Executive Summary

Cross-border payments still face long-standing frictions: locked-up funds in foreign accounts, settlement delays caused by cut-off times, and high FX costs. For banks and corporates operating in high-volume corridors, these inefficiencies mean trapped capital, increased operational risk, and an inability to meet customer expectations.

A Corridor Liquidity Hub addresses these challenges by offering Liquidity-as-a-Service (LaaS). By pooling liquidity from participating institutions in a neutral, jointly governed structure, banks no longer need to pre-fund accounts worldwide. Instead, they can access liquidity on demand, with instant FX conversion and settlement available around the clock. This improves capital efficiency, reduces costs, and strengthens operational resilience. Crucially, this model can work alongside—rather than replacing—public and private initiatives such as BIS Project Nexus, which focuses on messaging and interoperability between domestic instant payment systems.

The Current Cross-Border Reality

Despite innovations in domestic payments, the cross-border experience remains slow, fragmented, and costly. The correspondent banking model — where payments move through multiple intermediaries — forces participants to:

  • Pre-fund accounts in multiple currencies across the globe, tying up working capital.
  • Manage cut-off times and time zone mismatches that create settlement delays.
  • Absorb unpredictable FX spreads that reduce margins and complicate reconciliation.
  • Handle operational complexity when disputes or compliance checks arise mid-flow.

The result? High operational overhead, reduced liquidity flexibility, and a customer experience that lags behind the instant payment norms of domestic markets.

The Shift Toward Regional & Corridor-Based Solutions

Industry momentum is moving toward regional and corridor-first models — where high-volume payment routes between two or more countries are optimised independently before being scaled globally. This approach allows for tailored governance, liquidity management, and regulatory alignment.

One example is BIS Project Nexus, which links domestic instant payment systems (IPS) through a light core infrastructure. Nexus focuses on standardised messaging and routing, while each domestic IPS continues to handle its own clearing, settlement, and liquidity management. This design reduces cost and complexity by reusing existing IPS infrastructure.

A Corridor Liquidity Hub can operate alongside such interoperability layers, addressing a different part of the equation: pooled, corridor-level liquidity and on-demand FX that works across multiple IPS and rails - Liquidity-as-a-Service (LaaS). This ensures that even when liquidity is managed separately inside each domestic system, participants still benefit from a shared, always-available pool — maximising capital efficiency and reducing the need for redundant pre-funding across multiple markets.

The Corridor Liquidity Hub Model

A Corridor Liquidity Hub is a neutral, jointly governed platform where participants contribute currency-specific liquidity to a shared pool. This arrangement significantly reduces the need for each bank to hold balances in every market. Through LaaS APIs, institutions can draw liquidity on demand and settle payments instantly, supported by always-on FX conversion. Operating independently of cut-off windows or time zones, the hub works as an overlay to existing payment rails, allowing participants to benefit from instant liquidity while retaining their preferred settlement networks.

In the traditional model, cross-border payments involve multiple intermediaries, each holding pre-funded accounts, with settlement delays and FX conversion often occurring at the end of the process. With a Corridor Liquidity Hub offering Liquidity-as-a-Service (LaaS), banks exchange payment messages via domestic systems, while liquidity and FX are handled instantly by the hub, operating 24/7.

In some respects, corridor hubs resemble a domestic central bank’s role in enabling rapid settlement—they hold funds and redistribute liquidity—but these hubs are not monetary authorities. They do not issue currency or set policy; rather, they operate as high-trust utilities, potentially under central bank oversight. And unlike domestic systems, FX is a core function in cross-border contexts.

How Corridor Liquidity Hubs Complement BIS Nexus

In this model, the Corridor Liquidity Hub operates as the bottom layer in a two-tier structure. The top layer — BIS Nexus — handles the messaging and interoperability between domestic instant payment systems (IPSs). The bottom layer — the Corridor Liquidity Hub — connects to the same IPSs shown in the top layer, ensuring they have immediate access to pooled cross-border liquidity and real-time FX to settle transactions instantly.

This IPS-connected approach means the hub is not just working with individual banks or PSPs but directly supporting the IPS infrastructure in each participating country. When a cross-border payment is initiated, BIS Nexus transmits the instruction between IPSs, and the Corridor Liquidity Hub ensures the sending IPS has the required liquidity available at that exact moment. This design aligns settlement capability with the speed of the messaging layer, enabling 24/7, on-demand LaaS for all participants in the corridor.

In BIS Nexus, competitive FX quotes ensure end-users receive the best available conversion rates at the time of the transaction. In the Corridor Liquidity Hub context, this would mean that the hub could integrate with multiple FX liquidity providers or market-makers to offer competitive, real-time rates for settlement between currencies in the corridor. This approach would not only ensure fairness and transparency for participants but could also drive down FX costs by fostering competition, much like Nexus does at the user-facing layer.

Business Benefits

Corridor Liquidity Hubs deliver measurable benefits through LaaS. They release trapped capital by reducing pre-funding requirements, enable instant settlement at any time of day, and provide predictable FX costs through transparent, competitive real-time rates. They also enhance resilience by allowing payments to flow through multiple settlement rails.

Implementation Considerations

Building such a hub requires careful governance to ensure neutrality and regulatory compliance. Integration with existing systems can be achieved through LaaS APIs and ISO 20022 messaging standards. Risk management must be embedded, with real-time monitoring, credit limits, and collateralisation to protect all participants.

RS Software’s Role in Enabling the Corridor Strategy

RS Software’s RS DigitalEdge™ has been purpose-built with advanced liquidity management at its core. The platform uses a shadow ledger approach to track balances in real time and applies mechanisms such as limit management and net debit caps to ensure secure and efficient settlement. To support transparency, it generates participant-level reconciliation reports at scheduled cut-offs, with files automatically created and distributed whenever thresholds are met.

Importantly, RS DigitalEdge™ is already designed for multi-currency liquidity services, making it readily extensible to a Corridor Liquidity Hub environment. This means financial institutions can access seamless cross-border settlement and liquidity-as-a-service (LaaS) at an optimal price point. By bridging today’s domestic payment efficiencies with tomorrow’s global, hub-based model for 24/7 liquidity and FX, RS Software is positioned as a key enabler of the Corridor Strategy.

Closing Note

In the foreseeable future, corridor hubs are most likely to emerge at the regional level, targeting high-volume routes first. Interoperability between hubs is possible if they share standards, governance, and mutual liquidity agreements, potentially forming a network of connected hubs.

The main obstacles to developing corridor hubs are political and regulatory rather than technical. Regulatory authorities are cautious about allowing foreign-held liquidity, there are concerns about settlement risk, and FX markets are often heavily regulated. Large correspondent banks may have little incentive to support a model that could erode their revenue from spreads and pre-funding. Furthermore, establishing a hub requires complex, multi-jurisdictional agreements, capitalisation, and strong political will.

The future of cross-border payments will be shaped by advances in both interoperability and liquidity. BIS Nexus addresses the messaging challenge, while Corridor Liquidity Hubs—delivered through LaaS—address the liquidity and capital efficiency challenge. Together, they have the potential to enable truly instant, cost-effective, and scalable cross-border payments.