How ATM Processing Works
A plain-English walkthrough of what happens in the seconds after a card goes in — authorization, surcharge, interchange, and settlement — and who gets paid at each step.
ATM processing is the service that connects your machine to the card networks so it can verify a cardholder, authorize a withdrawal against their bank account, apply your surcharge, and move money back into your bank account. Every ATM needs a processing relationship to function. The only real questions are who provides it and on what terms.
Understanding the flow matters commercially, not just technically: it is what lets you read a processing agreement and tell the difference between a rate and a revenue split.
What happens when someone uses your ATM?
A withdrawal takes a few seconds and touches at least five parties. The sequence is always the same, whether the machine is in a bar or a bank lobby.
- Card and PIN are captured. The card is read — by chip, in practice, since the EMV liability shifts — and the PIN is encrypted inside the machine’s encrypting PIN pad. The PIN is never available in the clear to you, the machine, or the processor.
- The request goes to your processor. Your machine sends an authorization request over its internet or cellular connection to the processor you are set up with.
- The processor routes it to a network. The processor passes the request to a shared ATM network — PULSE, STAR, NYCE, Cirrus, or Plus among others — which knows how to reach the cardholder’s bank.
- The cardholder’s bank approves or declines. The issuing bank checks the balance, daily limits, and fraud rules, then answers. This is the step that actually decides whether cash comes out.
- The machine dispenses and discloses. On approval the machine presents the surcharge notice, the cardholder accepts, and the cassette dispenses.
- Settlement follows. The funds you dispensed are reimbursed to your account, typically on the next business day, along with the surcharge revenue owed to you.
The important thing to internalize: your machine dispenses your cash first and gets reimbursed afterward. That is why vault cash is working capital, and why settlement timing — not just the rate — belongs on your list of questions for any processor.
What is the difference between surcharge and interchange?
These are two different fees, paid by two different parties, and confusing them is the single most common mistake in ATM revenue math.
The surcharge is the fee the cardholder pays for using your machine. It is the number displayed on screen before they commit, and it is the primary revenue in a retail ATM program. Bankrate’s 2025 study put the average operator surcharge at $3.22. What Is an ATM Surcharge? separates it from the out-of-network fee the cardholder’s own bank adds.
The interchange is a fee paid within the payments system, tied to the transaction being routed across a network. It is not charged to the cardholder on top of the surcharge, and it is not automatically yours.
Whether any interchange reaches the ATM owner depends entirely on the program. Some arrangements pass a share of it through; many retail programs do not, and quote their economics on surcharge alone. Neither is dishonest — but a revenue projection that silently assumes interchange income you are not actually receiving will overstate what a machine earns.
Blueprint’s published processing rates and revenue examples are surcharge-based, and interchange is not included in them. If a competing proposal shows higher per-transaction income, ask specifically which portion is surcharge and which is interchange, and whether the interchange portion is contractually guaranteed or subject to change by the network.
Who gets paid on a typical retail ATM withdrawal
| Party | Role | How they are compensated | |
|---|---|---|---|
| ATM owner (you) | Owns the machine, supplies the cash, sets the surcharge | The surcharge, less the location’s share and processing costs | |
| Location / venue | Provides the floor space, power, and often the network drop | Usually a flat amount per transaction, commonly $0.25–$0.75 | |
| Processor | Connects the machine to the networks, settles funds, provides reporting | A per-transaction processing fee | |
| Card network | Routes the request to the correct issuing bank | Network fees, generally passed through in the economics | |
| Cardholder’s bank | Approves or declines against the customer’s account | Often its own out-of-network fee, charged to its own customer |
The cardholder’s bank fee is worth knowing about because it is a frequent source of complaints aimed at the wrong party. When a customer says the ATM charged them $6, they are usually adding your $3 surcharge to their own bank’s $3 out-of-network fee — a charge you neither set nor receive.
What are you actually paying a processor for?
Processing is billed per transaction rather than as a flat monthly fee, because traffic varies enormously between a quiet salon and a nightclub. What that fee buys is more than connectivity:
- Network access and routing to the shared ATM networks.
- Settlement — reimbursing your dispensed cash and paying your surcharge revenue on a predictable schedule.
- Encryption key management — the keys that protect PIN data, including the TR-31 key blocks required since January 1, 2025.
- Terminal management — the ability to reprogram, monitor, and update your machine remotely.
- Reporting — per-terminal transaction and revenue detail you can reconcile against your bank deposits.
- Support when a machine stops taking transactions and you need to know whether the problem is the machine, the connection, or the host.
Blueprint bills a flat rate per billable transaction — $0.25 on the Flex plan down to $0.15 on a three-year term — with no ordinary monthly, statement, annual, minimum, or setup fees. The $500 onboarding fee is waived. Actual third-party pass-through charges may apply. Full plan terms are on the pricing page.
How do you compare two processing offers fairly?
Rate alone is not a comparison. Two agreements with the same headline per-transaction rate can differ by hundreds of dollars a year once the rest of the terms are counted.
- What is billable? Confirm whether declines and balance inquiries are billed as transactions, not just completed withdrawals.
- What recurring fees exist? Monthly, statement, portal, annual, and minimum-volume fees are where a low headline rate is usually recovered.
- How is settlement timed? Next business day is common; slower settlement means more of your own cash tied up in the machine.
- What is the term and the exit? Length, auto-renewal, and notice period decide whether a rate is a deal or a trap.
- Who owns the terminal ID? It determines how painful it is to leave.
That last point is the one people miss until they want out. What to Read Before You Sign covers the contract clauses in detail, and How to Read Your ATM Processing Statement shows how to verify what a program is actually costing you once it is running.
Do you need a new machine to change processors?
Usually not. An ATM is not permanently bound to a processor — it is programmed to point at one. Switching generally means reprogramming the terminal and re-keying it, not replacing hardware, provided your machine is compatible with the new processor’s host and meets current EMV and key-block requirements. See Bring Your Own ATM for what that process involves and what information to have ready.
Frequently asked questions
Do I need a processor if I own my ATM outright?
Yes. Owning the machine and processing its transactions are separate things. Without a processing relationship, the ATM has no route to the card networks and cannot authorize or dispense. Ownership determines who keeps the surcharge; processing determines whether the machine works at all.
When do I get paid for the cash my ATM dispenses?
Typically the next business day, though the exact schedule is set by your processing agreement. Your machine dispenses your own cash at the moment of the transaction and is reimbursed at settlement, which is why settlement timing directly affects how much working capital you need.
Does the ATM owner keep the whole surcharge?
The surcharge goes to the ATM operator, but on most placements part of it is shared with the location. In retail ATM programs that share is almost always a flat amount per transaction rather than a percentage — commonly $0.25 to $0.75, with about $1.00 appearing mainly at dispensaries and casino-type venues.
What is interchange, and do I receive it?
Interchange is a fee that moves within the payments system when a transaction is routed across a network. It is separate from the surcharge the cardholder pays. Whether any of it reaches the ATM owner depends on the specific program — some pass a share through and many do not. Blueprint’s published rates and revenue examples are surcharge-based and do not include interchange.
Why do customers say they were charged twice?
Because they usually were, by two different parties. Your surcharge is disclosed on screen and paid to you. Their own bank may separately charge an out-of-network fee on the same withdrawal. You do not set or receive that second fee, and it will not appear on your processing statement.