Best Payment Processors · alternatives
Best Stax (by Fattmerchant) alternatives (2026)
7 alternatives to Stax (by Fattmerchant) in payment processors, ranked by entry price. Stax (by Fattmerchant) starts at $99/mo. Every figure links to the vendor's own page and the date we captured it.
Key takeaways
- Cheaper than Stax (by Fattmerchant): Authorize.net.
- Free alternatives: Square.
- Closest by price: Authorize.net ($25/mo), Adyen (—/mo), Braintree (a PayPal service) (—/mo).
Stax (by Fattmerchant) alternatives compared
| # | Alternative | Entry price | Free | HIPAA | Best for | Source |
|---|---|---|---|---|---|---|
| 1 | Authorize.net | $25/mo | No | No | Established SMBs wanting a gateway-only solution with their own merchant account | authorize.net |
| 2 | Adyen | — | No | No | Large enterprise and global retailers needing unified commerce | quote-only |
| 3 | Braintree (a PayPal service) | — | No | No | Enterprise merchants wanting PayPal/Venmo alongside cards in one integration | quote-only |
| 4 | Helcim | — | No | No | Small and mid-size businesses wanting transparent interchange-plus pricing | quote-only |
| 5 | PayPal | — | No | No | Consumer-facing e-commerce leveraging PayPal buyer trust | quote-only |
| 6 | Square | — | Yes | Yes | Small and mid-size retail, food & beverage, and service businesses | quote-only |
| 7 | Stripe | — | No | No | SaaS and subscription businesses | quote-only |
Data current through 2026-06-13. Compare any two directly on the Payment Processors index.