Open banking has become a mainstream expectation. In the UK alone, open banking user connections stood at 18.81 million in June 2026, and more than one billion open banking payments have been initiated since launch, according to Open Banking Limited. Account Information Services let customers securely share balances and transaction histories, supporting a growing range of personalized financial tools, while institutions that remain in closed proprietary systems increasingly find themselves cut off from that activity. Connecting a traditional core banking system to this open environment is difficult, however, and a category of middleware and orchestration platforms has emerged to do it.
These platforms sit between core banking infrastructure and the wider ecosystem of fintech partners, regulators, and corporate clients, providing a common environment for API management, consent orchestration, and partner oversight. Rather than replacing the core, they add a layer on top, aiming to let a bank take part in open banking without rebuilding the systems that run its ledger. Offerings in this category range from specialist vendor products to frameworks that larger banks assemble themselves, but they share a common purpose and a common set of trade-offs.
Continue reading to explore:
- Connecting legacy banking systems to open APIs without replacing core infrastructure
- Managing customer consent, data access, and regulatory compliance
- Securing API integrations and controlling third-party risks
- Expanding fintech partnerships and corporate treasury services through open banking
- Using analytics and audit trails to monitor activity and improve oversight
Bridging legacy cores and the API economy
Most core banking systems predate the API economy and were designed for stability rather than external connectivity, which often creates silos that slow the launch of new digital services. Orchestration platforms address this by separating the customer experience layer from core logic and data. Development teams can build and test against a sandbox without touching the live ledger, and the platform translates modern API requests into the formats that older host-to-host systems understand.
Centralizing these connections replaces a patchwork of point-to-point links with a single point of control over an institution’s digital interactions. The underlying complexity remains, and much of it moves into the new layer. A middleware platform adds its own integration work and creates a dependence on the platform provider, which institutions weigh against the cost and risk of modifying the core directly.
Both risks are real. Nine major UK banks and building societies reported at least 158 IT failure incidents between January 2023 and February 2025. According to Treasury Committee data reported by FStech, the most common causes included third-party supplier issues and disruptions from system changes.
Consent and data governance
Consent management is central to open banking, because data moves only with the account holder’s permission. Platforms in this category typically provide a consent dashboard that lets customers grant, review, and revoke permissions in real time, alongside a tamper-evident audit trail of every data-sharing event. Regulators are making such dashboards standard. Under the EU’s Payment Services Regulation deal reached in November 2025, customers will get a dashboard to monitor and manage the permissions they have granted for access to their data.
The orchestration layer enforces time-bound and scoped authorizations, so a third-party provider reaches only the specific data a customer has approved and only for as long as the permission lasts. Handled well, this supports both regulatory compliance and customer confidence, since people can see and control how their information is used. The quality of these controls varies between implementations, and much of the ongoing burden lies in keeping consent records accurate and making revocation effective across every connected party.
Securing open API surfaces
Opening internal systems to external partners enlarges the attack surface, so security is a defining concern for any platform in this space. API gateways commonly serve as the single controlled entry point for external traffic, enforcing encryption of data in transit, while encryption at rest is handled by the underlying storage and infrastructure. Maker-checker controls, which require a second person to approve sensitive administrative actions, guard against both error and internal fraud, and real-time monitoring looks for anomalous patterns in API usage. Deployment options differ.
Some institutions run these platforms on-premises for maximum control, while others use cloud hosting for scalability, a choice shaped partly by data-residency rules that vary by jurisdiction. None of this makes the risk disappear. A shared API layer concentrates a large volume of sensitive traffic in one place, so its security and availability become a dependency for the whole institution. European regulators treat that kind of concentration as a systemic issue. In November 2025, the European Supervisory Authorities designated 19 critical ICT third-party providers for direct oversight under DORA, weighing how heavily financial entities rely on each one.
Meeting regulatory demands
Regulation is among the heaviest pressures in banking, and open banking adds to it. Frameworks such as PSD2 in Europe and a range of regional mandates set detailed requirements for how data is shared and secured. Orchestration platforms often provide APIs pre-configured to regional standards, which can reduce the development effort and technical debt involved in adapting legacy systems to each new rule. Automated reporting and detailed interaction logs help keep an institution audit-ready. For smaller and mid-tier institutions, a ready-made framework can offer connectivity and security comparable to larger competitors at a lower build cost, which is part of its appeal. Pre-built compliance has limits, though, because mandates differ by market and keep changing. Even within Asia-Pacific, the Cambridge Centre for Alternative Finance found that of 16 jurisdictions studied, 8 take market-driven approaches to open banking and 6 favor regulation-led ones, with the remaining two still at an early stage of adoption. Configuration and ongoing maintenance therefore remain the institution’s responsibility.
Enabling partner ecosystems
A platform model lets a bank offer more than its own deposit and lending products. By hosting a marketplace of third-party fintech services, such as automated investment tools, insurance products, or budgeting applications, an institution can act as a curator of services without building each one in-house. Partnerships of this kind are already common. In a 2025 Digital Banking Report survey of banks and credit unions, sponsored by Q2, 64% of organizations said they had already established partnerships with fintechs.
Middleware handles the onboarding of partners, and a developer portal with documentation and a sandbox lowers the barrier for external teams to build integrations. For the bank, the attraction is new revenue through partnership arrangements, higher retention from a broader set of services, and maintaining the primary customer relationship while governing authorized access to customer data.
Serving corporate and treasury needs
Corporate clients are among the most demanding users of open banking, since they expect their own systems to connect directly to their banks. Treasury teams rely on real-time data to manage liquidity, currency exposure, and payments, and orchestration platforms can link a bank’s infrastructure to corporate ERP software. That connection reduces manual file transfers and reconciliation, lowers error rates, and gives treasurers a current view of cash positions across the business.
Real-time payment initiation over pay-by-bank rails can reduce transaction fees and speed settlement, and instant rails are carrying growing value. In the third quarter of 2026, the US FedNow Service settled about 6.4 million payments worth roughly $371 billion, an average value of $58,161 per payment. The quarter’s total value was up 35% from the previous quarter, according to Federal Reserve figures. Multi-bank aggregation lets a corporate client view accounts held at several institutions through one interface.
Visibility and audit
The volume of activity passing through an open platform generates data that institutions can use for oversight and planning. Analytics and data-lake capabilities let a bank monitor platform performance and usage patterns, see which third-party services attract the most activity, and detect problems early. Tamper-evident audit logs support dispute resolution and forensic analysis, and the same records give regulators and customers evidence of how data has been handled.
Service-level monitoring helps a bank hold third-party providers to agreed standards. The value of all this depends on data quality and on the skills to interpret it, and many banks still fall short. In February 2025, ECB Banking Supervision reported that banks have been slow to fix weaknesses in how they aggregate and report risk data, and that data quality problems often go unaddressed at the source.
Conclusion
For most institutions, adopting open banking is a sustained change in how the organization operates, not a one-off project. It calls for an honest assessment of existing infrastructure, usually a cross-functional team to oversee new API gateways while meeting regional mandates, and careful synchronization of the core ledger so that shared data stays accurate in real time. The central balance is between consumer empowerment and strong security, and middleware platforms are one way institutions attempt to strike it.
Whether built in-house or bought from a vendor, an orchestration layer is becoming a common feature of banking architecture, and the institutions that treat consent, security, and auditability as foundations tend to sustain trust as the model matures
