Finexer Is Emerging as the Open Banking Infrastructure UK SaaS Platforms Are Building On

Most infrastructure categories look obvious in hindsight. Open Banking in the UK is at that inflection point now.

24 billion successful API calls were processed across the ecosystem in 2025. Payment initiation volumes grew 53% year-on-year. An independent report from Open Banking Limited and EY puts the current annual economic value at £2bn, with a verified pathway to £43bn at full maturity.

The category is not emerging. It is compounding. And the platforms that embed the right infrastructure layer now are building a structural advantage that will be difficult to close later.

A market built for institutions

The first generation of Open Banking infrastructure was designed for large financial institutions. That made commercial sense at the time. It also created a gap that has not closed.

Accounting platforms, payroll providers, legal technology firms, and ERP vendors all had clear product reasons to embed financial connectivity. Real-time bank data upto 7 years. Account-to-account payments. Automated reconciliation. Bank-based verification. The demand was there.

But enterprise providers were structured for procurement cycles and compliance teams that most product-led businesses simply do not have. Integration timelines ran into months. Pricing eroded SaaS unit economics. Compliance overhead sat outside what most engineering teams could manage independently.

The cost of that gap is quantifiable.

£19.6bn lost annually in card processing fees that account-to-account payments directly replace. £28bn in working capital locked in payment delays. 94% of UK firms still without access to real-time financial data. Open Banking Limited and EY, 2026

These are not abstract inefficiencies. They show up in margins, in cash cycles, and in product decisions deferred because the infrastructure to support them was not accessible on workable terms.

That is the gap Finexer was built to close.

Infrastructure that fits how platforms actually build

Finexer is an FCA-authorised Open Banking infrastructure provider. It gives UK mid-market platforms a single API covering the three layers that matter most for product teams embedding financial capability.

Account Information Services: Access real-time transaction data, account balances, and up to 7 years of historical financial data across 99% of UK banks through a single API.

Payment Initiation  Instant account-to-account payments and bulk payouts. Replaces card rails carrying 1.5 to 3.5% per transaction,saving upto 90% in transactional costs with settlement that does not wait days.

Data Enrichment  Standard Open Banking transaction data enriched with verified merchant intelligence, spending categories, and billing patterns. Processed in under 100ms across a database of 100M+ merchants.

Platforms keep full control of their product and user experience. Finexer handles what sits underneath: bank connectivity, FCA compliance, and the data layer. The result is a compliant, production-ready integration without the overhead that historically made it a boardroom risk rather than a product decision.

Where most Open Banking integrations take months, Finexer deploys in weeks. Pricing tracks actual API consumption rather than committed volumes, so costs scale with the platform, not against it.

The demand signal

Finexer was ranked 32nd on the Sifted 100 UK and Ireland 2026 Leaderboard by audited two-year revenue growth, placing it among the fastest-growing startups in the region. Fintech is the top-performing vertical on that list for the third consecutive year.

The growth has been demand-led. Product teams across accounting, payroll, and legal technology are actively seeking Open Banking infrastructure that fits their development timeline and does not require them to build compliance architecture independently. That pull is what the inbound pipeline reflects.

“The OBL and EY report confirms what we see every week. The regulatory catalysts are materialising. We built Finexer specifically for this window and the market is responding.” – Ravi Ranjan, Co-Founder and CEO, Finexer

Finexer is backed by SFC Capital and British Business Bank and is currently in its growth round.

The next phase of Open Banking is not about consumer adoption. It is about which platforms embed the right infrastructure layer before it becomes a baseline expectation.

The Scaleups window is open. For the platforms moving now, the compounding advantage is already building.