What Is Open Banking and How Does It Work? A Plain-English Guide
Your bank holds a lot of information about you — your balance, your spending habits, your regular bills. For decades, that data sat locked inside the bank's own systems. Open banking changes that equation by letting you decide who else gets to see it.
The Simple Definition of Open Banking
Open banking is a system that allows banks to share your financial data with other authorised apps and services — but only when you explicitly give permission. The bank doesn't hand over your login credentials; instead, it sends specific data through a secure, standardised connection called an API (Application Programming Interface).
Think of it like a controlled window into your account. You choose what the app can see, and you can close that window at any time. The bank remains your bank — open banking simply lets trusted third parties read (or in some cases, act on) the information you already own.
This shift puts consumers in control of their own financial data rather than leaving it permanently siloed inside one institution.
How Open Banking Actually Works — Step by Step
The process follows a clear sequence, even if it happens invisibly in the background when you tap a button on your phone.
- You choose a service. You decide to use a budgeting app, a payment tool, or another financial service that runs on open banking.
- You give consent. The app asks for your permission to access specific data from your bank — for example, your transaction history for the last 90 days. You read what's being requested and agree.
- The app contacts your bank's API. The app sends a request through a secure API — essentially a standardised digital doorway your bank has opened for authorised third parties.
- Your bank authenticates you. You're redirected to your bank's own login screen (not the app's) to confirm your identity. This keeps your credentials with your bank, not the third party.
- Data is shared securely. Once authenticated, the bank passes the requested data — and only that data — back to the app via the API. Everything is encrypted in transit.
- The app delivers its service. The budgeting app now shows your spending categories, or the payment service initiates a transfer directly from your account.
No screen-scraping, no stored passwords. The entire flow is governed by your consent and secured by encryption at every step.
The Two Main Services Open Banking Enables
Open banking powers two distinct categories of service, and understanding the difference helps you recognise them in everyday tools.
Account Information Services (AIS)
Account Information Services are read-only. An AIS provider connects to one or more of your bank accounts and pulls data — balances, transaction history, income patterns — to give you a clearer picture of your finances. Budgeting apps that aggregate accounts from multiple banks are the classic example. The app can see your data, but it cannot move money.
Payment Initiation Services (PIS)
Payment Initiation Services go one step further. A PIS provider can trigger a payment directly from your bank account on your behalf, without you needing to enter card details. When you check out on a retail site and see an option to "Pay by bank," that's PIS in action. The payment goes straight from your account to the merchant — no card network in the middle, which typically means lower fees and faster settlement.
Both service types require your explicit consent before anything happens, and both are regulated categories under open banking frameworks.
The Role of Regulation — Why Open Banking Exists
Open banking exists because regulators mandated it, not because banks volunteered. The primary framework in Europe and the UK is PSD2 (the Payment Services Directive 2), which came into force in 2018 and required banks to open their APIs to authorised third-party providers (TPPs).
The logic behind PSD2 was straightforward: banks had a monopoly on customer data, which stifled competition and innovation. By requiring data portability — on the customer's terms — regulators created space for a new generation of fintech services to emerge.
Other regions have developed parallel frameworks. The UK built on PSD2 with its own Open Banking Standard overseen by the Open Banking Implementation Entity. Australia launched the Consumer Data Right (CDR). The US is moving toward similar rules under the Consumer Financial Protection Bureau's Section 1033 rulemaking.
The regulatory angle matters for consumers: any third-party provider operating under these frameworks must be registered, audited, and held to strict security standards. This isn't a grey market.
Open Banking in Everyday Life — Real Use Cases
Open banking already powers tools millions of people use without realising it.
- Budgeting and money management apps — Services that pull transactions from all your accounts into one dashboard rely on AIS connections. You see one complete picture instead of logging into three separate banking apps.
- Instant bank transfers at checkout — "Pay by bank" options at e-commerce checkouts use PIS to move money directly, often settling faster than a card payment and without exposing your card number.
- E-wallet top-ups — Many digital wallets now let you fund your balance directly from a bank account via open banking rather than requiring a debit card. This is faster and sometimes cheaper for the wallet provider, savings that can be passed on to users.
- Credit and affordability checks — Lenders can use AIS connections to verify income and spending patterns in real time, often replacing the need to upload bank statements manually.
- Mortgage and rental applications — Some platforms use open banking to verify income instantly, cutting days off the application process.
For anyone who regularly uses payment apps or e-wallets, there's a good chance open banking is already working in the background.
Is Open Banking Safe? Understanding Consent and Data Protection
Open banking is designed with safety as a structural requirement, not an afterthought — though no system is entirely without risk.
The consent model is the first layer of protection. You must actively authorise each connection, you can see which apps have access to your data, and you can revoke that access at any time through your bank's app or online portal. Consent is granular: an app can only access what you approved, not your entire financial history by default.
On the technical side, data travels through encrypted APIs using industry-standard protocols. Your bank credentials are never shared with third-party apps — authentication always happens on the bank's own platform. This eliminates the credential-theft risk that existed with older screen-scraping methods.
Regulatory oversight adds another layer. TPPs must be registered with a financial regulator (such as the FCA in the UK) to operate legally. If a provider misuses data, they face significant legal and financial consequences.
That said, it's reasonable to be selective. Before connecting any app to your bank account, check that the provider is on your regulator's official register. Legitimate open banking apps will always redirect you to your bank's own login page — if an app asks for your banking username and password directly, that's a red flag.
Open Banking vs. Traditional Banking — Key Differences
The core difference is data portability. In traditional banking, your financial data belongs to the bank in practice — you can see it, but you can't easily share it with other services. Open banking establishes that the data belongs to you, and you can direct where it goes.
| Traditional Banking | Open Banking |
|---|---|
| Data stays within the bank's ecosystem | Data can be shared with authorised third parties |
| Payments route through card networks | Payments can go directly bank-to-bank via PIS |
| New services require manual data entry | Services can access verified data instantly with consent |
| Limited competition between providers | Fintech innovation built on shared infrastructure |
This shift doesn't replace your bank — it extends what's possible around it. Your current account, savings, and banking relationship stay exactly where they are. Open banking just removes the walls that previously kept your financial data trapped in one place.
Frequently Asked Questions
Do I have to opt in to open banking, or is it automatic?
Open banking is always opt-in. Your bank is required to have the infrastructure in place, but no data is shared unless you actively choose to connect a third-party app and grant permission. You will never be enrolled without taking a deliberate action.
Can open banking apps see my full bank account details?
Only what you authorise. When you connect an app, it specifies exactly what data it needs — for example, transaction history but not your full account number. You approve or decline that specific request. The app cannot access anything beyond the scope you agreed to.
What happens if I revoke consent from a third-party app?
The app immediately loses access to your account data. Most banks let you manage and revoke connections directly in their mobile app or online banking portal. The third party is required to stop using your data once consent is withdrawn, though you should check the app's own privacy policy for details on data deletion.
Is open banking available worldwide or only in certain countries?
It's most mature in the UK and EU (under PSD2), but the model is spreading. Australia, Brazil, Canada, Singapore, and several other countries have active open banking or consumer data right frameworks at various stages. The US is in the process of formalising rules. Coverage and capabilities vary significantly by country.
How is open banking different from simply linking my bank card to an app?
Linking a card stores your card number with the app and routes payments through a card network. Open banking connects directly to your bank account via an API — no card number is stored, and payments (via PIS) bypass the card network entirely. This is generally more secure and can be faster, though it depends on the specific implementation.