, significant shares of savings moved into dollar-equivalent instruments: historically physical USD, and increasingly USDT. **Argentina**: Chainalysis ranks the country #2 in LATAM on-chain volume, driven largely by USDT accumulation during 300%+ inflation in 2023-2024 [3]. Central bank policy tools saw reduced effectiveness during this period. **Turkey**: USDT volume is estimated at around 4.3% of GDP despite a 2021 payment ban [4]. TCMB interest rate changes face similar transmission friction. The pattern is consistent in this analysis: stablecoin holding rises as local currency weakens, and the share of savings immune to policy signals grows. This is the channel 1 erosion Oliver Wyman identifies [1].
The counter-evidence: transit-only use does not affect monetary policy traction at all.
A stablecoin payment that starts in local fiat, transits for minutes, and ends in local fiat does not compete with domestic deposits. The sender pays in naira; the recipient receives yuan. No household or business holds stablecoin as savings. This is why the transit/holding distinction matters. The same instrument can erode sovereignty if held, or strengthen formal corridors if used for transit only. Policy that blocks transit does not reduce holding; it pushes holding into informal channels where the central bank loses visibility entirely.
Channel 2: Bank Deposit Substitution
When stablecoin balances substitute for bank deposits, bank funding costs rise and credit availability weakens.
If households and businesses migrate savings from bank deposits into stablecoin balances, bank funding costs rise. Banks must pay higher interest to retain deposits or replace them with wholesale funding. The result is higher lending rates, reduced credit availability, and weaker bank balance sheets in aggregate.
- ~60% Share of bank liabilities that are deposits in typical emerging market banks. The pool at risk of substitution in this analysis.
- 10-30% Hypothesized substitution rate in high-inflation emerging markets. The source explicitly notes actual rates are poorly measured.
The mechanism: when stablecoin balances offer better yield or FX stability, bank deposits leak.
Bank deposits have two things stablecoins typically do not offer: domestic currency denomination and interest. But in an inflationary environment, domestic currency denomination becomes a liability, not an asset. Yield-bearing stablecoins, where permitted, can offer competitive interest. The GENIUS Act explicitly prohibits yield on payment stablecoins precisely to prevent this substitution [5]. The UK Bank of England proposed framework similarly restricts yield for systemic stablecoins [6]. These are not anti-stablecoin moves. They are pro-banking-sector defenses designed to preserve the deposit base.
The policy response: balance caps, no yield, custodial-only. Stage 2 containment.
Jurisdictions that permit stablecoin holding have converged on a common set of controls: 1. **Balance caps**: transitional limits on stablecoin holdings per licensed entity, calibrated to payment volume. 2. **No yield**: prohibition on interest-bearing stablecoin balances, including the GENIUS Act and UK Bank of England proposal [5][6]. 3. **Custodial-only**: stablecoins held only in licensed financial institution infrastructure, with ADGM FRT as the source example. 4. **Aggregate reporting**: real-time central bank visibility into total holdings. These controls preserve the settlement utility of stablecoins while neutralizing their deposit-substitution potential. The regulator retains authority to tighten or relax based on evidence.
Channel 3: Crisis Acceleration
Stablecoins compress capital-flight dynamics from days or weeks into minutes.
During a currency crisis, capital flight historically took days or weeks. Physical cash had to be moved, real estate had to be liquidated, and bank wires had to clear. Stablecoins compress this to minutes. Crisis dynamics that used to unfold over a month can now unfold over an afternoon.
Historical pattern: currency crises now have an on-chain signature.
Capital flight during currency crises is not new. What stablecoins change is the speed and the visibility. **Speed**: a USDT transfer on TRON completes in under 60 seconds. A Telegram OTC transaction completes in minutes. Compared to days or weeks for physical cash or bank wires, this is a step-change. **Visibility**: on-chain transactions are timestamped and traceable. A central bank with appropriate tools can observe capital flight in real time, at the aggregate level if not at the individual level. The 2022-2023 Ghana cedi depreciation, Nigeria's naira devaluations, and Argentina's peso instability all showed measurable spikes in on-chain stablecoin volume during the crisis windows [3]. The correlation is not proof, but the pattern is consistent: crises now have an on-chain component.
The counter-intuition: visibility is a policy asset, not a threat.
A central bank that can see capital flight in real time has more policy options than one that cannot. Informal flight through hawala or physical cash is invisible. Stablecoin flight is observable. This reframes the policy question. Banning stablecoins does not stop capital flight. It pushes it back into invisible channels. Permitting stablecoins under supervision converts invisible flight into observable flight, giving the central bank data it previously lacked. The FATF Travel Rule, properly enforced, requires licensed operators to attach originator and beneficiary data to qualifying cross-border transfers [7]. This is the visibility infrastructure that a sovereign supervisory regime requires.
The Sovereignty Spectrum
Every stablecoin policy regime makes trade-offs across corridor openness, holding restrictions, yield permission, and institutional access.
No jurisdiction faces binary choices. Every stablecoin policy regime makes trade-offs across four dimensions: corridor openness, holding restrictions, yield permission, and institutional access. The combinations produce distinct sovereignty profiles.
| Regime type | Transit | Holding | Yield | Example |
|---|---|---|---|---|
| Ban | Blocked | Blocked in theory | N/A | China, pre-2021 India |
| Transit-only | Licensed operators | Prohibited for retail | N/A | Singapore initial, Chile |
| Contained holding | Licensed operators | Licensed FIs, caps, custodial | Prohibited for payment stablecoins | UAE, ADGM, UK proposal |
| Permissive | Licensed operators | Broad retail access | Permitted with disclosures | EU MiCA, US GENIUS Act |
| Unregulated | Informal only | Informal only | No framework | Most EM pre-2024 |
The transit-only regime is the fastest-deploying stability option. It captures the payments benefit while neutralizing all three sovereignty channels.
Transit-only regimes, including Singapore's initial approach and Chile's fintech law in this analysis, permit stablecoin activity exclusively as payment infrastructure. Licensed operators can on-ramp and off-ramp, but retail users cannot hold stablecoin balances. The stablecoin exists only during the transit window. This eliminates all three Oliver Wyman channels by design: **Channel 1, policy traction**: no holding, no savings substitution, no interest rate transmission loss. **Channel 2, deposit substitution**: fiat returns to the banking system at off-ramp, and deposits are not drained. **Channel 3, crisis acceleration**: transit flows do not convert to held positions, so no flight-capable balances accumulate. The cost is that transit-only regimes do not capture the monetary-composition benefits of sanctioned dollar-reserve instruments, as the GENIUS Act explicitly seeks for US policy.
The GENIUS Act bet: permissive holding plus sovereign dollar expansion.
The US approach under the GENIUS Act, as framed in this analysis, is qualitatively different [5]. It permits broad retail holding of payment stablecoins issued under US oversight. The policy bet is that dollar-denominated stablecoins extend dollar dominance globally at negligible cost to domestic monetary sovereignty. For the US, the channel 1, 2, and 3 risks run in reverse. A non-US citizen holding USDC in El Salvador reduces the sovereignty of the Salvadoran central bank, not the US Fed. From a US perspective, this is a sovereignty dividend, not a risk. This asymmetry explains why emerging-market central banks and the US Treasury have opposite preferences on the same instrument. Both are acting rationally within their own sovereignty calculus.
Evidence And Sources
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- Monetary Sovereignty in the Age of Stablecoins - Oliver Wyman
- Global Approaches to Stablecoin Regulation - EY
- 2024 Geography of Cryptocurrency Report; LATAM Crypto Adoption - Chainalysis
- Turkey bans crypto payments - Reuters; Tap Protocol research estimates
- GENIUS Act; Next steps for GENIUS - US Senate; Brookings
- Proposed Regulatory Regime for Sterling-Denominated Systemic Stablecoins - Bank of England
- Updated Guidance for VAs and VASPs - FATF