Stax Payments Review 2023 (formerly Fattmerchant): Pricing, Features, Alternatives

Here's what to know about Stax, a merchant service provider previously branded as Fattmerchant.
Lisa Anthony
Randa Kriss
By Randa Kriss and  Lisa Anthony 
Edited by Sally Lauckner

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NerdWallet rating 

Stax (formerly called Fattmerchant), is a merchant services provider known for its subscription-based pricing and 0% markup on interchange rates. It may be a good fit if you process a minimum of $5,000 in credit card transactions monthly and are looking for low interchange fees.

Stax By Fattmerchant Payment Processing

Stax by Fattmerchant
NerdWallet rating 
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on Stax by Fattmerchant's website

Deciding factors

Payment processing fees:

Interchange plus 8 cents to 15 cents.

Monthly fee:

Plans for small businesses:

  • Growth: $99 per month.

  • Pro: $159 per month.

  • Ultimate: $199 per month.

Hardware cost:

$300 for a corded card reader. Merchants will need to purchase other hardware elsewhere.

Accepted payment methods:

In person, online, keyed, mobile and invoiced.

Contract length:

No contracts.

Customer support:

24/7 technical support through an electronic ticketing system. Phone, chat and email customer support through a team based in the U.S. An online knowledge base is also available.


Supports integrations such as QuickBooks, Xero, Wave, Zoho, Mailchimp and Hubspot.

Stax Payments pricing and features

For a monthly subscription fee with no contract required, users can access Stax’s payment platform and also receive a payment terminal of their choice. Stax offers three monthly subscription-based plans for small businesses that process up to $500,000 annually. Custom pricing is available for businesses that exceed this limit.

Stax’s payment platform offers no markup on interchange rates, but you will pay processing fees in addition to the monthly subscription fee:

  • Interchange rate plus 8 cents per in-person transaction.

  • Interchange rate plus 15 cents per manually entered transaction.

Here's what's included in each of the Stax subscription plans:

Growth: $99 per month

The Growth subscription includes:

  • Free terminal or mobile reader.

  • Automated clearing house, or ACH, transaction processing.

  • Free surcharging capabilities.

  • Basic dashboards and analytics.

  • Next-day funding options.

  • Payment card industry, or PCI, compliance tools and support.

Pro: $159 per month

The Pro package includes everything in the Growth plan, plus:

  • Digital invoicing.

  • Text-based mobile payments.

  • Payment links to include on websites.

  • Secure way to keep customer credit cards on file.

  • Integration with accounting software, including QuickBooks Online.

  • Application programming interface, or API, key integration capabilities.

  • Enhanced dashboards and reporting.

Ultimate: $199 per month

The Ultimate plan includes all the above features, plus:

  • Automatic updates for stored credit cards (for example, updated card numbers if the cards expire.)

  • One-click shopping cart setup with catalog management for an online store.

  • Advanced dashboards and reporting.

  • Data exports (e.g., transactions, customers).

Optional add-on features

  • One-click shopping cart.

  • QuickBooks Online Pro sync.

  • Terminal protection.

  • Custom branding.

  • Same-day funding.

  • Digital gift cards.

  • Surcharging.

  • Lower rates for card-not-present transactions.

Stax Payments benefits

0% markup on interchange rate

Unlike some payment processors, Stax’s pricing doesn’t include a markup on the interchange rate charged by credit card companies. Instead, Stax charges a monthly subscription fee to cover costs in addition to a processing fee. This pricing model may result in lower costs for some businesses. Stax’s pricing generally becomes competitive with other pricing models when a business’s monthly savings from the lower interchange rates offsets the monthly subscription cost of the service.

Unique add-on features

Stax offers some distinct add-on features that can be used to further customize its plans. You can set up an online store quickly with the one-click shopping cart feature or use another feature to sell gift cards online. Brand customization tools are available for invoices, receipts and payments. Add-on features such as surcharging and lower interchange rates for card-not-present payments can help you reduce the cost of payment processing.

Stax Payments drawbacks

Not a good option for businesses with low sales

Stax’s subscription-based pricing model with low processing fees can be beneficial for some businesses, but does work for everyone. If you process a smaller volume of monthly sales, the amount you save might not be enough to offset the subscription fee. In fact, Stax acknowledges that its high monthly subscription amounts aren’t cost effective for businesses with low transaction volume. Stax considers a low transaction volume to be $5,000 per month.

Pricing transparency

Stax states that it’s committed to transparency, but it offers little information about pricing except for monthly subscription fees. Other payment processors provide more detailed pricing information such as processing fees, chargeback fees, closure costs and other costs. Knowing the total cost of the services offered by Stax would be helpful when you’re comparing it to other payment services.

Stax By Fattmerchant Payment Processing

Stax by Fattmerchant
NerdWallet rating 
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on Stax by Fattmerchant's website

Alternatives to Stax Payments



NerdWallet rating 
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on Helcim's website


  • Interchange plus 0.3% and 8 cents per in-person transaction (if less than $25,000 in monthly card transactions).

  • Interchange plus 0.5% and 25 cents per online transaction (if less than $25,000 in monthly card transactions).

  • Interchange plus 0.5% and 25 cents per manually keyed transaction (if less than $25,000 in monthly card transactions).

  • 0.5% plus 25 cents for ACH payments.

Why we like it: Helcim is a merchant account provider that offers in-person and online payment options for businesses. Helcim card readers are $109. Helcim offers a variety of other features, such as unlimited invoicing, a self-service customer portal and the option to set up an online store.


Square Payments

Shop Now

on Square's website


  • 2.6% plus 10 cents for in-person transactions.

  • 2.9% plus 30 cents for online transactions.

  • 3.5% plus 15 cents for manually keyed transactions.

  • 3.3% plus 30 cents for invoices.

Why we like it: Square offers custom pricing to businesses that process more than $250,000 annually. You don’t have to sign a contract with Square, and you can set up a free online store. Dispute management, fraud prevention and an offline operating mode are additional features offered with the service.

Dharma Merchant Services


  • Interchange plus 0.15% + 8 cents for in-person transactions.

  • Interchange plus 0.20% + 11 cents for online transactions.

  • Interchange plus 0.25% + 8 cents for in-person AmEx transactions.

  • Interchange plus; 0.30% + 11 cents for online AmEx transactions.

Why we like it: Dharma Merchant Services works with small businesses, retail, restaurants, online sales, health care, hospitality and other industries. Discounts are available for merchants that process more than $100,000 or 5,000 transactions per month and for restaurants with average tickets of less than $25. Dharma charges a $25 monthly fee, which is less than Stax. You’ll also pay a $49 account closure fee.

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A version of this article was first published on Fundera, a subsidiary of NerdWallet.

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