Stablecoin Coexistence

1. The Coexistence Question

1.1 Why CBDCs and Stablecoins Are Not Either/Or

The framing of CBDCs versus stablecoins as a binary choice is a policy error. CBDCs are public money — direct liabilities of a central bank, denominated in the sovereign currency, and typically designed for universal access with legal tender status. Stablecoins are private money — liabilities of a commercial issuer, backed by reserves of fiat currency or low-risk assets, and designed for programmability, composability with decentralised finance, and 24/7 cross-border settlement. These instruments serve overlapping but distinct functions, and the emerging regulatory landscape across the 20 jurisdictions surveyed in this domain reflects this reality.

The BIS 2020 foundational principles report, co-authored with seven major central banks, established that "a CBDC would need to coexist with and complement existing forms of money." This principle has shaped every serious CBDC design since its publication.

Source: BIS, "Central bank digital currencies: foundational principles and core features," October 2020

The IMF's December 2025 departmental paper "Understanding Stablecoins" underscored the dual-track reality: stablecoin market capitalisation of the two largest issuers tripled since 2023 to a combined $260 billion, with trading volume increasing 90% to $23 trillion in 2024 — even as 91% of 93 central banks surveyed by the BIS were actively exploring CBDCs.

Source: IMF, "Understanding Stablecoins," December 2025

1.2 Market Data: The Stablecoin Trajectory

As of early 2026, the global stablecoin market has reached unprecedented scale:

This growth is not slowing. Q4 2025 alone saw $11 trillion in stablecoin transactions, up from $8.8 trillion in Q3 2025. The stablecoin market has grown approximately 50% year-over-year as of early 2026.

Sources:

• Stablecoin Transactions Soared 72% in 2025 — Yahoo Finance
• Stablecoin Market Hits $310.4B All-Time High — KuCoin

1.3 Central Bank Positions on Coexistence

Across the 20 jurisdictions in this domain, central banks have adopted a spectrum of positions on the CBDC-stablecoin relationship:

BIS (technology-neutral framework): The BIS applies a framework that is deliberately technology-neutral across stablecoins, tokenised deposits, CBDCs, and new financial infrastructures. The 2024 BIS survey found that more than one in three jurisdictions had accelerated CBDC work specifically in response to stablecoin developments. The BIS Annual Economic Report 2025 promoted the concept of a "unified ledger" where central bank money and regulated private digital assets coexist under a coordinated framework.

Source: BIS Papers No. 159, "Advancing in tandem," August 2025

ECB (complementary but distinct): The ECB has drawn a clear line between the digital euro as central bank money (excluded from MiCA scope) and MiCA-regulated stablecoins as private money. Nine European banks announced a consortium in September 2025 to develop a MiCA-compliant euro stablecoin; ten banks later confirmed the entity (Qivalis, Amsterdam-based) with a planned launch by mid-2026.

Source: CoinDesk, "Nine European Banks Join Forces," September 2025

Bank of England (multi-money ecosystem): Deputy Governor Sarah Breeden has described the UK as moving toward "a multi-money mixed ecosystem" where central bank money, bank deposits, and regulated stablecoins coexist and remain fully interchangeable. Her May 2026 "Modernising money and markets" speech reaffirmed this multi-money vision.

Source: BoE — Sarah Breeden speech, September 2025

PBOC (monopolistic replacement): China has taken the opposite approach — a comprehensive prohibition on private stablecoins, with the e-CNY positioned as the sole permitted digital currency. The February 6, 2026 notice (Yinfa No. 42) formalised the ban on RMB-linked stablecoins and real-world-asset (RWA) tokenisation, with extraterritorial reach.

Source: CoinDesk, "China expands crypto crackdown to stablecoins," February 2026

U.S. Federal Reserve / Congress (stablecoin-only): The United States is the only major economy to formally bar CBDC development — by executive action (EO 14178) rather than statute — and positions regulated stablecoins under the GENIUS Act (S. 1582 / Public Law 119-27) as the exclusive digital-dollar strategy. New Fed Chair Kevin Warsh, sworn in 22 May 2026, has reaffirmed opposition to a retail CBDC.

Source: White House Fact Sheet — GENIUS Act, July 2025

2. Regulatory Models

Model A: CBDC Displaces Stablecoins —

China

Architecture: The PBOC has banned all cryptocurrency transactions (September 2021 Joint Notice) and, via the Notice known as Yinfa No. 42 (February 6, 2026), specifically targeted RMB-linked stablecoins and real-world asset tokenisation with extraterritorial reach. Unapproved issuance is strictly forbidden, whether by domestic or offshore entities targeting Chinese users.

CBDC design: The e-CNY was originally designed as M0 (cash equivalent). Effective January 1, 2026, under the PBOC's "Action Plan for Strengthening Digital Yuan Management," it was reclassified toward a commercial bank deposit-money model. Verified-wallet holders (Categories 1-3) earn interest at an initial 0.05% annual rate, with the first quarterly payout made March 20, 2026. This reclassification means e-CNY balances count toward bank reserve requirement calculations, and the PBOC roster of authorised operators doubled to 22 on April 2, 2026 (12 new banks added).

Rationale: The PBOC has stated that stablecoins fail to meet standards for customer identification and anti-money-laundering controls. China's policy channels all digital asset advancement into the e-CNY and supervised financial markets.

Scale: As of November 2025 (self-reported PBOC aggregate data): 3.48 billion cumulative transactions, CNY 16.7 trillion (~$2.37 trillion) in cumulative value, 2.25 billion wallets, ~5.6 million registered merchants.

Assessment: This model achieves regulatory clarity and eliminates licensed private stablecoin competition. However, adoption challenges persist — average transaction values declined from CNY 1,895 (2023) to CNY 428 (2025), and the interest-bearing pivot implicitly acknowledges that the non-interest-bearing CBDC model was insufficient to drive organic adoption. The PIIE has argued the reclassified e-CNY "may no longer qualify as a CBDC under standard definitions."

Sources:

• State Council of the PRC, December 29, 2025
• PIIE, "China gives up on state-backed digital cash," 2026
• CoinDesk, "China expands crypto crackdown to stablecoins," February 2026

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Model B: Parallel Regulation —

EU

Architecture: The EU operates two distinct regulatory tracks: MiCA (Regulation 2023/1114) for crypto-assets including stablecoins, and the proposed Digital Euro Regulation (COM(2023) 369) for the CBDC. The digital euro is explicitly excluded from MiCA's scope as a central bank liability.

MiCA stablecoin framework (effective since June 30, 2024):

• E-money tokens (EMTs) must be issued by authorised credit institutions or electronic money institutions
• Full liquid asset backing required
• Redemption at par value guaranteed
• Article 22(4) prohibits interest or yield-bearing features on asset-referenced tokens
• Transaction caps on non-EUR stablecoins: 1 million transactions daily or EUR 200 million in payment value
• Transitional periods for existing CASPs run until July 1, 2026

Digital euro (pending legislation):

• Legal tender status throughout the euro area
• ECB-set holding limits (the Commission impact assessment modelled EUR 3,000 per person; the Council's December 2025 negotiating position provides for an ECB-set limit within a Council-agreed ceiling reviewed at least every two years); zero limit for businesses and public authorities (waterfall to bank account)
• Non-interest bearing (zero remuneration by design)
• Two-tier distribution through supervised PSPs
• Both online (pseudonymised) and offline (cash-like privacy) modes
• The ECB's preparation phase concluded in October 2025 and the Governing Council moved the project to its next phase on 29-30 October 2025. The Eurosystem opened a PSP pilot call on 5 March 2026; a 12-month pilot is targeted for H2 2027 and potential first issuance during 2029, contingent on the EU adopting the Regulation. The ECON Committee vote on the draft report is scheduled for 23 June 2026.

Interoperability status: Questions about conversion standards between the digital euro and MiCA-regulated euro stablecoins remain formally open; no finalised interoperability framework existed as of March 2026. The Qivalis consortium (ten European banks including BNP Paribas, ING, UniCredit) plans a MiCA-compliant euro stablecoin by mid-2026 — potentially years before the digital euro launches.

Assessment: The parallel-regulation model provides the clearest separation of public and private digital money. However, the digital euro's late timeline (potential issuance 2029) creates a window where MiCA-regulated stablecoins become the de facto digital euro instrument, potentially reducing the digital euro's relevance upon arrival. The MiCA ban on interest-bearing stablecoins aligns with the digital euro's non-remuneration, preventing a competitive asymmetry.

Sources:

• EUR-Lex — COM(2023) 369, June 2023
• ESMA — MiCA
• Euro Stablecoin Landscape: Trends and Insights for 2026 — Utila

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Model C: Stablecoins Preferred, No CBDC —

United States

Architecture: The United States combines an anti-CBDC posture with a comprehensive stablecoin regime. The only binding prohibition on CBDC is Executive Order 14178 (January 23, 2025), which bans all federal CBDC activity and revoked EO 14067. Statutory bans have advanced but are not enacted: the Anti-CBDC Surveillance State Act (H.R. 1919) passed the House 219-210 (July 17, 2025) but not the Senate; and the 21st Century ROAD to Housing Act, carrying a CBDC moratorium through December 31, 2030, passed both chambers in differing forms (Senate 89-10 on March 12, 2026; House 396-13 on May 20, 2026 with the Section 1001 moratorium retained) but the versions remain unreconciled and the moratorium is not yet law. Simultaneously, the GENIUS Act (S. 1582), signed July 18, 2025 as Public Law 119-27, establishes a comprehensive stablecoin regulatory framework.

GENIUS Act key provisions:

• Issuers must be subsidiaries of insured depository institutions, OCC-supervised nonbank entities, or qualifying state-chartered entities
• 1:1 reserve backing required (cash, Treasury bills, government money market funds, central bank reserves)
• Rehypothecation of reserves prohibited (except for redemption liquidity)
• Bank Secrecy Act / AML compliance mandatory
• Issuers must possess technical capability to seize, freeze, or burn stablecoins under legal orders
• Stablecoin holders receive priority over all other claims in issuer bankruptcy
• Foreign issuers from qualifying jurisdictions may register with the OCC and hold reserves in U.S. financial institutions
• Periodic reserve composition reports certified by executives and examined by registered public accounting firms

Rationale: The U.S. frames the debate as privacy versus surveillance. CBDC is characterised as a government surveillance tool; stablecoins preserve private-sector intermediation while maintaining dollar dominance. The stablecoin-first approach avoids disintermediation risk entirely — stablecoins are commercial bank or private-sector liabilities, not central bank liabilities. New Fed Chair Kevin Warsh (sworn in 22 May 2026, confirmed 54-45) has reaffirmed opposition to a retail CBDC while floating only a narrow wholesale digital-dollar concept.

Assessment: This model maximises private-sector innovation and avoids the disintermediation debate. The risks are: (1) counterparty risk — stablecoins are not central bank money and carry issuer risk; (2) the CBDC ban rests on an executive order that a future administration could revoke, and the proposed 2030 statutory sunset has not been enacted; (3) reliance on private issuers for the digital dollar may not serve populations that private companies find unprofitable; (4) other nations' CBDCs (particularly the digital euro and e-CNY) could erode dollar dominance in cross-border settlement.

Sources:

• GENIUS Act (S. 1582) — Congress.gov
• Covington — GENIUS Act Key Provisions, July 2025
• White House Fact Sheet — GENIUS Act, July 2025
• Disruption Banking — Senate CBDC Ban, March 2026

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Model D: Complementary Design —

Singapore

Architecture: MAS has deliberately separated wholesale CBDC (live issuance on the SGD Testnet since 2024-2025) from stablecoin regulation (Single-Currency Stablecoin framework finalised August 2023) and retail digital money (Purpose-Bound Money protocol under Project Orchid). Each serves a distinct layer of the monetary stack.

Wholesale CBDC: The SGD Testnet achieved live issuance of Singapore dollar wholesale CBDC, including the first live wholesale CBDC transaction (overnight interbank lending among DBS, OCBC, and UOB) in November 2025. Tokenised MAS Bills to be settled via wholesale CBDC are planned for 2026.

MAS-regulated stablecoins (SCS framework, August 2023):

• Applies to single-currency stablecoins pegged to SGD or G10 currencies, issued in Singapore
• Reserve assets must maintain 100% backing at all times
• Issuers must return par value within five business days
• Only compliant issuers may use the "MAS-regulated stablecoin" label
• Issuers are prohibited from providing lending, staking, or other non-issuance services
• Multi-jurisdictional issuance not permitted initially

Purpose-Bound Money (retail layer): PBM wraps digital currency (CBDC, tokenised deposits, or stablecoins) with programmable conditions. This protocol is deliberately currency-form-agnostic — it works with any form of digital money, positioning Singapore to accommodate whichever form prevails. MAS's BLOOM initiative (October 2025) extends this to tokenised bank liabilities and regulated stablecoins across G10 and Asian currencies.

Assessment: Singapore's model is the most architecturally sophisticated: wholesale CBDC for institutional settlement, regulated stablecoins for programmable digital payments, and PBM as a universal protocol layer. The risk is complexity — three parallel tracks require coordinated governance — and the retail CBDC question remains unresolved (MAS has assessed "no urgent need" for retail issuance).

Sources:

• MAS — Stablecoin Regulatory Framework, August 2023
• MAS — Project Orchid
• MAS — Commercialisation of Asset Tokenisation, November 2024

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Model E: Programmable CBDC Absorbing Stablecoin Use Cases —

Brazil

Architecture: Brazil's Drex (Digital Real) was originally designed as a programmable CBDC platform that would natively provide the functionality for which other jurisdictions rely on stablecoins: smart contract settlement, tokenised asset transfer, conditional payments, and DeFi-adjacent automation. This approach attempted to make private stablecoins unnecessary by building their capabilities directly into the CBDC.

Stablecoin regulation (parallel track):

• BCB Resolution 521 (November 2025, effective February 2, 2026) classifies fiat-referenced stablecoin operations as foreign exchange operations — capturing the bulk of Brazil's crypto transaction volume, which is dominated by stablecoins
• Resolutions 519/520/521 together operationalise the VASP/stablecoin framework
• Crypto tax: Provisional Measure 1303/2025 (proposing a flat 17.5% rate) lapsed (caducou) on October 8, 2025 when the Câmara removed it from the agenda 251-193; the progressive 15-22.5% regime with a R$35k exemption remains in force for 2026

The 2025 pivot: After four years of testing on Hyperledger Besu, the BCB announced in August 2025 (Galipolo: "the blockchain technology tested did not prove viable") that privacy was the core obstacle — zero-knowledge proof solutions prevented the BCB from performing monetary controls and KYC/AML compliance. The BCB then told consortia (November 4, 2025) it would rebuild "from scratch," and the Hyperledger Besu Drex platform was decommissioned on November 10, 2025. Phase 3, narrowed to collateral management and lien reconciliation, is to begin in 2026; the BCB has given no firm launch timeline (Galipolo: "not necessarily" for 2026).

Assessment: Brazil's experience provides a critical lesson: absorbing stablecoin use cases into a CBDC is technically ambitious but faces a "trilemma" — privacy, decentralisation, and programmability cannot all be maximised simultaneously with current technology. The BCB's pivot preserves institutional learning while acknowledging technological limitations and de-scoping the project from "programmable money" toward lien reconciliation. Meanwhile, stablecoins continue to dominate Brazil's digital asset market.

Sources:

• BCB — Drex Phase 1 Report, February 2025
• Ledger Insights — DREX pivots away from blockchain, August 2025
• Chainalysis — Brazil's New Crypto Framework, 2025

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Model F: Stablecoin Regime Without (or Ahead of) a CBDC —

Canada

Architecture: Canada has scaled down retail CBDC work (September 24, 2024 — Governor Macklem: "not currently a compelling case") while legislating for private stablecoins. The Stablecoin Act (enacted via Bill C-15, the Budget 2025 Implementation Act, No. 1) received Royal Assent on March 26, 2026 but is not yet in force; it expressly excludes CBDCs from its scope. The first regulated CAD-backed stablecoins are already live: CADD (Tetra Trust, Alberta framework) launched May 4, 2026 — a private stablecoin, not a CBDC.

CBDC status: No CBDC authority exists; both the Bank of Canada Act (s.25, physical notes only) and the Currency Act would require legislative amendment to issue one. The Bank of Canada continues wholesale experimentation — Project Samara settled a CAD $100M tokenised bond with wholesale W-CAD on Hyperledger Fabric, completing March 5, 2026 — but its retail CBDC posture is now contingency planning only, converging with the U.S. skeptical stance.

Assessment: Canada illustrates a stablecoin-first sequencing in which a regulated private-money regime is legislated and launched while the CBDC question is parked. Because the Stablecoin Act is enacted but not yet in force, the operative regime for live CAD stablecoins (e.g., CADD) is the provincial Alberta framework in the interim. The express exclusion of CBDCs from the Act keeps the two tracks cleanly separated, leaving any future digital Canadian dollar to separate primary legislation.

Sources:

• Bank of Canada — Macklem speech, December 16, 2025 ("Good Money and Your Central Bank")
• Parliament of Canada — Bill C-15 (Budget 2025 Implementation Act, No. 1)
• Bank of Canada — Project Samara

3. Comparative Table

This table covers the six jurisdictions that anchor the coexistence models above; the full 20-jurisdiction landscape is summarised in §3.1.

3.1 The 20-Jurisdiction Landscape at a Glance

Of the 20 jurisdictions tracked in this domain, the CBDC-vs-stablecoin postures distribute as follows (counts re-derived from the regulatory spectrum):

• Launched / live retail CBDC (4):
  Bahamas (Sand Dollar),
  Nigeria (eNaira),
  Jamaica (JAM-DEX), and
  India (e₹, a live pilot) — all legal-tender or formally launched, all adoption-challenged. China's e-CNY operates at live, large-scale pilot scale (not a formal nationwide legal-tender launch).
• Pilot then discontinued / suspended (1): Eastern Caribbean — DCash pilot concluded January 2024; DCash 2.0 development suspended by the ECCB Monetary Council on February 13, 2026 in favour of a Fast Payment System + CAPS.
• Active pilot, no launch (incl. wholesale-pilot) (≈6):
  China (large-scale retail pilot), India (dual retail+wholesale pilot),
  South Korea (Project Hangang deposit-token pilot),
  Russia (mandated large-scale launch 1 Sep 2026; narrow live government use since Jan 2026),
  Singapore and
  Australia (live/completed wholesale pilots).
• Research / design / no launch decision (≈8): United States (anti-CBDC), Canada (scaled down),
  Japan,
  Thailand (completed retail pilot, no launch), EU (preparation),
  Sweden (research),
  UK (design),
  South Africa (research-PoC),
  Ghana (pilot completed, design phase).
• Anti-CBDC (1): the United States is the only jurisdiction in the set to formally bar CBDC development (via EO 14178).

On the stablecoin side, the jurisdictions split between comprehensive licensing regimes (US GENIUS Act; EU MiCA; Singapore SCS; Canada Stablecoin Act, not yet in force; Brazil's FX-classification under BCB Res. 521; UK systemic-stablecoin regime in consultation) and prohibition (China's Yinfa No. 42 ban on RMB-linked stablecoins). Several CBDC-skeptical jurisdictions are pivoting toward private/commercial-bank stablecoins as the preferred digital-money form — notably Nigeria (cNGN task force), Thailand (Programmable Payment Sandbox), and South Africa (Project Khokha 2x bank-issued stablecoins).

4. Key Policy Questions

4.1 Should CBDCs Be Convertible with Stablecoins at Par?

This is the foundational interoperability question. If a CBDC and a regulated stablecoin both represent one unit of the same sovereign currency, should holders be able to convert between them at par (1:1) without friction?

Arguments for par convertibility:

• Preserves the singleness of money — a core principle of monetary systems that ensures all forms of a currency are worth the same
• The BIS has emphasised that CBDCs should "coexist with and complement existing forms of money," which implies fungibility
• Without par convertibility, a "currency exchange" friction emerges between public and private money, potentially creating a two-tier monetary system

Arguments against par convertibility:

• Stablecoins carry issuer risk; par convertibility implies equivalence with risk-free central bank money
• In a stress scenario, par conversion could accelerate runs from stablecoins into CBDC (or vice versa if CBDC has holding limits)
• The UK BoE's Financial Stability Paper No. 53 (November 2025) modelled deposit-flight scenarios and found that without holding limits, total banking sector outflows could reach significant levels under severe stress

Current policy positions:

• The UK's Bank of England has stated the digital pound should be "fully interoperable, allowing end users to move their money with ease between the digital pound, cash, commercial bank money, and other new forms of digital money" — but has not specified whether this includes automatic par conversion with stablecoins
• The EU has not specified interoperability standards between the digital euro and MiCA-regulated stablecoins
• Singapore's PBM protocol is designed to be currency-form-agnostic, implicitly supporting interoperability without mandating par conversion
• South Korea's Project Hangang deposit tokens are explicitly designed to be convertible 1:1 to commercial bank deposits, with a wholesale CBDC settlement layer underneath — an at-par architecture by construction

Source: BoE — Financial Stability Paper No. 53, November 2025

4.2 Should Stablecoin Issuers Hold CBDC Reserves?

If a jurisdiction issues a CBDC, should stablecoin issuers be required (or permitted) to hold CBDC as part of their reserve backing?

Current approaches:

• The GENIUS Act (US) permits reserves in "central bank reserves" but the US has no CBDC, making this provision currently inoperative for CBDC specifically
• MiCA requires EMT issuers to hold reserves in credit institutions or government securities; the digital euro is not yet an available reserve asset
• The UK BoE proposed that systemic stablecoin issuers hold a portion of backing in short-term UK government debt with the remainder in unremunerated accounts at the Bank of England — effectively creating a CBDC-adjacent reserve structure (the Bank signalled in May 2026 it may ease these "overly conservative" systemic-stablecoin holding limits)
• The BIS Project Aurum (Hong Kong) demonstrated a prototype where stablecoins were directly backed by CBDC in the interbank system — CBDC-backed stablecoins operating within the same infrastructure

Policy implication: If stablecoin reserves are held as CBDC, the stablecoin becomes a synthetic CBDC — a private wrapper around public money. This could strengthen stability (elimination of reserve asset risk) but raises the question of whether intermediation adds value or merely adds a fee layer.

Sources:

• BoE — Proposed regulatory regime for systemic stablecoins, November 2025
• BIS — Project Aurum

4.3 Does CBDC Make Private Stablecoins Redundant?

No jurisdiction that has launched or is developing a CBDC has found that it eliminates demand for private stablecoins. The evidence suggests structural reasons for continued stablecoin demand:

Use cases CBDCs typically do not serve:

• DeFi composability (liquidity provision, yield farming, lending protocols)
• 24/7 global settlement without central bank operating hours
• Cross-border value transfer outside CBDC-participating jurisdictions
• Programmable escrow and conditional payments in permissionless environments
• Dollar access in jurisdictions where the local CBDC is not dollar-denominated

China's experience: Despite banning RMB-linked stablecoins and deploying the world's largest CBDC pilot, Chinese users continue to access offshore stablecoin markets through VPNs and cross-border channels. The February 2026 Yinfa No. 42 notice explicitly targeted cross-border crypto activity with extraterritorial reach, implicitly acknowledging that domestic enforcement alone had not eliminated stablecoin usage.

Brazil's experience: Stablecoins overtook Bitcoin and Ethereum as Brazil's primary crypto transaction vehicle, capturing the bulk of crypto volume — even as Drex was under active development (and now, post-pivot, de-scoped).

Nigeria's experience: With eNaira largely dormant (98.5% of wallets inactive after one year, IMF), the CBN has pivoted toward a private/official stablecoin (cNGN task force, October 2025) as the more promising digital-money path — a launched-CBDC jurisdiction effectively conceding the use case to stablecoins.

4.4 Can Programmable Stablecoins Serve Use Cases CBDC Will Not?

Yes. The structural constraint on most CBDC designs is that they operate within a permissioned, centrally controlled environment. Stablecoins on public blockchains offer:

• Composability: Integration with thousands of DeFi protocols without protocol-by-protocol central bank approval
• Permissionless innovation: Any developer can build on top of a public stablecoin; CBDC innovation requires intermediary or central bank participation
• Cross-border interoperability: Public blockchain stablecoins work across jurisdictions without bilateral central bank agreements
• Programmable escrow: Complex multi-party conditional transactions without central bank infrastructure involvement

However, these advantages come with corresponding risks: smart contract vulnerabilities, lack of consumer protection guarantees, counterparty risk, and regulatory arbitrage. Notably, the EU digital euro is explicitly designed not to be programmable money ("would never be programmable money"), leaving programmable use cases to PSP value-added services and to stablecoins.

4.5 How Do Holding Limits Interact with Stablecoin Alternatives?

Holding limits are the primary CBDC safeguard against bank disintermediation. But they create a structural incentive to use stablecoins for amounts exceeding the CBDC cap:

The EU's proposed zero holding limit for businesses is particularly consequential — it means the digital euro cannot serve as a corporate treasury instrument, leaving MiCA-regulated stablecoins as the only digital euro-denominated option for business holdings.

Sources:

• ECB — Technical data on holding limits, October 2025
• BoE — Financial Stability Paper No. 53, November 2025

5. What Works and What Does Not

5.1 What Works

Clear regulatory separation (EU MiCA / digital euro). The EU's approach of regulating stablecoins under MiCA while developing the digital euro under separate legislation provides legal clarity for both public and private digital money. Market participants know which regime applies to which instrument. The MiCA ban on interest-bearing stablecoins (Article 22(4)) prevents competitive distortion with the non-interest-bearing digital euro.

Complementary layered design (Singapore). MAS's three-layer architecture — wholesale CBDC for institutional settlement, regulated stablecoins for programmable payments, Purpose-Bound Money as a universal protocol — avoids the false binary of CBDC-versus-stablecoin. Each layer addresses distinct use cases without redundancy.

Stablecoin-as-policy-instrument (US GENIUS Act). Whatever one's view of the CBDC posture, the GENIUS Act (PL 119-27) represents the most comprehensive stablecoin regulatory framework enacted anywhere. Its provisions on reserve requirements, bankruptcy priority, and foreign issuer registration create a viable regulatory architecture for private digital dollars.

Legislating the private-money track first (Canada). Canada's Stablecoin Act (Royal Assent March 26, 2026, not yet in force; CBDCs expressly excluded) shows that a jurisdiction can stand up a regulated private-money regime — with live issuance (CADD, May 2026, under the interim Alberta framework) — while deferring the CBDC decision. The clean statutory carve-out keeps the two tracks from colliding.

Multi-money ecosystem framing (UK). The Bank of England's explicit framing of a "multi-money" ecosystem where CBDC, bank deposits, and regulated stablecoins coexist and remain interchangeable provides a coherent conceptual framework. The parallel development of digital pound design and systemic stablecoin regulation within the same policy conversation avoids the fragmentation seen in jurisdictions that treat them separately.

BIS Project Aurum — CBDC-backed stablecoins. The Hong Kong Innovation Hub prototype demonstrating stablecoins backed by CBDC in the interbank system shows that the two instruments can be integrated, not merely coexistent. This "synthetic CBDC" model may prove the most resilient architecture.

5.2 What Does Not Work

Banning stablecoins without a viable CBDC alternative. China's Yinfa No. 42 ban on RMB-linked stablecoins is backed by an e-CNY with 2.25 billion wallets and ~$2.37 trillion in cumulative transactions. But even with this scale, adoption challenges persist (declining average transaction values, the identity question from the Jan 2026 deposit-money reclassification). Jurisdictions that ban stablecoins without a CBDC of comparable scale and functionality will push users to offshore, unregulated alternatives.

Ignoring the interaction entirely. Jurisdictions that develop CBDC policy and stablecoin regulation in separate silos — without addressing conversion, interoperability, holding limit interactions, and competitive dynamics — create regulatory gaps that market participants will exploit. The EU's unresolved question of digital euro/stablecoin interoperability is a current example.

The substitution risk. If a CBDC is limited in functionality (holding limits, no programmability, restricted use cases, no DeFi integration), users who need those capabilities will migrate to stablecoins. The EU's proposed zero holding limit for businesses effectively cedes the corporate digital money market to stablecoins. Brazil's Drex pivot — from a programmable CBDC that would absorb stablecoin use cases to a centralised collateral-management / lien-reconciliation system after the Hyperledger Besu platform was decommissioned in November 2025 — expanded the functional gap that stablecoins fill.

Delayed CBDC launch creating stablecoin lock-in. The digital euro's projected ~2029 issuance means MiCA-regulated euro stablecoins will have operated for years before the CBDC arrives. Network effects, merchant integration, and user habits built around stablecoins may reduce the digital euro's adoption potential. The Qivalis bank consortium stablecoin (mid-2026 launch) will be roughly three years ahead of the digital euro.

Launching a CBDC the market does not want (Nigeria). The eNaira launched in 2021 but remained largely dormant (98.5% of wallets inactive after one year); by 2025-26 the CBN had pivoted toward wholesale CBDC and an official/private stablecoin (cNGN). A premature, internet-only, surveillance-heavy retail CBDC can fail to displace cash or stablecoins, leaving the central bank to concede the use case to private money.

Privacy asymmetry. If a CBDC offers less privacy than stablecoins, privacy-conscious users will prefer stablecoins. China's "controllable anonymity" framework provides less privacy than offshore stablecoins — contributing to continued offshore stablecoin usage. Conversely, if a CBDC offers more privacy (as the EU digital euro's offline mode aspires to), the resulting AML/CFT compliance gap must be addressed.

6. Recommended Framework for CBDC-Stablecoin Coexistence

6.1 Design Principles

Principle 1: Preserve the singleness of money. All forms of domestic-currency digital money — CBDC, regulated stablecoins, tokenised deposits — should be convertible at par under normal conditions. The BIS foundational principles report established this as a baseline requirement. Regulators should specify par conversion obligations in legislation.

Principle 2: Regulate by function, not by form. A digital payment instrument that stores value, facilitates transfers, and denominates in the sovereign currency should face equivalent regulatory requirements regardless of whether it is issued by the central bank, a commercial bank, or a licensed stablecoin issuer. Consumer protection, AML/CFT, and data protection obligations should be symmetric.

Principle 3: Define the division of labour explicitly. Regulators should clearly articulate which use cases are served by CBDC, which by regulated stablecoins, and which by both. The Singapore model — wholesale CBDC for institutional settlement, stablecoins for programmable payments, PBM as a universal protocol — provides a template.

Principle 4: Build interoperability infrastructure before launch. Conversion APIs, settlement bridges, and interoperability standards between CBDC and stablecoins should be developed during the CBDC design phase, not retrofitted after launch. The BIS's Project Aurum demonstrated this is technically feasible.

Principle 5: Align holding limits and regulatory caps. If a CBDC has holding limits, regulators must consider the interaction with stablecoin holding limits (or lack thereof). Misalignment creates arbitrage incentives that can undermine financial stability objectives.

6.2 Conversion and Interoperability Requirements

Regulators should consider mandating:

1. Seamless conversion infrastructure. CBDC wallets and stablecoin wallets should support direct conversion without requiring an intermediate step through commercial bank deposits. This requires standardised APIs and settlement protocols.

2. Real-time settlement. Conversion between CBDC and regulated stablecoins should settle in real time or near-real time (sub-second), consistent with the instant settlement expectation for both instrument types.

3. Fee caps on conversion. Conversion fees between CBDC and regulated stablecoins should be capped to prevent friction from creating de facto segmentation of the money supply.

4. Cross-form acceptance. Merchants required to accept CBDC should also be required to accept regulated stablecoins (and vice versa), or at minimum be provided with infrastructure that automatically converts received payments to the merchant's preferred form.

6.3 Reserve Requirements for Stablecoins in a CBDC World

Where a CBDC exists, regulators should consider:

The UK BoE's proposal for systemic stablecoins — a split between unremunerated Bank of England accounts and short-term government debt — provides a pragmatic transitional model that can evolve toward higher CBDC reserve ratios as a digital pound is deployed (subject to the Bank's May 2026 signal that it may ease the proposed limits).

6.4 Consumer Protection Parity

Regulators should ensure equivalent protections across both forms:

7. Decision Matrix for Regulators

The following matrix assists regulators in determining the appropriate coexistence model based on their jurisdiction's circumstances:

Decision Criteria

Regulators should answer these five questions to determine which model fits:

1. Is there political will to issue a CBDC? If no (or banned) -> Model C or F.
2. Is the central bank technically capable of building and operating CBDC infrastructure? If limited -> Model C or early-stage Model D.
3. Is the stablecoin market already significant domestically? If yes -> Model B, D, or F (accommodation). If no -> Model A or E (pre-emption).
4. What is the primary use case for digital sovereign money? If payments -> Model A or B. If programmable finance -> Model D or E. If dollar/currency access -> Model C.
5. Can the jurisdiction enforce a stablecoin ban effectively? If yes -> Model A viable. If no (porous borders, VPN usage) -> Models B, C, D, or F preferred.

Verification Notes

This is a refresh synthesis: every CBDC fact below is mirrored from .claude/cbdc-frameworks-fact-matrix.json (the canonical per-jurisdiction source of truth for all 20 jurisdictions). No new web research was conducted this cycle. Stablecoin market-size figures (market cap, transaction volume) are carried forward from prior web-verified research and remain flagged as self-reported by their commercial sources.

Facts Mirrored from the Fact Matrix (June 2026 refresh)

Stablecoin Market-Size Figures (self-reported, carried forward — NOT re-verified this cycle)

• Total stablecoin market cap ~$312-320B (early 2026) — varies by commercial source (CoinGecko, DefiLlama, KuCoin); flagged as a range.
• 2025 on-chain stablecoin transaction volume $33 trillion (Bloomberg / Artemis Analytics) — self-reported by commercial analytics providers.
• IMF "Understanding Stablecoins" (December 2025) and BIS Project Aurum — institutional sources, carried forward from prior verification.

Items Not Verified in the Matrix

• The GENIUS Act's specific interaction with a future U.S. CBDC (should the executive ban be revoked or the proposed 2030 statutory moratorium be enacted) is not addressed in the Act itself.
• Whether the Qivalis consortium euro stablecoin has formally launched is not confirmed (launch planned mid-2026); not a matrix fact.
• Canada's Stablecoin Act is enacted but not yet in force; the operative regime for live CAD stablecoins in the interim is the provincial Alberta framework.

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Last updated: 2026-06-04