Account-to-account (A2A) payments are electronic transfers of funds directly from one bank account to another, bypassing card networks and third-party processors. The category encompasses both traditional batch rails such as ACH and SEPA Credit Transfer, and newer real-time systems such as Faster Payments, PIX, and UPI, as well as open-banking-powered payment initiation.

ACH (Automated Clearing House) is a US electronic payment network that processes bank-to-bank transfers in batches, including direct deposits, bill payments, and business transactions.

ACH return codes are standardized two-character codes, each beginning with "R," that identify why an ACH payment could not be completed. Maintained by NACHA, they carry prescribed return timeframes and handling rules that govern how originating and receiving financial institutions respond to failed transactions.

Atomic settlement is a mechanism that enables the simultaneous exchange of assets and payments in a single, indivisible transaction. By using blockchain technology and smart contracts, it reduces or eliminates counterparty and settlement risk in cross-border and multi-asset transfers.

Bank reconciliation is the process of comparing a company's internal cash records with its bank statement to confirm they agree. Any differences are identified, explained, and corrected before financial reports are finalized.

Blockchain is a distributed ledger technology that records transactions across multiple computers in a way that makes the record immutable and transparent, enabling faster and cheaper cross-border payments without traditional intermediaries.

The Bulk Electronic Clearing System (BECS) is Australia's primary account-to-account payment system for processing direct debits and direct credits in bulk batches. Administered by the Australian Payments Network (AusPayNet), it settles obligations through the Reserve Bank of Australia on business days and underpins payroll, welfare, utility billing, and supplier payments across the country.

A centralized exchange (CEX) is a cryptocurrency trading platform operated by a company that acts as an intermediary between buyers and sellers, managing user accounts, custody of assets, and order matching through centralized infrastructure.

CHAPS (Clearing House Automated Payment System) is the UK's real-time gross settlement system for high-value and time-critical GBP payments. Operated by the Bank of England, it settles payments individually and irrevocably in central bank money, making it the backbone of UK property transactions, wholesale financial flows, and large interbank transfers.

CHIPS is the largest private U.S. dollar clearing system, settling an average of $1.9 trillion in payments each day. This guide explains how CHIPS works, how its multilateral netting model reduces liquidity and settlement costs, and how it compares to Fedwire for high-value domestic and cross-border transfers.

Cash application is the accounts receivable process of matching each incoming payment to the correct customer invoice or account balance and posting it to the general ledger. Until a payment is applied, it cannot be recognized as revenue or used to assess what a customer still owes.

Cash pooling is a treasury management technique that combines cash balances from multiple bank accounts or corporate entities into a centralized structure. It allows a company to use surplus cash in one account to cover deficits in another, reducing the need for external borrowing and improving visibility across the group's overall cash position.

Cash reconciliation is the process of comparing a company's internal cash records with external financial records, such as bank statements, to make sure they match. Any differences are investigated and corrected before financial reports are finalized.

A clearing account is a temporary general ledger account that holds transactions in transit until they can be verified and moved to their correct permanent accounts. Once all matching entries are posted, the clearing account balance returns to zero.

Core banking refers to the centralized back-end systems that banks use to process transactions, manage customer accounts, and deliver services across branches and digital channels. These systems are the operational foundation of any bank or financial institution, handling everything from deposits and withdrawals to loans, payments, and general ledger records.

Custodial wallets are cryptocurrency wallets where a third party manages your private keys, while non-custodial wallets give users full control over their private keys and therefore their digital assets.

A decentralized exchange (DEX) is a cryptocurrency trading platform that enables peer-to-peer trading without requiring users to deposit funds with a centralized intermediary, using smart contracts to facilitate trades directly from user wallets.

EURC (Euro Coin) is a euro-backed stablecoin issued by Circle, designed to maintain a value of €1 through reserves of euros held in regulated European financial institutions.

Electronic Funds Transfer (EFT) is an umbrella term for any digital transfer of money between bank accounts without using cash or paper checks, including ACH transfers, wire transfers, debit card payments, and ATM transactions.

The Ethereum Virtual Machine (EVM) is a decentralized computation engine that executes smart contracts across thousands of nodes on Ethereum and EVM-compatible blockchains.

FedACH is the Federal Reserve's ACH service for batch payments. Learn how it works, processing windows, and how it compares to FedNow and Fedwire.

FedNow is an instant payment system operated by the Federal Reserve that settles transfers between US banks in seconds, operating 24/7/365 with transaction limits up to $500,000.

Fedwire is a real-time gross settlement system operated by the Federal Reserve Banks that allows financial institutions to transfer funds electronically between each other on the same business day.

Fiat money is government-issued currency that derives its value from government regulation and public trust rather than being backed by a physical commodity like gold or silver.

FinCEN is the U.S. Treasury bureau responsible for enforcing anti-money laundering (AML) and counter-terrorist financing regulations. This overview explains FinCEN’s mandate, who falls under its supervision, and what banks, fintechs, and payment companies must do to remain compliant with U.S. reporting and AML requirements.

Flow of funds describes the path money takes from its origin to its final destination, including every account, entity, and payment rail it passes through along the way. In a payments context, mapping the flow of funds reveals who holds the money at each stage, for how long, and under what regulatory and operational obligations.

Know Your Customer (KYC) is a regulatory compliance process that requires financial institutions to verify the identity of their customers before providing services, designed to prevent money laundering, fraud, and terrorist financing.

Liquidity management is the process of monitoring and controlling cash flow to ensure a business maintains sufficient liquid assets to meet its short-term financial obligations while optimizing returns on excess cash.

Money transmission is the business activity of receiving money or monetary value from one party and transferring it to another. Any business that does this, whether through bank transfers, digital wallets, or stablecoins, is typically classified as a money transmitter and subject to licensing and compliance requirements.

Nacha governs the ACH Network, setting the rules behind more than 35 billion U.S. payments each year. This guide explains Nacha’s role, how ACH rules are created and enforced, and what fintechs and payment companies need to understand to operate compliantly and scale on the network.

The Office of Foreign Assets Control (OFAC) is a US Treasury Department agency that administers and enforces economic and trade sanctions against foreign governments, entities, and individuals deemed a threat to US national security or foreign policy.

On-demand liquidity (ODL) is a payment settlement method that uses digital assets to convert between currencies instantly, removing the need for banks to maintain pre-funded accounts in multiple countries.

On-ramps and off-ramps are services that facilitate the conversion between fiat currencies (like USD or EUR) and cryptocurrencies or stablecoins, with on-ramps enabling fiat-to-crypto conversion and off-ramps enabling crypto-to-fiat conversion.

PayPal USD (PYUSD) is a fiat-backed stablecoin issued by Paxos Trust Company and distributed by PayPal, pegged 1:1 to the US dollar and backed by cash and short-term US Treasuries. It is available on Ethereum and Solana, with reserves independently attested on a monthly basis.

A payment API is a programmatic interface that enables applications to initiate, process, and manage financial transactions without building payment infrastructure from scratch, connecting to payment rails like ACH, wire transfers, or stablecoin networks.

A payment ledger is a record-keeping system that tracks all money moving between accounts. It ensures every dollar has both a source and destination, making balances accurate and auditable.

Payment orchestration is a technology layer that connects multiple payment providers through a single API, dynamically routing transactions to optimize approval rates, costs, and reliability. It enables businesses to manage gateways, acquirers, and fraud tools in one unified system.

Payment reconciliation is an accounting process that compares internal payment records with external bank statements and payment processor reports to verify that all transactions are accurate and properly recorded.

A Payment Service Provider (PSP) is a third-party company that enables businesses to accept electronic payments through multiple methods including credit cards, debit cards, digital wallets, and bank transfers.

A penny test, also called a penny drop or micro-deposit verification, is a small-value transaction sent to a bank account to confirm that the account exists, is active, and can receive funds. It is used to validate account details before initiating larger payments, payroll runs, or new banking integrations.

Pix is an instant payment platform created and operated by the Central Bank of Brazil that enables real-time transfers in Brazilian real 24/7 with no fees for individuals.

Programmable money uses smart contracts to execute payments automatically when predefined conditions are met. This overview explains how the technology works, explores real-world use cases across finance and commerce, and examines how central banks are testing programmable features within digital currency initiatives.

QR code payments allow users to complete transactions by scanning a code with their smartphone, enabling fast, contactless transfers. This guide explains how QR payments work, the difference between static and dynamic codes, and which countries and payment ecosystems have widely adopted them.

RTP (Real-Time Payments) is a US instant payment network operated by The Clearing House that settles bank-to-bank transfers in seconds, available 24/7 year-round.

Real-time gross settlement (RTGS) is a payment settlement mechanism in which transactions are processed and settled individually, on a gross basis, as they are submitted, rather than batched or netted. Settlement occurs in central bank money, making each transfer immediate and irrevocable.

SEPA (Single Euro Payments Area) is a unified payment network that standardizes euro bank transfers across 36 European countries, enabling businesses and individuals to send EUR payments as easily as domestic transactions.

SPEI is an instant payment platform created and operated by the Banco de México (Mexico's central bank) that enables real-time transfers in Mexican pesos 24/7 with minimal or no fees for most users.

SWIFT (Society for Worldwide Interbank Financial Telecommunication) is a global messaging network that banks use to send secure payment instructions for international transfers.

Same-day ACH is a faster settlement option within the US ACH network that allows credits and debits to settle on the same banking day they are submitted, across three processing windows. It is governed by NACHA and can reach every bank and credit union account in the United States.

Section 314(b) of the USA PATRIOT Act is a provision that allows financial institutions to voluntarily share information with one another for the purpose of identifying and reporting potential money laundering or terrorist financing activity.

A sort code is a 6-digit identifier used in the UK to route domestic bank transfers. Written as three hyphenated pairs (XX-XX-XX), it tells the payment network which bank and branch should send or receive funds across Faster Payments, BACS, and CHAPS rails.

Stablecoins are digital currencies designed to maintain stable value by pegging to fiat currency like the US dollar, enabling instant cross-border transactions that settle in seconds rather than days through traditional banking rails.

A sweep account is a bank account configured to automatically transfer funds above or below a set balance threshold into a linked account. The transfer, called a sweep, typically runs at the end of each business day and ensures excess cash earns a return or reduces debt rather than sitting idle.

T2 is the Eurosystem’s real-time gross settlement (RTGS) system launched in 2023, processing around €1.8 trillion in euro payments daily. It uses ISO 20022 messaging standards and supports multi-currency services within the Eurosystem’s consolidated TARGET infrastructure, forming the core settlement layer for high-value euro transactions.

Take rate is the percentage of each transaction that a marketplace, payment platform, or service provider keeps as revenue. It is the main way platforms make money and a key number for any fintech or marketplace evaluating payment costs.

The Clearing House (TCH) is the oldest banking association and payments company in the United States, founded and owned by the largest US commercial banks. It operates three core payment networks: CHIPS for large-value wire settlement, EPN for private-sector ACH, and the RTP network for real-time payments, together clearing more than $2 trillion in payments on an average business day.

Treasury management is the strategic oversight of an organization's financial resources, focusing on optimizing liquidity, managing financial risk, and ensuring the company can meet its financial obligations while maximizing working capital efficiency.

USDC (USD Coin) is a fully-backed stablecoin issued by Circle, designed to maintain a value of $1 through reserves of cash and short-term US Treasury bills held in regulated institutions.

USDT (also called Tether) is a stablecoin designed to maintain a value of $1 by being backed by reserves including cash, Treasury bills, and other assets held by Tether Limited.

UPI is India’s real-time payment system, handling more than 20 billion transactions each month. This guide explains how UPI works, the infrastructure and participants behind it, its international expansion efforts, and what its scale and model mean for fintechs building in or integrating with India’s payments ecosystem.

A virtual account is a unique account number assigned within a traditional bank account that enables businesses to track and reconcile payments automatically without opening multiple physical accounts.

VASP (Virtual Asset Service Provider) is any entity that conducts business activities involving virtual assets such as cryptocurrencies, including exchanges, wallet providers, custodians, and payment processors.

A wire transfer is a bank-to-bank payment method that moves funds electronically through networks like Fedwire (domestic US) or SWIFT (international), typically settling within hours domestically or one to five business days internationally.

XRP is a digital asset created for institutional payment settlement, operating on the XRP Ledger with 3-5 second finality and $0.0002 transaction costs.