Innovations in Cross-Border Payments: CBDCs, Instant Payment Rails, and Stablecoins

Cross-border payments involve financial transactions where the payer and payee reside in different jurisdictions. Traditional cross-border settlements rely on correspondent banking networks, which involve multiple intermediaries, high fees, currency conversion delays, and operational friction across time zones. Emerging digital financial architectures use Central Bank Digital Currencies (CBDCs), interlinked instant payment systems, and fiat-backed stablecoins to enable real-time, low-cost international settlements.

Structural Inefficiencies in Traditional Correspondent Banking

Correspondent Banking Mechanism

• Traditional international payments move through a network of correspondent banks using Nostro and Vostro accounts.
• SWIFT (Society for Worldwide Interbank Financial Telecommunication) provides the standardized messaging layer for international transactions without settling the underlying funds directly.
• Transactions pass through multiple intermediary banks when direct bilateral banking relationships do not exist.

Key Structural Frictions

• High Transaction Costs: Intermediary banks charge routing fees, currency exchange markups, and processing costs, increasing the total expense for small-value remittances.
• Delayed Settlement: Processing delays occur because correspondent banks operate within disparate time zones, national holidays, and local RTGS operational cut-off hours.
• Counterparty and Settlement Risk: Extended settlement cycles increase credit and liquidity risks between financial intermediaries.
• Limited Transparency: Senders often lack real-time end-to-end visibility regarding transaction status and deducted intermediary charges.

Central Bank Digital Currencies in Cross-Border Settlement

Multi-CBDC (mCBDC) Models

• Model 1 (Compatible Standards): Central banks retain separate domestic CBDC systems but harmonize technical standards and regulatory rules to ease cross-border exchange.
• Model 2 (Interlinked Systems): Domestic CBDC platforms connect directly through shared technical interfaces or a common messaging hub.
• Model 3 (Single Shared Platform): Central banks issue and settle multiple national CBDCs on a unified, multi-currency distributed ledger platform.

Major Global CBDC Cross-Border Pilots

Bilateral and Multilateral Instant Payment Rails

Interlinking Fast Payment Systems (FPS)

• Fast payment rails enable instant, round-the-clock funds settlement directly between bank accounts or digital wallets.
• Bilateral linkages connect two sovereign real-time retail systems directly without correspondent intermediary layers.
• The G20 Roadmap for Enhancing Cross-Border Payments prioritizes the linkage of national fast payment systems to lower global remittance costs.

Key FPS Linkages and Multilateral Hubs

• UPI-PayNow Linkage: Launched in February 2023 between India and Singapore, enabling instant cross-border remittances using mobile numbers or Virtual Payment Addresses.
• India’s Global Bilateral Push: NPCI International Payments Limited expands UPI cross-border acceptance and interlinkages with partner countries, including the UAE, Bhutan, Nepal, Sri Lanka, and Mauritius.
• Project Nexus: Developed by the BIS Innovation Hub to connect multiple domestic fast payment systems into a single multilateral network, standardizing cross-border retail payments across Southeast Asian nations and partner countries.
• Project Mandala: Explores automating policy and regulatory compliance across cross-border payment flows using embedded architecture.

Stablecoins and Tokenized Assets

Classification and Mechanics

• Fiat-Collateralized Stablecoins: Digital tokens issued on public or permissioned blockchains that maintain parity with fiat currencies through audited reserve assets like cash and short-term government treasury bills (for example, USDT and USDC).
• Crypto-Collateralized Stablecoins: Tokens backed by excess cryptocurrency collateral locked in automated smart contracts (for example, DAI).
• Algorithmic Stablecoins: Uncollateralized or partially collateralized tokens that maintain price stability through automated supply-adjusting algorithms.

Comparison of Cross-Border Payment Rails

Regulatory Challenges and Global Frameworks

Financial Integrity and Compliance

• AML/CFT Standards: Cross-border digital asset transactions must comply with Financial Action Task Force (FATF) guidelines, including the Travel Rule which mandates sharing originator and beneficiary information.
• Foreign Exchange Controls: Instant transfers require compliance checks under foreign exchange management frameworks, such as India’s Liberalised Remittance Scheme (LRS).
• Data Sovereignty and Privacy: Cross-border payment networks must reconcile data localization mandates with cross-border transaction monitoring requirements.

Financial Stability Risks

• Unregulated cross-border stablecoins can lead to currency substitution in emerging market economies with volatile domestic currencies.
• Sudden cross-border capital flights can accelerate through 24/7 digital channels during financial stress.

Important Facts

• The Financial Stability Board coordinates the G20 Roadmap for Enhancing Cross-Border Payments to improve speed, cost, transparency, and access.
• The Bank for International Settlements Innovation Hub leads multilateral CBDC experiments, including Project mBridge, Project Dunbar, Project Agorá, and Project Mariana.
• Project mBridge reached the Minimum Viable Product stage in 2024, involving central banks of China, Hong Kong, Thailand, UAE, and Saudi Arabia.
• Project Agorá tests tokenized central bank money and tokenized commercial bank deposits across major reserve currency jurisdictions.
• Project Nexus is an initiative of the BIS Innovation Hub designed to connect national fast payment systems through a standardized multilateral gateway.
• India and Singapore established the first bilateral real-time payment linkage between fast payment systems via UPI and PayNow in 2023.
• ISO 20022 is the universal financial messaging standard adopted globally to enable rich data exchange in cross-border payments.
• Atomic settlement refers to a mechanism where the transfer of one asset occurs only if the transfer of another asset occurs simultaneously, eliminating settlement risk.
• Nostro accounts are domestic bank accounts held in a foreign bank in foreign currency; Vostro accounts are foreign bank accounts maintained at a domestic bank in local currency.
• FATF Recommendation 16, known as the Travel Rule, mandates virtual asset service providers and financial institutions to obtain and transmit customer details during funds transfers.