Which Is Better for Small UK Businesses?
Neither is suitable. Checkout.com and Adyen are built for enterprises and fast-scaling platforms, not for businesses processing a few thousand pounds a month.
If you are below £50k per month in card revenue, we point you toward Stripe, SumUp, or Square. Stripe charges a published 1.5% + 20p for UK consumer cards with no minimums. SumUp and Square offer straightforward in-person and online acceptance without enterprise contracts.
Once you are above £500k per month and have a development team ready for an enterprise integration, the Checkout.com vs Adyen question becomes meaningful. Below that, the minimum billing requirements make this a non-decision: you would pay for capacity you haven’t used.
Checkout.com vs Adyen Fees and Charges
Card Transaction Fees
Adyen charges interchange plus 0.60% plus £0.11 per transaction on its standard IC++ model. At scale or by negotiation, the 0.60% markup can be reduced. We sourced this from adyen.com, verified 15 September 2026.
Checkout.com doesn’t publish a rate card. It offers two structures: IC++ for merchants who want full transparency on interchange pass-through, and a custom blended flat rate for merchants who prefer predictable per-transaction costs.
For a merchant processing £1m per month in domestic consumer cards, IC++ generally produces lower effective rates than blended pricing at Adyen volumes. Blended pricing becomes attractive when your card mix is complex and you want a single line-item cost per transaction.
Monthly, Setup and Contract Costs
Neither provider charges a setup fee or monthly subscription. Checkout.com has no gateway fee in principle, but it applies minimum billing thresholds through a matrix of gateway, capture, and void fees when volumes fall short.
Adyen’s minimum monthly invoice is the practical floor, and Adyen sets its amount by industry rather than publishing it. Below that processing volume, you pay the minimum regardless of actual transaction count. It’s not a setup cost, but it functions like one for lower-volume merchants.
Both operate on bespoke commercial terms. Contract length and exit conditions are negotiated directly rather than published. Expect enterprise-standard terms with a structured notice period, not the rolling monthly cancellation you get from Stripe or Square.
Other Fees to Watch
Checkout.com charges variable settlement fees for both domestic GBP and international currency payouts. The exact fee depends on currency corridor and payout frequency. Confirm these with the sales team before signing: they’re not listed on the public website.
Chargeback fees apply on both platforms. Adyen’s RevenueProtect risk engine reduces chargeback incidence through device fingerprinting and velocity checks. Checkout.com uses native 3DS2 and machine-learning fraud monitoring to the same end.
FX conversion: both platforms let you hold and settle in multiple currencies, avoiding the forced conversion costs that aggregator platforms impose. If your revenue runs in euros or dollars, keeping a foreign currency balance and converting on your schedule is a real cost advantage.
Fee Verdict: Who Costs Less
Adyen’s IC++ model is transparent and comparable before you talk to sales. Checkout.com’s bespoke pricing requires a quote to model costs at all. If you are in early vendor selection, that difference matters for your business case.
At enterprise volumes with a complex card mix, the difference in effective rate is often small. We find the more relevant cost variable is integration overhead: Checkout.com’s faster implementation reduces the engineering cost of going live.
Adyen charges per transaction, with no setup or monthly fees. Checkout.com’s billing matrix creates a floor through a different mechanism.
Checkout.com vs Adyen Payment Methods and Checkout Options
Cards, Wallets and Alternative Payment Methods
Both platforms support over 150 currencies and upwards of 250 payment methods: Visa, Mastercard, Amex, Apple Pay, Google Pay, Alipay, WeChat Pay, Klarna, Clearpay, and account-to-account transfers including SEPA and Bacs.
Adyen’s payment method coverage is central to its unified commerce pitch: the same payment stack covers online checkout, in-store terminal, and mobile app payments. Checkout.com’s coverage is comparable for online channels, but its in-person capabilities depend on third-party integrations.
For your UK customers in European markets, both handle SEPA Direct Debit and European Economic Area (EEA) card acceptance. Both list Alipay and WeChat Pay, and on the Chinese wallets the documentation puts Adyen ahead rather than behind: Adyen takes both online, in-app and at the point of sale, while Checkout.com documents WeChat Pay for web only, and its AlipayCN page still marks the United Kingdom a Beta merchant region and settles in CNY, HKD or SGD rather than GBP. We read both sets of documentation on 24 September 2026, and it points the opposite way to the marketing.
Checkout Experience
Adyen’s Unified Commerce stack connects online and in-person payment data through a single platform. A retailer with both a Shopify store and physical locations can reconcile all revenue in one dashboard and offer click-and-collect without middleware.
Checkout.com is designed primarily for digital commerce. Its hosted payment page, payment links, and API are built for e-commerce and subscription flows where you control the checkout experience entirely in code.
Checkout.com sells on integration speed and Adyen doesn’t, and the difference shows in what each one asks of your developers: Adyen documents a large deployment as a five to six month project, where Checkout.com puts its hosted page and payment links in front of the API so you can take a payment before the full build. If your team needs to move quickly, that gap is the constraint that decides it.
Methods Verdict
Adyen wins on omnichannel coverage. If your business spans online and physical channels and you want a single provider for both, Adyen’s unified stack is a genuine operational advantage.
Checkout.com wins for pure digital commerce. If you’re building a cross-border platform and your payments are API-driven rather than hardware-driven, the integration speed is the argument in its favour, and the hosted page lets you take money before the build is finished.
Checkout.com vs Adyen Hardware, POS and In-Person Payments
Card Readers and Terminals
Adyen makes its own payment terminals: the S1E2 and S1F2 Android terminals. These run Adyen’s firmware and settle directly through its acquiring platform, removing a layer of third-party terminal dependency from your stack.
Checkout.com doesn’t manufacture hardware. If you need in-person acceptance, you build it through partner integrations rather than a dedicated terminal range. For a business where physical payment at the point of sale is a primary channel, that distinction matters.
Neither provider is right for small-volume in-person sales. If you need a face-to-face solution without enterprise overhead, SumUp Solo Lite at £15 upfront and 1.69% per transaction handles it without an enterprise contract.
POS Software and Hardware Add-ons
Adyen integrates with major retail POS systems including Lightspeed and enterprise platforms. Its terminal management system handles fleet-level updates and remote configuration across multiple locations, which reduces your IT overhead if you run a large estate.
Checkout.com’s POS story is largely API-driven: you build your own in-person flows using Checkout.com’s payment infrastructure, relying on third-party hardware and software. This suits merchants who want full control over the in-store experience.
For a UK chain retailer with 20 or more locations, Adyen’s owned hardware and unified back-end reporting simplifies reconciliation, risk management, and PCI compliance scope in ways that a partner-integration approach doesn’t replicate.
In-Person Verdict
On the shop floor there is no contest. Adyen makes the terminals, integrates with the POS systems and reports both channels in one place, so a merchant with real shop-floor volume buys one stack instead of assembling three.
If in-person is a secondary requirement and your team can integrate third-party terminals through the Checkout.com API, that is workable. If in-person is your primary channel, Adyen or a dedicated POS provider is the cleaner answer.
Checkout.com vs Adyen Online Payments and Integrations
Hosted Checkout, Payment Links and APIs
Checkout.com offers a hosted payment page, payment links, and a direct API. Its native 3DS2 integration and machine-learning fraud monitoring are embedded rather than add-on. If you want to reduce time to first live transaction, the hosted page and the payment links are the reason to look here: neither needs the full API build finished first.
Adyen’s API is well-documented, and the documentation isn’t the problem: the feature set is large enough that implementing it needs engineers you have assigned to nothing else. Adyen for Platforms is what you get for that effort. Reading both API references against each other, we put Adyen clearly ahead on this one thing: marketplace and split-payment logic for B2B SaaS and marketplaces, which Checkout.com has no equivalent of.
Both platforms support webhooks, tokenisation, and stored-card flows for subscription and recurring revenue. If your business runs subscription billing, either stack handles the technical requirements without custom middleware.
Platform Integrations
Adyen integrates natively with Salesforce Commerce Cloud, SAP, and major enterprise ERP systems. Its Adyen for Platforms product is purpose-built for marketplaces and SaaS companies that need to route payments between multiple sub-accounts.
Checkout.com connects with Shopify, WooCommerce, and Magento for e-commerce. Its ecosystem suits mid-market digital commerce, though it doesn’t match the enterprise ERP depth of Adyen. If your finance team runs on Salesforce and your payments need to talk to it directly, Adyen is the better fit.
Run a B2B marketplace that has to split one payment between several sellers and Adyen for Platforms is purpose-built for it. Sell direct to consumers and that machinery is overhead you carry without using, which is where Checkout.com’s lighter build pays off. We see the same split in how the two position their developer docs.
Online Verdict
Checkout.com wins for digital-first merchants who want API speed and a clean developer experience. If your team is building a cross-border payments product or a consumer fintech, the faster integration is the deciding factor on its own: nothing else here separates them for a pure API build.
Go the other way if the payments have to move between accounts. Platform integrations and fund-routing logic are what Adyen for Platforms exists for, the integration cost is higher, and for that job the infrastructure’s worth it.
Checkout.com vs Adyen Payouts, Contract Terms and Account Risk
Settlement Speed and Payout Schedule
Neither publishes a payout schedule. Both settle in multiple currencies as direct acquirers, so the timing is set in your contract rather than on a pricing page, and that’s the one number you can’t model before the sales call.
Checkout.com charges variable settlement fees on domestic and international payouts. The schedule depends on currency corridor and negotiated terms. Adyen’s settlement terms are agreed at the enterprise level during onboarding.
Ask for the settlement timeline on each currency you actually trade in, in writing. We count it as part of the price rather than the paperwork: a euro payout landing three days behind the GBP one moves your whole working-capital cycle, and neither provider will say which it is until you’re in the negotiation.
Contract Length and Exit Terms
Neither provider offers a rolling monthly contract. Both operate on enterprise commercial agreements negotiated directly. Exit terms, notice periods, and data portability provisions are part of the sales negotiation, not published.
That is a material difference from Stripe, Square, or SumUp. When you evaluate Checkout.com or Adyen, read the contract termination clauses carefully. We treat the data export clause as non-negotiable: understand how you get your data out before you sign.
Reserves, Holds and Account Stability
Adyen’s enterprise client base includes Uber, Spotify, H&M, and eBay. Account stability at that scale is well-evidenced. Merchant complaints on Trustpilot are primarily from end-consumers confused by seeing “Adyen” on bank statements, not merchants reporting service issues.
Checkout.com has faced more turbulence. After terminating its Binance contract in August 2023, UK processing volumes fell 13% and gross profit dropped 23%.
230 staff were laid off and the valuation fell from $40bn to $9.35bn, before a September 2025 staff share sale put it back at $12bn. Merchant reviews in the Trustpilot sample below cite abrupt service terminations dating from that period. On the numbers the company has stabilised, but $12bn is still well short of the 2022 peak, and that’s the figure to weigh against a multi-year contract.
Checkout.com vs Adyen Customer Reviews and Reputation
Trustpilot and Independent Review Themes
Adyen: 1.3/5 on Trustpilot across 442 reviews (September 2026). This score is driven almost entirely by end-consumers who see “Adyen” on their bank statement and don’t recognise the name. Merchant-level reviews of Adyen are not well-represented in the sample.
Checkout.com: 2.0/5 on Trustpilot across 101 reviews (September 2026). The same dynamic applies: consumer confusion inflates the negative count. Some merchant reviews do cite abrupt service terminations, likely reflecting the 2023 operational disruption.
Enterprise client references are the more reliable signal. Adyen counts Uber, Spotify, H&M, and eBay. Checkout.com counts Sony, Patreon, and Wise. Neither client list reflects a payment infrastructure that fails at scale.
Support Channels and Response Times
Both providers offer enterprise support with dedicated account managers for larger clients. The published support experience for smaller or newer merchants is less visible: if you are evaluating either platform, ask for references from merchants at your size.
Adyen’s documentation is thorough and its developer community is active. You can self-serve through most standard API queries; complex account or risk issues route through account management.
Checkout.com provides API documentation and a developer hub with a generally positive reputation among engineers for API-related queries. Operational or compliance-related support routes through account teams at the enterprise tier.
Reputation Verdict
We compared the two records over 2023 to 2026, and Adyen’s is the cleaner of them. The 1.3/5 Trustpilot score doesn’t reflect merchant experience; the enterprise client retention and platform uptime record does. That’s the signal we weight more heavily.
Checkout.com’s 2023-2024 turbulence is documented and worth factoring in. The recovery is real but partial, and we weigh it that way: $12bn in September 2025 against a $40bn peak in 2022 is the number a multi-year contract rides on.
Checkout.com vs Adyen for International Payments
Where each one reaches furthest abroad follows from what it built, not from its currency list.
The multi-currency balance both offer is a structural advantage over aggregator platforms, and it’s worth roughly what your FX spread costs you: convert on your own schedule and you keep the margin Stripe’s settlement cycle takes.
Adyen’s global bank network and SEPA coverage make it well-suited to omnichannel retailers with European physical locations. If you run stores in Germany and France, you settle in euros, reconcile centrally, and convert to GBP on a schedule that suits your finance team.
Checkout.com markets itself on APAC digital corridors, and its own licence register doesn’t support the marketing. Checkout.com names five Asia-Pacific entities: Singapore, Hong Kong, Australia, New Zealand and Japan. Adyen names six local acquiring markets in the region, the same five plus Malaysia. Neither acquires in mainland China at all, so every Chinese wallet payment a UK business takes is cross-border on either platform. If APAC is why you were leaning towards Checkout.com, that reason doesn’t survive reading the two licence pages.
Downsides of Checkout.com and Adyen
Downsides of Checkout.com
Checkout.com doesn’t publish its pricing. You can’t model costs without a sales conversation, which makes early-stage vendor comparison harder than with Adyen.
The 2023-2024 write-down is the part that outlasts the headlines. Losing one client cost Checkout.com 13% of its UK volume, which tells you how concentrated the book was, and a processor that concentrated can change its risk appetite faster than your contract can follow. That is the risk to price in, not the valuation itself.
Checkout.com has no owned hardware. For any merchant with physical sales channels, the in-person solution requires third-party integration rather than a platform-native answer.
Downsides of Adyen
Adyen charges per transaction, with no setup or monthly fees.
The five-to-six-month implementation is the barrier, and it’s the one downside here you can put a number on. Price six months of your own engineering time and compare it with the rate saving; on mid-market volumes the build often costs more than the processing ever gives back.
Adyen is built for enterprise. Its commercial terms, support model and product complexity assume a large organisation with its own payments and engineering teams. If you have neither, the overhead lands on whoever you do have, and that’s the cost mid-market merchants leave out of the business case.
Alternatives to Checkout.com and Adyen
Stripe is the natural step-down for UK merchants not yet at Adyen or Checkout.com volumes. Published rates (1.5% + 20p for UK consumer cards), no minimum billing, and a faster integration cycle make it the default choice for digital commerce businesses below £500k per month.
Airwallex suits UK businesses with significant international revenue. Multi-currency accounts, FX conversion at near-interbank rates, and no transaction fee on international payouts in many corridors address the cross-border cost problem without enterprise contract terms. We include it here because neither Adyen nor Checkout.com makes international payouts easy at lower volumes.
SumUp covers straightforward in-person and online acceptance without the overhead of either platform. At £15 upfront for a card reader and 1.69% per transaction with no contract, it handles small-to-mid in-person volume that neither Adyen nor Checkout.com is designed to serve.
Final Verdict: Checkout.com or Adyen?
Choose Adyen if you run an omnichannel business with physical retail locations, or if you are building a marketplace that needs Adyen for Platforms split-payment logic. The owned terminal range, unified commerce reporting, and enterprise ERP integrations are built for that use case.
Choose Checkout.com if your business is digital-first and you need to be taking payments sooner than a five-to-six-month Adyen build allows. The bespoke pricing and the absence of any hardware suit a leaner, code-driven stack. Don’t choose it for APAC reach: Adyen holds local acquiring in one more market in the region, and neither acquires in mainland China.
If you are below £50k per month in card revenue, the answer is neither. We recommend starting with Stripe, SumUp, or Square. Return to this comparison when your processing volumes make the minimum billing thresholds commercially irrelevant.
Frequently Asked Questions
Is Checkout.com or Adyen suitable for small UK businesses?
Neither is designed for small UK businesses. Adyen charges per transaction, with no setup or monthly fees, and Checkout.com quotes every plan on application. Both require enterprise commercial terms and a development team to implement.
For small businesses, Stripe, SumUp, or Square are the right alternatives. Stripe charges 1.5% + 20p for UK consumer cards with no minimums. SumUp and Square offer no-contract in-person and online acceptance from day one.
How do Checkout.com and Adyen fees compare?
Adyen publishes an IC++ structure: interchange plus 0.60% plus £0.11 per transaction. You can model this cost using published interchange tables before speaking to sales. Checkout.com doesn’t publish a rate card: it offers IC++ or a custom blended rate, both agreed during onboarding.
In practice, the effective rate difference at enterprise volumes is small. The more relevant cost variable is integration overhead. Checkout.com is generally faster to go live on, which reduces the engineering cost of reaching your first transaction.
Which is better for international payments: Checkout.com or Adyen?
Both let you hold foreign currency balances and settle without forced conversion. On Europe, Adyen has the bank network and the physical estate behind SEPA and EEA acceptance. On Asia-Pacific the marketing and the licence registers disagree: Checkout.com pitches APAC hardest, and Adyen holds local acquiring in six markets there against Checkout.com’s five.
For a UK business with primarily European revenue, either platform works. Selling into China, neither acquires locally, so Alipay and WeChat Pay are cross-border on both; Adyen documents them online, in-app and in person, and Checkout.com still marks UK merchants Beta on AlipayCN.
How do you get a rate from Checkout.com or Adyen?
Both require a sales conversation before offering pricing. Adyen’s IC++ structure means you can prepare a cost model using the published £0.11 fixed fee and 0.60% variable, but final terms are negotiated on your volume, card mix, and risk profile.
For Checkout.com, there is no public starting point. We recommend preparing a 12-month processing summary, your card mix breakdown by geography, and your chargeback rate before the first conversation. Those three data points drive the quote more than anything else.
Get competing quotes from both on the same day if you can. We find that parallel conversations produce better commercial outcomes than sequential ones.
How we reviewed this
We compiled this comparison by researching Checkout.com and Adyen on their primary UK websites, cross-referenced against Trustpilot review themes and FCA registration where applicable. Transaction rates and features verified 15 September 2026.
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