The Best Alternatives to Adyen for SaaS Platforms

SaaS companies usually look past Adyen for three concrete reasons. Adyen’s average implementation runs 5 to 6 months, it carries a monthly invoice floor of roughly €1,000, and its aggregator model pushes underwriting responsibility for sub-merchants back onto the platform itself. For mid-market software businesses that want to monetise payments without standing up enterprise infrastructure, those constraints are the trigger to evaluate other providers.

The list below applies a consistent set of criteria across each option so the comparison stays on the same footing.

Evaluation Criteria for SaaS Payment Platforms

The platforms below are assessed against the same set of factors that matter most to a software company adding payments:

• Pricing model (interchange-plus, flat-rate, or subscription).
• Underwriting responsibility for sub-merchants.
• Depth of white-label, including dashboards, statements, and merchant communications.
• Support for a path to full PayFac ownership.
• Time to first live transaction.
• Geographic and currency coverage.
• Vertical fit and any restrictions on high-risk industries.

A platform processing $50 million in annual volume typically earns 5 to 15 basis points under a referral arrangement and 5 to 10 times more under embedded payments, so the choice of provider has direct revenue consequences.

Finix

Finix is a full-stack processor headquartered in San Francisco with direct certifications to Visa, Mastercard, American Express, and Discover. Transactions settle on Finix’s own rails rather than passing through a third-party processor, which is the structural reason it can offer interchange-plus economics and a PayFac progression that other aggregators cannot.

The product is built around a tiered model. Platforms can begin with Finix Flex, which provides managed merchant onboarding and revenue share without forcing the platform to register as a PayFac on day one. As volume grows, platforms can move to full PayFac ownership on the same infrastructure rather than re-platforming. Pricing is offered as interchange-plus or fixed-rate, with reported card-present economics around 8 cents plus interchange and card-not-present around 15 cents plus interchange, on a monthly subscription that starts at $250.

Dashboards, statements, onboarding flows, and merchant communications can be fully white-labeled. Underwriting, KYC, KYB, AML, and MATCH list screening are handled through managed API workflows so the platform does not have to build that compliance stack itself. Finix states that platforms can go live in as little as one day using three API endpoints. Reported customers include Clubessential, Passport Labs, and Kabbage. The main constraint is geography, since Finix is focused on the US and Canada and is a poor match for platforms with substantial cross-border volume.

Stripe Connect

Stripe Connect is the most widely adopted embedded-payments option for SaaS platforms and marketplaces, with users that include Shopify, DoorDash, and Spotify. It is the default many product teams reach for when they need to get payments live quickly, and that strength is real.

The trade-offs show up at scale. Stripe uses a flat-rate aggregator model priced at roughly 2.9% plus $0.30 per online card transaction in the US, with Connect-specific platform fees layered on top. Flat-rate pricing is simple, but it becomes the most expensive option once monthly volume crosses the threshold where interchange-plus economics would deliver meaningful savings. Direct merchants moving from flat-rate to interchange-plus report savings of 30 to 40 percent on credit-card processing costs, which gives a rough sense of the spread.

Branding is the other consideration. In Standard Connect, Stripe owns the merchant relationship, and Stripe branding appears in payouts, statements, and merchant emails unless the platform implements Express or Custom flows. Those flows are available but require additional engineering and compliance work. Stripe’s global footprint, breadth of features, and SDK quality remain strong reasons to choose it, particularly for platforms with international merchants and limited appetite for building payment infrastructure.

Worldpay for Platforms (Formerly Payrix)

Worldpay for Platforms is the rebrand of Payrix following Payrix’s 2022 acquisition by FIS and the subsequent Worldpay spin-out. The product targets enterprise software companies with complex merchant hierarchies and global operations, drawing on Worldpay’s underlying acquiring network for scale.

Economics are most favorable for ISVs running high-volume, low-risk merchant cohorts, where the underlying acquiring relationship can be priced aggressively. Sub-merchant flows can be fully white-labeled, including statements and onboarding, which puts it on similar footing with Finix on branding even though the corporate context and pricing structures differ. For smaller SaaS platforms or those with single-vertical focus and modest merchant volumes, Worldpay for Platforms is heavier than the use case requires, and onboarding timelines match that enterprise orientation.

Stax Connect

Stax Connect is Stax’s embedded-payments product for software vendors. It uses a flat-subscription pricing model rather than per-transaction markup, which favors ISVs whose merchant cohorts process under approximately $150,000 annually per merchant. For software platforms serving small businesses with low average ticket sizes and lower-volume accounts, that math can be attractive.

The brand surface is co-brandable rather than fully white-label. The Stax identity remains visible in merchant contracts and statements, which is acceptable for some platforms and a deal-breaker for others depending on how central payments are to the product. Stax Connect also does not offer the same Flex-to-Full PayFac progression path that Finix provides, so platforms expecting to grow into full PayFac ownership should weigh that against the simpler subscription model.

Braintree (PayPal)

Braintree, owned by PayPal, processed approximately $250 billion in 2023 as part of PayPal’s enterprise payments platform. It uses interchange-plus pricing with volume discounts and supports 45+ countries and 130+ currencies, which makes it a credible global option.

The relevant restriction for SaaS platforms is in Braintree Marketplace, the product that supports sub-merchant splits and service fees. Braintree Marketplace requires both the master merchant and the sub-merchants to be domiciled in the United States. That rule eliminates Braintree as a fit for platforms with international sub-merchant rosters even when the platform itself is US-based. For US-only marketplaces and SaaS platforms that value PayPal’s brand presence at checkout, Braintree remains a serious contender with proven scale.

NMI

NMI provides full-stack processing, gateway, and acquiring services for ISVs and SaaS builders that want embedded payments without taking on full PayFac responsibility. The product is gateway-and-processor agnostic, which gives platforms flexibility to mix and match downstream providers rather than being locked into a single rail.

NMI supports both card-present and card-not-present use cases, which matters for SaaS platforms with hybrid commerce flows such as field-service software, hospitality tooling, or retail point-of-sale extensions. The provider sits closer to infrastructure than to a turnkey PayFac product, so platforms choosing NMI should expect to invest more engineering effort in stitching the pieces together.

Checkout.com

Checkout.com is frequently evaluated by SaaS platforms with substantial international volume. The company reports a 3.8 percent authorisation uplift from intelligent routing, which is a measurable revenue lever for platforms whose merchants run cross-border or multi-currency transactions at scale.

The orientation is enterprise and global, similar in some respects to Adyen. For domestic US or Canadian SaaS platforms with no international footprint, Checkout.com is more capability than the workload requires. For platforms with cross-border merchants, the authorisation economics and currency coverage can offset the additional implementation effort.

Choosing Among the Alternatives

The right answer depends on three factors, which are the geography of the merchants, the pricing model the platform prefers, and the amount of PayFac control the platform expects to own as it grows.

For US and Canadian SaaS platforms that want full white-label, interchange-plus economics, and a path from managed onboarding to full PayFac, Finix is the closest structural alternative to Adyen for Platforms with materially lower onboarding friction. Stripe Connect remains the right call for platforms prioritising speed of integration and global reach over pricing efficiency at scale. Worldpay for Platforms fits enterprise ISVs with large, low-risk merchant cohorts. Stax Connect suits ISVs whose merchants run small annual volume. Braintree is a fit for US-only marketplaces leveraging PayPal’s presence. NMI is for teams that want infrastructure flexibility, and Checkout.com is for platforms with serious international merchant volume.

Frequently Asked Questions

Why do SaaS platforms switch away from Adyen?

The most cited reasons are Adyen’s 5 to 6 month implementation timelines, a minimum monthly invoice of about €1,000, and an aggregator model that pushes sub-merchant underwriting responsibility back onto the platform. Mid-market SaaS companies also report rigidity around custom pricing and onboarding flows.

What is the minimum volume to use Adyen?

Adyen does not publish hard minimums, but it typically imposes a minimum monthly invoice near €1,000 in fees and is generally recommended for merchants processing $500,000 or more per month. Below that threshold, the minimum-fee floor materially raises the effective rate.

How much does Adyen charge per transaction?

Adyen uses Interchange++ pricing with a fixed processing fee around €0.11 per transaction plus a payment-method markup. Adyen for Platforms adds approximately $0.13 USD on top of interchange plus an additional percentage tied to the payment method.

What is embedded payments?

Embedded payments integrate payment processing directly into a software platform so end users transact without leaving the product, and the platform earns a share of payment volume. The platform owns onboarding, processing, payouts, and reporting inside its own product interface.

What is a PayFac?

A payment facilitator, or PayFac, is a master merchant that onboards smaller sub-merchants under its umbrella, handles their compliance and underwriting, and lets them accept payments without each opening a direct merchant account.

What is PayFac-as-a-Service?

PayFac-as-a-Service lets a software platform monetise payments and own the merchant relationship without taking on the full $1 million to $3 million annual compliance and infrastructure cost of becoming a registered PayFac itself. The provider absorbs most of the operational and regulatory load.

What is the difference between an ISO and a PayFac?

An ISO, or Independent Sales Organisation, resells merchant accounts on behalf of an acquiring bank and does not create sub-merchants. A PayFac aggregates many sub-merchants under one master merchant account and handles their underwriting and compliance directly.

How much can a SaaS platform make from embedded payments?

A SaaS platform processing $50 million annually under a referral model typically earns 5 to 15 basis points on volume. An embedded-payments or PayFac model can generate 5 to 10 times more revenue from the same volume by capturing a much larger share of processing margin.

What is interchange-plus pricing?

Interchange-plus pricing passes through the actual card-network interchange cost on each transaction and adds a fixed processor markup. The result is more transparent margin compared with blended flat-rate pricing where the markup is bundled into a single percentage.

What is the difference between integrated payments and embedded payments?

Integrated payments usually refer to a referral or gateway arrangement with a third-party processor, where the merchant relationship lives outside the SaaS product. Embedded payments natively own the entire merchant flow inside the product, including onboarding, processing, payouts, and reporting.

What is PCI scope and how do embedded payments reduce it?

PCI scope is the set of systems that touch cardholder data and must be audited for PCI DSS compliance. Embedded-payments providers like Finix reduce that scope by using tokenised iframes and hosted fields, so card data never touches the platform’s own servers.

How long does it take to integrate Finix?

Finix states that platforms can go live in as little as one day using as few as three API endpoints. The same infrastructure also exposes thousands of configuration options for teams that need deeper customisation.