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 public page it was captured from — the vendor's own wherever the vendor publishes the number, otherwise the named public source — with 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 (—), Braintree (a PayPal service) (—).
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 STALE · 2026-09-03 | not priced monthly | No | No | Large enterprise and global retailers needing unified commerce | adyen.com |
| 3 | Braintree (a PayPal service) STALE · 2026-09-05 | usage-priced | No | No | Enterprise merchants wanting PayPal/Venmo alongside cards in one integration | paypal.com |
| 4 | Helcim STALE · 2026-09-03 | not priced monthly | No | No | Small and mid-size businesses wanting transparent interchange-plus pricing | helcim.com |
| 5 | PayPal STALE · 2026-09-03 | usage-priced | No | No | Consumer-facing e-commerce leveraging PayPal buyer trust | paypal.com |
| 6 | Square STALE · 2026-09-03 | not priced monthly | Yes | Yes | Small and mid-size retail, food & beverage, and service businesses | squareup.com |
| 7 | Stripe STALE · 2026-09-03 | usage-priced | No | No | SaaS and subscription businesses | stripe.com |
Data current through 2026-11-01. STALE marks a row whose price we have not re-checked at its source in over 30 days; a vendor with no published price is marked when any of its plans is. 6 of 7 rows above are marked. Compare any two directly on the Payment Processors index.