Helcim vs Stax vs Fattmerchant for mid-market in 2026
- Helcim and Stax both pitch subscription pricing (flat monthly + interchange passthrough) — attractive model at certain volumes.
- Break-even vs interchange-plus usually around $40-80k/month volume; above that, subscription saves money.
- Neither approves high-risk verticals; both are mid-market standard retail / e-commerce.
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Subscription pricing in merchant services — flat monthly fee + interchange passthrough without markup — became mainstream in the mid-market through Helcim and Stax (formerly Fattmerchant, rebranded 2021). For operators in the $30k-$500k/month range doing standard-risk business, these models can save meaningful money over traditional interchange-plus. But not always, and not for every vertical.
1. The subscription pricing model
Flat monthly membership fee ($99-$199+). Interchange passes through at cost. Processor margin comes from the subscription, not per-transaction markup. Math: at $100k/month volume, typical interchange is $2,500-$3,500. Add processor margin of 0.2-0.4% = $200-$400. Subscription model replaces that with flat $199 = savings if processor margin was higher.
2. Helcim specifics
Based in Calgary, serves US and Canada. No monthly minimum at lower tiers; graduated subscription pricing. Interchange passes through. Gateway included. Decent POS and online tools. Reputation for transparency.
3. Stax (Fattmerchant) specifics
Based in Orlando, US-focused. Membership fee $99-$199+/month. Interchange passes through. Fuller-featured omnichannel platform with POS, online, virtual terminal. Strong brand in mid-market.
4. When subscription pricing wins
Around $40-80k/month volume, subscription pricing breaks even against typical interchange-plus at 0.15-0.25% markup. Above $80k/month, subscription is typically cheaper. Above $500k/month, enterprise interchange-plus beats subscription because markup drops to 0.05-0.15%.
5. When subscription pricing loses
Under $30k/month volume, flat $199 monthly dwarfs per-transaction savings. Stay on transactional pricing.
Over $500k/month, enterprise IC+ cheaper than subscription because margin already compressed.
High chargeback (>0.9%) operators: subscription models do not suit; specialty high-risk required.
6. Vertical fit
Both Helcim and Stax serve standard e-commerce, professional services, retail, restaurants. Neither approves: CBD, kratom, peptides, SARMs, adult, firearms, gambling, high-risk nutra. For those, specialty high-risk required regardless.
7. Integration ecosystem
Helcim: Shopify, BigCommerce, WooCommerce, QuickBooks, Zapier. Solid but not exhaustive.
Stax: similar list plus some franchise-focused integrations.
Both work for most SMB e-commerce needs. Enterprise integrations often go to Fiserv, Chase Paymentech, or Worldpay.
8. Customer support
Both have stronger US support than big-box acquirers. Helcim has a reputation for transparency and quick response. Stax has broader business hours and dedicated account management at higher tiers.
9. Reporting and analytics
Both have decent dashboards. Stax's is more polished; Helcim's more raw but exportable. Neither matches enterprise reporting (Adyen, Checkout.com) but exceeds what you get from Square.
10. Terminal hardware
Both offer Ingenico, Dejavoo, and Clover terminals through their programs. Pricing for terminals typically monthly lease or one-time purchase. Compare quotes.
11. ETFs and contract terms
Helcim: month-to-month, no ETF — operator-friendly.
Stax: month-to-month on some plans, annual on others. Modest ETF typical.
Both are less lock-in than traditional acquirer contracts.
12. What neither is
Neither is a high-risk processor. Neither is an enterprise-grade platform for $10M+/month operators. Neither handles multi-currency international like Adyen or Checkout.com. Both are mid-market standard-risk options.
Decision matrix
- $40k-$500k/month, standard risk, US-focused: Helcim or Stax strong options.
- Under $40k/month: Probably cheaper on Stripe or Square flat-rate.
- High-risk vertical: Neither; go specialty.
- Over $500k/month, want enterprise features: Graduate to Adyen / Checkout.com or direct acquirer.
- Multi-brand operator: Either works per brand; orchestration layers on top.
Alternative subscription-pricing options
Stripe does not offer subscription pricing (transactional only). Square similarly transactional. Payment Depot, Dharma Merchant Services offer similar subscription models. For broader view see multi-brand processors 2026.
How to pick between Helcim and Stax
Run a side-by-side quote. Include membership fee, expected interchange at your card mix, gateway fees, PCI, and any vertical-specific surcharges. The cheaper one at your volume wins. For standardized e-commerce, they typically come within 5% of each other.
When to add orchestration
If you grow past $500k/month or add multiple brands, subscription pricing becomes less useful. Orchestration across multiple acquirers gives you rail diversification, cross-brand analytics, and rate flexibility that single-acquirer subscription does not. See pricing, orchestration framing, or apply for a mid-market stack review.
13. The detailed rate calculation
For a $100k/month operator, 60% debit card / 40% credit card mix:
Stax $199/mo + interchange passthrough: ~$199 + ~$2,800 interchange = $2,999 monthly fee. Effective rate 3.0%.
Helcim $199/mo + interchange passthrough: similar structure, ~$2,999. Effective rate 3.0%.
Traditional IC+ at 0.25% markup: ~$250 + ~$2,800 interchange = $3,050. Effective rate 3.05%.
Near-parity. Subscription wins as volume grows because per-transaction markup scales faster than membership fee.
14. Hidden fees to audit
Both platforms can add: PCI non-compliance fee, chargeback fees, batch fees, monthly minimums at lower tiers, early termination fees. Read the MSA; most fees are waivable at negotiation.
15. Terminal and POS fit
Stax: POS hardware (Dejavoo, Clover) through their program. Well-integrated with restaurant and retail POS scenarios.
Helcim: similar hardware, slightly different integrations. Offers in-house iOS/Android apps.
For restaurant operators, Stax POS tooling is more mature.
16. Support experience differences
Helcim: documented high transparency, quick response on support tickets, Canadian business hours extend.
Stax: dedicated account management at higher tiers, phone support US-based.
Both exceed typical big-box acquirer support quality.
17. When to leave either
Past $500k/month, subscription model starts losing to enterprise IC+ with dedicated account management (Fiserv, Chase Paymentech direct). Also past $500k, multi-acquirer orchestration becomes viable. Plan the transition at $300-400k/month so you are not scrambling at scale.