Open Banking Grows Teeth: PSD3 Inches Closer, UK Banks Launch a New A2A Scheme, and the Core Rebuild Accelerates

The "open banking lurches onward" era is officially over. Between a near-final PSD3 text, a fresh recurring-A2A framework anchored by Britain's biggest banks, and a new chapter for BaaS, this week reset what European financial infrastructure actually looks like.

For the past three years, "open banking" has felt like a regulation in search of a business model. That changed this month. As of this week, with Money20/20 Europe in the rear-view mirror, PSD3 closer than ever to the Official Journal, and BaaS partnerships shipping live tooling, the open-banking, API and core-banking stack has stopped being a thought experiment and started becoming the default plumbing for European finance.

If you've been waiting to take the rebuild seriously, the runway just got shorter.

PSD3 and PSR: Out of the Corridor, Into the Calendar

The biggest story remains the regulatory one. As Norton Rose Fulbright and Freshfields detailed in client notes this quarter, the final compromise texts of the Payment Services Directive 3 (PSD3) and the new Payment Services Regulation (PSR) were published on April 23, 2026. The European Parliament's ECON Committee voted on May 5, with a plenary vote completed shortly after.

That leaves Official Journal publication, the formal start of the clock, pencilled in for late June or July, with a possible slip to September, according to Morrison Foerster. Once published, most rules apply roughly 21 months later (mid-to-late 2028), with the high-impact Verification of Payee obligations kicking in at about 27 months.

Why This Time Is Different

Two structural shifts deserve attention. First, the PSR converts payments rules from a directive into a regulation, eliminating divergent national transpositions and the forum shopping they enabled. Second, open-banking obligations get sharper: more granular API performance requirements, mandatory contingency mechanisms, and stronger enforcement powers vested in national competent authorities and the European Banking Authority.

In plain English: the regulator just turned "open banking" from a vibe into a contract.

UKPI Drops a Recurring A2A Framework on Money20/20's Doorstep

While Brussels was drafting, London was shipping. On the opening day of Money20/20 Europe (held in Amsterdam, June 2–4, 2026), the newly-formed UK Payments Initiative (UKPI) unveiled a new open-banking scheme specifically for recurring account-to-account (A2A) payments, FinTech Futures confirmed.

The collaborator list is the headline. Banks: Barclays, HSBC, Lloyds Banking Group, NatWest, Santander, Nationwide. Challengers: Monzo, Starling, Revolut. API platforms: Plaid, TrueLayer, Yapily.

This is the kind of cross-camp coalition that historically takes years to assemble. The framework targets subscriptions, utility bills and other repeat payments, categories where card rails still dominate but A2A economics are increasingly attractive. By making recurring payments programmable through open banking APIs, the scheme effectively gives Britain's merchants a card-network alternative that doesn't require building new consumer behaviour from scratch.

It also lands at the perfect moment for the UK's Financial Conduct Authority and the Joint Regulatory Oversight Committee, both of which have repeatedly flagged variable recurring payments as a strategic priority.

Money20/20 Europe: The Stack Comes Into Focus

The UKPI scheme wasn't the only headline out of Amsterdam this month. Fintechly and FinTech Futures chronicled a packed announcement schedule across four themes set by Money20/20: AI and the Agentic Age, The Great Rebundling, Money Stack Rewired, and Regulation in the Fast Lane.

Checkout.com Plugs Stablecoins Into the Stack

Checkout.com unveiled a new stablecoin acceptance capability powered by Coinbase Payments, bringing programmable settlement options to merchants without forcing them to manage the underlying crypto plumbing. It's a strategically loud move for an open-banking-adjacent player that just months ago framed stablecoins as a wholesale settlement story.

IFX Payments Ships ibanq 2.0

IFX Payments used the conference to roll out ibanq 2.0, a rebuilt platform with faster onboarding, broader currency coverage and a single connection to multiple payment rails. The launch reflects a broader 2026 reality: payment-orchestration providers are now expected to function as universal API adapters, not single-rail processors.

BaaS, Reorganized: Raisin, Mambu and the New Sponsor Bank Playbook

If PSD3 sets the rules and UKPI sets the schemes, Banking-as-a-Service sets the distribution. And here, this month's most telling story comes from Germany: Raisin Bank has launched its BaaS offering on top of Mambu's cloud-native core banking platform, FinTech Futures reported.

That partnership matters for two reasons. First, Raisin Bank is one of the EU's most experienced sponsor banks, its move tells the market that licensed institutions, not pure-play tech vendors, will lead the next BaaS wave. Second, Mambu (alongside Thought Machine, Temenos, Finxact, Tuum and Pismo) is increasingly the substrate of choice for those institutions.

Sumsub's recent BaaS market analysis estimates the global BaaS market at USD 35-45 billion in 2026, with projections of USD 75–90 billion by 2030–31. The structural story underneath those numbers: regulators across Europe, the UK and the US have tightened oversight, and only sponsor banks with strong audit trails are picking up new partner volume.

Eiendomskreditt Picks a Path

In a separate but symptomatic move, Norway's Eiendomskreditt selected Knowit and Mambu to modernise its core banking platform. Niche institutions choosing composable cores over monoliths is now table stakes, not a press release.

Temenos, Bain and the "Megatrends" Lens

Last week, Temenos and Bain & Company published a joint Technology Megatrends report on the future of banking, summarised by FF News. The headlines were unsurprising, AI, composability, cloud, open ecosystems, but the framing was useful: incumbents now have to budget for API-monetisation revenue lines, not just API-compliance cost lines.

That shift is showing up in the numbers. According to American Banker's 2026 State of Open Finance Adoption survey, 69% of banking professionals now say their institutions are forming fintech partnerships as a deliberate growth strategy, up sharply year-on-year.

Reading the Tea Leaves

Three things to track in the next 90 days. First, the Official Journal date for PSD3/PSR. Once published, the 18-month transitional clock starts and the compliance budget reshuffle begins in earnest. Second, the UKPI's first wave of pilot merchants, the credibility of recurring A2A hinges on consumer acceptance, not just bank alignment. Third, the sponsor-bank league table in BaaS. With Raisin shipping and Cross River freshly capitalised, expect new entrants, and new exits, by Q4.

Open banking's last decade was about possibility. Its next is about distribution. As of this week, the distribution layer has a name, a regulator, and a roadmap.