Main St. Merchants

Preferred Payments+

SUPER FUNCTIONAL 0.25% PAYMENT PROCESSING-with Optional Integrated Tax Services Built-In.

Now helping to Fight Hunger with The GoodPayments Project.



Main St. Merchants is a Preferred Merchant Payment Processing Agency based in Denver, CO, with offices and agents across the U.S. We install, program and deploy credit card terminals, POS systems, ECommerce gateway integration, mobile credit card terminals, and more. We provide FREE Authorize Net services. We provide the connection to the most reliable and low cost U.S based processing networks.

Our Artificial Intelligence software finds the lowest rates for your transactions in milliseconds - saving your business precious percentage points in fees.

The GoodPayments Project: Beginning in 2019, all new merchant accounts will generate donations each month to Feeding America®, the U.S.' largest domestic hunger relief organization. We feel strongly about this - especially when it comes to children. We have written a specific algorithm to generate donations based on a business' monthly volume and transactions.

In addition to our payments and marketing services, we also offer Professional Tax Services for our clients, at much-reduced rates. Sole Prop/S Corp/LLC/Partnerships and Non-Profits. Our tax pros have over 3000 cases and 15 years worth of experience, in both tax prep and tax resolution. With our active Enrolled Agent status, we can act as your liaison with the tax authorities - most of the time for no cost (for merchant clients). Save time and stress! We would love to help protect your business, and help it succeed.

Update: We have partnered with Gusto®, a leading provider of cloud-based payroll and benefits services. Business owners can now easily process and manage their payroll and benefits, for much lower cost than existing legacy services. And since we help with support, the time savings in enormous!
Check out Gusto® here!



We have been in the processing industry for more than 20 years. Our clients come to us for ultra-low rates, no risk and great service. We have evolved from strictly payment processing services to a one-stop shop - a team to support your business in the areas of card services, digital online marketing, and tax services. We provide and reprogram all major brands of credit card terminals, online gateway services, and POS Tablet systems. In addition, we have developed The GoodPayments Project®, which donates to Feeding America® each time you accept a credit card at your business. This remarkable service will help others, even as you save on processing fees.
Call us at 800-422-9483 or send us an email or contact page.




We love our clients! We are proud of our quick response times, and the way we help business owners succeed. Let us know if we can make your life a little easier. From a simple reprogram of your existing equipment, to a full scale rollout of a POS system, we can help. Online Processing and ECommerce Gateways, too! Free Authorize Net online gateway processing services and invoicing included. Free Back-up Credit Card Terminal included.

No Cancel Fees - Next Day Funding - No Risk - Award Winning Platform

Terminals & POS Tablets

Online ECommerce Gateways


The GoodPayments Project

Video & Social Media Marketing
Professional Tax Services




From Auto Repair Shops, to Golf Course & Volleyball Gyms, to Restaurants and everything in between, including Online Retail and Service Based Businesses. We can handle your payment processing needs. Our clients utilize Credit Card Terminals, POS Systems, Online Gateways, and even Online Invoicing.

Here's what one of our clients had to say:

"John and his team have helped me tremendously, both in saving a large amount of money on fees, and in their other services. We also utilize their tax services and local ads services, and we couldn't be more happy with the responsiveness and expertise from Main St. Merchants"
FM - Atascadero CA




We utilize a network of platforms across the U.S. to connect your processing to the fastest, most reliable networks. Our support is U.S. Based and 24/7. You will have our email address, phone number, and even text contact. Call 800-422-9483 or send us a contact page message.








Contact us for a quote today.

Interchange Services Inc.

Main St. Merchants

Littleton CO
Capistrano Beach CA


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Main St. Merchants is an authorized MSP/Agent for the following banks, processors and ISOs: First Data | Global Payments | TSYS | Clearent | Worldpay | Central Bank of St. Louis | Wells Fargo N.A. | Deutsche Bank NY