Open Banking Guide 2025

Open banking is transforming the relationship between consumers and their financial data. By enabling secure, consented data sharing via standardised APIs, it is unlocking a new generation of personalised financial products — from instant loan approvals to real-time cash flow intelligence. Here is everything you need to know.

Last updated: | Reviewed by the FintechWizard Digital Payments Team📋 Table of Contents

1. What Is Open Banking?
2. How Open Banking Works: APIs Explained
3. Benefits for Consumers, Businesses & Banks
4. PSD2 and the Regulatory Framework
5. Open Banking Around the World in 2025
6. 10 Real-World Open Banking Use Cases
7. Is Open Banking Secure?
8. The Future: Open Finance and Beyond

What Is Open Banking?

Open banking is a financial services model that allows consumers and businesses to securely share their bank account data — transaction history, balances, payment initiation — with licensed third-party providers (TPPs) via regulated application programming interfaces (APIs).

Crucially, data sharing only occurs with the explicit, informed consent of the account holder. Open banking turns financial data — historically locked within individual banks — into a portable asset that the consumer controls.

The implications are profound: a consumer can grant a personal finance app access to all their accounts across multiple banks, enabling truly holistic money management. A small business can allow an accountancy platform to access real-time transaction data. A lender can verify income in seconds rather than days.

How Open Banking Works: APIs Explained

The technical backbone of open banking is the API (Application Programming Interface) — a standardised set of rules that allows different software systems to communicate securely.

The Three-Party Architecture

1. Account Servicing Payment Service Provider (ASPSP) — This is the bank or financial institution that holds the account data and exposes it via an API (e.g., Barclays, HSBC, Chase)
2. Third-Party Provider (TPP) — A regulated company that accesses the data with customer consent (e.g., Plaid, TrueLayer, Yapily, Tink)
3. End User — The account holder who grants explicit, revocable consent to the data access

Two Types of Open Banking Service

• Account Information Services (AIS) — Read-only access to account data (balances, transactions, identity). Used by budgeting apps, credit scorers, and lending platforms for income verification.
• Payment Initiation Services (PIS) — The ability to initiate payments directly from a bank account, bypassing card networks. Used for pay-by-bank checkouts, instant money transfers, and payroll disbursement.

Benefits of Open Banking

For Consumers

• Better financial products — Lenders using real transaction data approve more customers at fairer rates than credit-score-only models
• Holistic money management — See all accounts, cards, and investments in one place
• Faster loan approvals — Income and affordability verified in seconds, not days
• Lower payment costs — Pay-by-bank eliminates card fees (saving 1–3% per transaction)
• Financial data portability — Switch banks without losing your financial history

For Businesses

• Instant payment confirmation — No chargebacks, reduced fraud vs card payments
• Automated reconciliation — Real-time bank feeds eliminate manual bookkeeping
• Embedded finance — Launch financial products without building banking infrastructure
• Credit underwriting at scale — Alternative data models assess thin-file customers accurately

For Banks

• New API monetisation revenue streams
• Reduced cost-to-serve through digital self-service
• Access to third-party innovation without building in-house
• Data-driven cross-sell opportunities

PSD2 and the Regulatory Framework

The Revised Payment Services Directive (PSD2), implemented across the EU/EEA from September 2019, was the first major legislative catalyst for open banking. PSD2 requires all banks to provide licensed TPPs with standardised API access to customer account data and payment initiation — provided the customer consents.

Key PSD2 security requirements include:

• Strong Customer Authentication (SCA) — Multi-factor authentication (MFA) using two of: something you know (PIN), something you have (device), something you are (biometric)
• 90-day re-authentication — Users must re-consent every 90 days for ongoing AIS access
• GDPR alignment — Data access is governed by explicit, granular consent under GDPR

In the UK, Open Banking was mandated by the Competition and Markets Authority (CMA) for the nine largest banks (CMA9) from 2018. The Financial Data Access (FIDA) Regulation, proposed in the EU in 2023, will extend open banking to investment accounts, insurance, and pensions — creating Open Finance.

Open Banking Around the World in 2025

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Region	Status	Key Framework	Adoption
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10 Real-World Open Banking Use Cases

1. Account aggregation — Apps like Emma, Copilot, or Mint showing all your accounts in one dashboard
2. Instant income verification — Mortgage lenders like Nationwide UK using open banking to verify affordability in seconds instead of requesting 3 months of bank statements
3. Variable recurring payments (VRP) — Subscription payments that can flex based on usage, replacing direct debits with consent-driven, controllable alternatives
4. Pay-by-bank at checkout — Shoppers paying directly from their bank account without entering card details (used by Klarna, GoCardless, Stripe Financial Connections)
5. Alternative credit scoring — Fintech lenders using 12 months of transaction history to lend to applicants with thin credit files
6. Automated tax filing — Accounting platforms like Xero and QuickBooks pulling real-time transaction feeds for automated bookkeeping
7. Smart saving — Apps like Moneybox or Plum using spending pattern analysis to automatically move surplus cash into savings
8. Benefits eligibility checking — Government services verifying financial eligibility for benefits without paper statements
9. SME cash flow forecasting — Platforms using open banking feeds to predict 90-day cash flow and proactively alert businesses to potential shortfalls
10. Anti-money laundering (AML) — Compliance teams using transaction data to detect suspicious patterns with greater accuracy and lower false positive rates

Is Open Banking Secure?

Open banking is more secure than screen scraping — the previous method where fintech apps asked users for their bank login credentials to access data on their behalf.

Key security protections include:

• OAuth 2.0 authentication — Industry-standard, token-based authentication that never shares your actual bank password with third parties
• Regulated access only — Only FCA (UK), EBA (EU), or equivalent-regulated TPPs can access your data
• Granular, revocable consent — You can revoke access at any time, directly from your bank’s app
• Read-only by default — AIS access cannot initiate payments; PIS requires a separate consent event with SCA
• API encryption — All data transmitted via TLS 1.2+ encryption

Your bank remains liable for any fraud that occurs through its API if proper security protocols were followed. Always use regulated apps and verify TPP registration with your country’s financial regulator before consenting.

The Future: Open Finance, Open Data, and Embedded Finance

Open banking is the first phase of a much larger transformation. Open Finance extends the model to mortgages, pensions, investments, and insurance. Smart Data schemes (pioneered in the UK’s National Smart Data Strategy) will extend portable, consented data sharing to energy, telecoms, and healthcare.

The endpoint — Embedded Finance — sees financial services disappearing into non-financial platforms entirely. Your car will arrange its own insurance. Your ERP will offer working capital loans based on its data. Your payroll platform will offer earned wage access. Open banking infrastructure, built today, is the foundation layer making this possible.

For deeper coverage of digital payments innovation, explore our full category, or read about how neobanks are leveraging open banking to compete with incumbents and AI is transforming financial data analysis.

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