Best Payment Processors · pricing · Updated June 2026
Stax (by Fattmerchant) pricing (2026)
Stax (by Fattmerchant) starts at $99/mo (Subscription (up to $150K/yr)), across 3 plans. Best for Established SMBs processing $120K+/year wanting to eliminate percentage markups. Every figure links to Stax (by Fattmerchant)'s own page and the date we captured it.
At a glance
- Entry price: $99/mo (Subscription (up to $150K/yr))
- Free tier: No
- Compliance: HIPAA No · SOC 2 — · GDPR —
- Best for: Established SMBs processing $120K+/year wanting to eliminate percentage markups; Businesses with predictable high transaction volumes benefiting from flat-fee subscriptions; Merchants who want an all-in-one payments platform with CRM and invoicing tools
Stax (by Fattmerchant) plans & pricing
| Plan | Monthly | Annual | Billing | Notes | Source |
|---|---|---|---|---|---|
| Subscription (up to $150K/yr) | $99 | — | flat | Membership pricing at 0% markup over direct-cost interchange. For annual processing up to $150K: $99/month subscription plus per-transaction interchange + $0.08 in-person (EMV terminal) or interchange + $0.15 online/keyed. No percentage markup. monthlyUsd corroborated via review since the official page returned 403. | staxpayments.com |
| Subscription ($150K-$250K/yr) | $139 | — | flat | Membership pricing at 0% markup over interchange. For annual processing $150K-$250K: $139/month subscription plus interchange + $0.08 in-person or interchange + $0.15 online/keyed. monthlyUsd corroborated via review since the official page returned 403. | staxpayments.com |
| Subscription ($250K+/yr) | $199 | — | flat | Membership pricing at 0% markup over interchange. For annual processing $250K+: from $199/month subscription plus interchange + $0.08 in-person or interchange + $0.15 online/keyed. monthlyUsd corroborated via review since the official page returned 403. | staxpayments.com |
Last verified 2026-06-13. https://staxpayments.com/pricing/ (official; membership/subscription model at 0% interchange markup. The official page returned HTTP 403 on fetch, so per-tier subscription $/mo and per-transaction cents were corroborated via a 2026 pricing review) Cross-checked against business.com.
Capabilities
Integrations: QuickBooks, Xero, WooCommerce, Shopify, Authorize.net, Salesforce, Zapier.
Key features: 0% interchange markup — flat per-transaction cents only above direct interchange cost; Subscription model saves high-volume merchants vs. percentage-based processors; All-in-one: invoicing, recurring billing, virtual terminal, and reporting included; PCI DSS compliant platform; Dedicated account manager on higher tiers.
Plan limits: Minimum $99/month subscription regardless of processing volume; Designed for businesses processing at least $5K–$10K/month to break even vs. flat-rate processors; No percentage markup over interchange on any plan.
Frequently asked questions
How much does Stax (by Fattmerchant) cost?
Stax (by Fattmerchant) starts at $99/mo (Subscription (up to $150K/yr)); it has 3 published plans. Verified 2026-06-13.
What are cheaper alternatives to Stax (by Fattmerchant)?
Cheaper payment processors than Stax (by Fattmerchant) (entry $99/mo) include Authorize.net at $25/mo. Verified 2026-06-13.
Does Stax (by Fattmerchant) support HIPAA?
Stax (by Fattmerchant) HIPAA support: No. SOC 2: —. GDPR: —.
Does Stax (by Fattmerchant) have a free plan?
Stax (by Fattmerchant) free tier: No.
Stax (by Fattmerchant) vs alternatives
Compare all payment processors → · Stax (by Fattmerchant) alternatives → · Open data · MCP
Cheaper payment processors alternatives
- Authorize.net from $25/mo