What is Open Banking?

Who are the participating banks

Chapter 3

When the regulation passed by the CMA was first launched, 9 UK based banks were ordered to create Open Banking APIs. These participating banks are referred to as the CMA9. Of these 9 banks, only 4 made the 13th of January deadline and the CMA granted the remaining 5 longer timelines to build their APIs.

But these aren’t the only banks that are producing Open Banking APIs, smaller challenger banks that are more innovative and focussed on the needs of their customers, are also releasing their APIs.

Currently, there are 8 banks that have released their Open Banking APIs, We’ve listed them below along with the sub-brands that they also operate:


Royal Bank of Scotland (RBS) – Retail and Business accounts

  • NatWest – Retail and Business accounts
  • Ulster Bank – Retail and Business accounts

Lloyds – Retail and Business accounts

  • Bank of Scotland – Retail and Business accounts
  • Halifax – Retail accounts

Barclays – Retail and Business accounts


 Santander – Retail and Business accounts



HSBC – Retail and Business accounts

  • M & S – Retail accounts
  • First Direct – Retail accounts

Nationwide – Retail accounts


Allied Irish Bank – Retail and Business accounts


Danske Bank – Retail and Business accounts


Note: The list of participating banks will be updated as and when each bank release their Open Banking API.

Why were the CMA9 chosen?

The initial 9 UK banks and the brands they operate, were ordered to create Open Banking APIs by the CMA because their combined customer bases cover 90% of UK consumers and small business accounts. Giving 90% of UK consumers and SMEs the ability to use Open Banking if they wish.

Chapter 1

What is Open Banking?

Everything you need to know about Open Banking.

Chapter 2

How we got here

Way back in 2013 The Competition and Markets Authority (CMA) started a review of the UK retail banking industry and financial...

Chapter 3

Who are the participating banks

9 UK based banks were ordered to create Open Banking APIs. These participating banks are referred to as the CMA9.

Chapter 4

How secure is Open Banking?

Open Banking is very secure - as secure as your online banking. The Open Banking API endpoints have been built by the banks...

Chapter 5

What data will be shared?

The information that you choose to share through Open Banking will vary depending on the service that you want to receive.

Chapter 6

How do I provide or remove permission?

Your online banking is the only place where you can control who has permission to see your bank account and for what purpose.

Chapter 7

What does AISP & PISP mean?

To be fully authorised through PSD2 to use the Open Banking APIs businesses have to be registered as either an AISP or PISP.

Chapter 8

Quickfire Open Banking FAQs

All your questions answered in our quick fire Open Banking FAQs.

Chapter 9

Open Banking jargon dictionary

Our Open Banking jargon dictionary has been put together to translate acronyms and keywords into simple terms.