In July 2023, the U.S. Federal Reserve launched FedNow, an instant payments system that promised to modernize the country's financial transactions. However, nearly three years later, less than one-fifth of eligible financial institutions are able to send a payment through this network. It's not a lack of interest: 73% of banks and credit unions say their legacy core banking system is the main obstacle. These platforms, designed in the 1970s and 1980s for nightly batching, cannot meet the real-time, 24/7 availability, ISO 20022 messaging, and high concurrency requirements demanded by FedNow and The Clearing House's RTP network.
The problem is structural: the large core banking providers – Fiserv, Jack Henry and FIS – control more than 70% of the market with systems that cannot be patched to support instant payments. Replacing them costs tens of millions of dollars and takes five to ten years, an unfeasible option for most community banks and cooperatives. Today's solutions—custom integrations, waiting for vendors, or migrating the core—are slow, expensive, or proprietary. There is no open, neutral, and reusable middleware that connects any legacy core to both networks.
Brazil faced a similar challenge with PIX, its instant payments system launched in 2020. There, banks were required to process transactions in real-time using ISO 20022 without modifying their z/OS mainframes. The solution was a middleware architecture in five layers: an anti-corruption layer to translate formats, a shadow ledger to maintain balances in real time even when the core is offline, a synchronous-asynchronous bridge to handle 20-second response times, a Saga orchestration to manage distributed transactions, and a processing engine with idempotency controls. The crucial thing is that about 85% of this infrastructure is independent of the core provider and the payment network; only the remaining 15% require specific adapters.
That same architecture has been adapted to the American context with the open-source OpenFedNow framework, available under the Apache 2.0 license. It allows any institution with a Fiserv, Jack Henry, or FIS core to connect to both FedNow and RTP without changing their core system. Being dual-rail by design, adding the second network only involves adding the corresponding Layer 1 gateway, reusing the rest of the middleware. This solves the main technical bottleneck and paves the way for more than 8,300 financial institutions to access instant payments.
The digital transformation of the financial sector is not limited to payments. Companies that manage to modernize their legacy systems gain operational efficiency and innovation capacity. This is where companies like Q2BSTUDIO bring application development expertise as they integrate legacy systems with modern platforms. Whether it's building custom adapters, deploying AWS and Azure cloud services to ensure high availability, or deploying artificial intelligence to predict transaction spikes, the right technical knowledge makes all the difference.
In addition, cybersecurity becomes critical by exposing old systems to open networks. Well-designed middleware should include access controls, encryption, and anomaly detection. Business intelligence services solutions with power bi enable entities to monitor transaction performance in real-time and make data-driven decisions. Even automation with AI agents can handle reconciliations and alerts without human intervention.
The path to mass adoption of instant payments is through shared, reusable, and neutral infrastructures. It is not a matter of replacing everything, but of building layers of abstraction that allow legacy systems to coexist with the new standards. Brazil's expertise, OpenFedNow's open source, and support from companies specializing in custom software offer a viable roadmap for the thousands of U.S. banks and cooperatives that are still unable to send instant payments. The technology already exists; Now it takes willingness and collaboration to implement it at scale.
