Interchange optimization, and how to tell the real thing from the pitch.
Nobody can negotiate interchange. What can be changed is which published category a transaction lands in, and that is decided by data and timing. Everything genuine under this heading is one of about six things.
What this page settles.
Three questions, in the order most people ask them.
What cannot be optimized
The rate itself.
Interchange is published by Visa and Mastercard, and every acquirer in the country pays the same published rate for the same transaction in the same category. There is no volume tier, no negotiated rate, no relationship discount. A processor who tells you they have access to better interchange is describing something that does not exist.
That is worth holding onto, because it reduces a confusing sales conversation to one question: are you talking about the category, or about your own margin?
What genuinely can
Which category a transaction lands in.
The published tables contain many categories for what looks to you like one sale. A commercial card with full line-item data sits in a different category from the same card with none. A card-not-present transaction with a verified address sits in a different category from one without. A transaction settled within the window sits in a different category from one settled three days later.
Same card, same amount, different cost — decided by data and timing, both of which are yours.
That is the entire legitimate content of “interchange optimization”. It is real, it is sometimes worth a lot, and it is almost never a negotiation.
The six things that actually work
In rough order of what they are worth.
1. Level 2 and Level 3 data on commercial cards. By a distance the largest item for anyone selling to businesses. Purchase order numbers, tax amounts, and for Level 3 full line-item detail. The full page is here.
2. Address verification and security codes on card-not-present transactions. Cheap, immediate, and it reduces fraud at the same time.
3. Settling within the window. Batch daily, before your processor’s cut-off. Timing in detail.
4. Correct transaction types. Authorizing one amount and settling another — tips, partial shipments, adjusted orders — needs handling the way the network expects, or the transaction downgrades.
5. The right merchant category code. Your MCC was set when you were boarded and it determines which tables apply to you. If it is wrong, every transaction you take is being priced against the wrong set of categories. Worth checking once.
6. Not keying what you could dip or tap. A card read by your terminal is in a cheaper category than the same card typed in. Obvious, and still the quiet cause of a lot of avoidable cost in businesses that have drifted into keying.
All six are configuration or habit. None of them is a rate negotiation, and none of them should carry a fee.
How to tell a real offer from a pitch
Ask two questions.
“Which categories is my volume currently landing in, and which ones would it move to?” A real answer names categories. A pitch talks about savings percentages.
“What specifically changes — what data, or what setting?” A real answer is a list like the six above. A pitch says their platform is optimized, or that they have relationships.
And a third, if an explicit fee is attached: “What am I paying you for that I could not switch on myself?” For a large B2B merchant needing a Level 3 integration, there is a genuine answer. For a retail business, usually there is not.
The cleanest tell: anybody who can quote you a saving before seeing your statement is not optimizing anything, because the answer depends entirely on what your volume is currently doing.
Why the pricing model decides whether it reaches you
This is the part most worth understanding, and it is the reason optimization is not always in your provider’s interest.
Under interchange-plus, interchange passes through at cost. A transaction qualifying for a cheaper category means a smaller bill for you, visibly, on the same statement. Your processor’s margin is unchanged. They lose nothing by helping you.
Under tiered pricing, your rate is a bucket. If the underlying interchange falls and the bucket does not, the saving stays upstream. You did the work and somebody else got the benefit.
Under flat rate, the same, by design and openly — you are paying a premium for predictability and the provider absorbs the variation in both directions.
So the honest sequence for a merchant who wants to optimize is: get onto a model where improvements reach you, then do the six things. Doing them in the other order is effort donated to your processor.
What we charge
Interchange + 0.50% + 10¢ in person, interchange + 0.75% + 25¢ keyed, with interchange passed through at cost. When a transaction qualifies for a cheaper category, the saving is yours — that is not generosity, it is just what pass-through means.
We do not sell interchange optimization as a service, because for most businesses it is six settings and a habit. Send us a statement and we will tell you which of the six apply to you and roughly what they are worth.
While we are on the subject
Can a processor negotiate interchange on my behalf?
No. Interchange is set by Visa and Mastercard and every acquirer pays the published rate. What a good processor can do is help your transactions qualify for cheaper published categories.
Is interchange optimization worth paying for as a service?
Occasionally, for a large B2B merchant where Level 3 integration is a real project. For most businesses the useful parts are configuration and habit, and should not carry a separate fee.
How much can it save?
Entirely dependent on your card mix and what you are currently doing wrong. A B2B merchant sending no commercial card data has far more to gain than a coffee shop taking contactless debit.
Will it help if I am on tiered pricing?
Often not. If a transaction qualifies for a cheaper category and your rate is a fixed bucket, the saving stays with the processor rather than reaching you.