The Complete Stack: e-CNY, mBridge, and the Architecture of Monetary Optionality

I. Introduction

The standard Western reading of China's dual circulation strategy locates it inside trade economics: domestic demand replaces export dependency; self-sufficiency reduces vulnerability to supply chain disruption. This reading is not wrong. It is incomplete in a way that makes it systematically misleading for capital analysis.

The dual circulation framework, as articulated at the Fifth Plenary Session of the 19th Central Committee of the Chinese Communist Party in October 2020, contains a monetary architecture dimension that most Western analysis has not mapped with precision. The two systems developed in parallel with that strategy, the e-CNY and mBridge, are not payment modernisation projects. They are the operational infrastructure through which the dual circulation's monetary logic is implemented. Payment modernisation projects optimise for efficiency within existing monetary frameworks. The e-CNY and mBridge construct an alternative to it.

II. What Dual Circulation Actually Describes

The dual circulation strategy describes two circulation loops: the domestic principal loop and the international supplementary loop. The monetary dimension is operationally prior to the trade dimension. A domestic circulation loop that remains settled in dollar-denominated infrastructure is not, in any meaningful strategic sense, independent. China had already taken a partial step with the launch of the Cross-Border Interbank Payment System (CIPS) in 2015 and its Phase 2 expansion in 2018. As of March 2026, CIPS carries 194 direct participants and 1,597 indirect participants across 126 countries and regions, with a broader network footprint covering more than 5,100 banking institutions in 191 countries (CIPS, 2026). CIPS is a renminbi settlement system built to operate alongside the existing dollar-centric infrastructure. The e-CNY and mBridge are built to replace it.

III. The Domestic Leg: e-CNY and the Mechanics of Visibility

The e-CNY programme covers 26 specific demonstration zones across 17 provinces as of the current pilot configuration, encompassing every major Chinese economic centre including Beijing, Shanghai, Shenzhen, and Chengdu, the entirety of Hainan province as a whole-province trial, and cross-border retail pilots in Hong Kong, Macau, and merchant corridors across Laos, Thailand, Cambodia, and Singapore (Atlantic Council, 2025).

The architecture has four defining features. The two-tier issuance model issues e-CNY to 22 authorised Tier 1 institutions including, most significantly, MYbank (backed by Ant Group) and WeBank (backed by Tencent); the institutional backends of Alipay and WeChat Pay respectively, which together command over 90 percent of China's non-cash payment market (ResearchGate, 2025). The inclusion of both as Tier 1 operators means the PBoC has not positioned the e-CNY to compete with the dominant private payment infrastructure from outside. It has absorbed that infrastructure as a distribution layer for central bank money.

The tiered anonymity framework operates through four wallet tiers, from Tier 4 (mobile number only, single transactions up to RMB 2,000) through Tier 1 (full in-person identity verification, no upper limits). The PBoC operates under the stated principle of "small amounts are anonymous, large amounts are traceable." All mainland Chinese mobile numbers are, however, legally bound to a verified real-name national identity card. Privacy from commercial counterparties exists at small transaction sizes. Privacy from the state does not exist at any transaction size or wallet tier (Stanford DigiChina, 2025).

On January 1, 2026, the PBoC formally reclassified the e-CNY as deposit liabilities within the M1 and M2 monetary aggregates, removing it from the M0 cash-equivalent category and authorising it to bear interest on verified wallet balances (State Council of the People's Republic of China, 2025; China Daily, 2026). An interest-bearing e-CNY competes directly with commercial bank deposits, issued through central bank infrastructure with full PBoC ledger visibility at every tier. The reclassification dissolves the protection the two-tier architecture was explicitly designed to contain.

The adoption figures as of December 2025: 230 million personal wallets and 19.08 million corporate wallets, with cumulative transaction value reaching 19.5 trillion yuan ($2.8 trillion) across 3.57 billion total transactions (China Daily, 2026). In a single year during 2024 to 2025, the e-CNY processed approximately 4.2 trillion yuan against the 1.3 quadrillion yuan processed by commercial bank cards and private apps. The e-CNY's cumulative value represents approximately 0.2 percent of total retail payment flow (Peterson Institute for International Economics, 2026).

IV. The International Leg: mBridge and the Architecture of Settlement Optionality

Project mBridge originated as a collaborative initiative between the BIS Innovation Hub, the Hong Kong Monetary Authority, the Bank of Thailand, the Central Bank of the United Arab Emirates, and the Digital Currency Institute of the People's Bank of China. On June 5, 2024, the platform reached minimum viable product stage. On the same date, the Saudi Central Bank (SAMA) formally joined mBridge as the fifth founding participant (Saudi Central Bank, 2024). Five months later, on October 31, 2024, BIS General Manager Agustín Carstens announced the BIS's formal withdrawal at the Santander International Banking Conference in Madrid.

The geopolitical context renders the "graduation" characterisation incomplete. The BIS withdrawal occurred one week after the BRICS summit in Kazan, Russia, at which President Putin publicly cited the mBridge multi-CBDC ledger architecture as a template for a "BRICS Bridge" payment network designed to bypass US dollar dominance. Carstens addressed the association directly: "mBridge is not the BRICS bridge" (Forbes, 2024). The BIS simultaneously advanced Project Agorá, a tokenised deposit settlement initiative structured around G7 central banks and SWIFT-compatible infrastructure.

The mBridge Ledger achieves atomic settlement for wholesale cross-border transactions in approximately 7 seconds. SWIFT's ISO 20022 modernisation programme has improved delivery times with approximately 75 percent of SWIFT payments now reaching destination banks within 10 minutes (SWIFT, 2025). The US dollar accounts for 51.14 percent of total SWIFT payment value, a historic high; the Chinese renminbi accounts for 3.10 percent (SWIFT Global Currency Tracker, 2026). The BIS confirms that the dollar appears on at least one side of 89 percent of all global foreign exchange transactions (BIS, 2024). mBridge does not require dollar correspondent banking relationships at all.

By late 2025 to early 2026, mBridge had processed $55.49 billion in total cross-border settlement value across 4,047 transactions (Reuters, 2026; PYMNTS, 2026). The growth multiple from the 2022 pilot's $22 million to current scale is approximately 2,500 times by transaction value. The e-CNY accounts for 95.3 percent of total settlement volume processed on the mBridge network (Atlantic Council, 2025; Peterson Institute for International Economics, 2025).

V. The Stack Read Together: Architectural Intent and Strategic Logic

The domestic leg establishes complete visibility and programmable control over capital flows within China's monetary system. The January 2026 M1/M2 reclassification extends that control to the liability side of the commercial banking system. The international leg establishes a settlement mechanism for cross-border transactions that does not require dollar intermediation; and the 95.3 percent e-CNY share of mBridge settlement volume confirms that the international leg functions operationally as a projection of the domestic instrument.

The combined capability is domestic monetary visibility plus international settlement independence. The staging logic is architecturally legible. Each stage creates the conditions for the next. CIPS demonstrated that Chinese institutions could manage cross-border renminbi settlement at scale. mBridge demonstrated that multi-currency cross-border settlement could operate without SWIFT at wholesale speeds. The e-CNY is demonstrating that domestic monetary flows can be observed and programmed at the instrument level.

The complete stack thesis carries its own analytical limits. The e-CNY has not achieved meaningful retail adoption relative to China's existing payment infrastructure: 0.2 percent of total retail payment flow. mBridge at $55.49 billion in processed settlement value is not yet a systemic alternative to SWIFT. Neither observation weakens the architectural thesis. The question for analysis is whether the architecture being assembled is capable of scaling to systemic relevance. The growth trajectory, the participant accession pattern, the 95.3 percent e-CNY concentration in international settlement volume, and the BIS's departure at the moment of operational maturity all indicate that the question of scalability has been answered in the affirmative by the parties with the most direct information about the platform's capabilities.

VI. Implications for International Capital

International capital positioned in or adjacent to China faces three direct implications that do not require projection. First, settlement pathway exposure: entities conducting significant business with Chinese counterparties need to model scenarios in which mBridge is the settlement infrastructure. The conditions under which a Chinese counterparty or a Gulf energy exporter might prefer mBridge settlement over dollar correspondent banking already exist. Saudi Arabia's participation provides the hydrocarbon corridor that constitutes China's single largest import payment category.

Second, domestic capital flow visibility: capital operating within China's domestic economy operates in a system where the PBoC is building granular ledger-level visibility into capital flows at the individual transaction scale. The January 2026 M1/M2 reclassification extends this visibility into the deposit liability space.

Third, the participant set as strategic signal: the mBridge participant roster of China, Hong Kong, Thailand, the UAE, and Saudi Arabia covers China's primary energy supply corridor, two of the three largest sovereign wealth fund ecosystems by assets under management, and the regional financial hub through which Chinese cross-border capital flows are structured. SAMA's accession as a full participant on the day of the platform's operational launch, after sustained engagement as an observing member throughout the development phase, represents a calculated commitment to the platform's architecture.

Conclusion

The dual circulation strategy is a monetary architecture project. China holds $3.4105 trillion in foreign exchange reserves, the world's largest national stockpile (State Administration of Foreign Exchange, 2026). Dollar system participation remains substantial. The complete stack does not require China to exit the dollar system to have strategic value. Its value lies precisely in making exit optional: available when rational, unnecessary when it is not.

A monetary authority that can observe every domestic transaction at ledger level, programme the conditions under which distributed money may be spent, settle cross-border trade in central bank money entirely outside SWIFT, and do so through a system in which its own digital currency accounts for 95.3 percent of international settlement volume, occupies a structurally different strategic position than one that has not built any of those capabilities, regardless of whether it exercises the exit option in any given period.