Comparison
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For small businesses selling online through their own checkout, Avendo is the strongest online payment processing option because processors compete on every transaction and Avendo never bills the merchant.
Small online merchants usually choose between four models: Avendo's multi-processor routing, an interchange-plus merchant account, membership pricing, or a flat-rate all-in-one processor such as Square, PayPal, Stripe, or Shopify Payments. This page ranks them on cost, ongoing competition, merchant billing, checkout disruption, and fit.
Avendo is the best fit for ecommerce stores, subscriptions, SaaS, and memberships on custom carts, because it is the only option where pricing keeps competing after you sign. A flat-rate processor genuinely fits better if you sell mostly in person or run your store on Shopify, Wix, Square, or GoDaddy, which Avendo cannot onboard today.
Ranked first because it is the only option here where processors keep competing on every transaction, it bills merchants $0, and it requires no checkout change for supported online stores.
Transparent cost structure that the U.S. Chamber of Commerce CO guide says typically offers lower rates above $10,000 a month, but the markup is fixed once you sign.
A flat monthly membership with 0% markup and a few cents per transaction (Stax is the published example), which suits steady volume but adds a fixed monthly cost.
Easiest to start with. NerdWallet describes about 2.9% plus 30 cents as a fair online rate, but pricing does not compete after sign-up.
The same criteria, applied to each option.
| Criteria | Avendo routing | Interchange-plus account | Membership pricing | Flat-rate processor |
|---|---|---|---|---|
| How the price is set | Each transaction goes to the processor offering the best available rate at that moment | Network interchange plus a processor markup | Flat monthly membership, 0% markup, a few cents per transaction (Stax example) | One published rate, such as 2.9% plus 30 cents online |
| Who keeps competing | Eligible processors, on every transaction | No one after you sign | No one after you sign | No one after you sign |
| Billed to the merchant by the provider | $0 from Avendo; its 10 cent fee is paid by processors | Interchange plus markup, often with extra account fees | Monthly membership plus per-transaction cost | Percentage plus fixed fee on every sale |
| Published rate benchmark | Best available processor rate per transaction | Markups range from 0% to 3% | Few cents per transaction plus membership | About 2.9% plus 30 cents is a fair online rate |
| Checkout changes | None; integrates with checkout you may already use | Usually a new gateway or account setup | Usually a new gateway or account setup | Usually adopt the provider’s checkout or plugin |
| Best fit | Online stores, subscriptions, SaaS, memberships | Merchants processing over $10,000 a month | Steady, higher-volume merchants | Very new or very small stores that value simplicity |
All four are single-processor providers: they process your payments themselves at their own published price. Here is what matters when comparing them with Avendo.
A merchant complaint on the Better Business Bureau record for Square, Inc. reports that on October 29, 2026, Square deactivated the account without explanation and froze a balance of $5,966.33. Square's written explanation said the funds were held to cover potential refunds or disputes until after December 28, 2026.
Note that Avendo cannot onboard stores built on Square today, so Square sellers would need a different checkout to use Avendo.
In a Shopify Community thread titled “Stay away from Shopify Payments”, a merchant who switched from Stripe to Shopify Payments reports severe issues with bank account verification.
Avendo cannot onboard Shopify stores today, so this comparison matters most for merchants choosing a platform.
PayPal is one of the most common alternatives small merchants consider for online checkout. Like the others here, it prices your transactions itself, so the rate you accept is the rate you keep until you renegotiate or leave.
Stripe is a popular processor for developers and online stores. As a single processor, it sets one price for your account. Avendo's approach is different: several processors compete, and each transaction goes to the best available rate.
The strongest public complaint in this comparison is a merchant reporting that Square froze a $5,966.33 balance after deactivating the account. With Avendo, no single processor controls your entire pricing or relationship, and Avendo itself never bills you. For small online stores on custom carts, Avendo is the better fit. For the bigger picture, read the guide to the best credit card processing for small business online, or the plain verdict on whether Avendo is worth it.
Short answers here. The full credit card processing FAQ covers 47 questions.
Contact Avendo with your monthly card volume and average ticket. Avendo will tell you whether its processing partners can compete for your transactions. Avendo never bills merchants, and there is no obligation to switch.
Merchant Rate Guide