Account-to-account (A2A) payments
Account-to-account (A2A) payments are fund transfers executed directly between two bank accounts without passing through card network infrastructure. They use bank-to-bank rails such as ACH, SEPA, Faster Payments, or domestic clearing systems to move funds with lower cost and greater transparency than card-based alternatives.
A2A payments have existed as long as banking itself, but the term has gained prominence as open banking and real-time payment rails have made them faster, cheaper, and more user-friendly. Open banking-enabled A2A allows payment initiation through a bank's API after the payer authenticates directly with their bank.
The cost advantage over card payments is significant. Card transactions carry interchange fees (typically 0.2–2% of transaction value), scheme fees, and acquiring fees. A2A payment costs are typically fixed per transaction or a low percentage, making them substantially cheaper for high-value transactions.
For B2B use cases, A2A is the dominant payment method. Supplier invoice payments, payroll, intercompany transfers, and marketplace disbursements all operate as account-to-account transfers. The push toward real-time A2A infrastructure is the central development in global B2B payments.
A2A payments offer lower transaction costs than card payments, direct bank account credit visibility, and, on real-time rails, instant settlement. For B2B use cases where transaction values are high, the cost advantage over card rails is material. For consumers, open banking-enabled A2A removes the need for card credentials, reducing fraud and improving checkout conversion.
- A2A payment initiation requires account details which creates friction versus card tokenization
- Real-time A2A is not universally available, since coverage depends on bank participation
- Irrevocability of bank transfers creates challenges for dispute resolution compared to card chargebacks
- Cross-border A2A requires navigating different domestic rail formats and settlement windows
- Open banking APIs vary in quality and reliability across markets
A B2B procurement platform replaces credit card payment for high-value supplier invoices with A2A payment via open banking. For invoices over £5,000, the platform offers bank transfer initiation directly through the payment flow. Card fees drop from 1.4% to a fixed £0.30 per transfer, saving £380,000 annually.
Related Concepts
Nium's payout infrastructure leverages A2A payment rails across 190+ countries, routing disbursements through domestic bank-to-bank systems including real-time networks, ACH equivalents, and SEPA rails.
Answers you didn't know you needed.
What is the difference between A2A and open banking payments?
A2A describes the payment mechanism (bank account to bank account). Open banking is the technology standard that enables third parties to initiate A2A payments via bank APIs after user authentication.
Are A2A payments cheaper than card payments?
For most use cases, yes. A2A payments avoid interchange fees (0.2–2% for cards) and carry lower per-transaction fees. The saving is most significant for high-value B2B transactions.
Can A2A payments be reversed?
A2A push payments are generally irrevocable. Recovery requires requesting a return from the recipient, unlike card chargebacks, which allow buyers to initiate disputes.
What is A2A in cross-border payments?
For cross-border A2A, funds move between bank accounts in different countries, via SWIFT for larger amounts or direct clearing connections for supported corridors.
How does Nium support A2A payments?
Nium's payout infrastructure routes to domestic A2A rails in each destination market, including real-time networks, ACH equivalents, and SEPA, providing bank account settlement across 190+ countries.