Central Banks of UK, Singapore, and Thailand Complete Cross-Border FX Settlement Trial

The Bank of England, the Monetary Authority of Singapore, and the Bank of Thailand have successfully concluded a joint experiment to synchronize foreign exchange settlements across their respective national systems. Known as Project Meridian FX APAC, the trial demonstrated that central banks can coordinate cross-border currency trades between conventional real-time gross settlement networks and blockchain-based ledgers.[1][2]

The findings, published across three comprehensive technical and policy reports on November 13, offer a technical blueprint for bridging disparate national payment infrastructures. Crucially, the architecture allows different jurisdictions to achieve interoperability without requiring them to abandon their legacy systems or adopt a single, unified technology stack.[2][3]

This trial addresses a structural vulnerability that has plagued international finance for years. When two currencies change hands across borders, the settlement legs typically move through separate domestic networks with different operating hours, messaging formats, and finality rules, creating a dangerous lag between payments.[1][4]

The Trillion-Dollar Settlement Gap

This structural delay exposes financial institutions to severe counterparty risks. According to the Bank for International Settlements' 2025 Triennial Central Bank Survey, more than $1.4 trillion—equivalent to 1.8 trillion Singapore dollars, or roughly 10 percent of the average daily foreign exchange settlement recorded in April 2025—remained fully exposed to settlement risk.[1]

This exposure, historically known as Herstatt risk, represents the danger that one party to a currency trade delivers its funds while the counterparty defaults before delivering the other side of the transaction. Project Meridian FX APAC sought to eliminate this window by testing a payment-versus-payment mechanism across international borders.[1][2]

Under a strict payment-versus-payment arrangement, the transfer of one currency occurs if and only if the matching transfer in the second currency is also successfully executed. The three central banks tested whether this synchronization could be reliably achieved when one leg settles on a conventional central bank system and the other on a tokenized network.[4][5]

The core challenge of the experiment was coordinating these simultaneous transfers across materially different technological architectures. The trial linked simulated versions of the central banks' existing real-time gross settlement systems with newer distributed ledger technology environments, testing the boundaries of cross-chain communication.[2][5]

Bridging Legacy and Blockchain Networks

Partior, a global clearing and settlement infrastructure provider founded in 2021, acted as the technical partner for the initiative. The firm developed and integrated a single Synchronisation Operator prototype designed to act as the coordinating layer between the disparate national networks, managing the complex cryptography required to lock funds simultaneously.[1][3]

This synchronization operator did not hold the funds itself, maintaining a non-custodial role throughout the transaction lifecycle. Instead, it orchestrated the messaging and cryptographic locking of funds across the national systems to ensure atomic settlement, meaning the trade either completed entirely or failed without moving any capital.[2][3]

"Project Meridian FX APAC successfully demonstrated that synchronisation can work across diverse wholesale settlement systems, making cross-border FX safer and more efficient while preserving trust in central bank money," said Pucktada Treeratpituk, director of the payment systems and financial technology policy department at the Bank of Thailand.[3]

The insights gained on technical integration, operating models, and regulatory considerations establish a practical foundation for modernizing wholesale settlement infrastructure. The central banks noted that the operator's role was significantly streamlined when the underlying national systems natively supported authorized third-party access and automated fund reservation.[2][3]

Optimizing Bank Liquidity

Where those native capabilities were absent, the project relied on system-specific technical adaptations, which added operational complexity to the settlement process. Beyond individual trades, the central banks also tested multilateral net foreign exchange settlement, a process that allows financial institutions to offset their payment obligations across multiple counterparties.[1][2]

By calculating the net difference of all trades before moving the funds, multilateral netting drastically reduces the total amount of liquidity banks need to hold in their accounts to settle their daily operations. The experiment proved that a synchronization operator could combine this liquidity-saving technique with the security of atomic settlement.[1][3]

This dual capability is particularly valuable for commercial banks, which currently face high capital costs when pre-funding accounts in multiple jurisdictions to facilitate international trade. Combining multilateral netting with linked settlement helps banks use their cash reserves more efficiently while simultaneously eliminating the risk of a one-sided default.[1][4]

To validate the architecture's resilience, the project simulated a series of exception scenarios that routinely disrupt live cross-border environments. The test cases included transactions initiated with insufficient funds, trades featuring invalid account identifiers, and sudden infrastructure outages at the central bank level.[2][3]

Simulating Real-World Failures

In each simulated crisis, the Synchronisation Operator successfully maintained the integrity of the payment mechanism. The system either completed the settlement through alternative routing or fully unwound all legs of the transaction, ensuring that no bank was left out of pocket due to a technical failure on the other side of the world.[2][3]

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While the technical trial proved successful, the participating institutions emphasized that technical atomicity does not automatically establish legal settlement finality across different jurisdictions. The project examined the complex legal, regulatory, and oversight requirements necessary for implementing synchronized settlement in a live commercial environment.[2][3]

The policy analysis was informed by input from two observer central banks, the Reserve Bank of Australia and Bangko Sentral ng Pilipinas, which participated in the trial. Their involvement highlights the broader regional interest in establishing a unified framework for cross-border transactions across the Asia-Pacific corridor.[3]

The Bank of England, established in 1694, plans to use the findings to inform its development of a live synchronization interface, which it intends to launch for commercial use in 2028. The British central bank views the technology as a critical step in modernizing the pound sterling's role in global wholesale markets.[2][3]

The Path to Commercial Deployment

"Project Meridian FX APAC provides practical evidence of how synchronised settlement could help reduce risk and improve efficiency in cross-border FX transactions," said Tom Mutton, the Bank of England's executive director of payments, innovation, and fintech.[2][3]

Mutton added that the results provide a strong foundation for further collaboration as the institutions explore how this approach could be developed toward real-world use. The three central banks originally announced their collaboration on this specific architecture in November 2025.[2][3]

However, the Monetary Authority of Singapore and the Bank of Thailand clarified that their participation in the trial does not constitute a formal commitment to implement the specific architecture tested. Further technical work will be required before the system can handle live commercial volumes.[2][3]

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Future phases of testing are expected to include delivery-versus-payment scenarios for securities, a wider range of operating and liquidity conditions, and closer collaboration with private-sector market participants. The central banks' push to modernize wholesale settlement comes as private-sector alternatives increasingly position themselves as faster rails for cross-border transfers.[2][4]

Competing With Private Alternatives

Stablecoins and privately managed blockchain networks have gained traction by promising the exact atomic settlement and round-the-clock availability that legacy systems currently lack. By proving that legacy central bank money systems can achieve the same synchronized coordination promised by decentralized finance, regulators are defending the primacy of sovereign currency in global trade.[4][5]

The integration of distributed ledger technology into traditional finance represents a significant convergence of two previously distinct ecosystems. As tokenized foreign exchange settlement matures, commercial banks will increasingly demand the ability to move sovereign currency across borders with the same speed and finality as digital assets.[4][5]

The findings establish a practical foundation for modernizing international finance, proving that global interoperability does not require the world to agree on a single technological standard. Instead, a well-designed synchronization layer can bridge the gap between the financial infrastructure of the past and the tokenized networks of the future.[2][4]