Merchant One Review

A Miami Beach independent sales organization, incorporated in 2002 and bought by Fiserv in December 2022 for about $300 million — a fact almost no review of it mentions, and one that undercuts its own "we're not a broker or middleman" claim. It publishes headline rates, which is rare for an ISO, but they are qualified-tier rates on a tiered plan, and its Trustpilot score of 4.9 and its BBB customer-review average of 1.02 across 56 reviews describe two different companies.

Estimated annual cost at three realistic processing volumes, using Merchant One’s published online rate plus monthly fees. Real costs vary with average transaction size, chargeback rate, and any negotiated terms.

The thing nobody mentions: Fiserv owns it

Merchant One presents itself as an independent Miami Beach processor, and its home page says so in as many words: "We're not a broker or middleman... you'll be dealing directly with the source." Fiserv completed its acquisition of Merchant One, Inc. on 20 December 2022 for approximately $300 million, and said so in its 2022 annual report on Form 10-K, describing Merchant One as an independent sales organization focused on restaurant, retail and ecommerce merchants and folding it into the Acceptance segment. Merchant One's own footer, meanwhile, registers it as an ISO of three banks — KeyBank, Citizens Bank and Pathward — and its POS page sells Clover, which is a Fiserv brand.

This matters for one very practical reason. If you are shopping around and collecting quotes from Merchant One and from a Fiserv or Clover reseller, you are not getting two independent bids. You are getting two doors into the same building.

The rate table, and what "qualified" means

Give Merchant One credit for putting numbers on a public page: $0.00 setup, 0.29%–1.55% swiped, 0.29%–1.99% keyed, $13.95 per month, interchange-plus available. Most independent sales organisations publish nothing at all, and the disclaimer under the table honestly says these are qualifying rates and that the executed merchant processing agreement overrides them.

But read the label. These are qualified rates, which means this is a tiered pricing plan. Under tiered pricing every transaction is sorted into a qualified, mid-qualified or non-qualified bucket, and only the first gets the advertised number. Consumer rewards cards, business and corporate cards, keyed-in sales, card-not-present sales and late batches all downgrade — and Merchant One publishes no rate for any of the downgraded tiers. A merchant with a normal modern card mix will see a large share of volume land outside the qualified tier. The advertised 0.29% is therefore not a price. It is the best case at the bottom of a range whose top you cannot see.

The fix is on the same table: interchange-plus is listed as available. Interchange-plus prices every transaction as the card networks' own wholesale cost plus one fixed markup, so there are no tiers to fall out of and the quote can be compared like for like against anyone else. Ask for it as basis points plus cents per transaction, in writing. If it is refused, you have learned what the tiered deal was for.

There is one more wrinkle worth naming, because it is the kind of thing that decides a quote. Sources disagree about what Merchant One's pricing model actually is. Its own table says "Qualified" — tiered language — and also says interchange-plus is available; business.com, updated in June 2025, simply describes the company as using interchange-plus. We could not settle it from the outside, and you should not have to. Ask which structure your agreement is on and get the answer in writing before you sign.

Two review scores, two different companies

Merchant One has 4.9 out of 5 on Trustpilot across 27,320 reviews — nearly 11,000 in the last twelve months, 96% of them five stars, ranked first in Trustpilot's Card Processing Service category. It also has a customer review average of 1.02 out of 5 across 56 customer reviews on its BBB profile, and a complaints page showing 198 complaints in the last three years with 56 closed in the last twelve months.

Both are real, and the explanation is in what each set of reviews is about. The Trustpilot entries are short, warm and specific about people: a named account manager who called back, a support agent who fixed a batch. That is exactly the corpus a review request sent at the end of a support call produces, and it says something genuinely positive — Merchant One's staff are reachable and helpful, which is not universal in this industry. The BBB entries are about money: unauthorised debits, fees nobody mentioned, held funds, and being charged to cancel after being told there was no contract. Those are complaints people file after the relationship has soured, and they are pointed at pricing and paperwork rather than at people.

One more trap here. The BBB profile shows an A+ rating while stating the business is not BBB accredited. The A+ is a grade for how a company handles complaints, not a measure of customer satisfaction — a company can hold A+ and 1.02 stars at the same time, and this one does. Anyone quoting the A+ at you as evidence of merchant happiness is either confused or hoping you are.

Contract, equipment and the things to nail down

Merchant One publishes no contract length and no cancellation fee. Independent reviewers describe a three-year term with an early termination fee of up to $750 for every year left to run. Equipment comes via a terminal placement program or on "flexible lease terms", and processing equipment leases are routinely separate, non-cancellable agreements written by a third-party lessor that survive the closure of the merchant account itself.

So before you sign: get the interchange-plus markup in basis points and cents; get the term length and the exact exit fee written into the agreement, not described on a call; find out who the lessor is on any equipment lease, what the total of all payments over its life comes to, and whether it can be cancelled separately. Merchant One is a workable processor for a small business that wants a human being on the phone. It is a poor one for a merchant who signs what is put in front of them.