Stax by Fattmerchant Review

flag Flat fee, 0% markup payment processing
  • Average monthly savings of 40%

  • 24/7 Support, Trusted by 30,000+ businesses

  • Award winning payment processor

  • Seamlessly accept every payment type

Pros & Cons

  • Quickbooks integration
  • Monthly pricing with no percentage markups
  • Omni Integrated Payments business tools
  • Clear pricing
  • Expensive for low-volume businesses
  • US-based merchants only at this time
  • Not many other integrations listed

Plans & Pricing


  • For a limited time, try out Stax and get your first month for free*!
  • Terms & conditions for Stax apply

Stax by Fattmercant has one main plan available. Stax offers new customers a free demo to help them decide before buying.

Merchant Processing

This plan costs $99/month + $0.08/transaction & direct cost (swiped payments) or $0.15/transaction & direct cost (keyed payments). It offers various analytics tools, card-present technology for swiped payments, and cloud tech for keyed payments. You also have access to in-house chat, email, and phone support.

Stax also provides an Omni software and the membership pricing model makes Stax a great option for established or higher-volume businesses that process payments via invoice or subscriptions. Stax offers an excellent value with interchange-plus pricing and very low flat-rate transaction fees.


First month FREE*

*Term and conditions apply as per Stax’s policies


Merchant Processing


In an industry full of solutions that charge a large markup percentage pricing on transactions, it’s refreshing to see products that do a fixed membership pricing model instead. Stax by Fattmerchant is one of these. However, the pricing model isn’t the only reason to consider Stax. It offers so much more, and you can read about it below.


  • "Price"
    8 /10
  • "Features"
    9.5 /10
  • "Ease of USe"
    9 /10
  • "Help and Support"
    10 /10

Features and Functionality

Omni Integrated Payments

Any tools that consolidate information in your business are helpful. They streamline things and make it easier to find the information you need.

That was the thought behind Omni Integrated Payments. This aggregates your transaction data into one place. However, it brings about many other features (one of which is covered next) that you can use for business purposes.

Customer Database

Customer data helps you make better decisions when it comes to marketing. Stax by Fattmercant helps you in this area by offering a customer database that tracks information like payment methods, purchase history, and similar things. You can use some of this information to better market your products or services in the future.

eCommerce Shopping Cart

Stax can integrate with your current shopping cart that your customers know or let you create a brand new one that works for your business. They’ve partnered with several gateways to enhance your site’s functionality.


Got developer smarts? Or maybe you know a developer? In any case, Stax offers an API for businesses that have unique software needs with their payment processing.

Reporting and Analytics

Stax’s Omni Integrated Payments offer some admittedly basic but still useful reporting features. You can check out data on your transactions, sales, item categories, and more.

Hardware Requirements

Stax is a cloud-based application, making it usable on Mac or PC — as long as you have an Internet connection. Stax also has iOS and Android apps so you can take your payment processing on the go.

Integrations & Add-ons

Stax by Fattmercant doesn’t have a whole lot of integrations listed. The one it seems proud of is its Quickbooks integration. By integrating your Stax payment processing with Quickbooks, your accounting (as it pertains to your sales and revenue) becomes a lot easier. Stax also integrates with various PoS systems, but again, they don’t make it clear which ones. You may have to contact your PoS provider and find out.

Ease of Use

Stax by Fattmercant is quite easy to use as a payment processor, especially its Omni portal. Even so, Stax provides you with a tutorial on using the portal. Not much else to say here. As we’ll discuss again, their customer support is quite helpful as well.

Customer Support

Stax offers strong customer support through a variety of avenues. Customers with the higher-tier plans get priority support through a dedicated account manager and expedited service request resolutions.

  • 24/7 Help & Support
    Support is available 24/7.
  • Phone Support
    Stax by Fattmercant customers can reach the support team by phone at 407-982-1782.
  • Email
    You can reach Stax’s support team with technical issues by submitting a request on their contact page.
  • Video Tutorials
    Stax by Fattmercant's YouTube channel has plenty of video tutorials and walkthroughs for various Stax functions.
  • FAQ
    Stax has a large, self-service Knowledge Base covering a wide range of topics pertaining to using the platform.
  • Blog
    Stax’s blog covers general business tips, industry-specific payment processing topics and even offers several comparison articles weighing Stax against its competitors.

Final Word

Overall, Stax by Fattmercant offers some excellent pricing, and it’s quite transparent as well. Its Omni Channel Payments provides some superb functionality, and the Quickbooks integration is helpful as well. The pricing might be prohibitive to smaller and low-volume businesses, but if you’re seeing strong sales growth, consider Stax.

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Andrew Omalley>
Andrew Omalley

Andrew is a freelance writer who has been crafting valuable pieces of content relating to personal finance for more than five years. Previously, he studied Economics & Finance at university and he has professional qualifications relating to financial advice.

We make the best effort to present up-to-date information; however, the terms of each offer can be revised according to the service provider’s discretion. The above shall not be considered as an expert or professional advice for any matter.

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