Stax

Stax

Paid

Subscription-based payment processing with zero markup on interchange

๐Ÿ’ณOnline Payments

About Stax

Stax (formerly Fattmerchant) offers a subscription-based payment processing model where merchants pay a flat monthly fee and receive interchange-direct rates with zero percentage markup. This model is highly cost-effective for businesses processing over $10,000 per month. Stax provides an all-in-one platform with online payments, POS, invoicing, ACH, and analytics.

ยท
Updated April 2026

What's Great

  • โœ“Zero markup on interchange rates saves significant money at higher volumes
  • โœ“All-in-one platform covers online, POS, invoicing, ACH, and analytics
  • โœ“Predictable monthly subscription cost simplifies budgeting
  • โœ“Built-in analytics and reporting provide actionable business insights

Watch Out For

  • !Monthly subscription fee makes it uneconomical for businesses processing under $10,000/month
  • !Per-transaction cent charge still applies on top of interchange
  • !Hardware options require separate purchase
  • !Setup can be more involved than plug-and-play solutions like Square

Common Use Cases

1

Mid-volume merchant processing $15,000+ monthly who wants interchange-direct rates

2

Business seeking a single platform for online payments, POS, and ACH processing

3

Retailer analyzing transaction data with Stax's built-in business analytics tools

Pricing Model

Paid

Paid subscription required. Check the website for current pricing and free trials.

Category

Online Payments

APIs and hosted checkout solutions for accepting payments on websites and in apps.

Tags

payment processingsubscription pricinginterchange-directzero markupcost savings

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