For fintechs, real-time transaction data via API determines how quickly you can respond when money moves.  

If a customer tops up a wallet, an employer funds payroll, a borrower makes a repayment, or a payment fails, your platform needs to know quickly enough to update balances, reconcile funds, and support customers.  

Banking providers in Europe that offer real-time transaction data via API include API-first banks such as ClearBank, LHV, and Banking Circle.

Accessing transaction data as it happens is often an operational necessity. This is true for several reasons, including:

Real-time access enables your internal infrastructure to move at the same speed as modern payment rails like SEPA Instant, which requires 24/7 availability and payments to be completed in under 10 seconds end-to-end.  

This removes traditional cut-off times, but it also raises expectations for the systems around the payment. If your account data, ledger updates, or reconciliation processes lag behind, your customer experience may still feel delayed even when the payment itself has moved in seconds.  

And SEPA Instant’s importance is increasing. ClearBank’s SEPA Instant adoption report, produced with Celent, found that banks expect SCT Inst to reach a tipping point around 2030. By then, banks surveyed expect SCT Inst to make up 53.8% of SEPA credit transfers across the eurozone on average. 

Read more about SEPA Instant’s increasing popularity in the report: SEPA Instant adoption in Europe.

Here are other instances where real-time transaction data is important: 

• Automated reconciliation. Incoming payments can be matched significantly faster when transaction data arrives through an API or webhook. This eliminates the need to wait for end-of-day files or to manually match spreadsheets. 
   
• Customer wallets and ledgers. If you are running a platform that processes payments, you need to update customer records when funds land. Real-time data ensures the balance your user sees in their app matches the reality at the bank. Without this data, you could also risk accidentally letting a customer spend the same funds twice because your system hasn’t yet processed a prior debit. 
   
• Treasury and liquidity management. Finance teams can make funding and cash-positioning decisions using current balances. This is far more effective than relying on stale reports that may not reflect the latest payouts or incoming transfers. 
   
• Payment operations and customer support. When a user calls in to ask about a missing transfer, support teams can see the payment status immediately. This reduces investigation time and helps support teams resolve failed, delayed, or misdirected payments sooner.

The main distinction you need to make is whether you require data from your own core account infrastructure or from a broad network of external accounts.

These are banks that hold or provide the account infrastructure. The API gives you transaction, payment status, and balance data from accounts actually held with that provider.  

This is the foundation for fintechs that need to manage account infrastructure, payment flows, customer ledgers, reconciliation, and treasury through one banking provider.

These providers aggregate account data from many third-party banks. This is useful for accounting, personal finance management, affordability checks, and multi-bank dashboards.  

However, it is not the same as having operating account infrastructure through a single bank where you control the funds.

Major European banks may offer corporate APIs for treasury, liquidity management, and balance reporting. While useful for large enterprises that already bank with these institutions, they are not always designed for fintech platform workflows such as virtual account-led reconciliation or API-first account infrastructure.

ClearBank is a UK-based clearing bank, authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority. Our European entity is authorised by the European Central Bank and regulated by De Nederlandsche Bank. 

We've built our own infrastructure to solve modern fintechs’ challenges:

Through our agency banking and transaction banking propositions, we provide a direct window into your account activity. As Chris Newman, Head of Corporates at ClearBank, explains: 
"Whenever there is a movement across one of your accounts, we tell you about it. Whenever you want to know what your up-to-date balance is, you can call the API, and we will provide you with the relevant information. Without this real-time system in place, you can't make real-time decisions."

Our platform uses webhooks to push payment event data directly to your systems. This information can trigger automated reconciliation workflows, update customer wallets immediately, or send instant notifications to your users that their funds have arrived.

ClearBank supports virtual accounts that sit underneath real accounts, including virtual accounts with vIBANs. This is especially useful when you need to identify different customers, wallets, invoices or use cases within a wider account structure. 

Read more about ClearBank's virtual account API. 

Our infrastructure connects directly to European payment rails. This includes support for SEPA Credit Transfer, SEPA Instant Credit Transfer, and T2. This lets you scale across the continent while maintaining a single, real-time view of all transactions. We also support major UK payment rails including Faster Payments and CHAPS. 

Before deciding on a banking partner, use this checklist to ensure their API meets your operational requirements. 

1. Is the data from accounts held with the provider or external accounts? This determines whether you are looking for a core banking partner or an aggregator. 
    
2. Does the provider offer webhooks or only polling? Event-based updates via webhooks are much more efficient for real-time workflows than constant polling. 
    
3. What transaction detail is included? Look for APIs that provide full payer/payee details, references, timestamps, and account identifiers. 
    
4. Which payment rails are supported? Ensure the provider covers the schemes you need, such as SEPA Credit Transfer and SEPA Instant. 
    
5. Can the API support scale and resilience? Check for high availability, uptime statistics, and clear rate limits.

ClearBank provides the API-first banking infrastructure required by fintechs that need real-time data from their own accounts.  

By supporting both real and virtual account structures alongside European payment rails, we help platforms automate reconciliation and manage liquidity. 

Get in touch.

Sources 

• https://www.lhv.com/financialinstitutions/api 
• https://docs.bankingcircleconnect.com/docs/discover-our-api-offering 
• https://docs.truelayer.com/docs/asynchronous-calls-and-webhooks 
• https://docs.yapily.com/api-reference/financial-data/get-real-time-account-transactions 
• https://developer.db.com/ 
• https://tink.com/  

*Disclaimer: All information relating to third-party products and companies featured in this article has been sourced solely from their respective public websites and official publications at the time of writing. ClearBank makes no representations as to the accuracy, completeness, or currency of this information. Product features, positioning, and company details may have changed since publication. Readers should refer to each provider's official website for the most up-to-date information before making any purchasing decisions.