SumUp

SumUp is a European fintech company that has democratized card payment acceptance for small businesses and micro-merchants across Europe and beyond. Founded in 2012 by Daniel Klein and Marc-Alexander Christ, SumUp started with a simple premise: every business, no matter how small, should be able to accept card payments without the complexity, contracts, and high fees that traditional payment processors imposed. Headquartered in London with major operations in Berlin, Sofia, and Sao Paulo, SumUp has grown to serve over 4 million merchants in more than 35 countries, processing billions of euros in transactions annually.

The company occupies a critical niche in the European payments landscape. While enterprise payment processors like Adyen and Worldline serve large corporations, and buy-now-pay-later providers like Klarna focus on consumer financing, SumUp targets the long tail of small businesses: market stall vendors, food trucks, hairdressers, plumbers, yoga instructors, and small retail shops. These businesses traditionally had limited options for accepting card payments, often relying on cash or facing prohibitive setup costs from legacy payment providers. SumUp eliminated these barriers with affordable card readers, simple flat-rate pricing, and no monthly fees or long-term contracts.

Card Readers and Hardware

SumUp's product line includes several card reader models designed for different business scenarios. The SumUp Air is the company's flagship mobile card reader, connecting to a smartphone via Bluetooth and supporting contactless (NFC), chip, and magnetic stripe payments. Priced at approximately 39 euros as a one-time purchase, the Air reader is one of the most affordable entry points into card payment acceptance on the market. The SumUp Solo is a standalone terminal with a built-in touchscreen and optional printer cradle, operating independently of a smartphone via built-in mobile connectivity.

The SumUp Solo Lite provides a mid-range option with a touchscreen for standalone operation at a lower price point than the full Solo. All SumUp card readers accept Visa, Mastercard, American Express, and other major card networks, as well as mobile wallet payments including Apple Pay, Google Pay, and Samsung Pay. The hardware is designed to be durable and portable, with battery life sufficient for a full day of transactions. For businesses that need receipt printing, SumUp offers the Solo Printer cradle that connects directly to the Solo terminal.

Point of Sale (POS) System

Beyond basic card acceptance, SumUp offers a full point-of-sale system through the SumUp POS app and dedicated POS hardware. The POS system includes inventory management, employee management, table planning for restaurants, and detailed sales analytics. Businesses can create product catalogs with categories, variants, and modifiers (useful for restaurants with customizable menu items), set up multiple tax rates, and track inventory levels with low-stock alerts.

The SumUp POS Lite runs on the SumUp app on any iOS or Android device, providing a free point-of-sale solution that pairs with SumUp's card readers. For more established businesses, SumUp offers dedicated POS hardware bundles including tablet stands, receipt printers, and cash drawers. The POS system integrates directly with SumUp's payment processing, eliminating the need for separate payment gateway configuration. This integrated approach simplifies the technology stack for small businesses that would otherwise need to coordinate between separate POS, payment, and inventory systems.

Online Payments and E-Commerce

SumUp has expanded well beyond in-person payments to offer online payment solutions. SumUp Online Store allows businesses to create a simple e-commerce website with product listings, payment processing, and order management included. Payment Links enable businesses to send payment requests via email, SMS, or messaging apps -- useful for service businesses that invoice after completing work. The SumUp Online Checkout integrates with existing websites to add payment processing capabilities.

For businesses that need more sophisticated e-commerce functionality, SumUp integrates with platforms like WooCommerce and provides API access for custom payment integrations. QR code payments allow businesses to generate QR codes that customers scan to pay, useful for table service in restaurants or donation collection. Gift cards, both physical and digital, can be created and managed through the SumUp ecosystem. These online capabilities transform SumUp from a simple card reader provider into a more comprehensive commerce platform for small businesses.

Invoicing and Business Tools

SumUp's invoicing feature allows businesses to create and send professional invoices directly from the SumUp app. Invoices include a payment link that customers can use to pay online with their card, reducing the friction of invoice collection and shortening payment cycles. Businesses can customize invoices with their logo, set due dates, and track payment status. Recurring invoices can be automated for subscription-based services.

The SumUp Business Account provides merchants with a dedicated account for receiving their card payment settlements. Next-business-day settlements ensure that funds from card transactions are available quickly, a significant improvement over the multi-day settlement periods common with traditional payment processors. The business account includes a free Mastercard debit card for spending, and SumUp offers sub-accounts for organizing finances. While not a full replacement for a traditional business bank account, the SumUp Business Account simplifies cash flow management for small businesses.

Pricing and Fee Structure

SumUp's pricing model is one of its most compelling features for small businesses. The company charges a flat transaction fee of 1.69% for in-person card payments across Europe, with no monthly fees, no minimum volumes, and no long-term contracts. This transparent pricing eliminates the complexity of interchange-plus pricing models, tiered rates, and hidden fees that small businesses often encounter with traditional payment processors. You buy the card reader once and pay only when you process a transaction.

Online payment transactions are charged at slightly higher rates, typically around 2.5% plus a small fixed fee per transaction. Invoiced payments follow similar online rates. When compared to Square's pricing in markets where it operates, SumUp's rates are competitive and often lower. For very small businesses processing fewer than a few thousand euros per month, the no-monthly-fee model is particularly advantageous. However, high-volume merchants may find that percentage-based pricing becomes expensive compared to processors that offer lower per-transaction rates in exchange for monthly fees.

European Data Protection and Compliance

As a company with its primary European operations in London and Berlin, SumUp operates under both UK and EU data protection regulations, including GDPR. Payment data processing is handled in compliance with PCI DSS (Payment Card Industry Data Security Standard), the global security standard for card payment processing. SumUp is registered as an authorized payment institution with the Financial Conduct Authority (FCA) in the UK and regulated by the corresponding authorities in each European country where it operates.

For European businesses processing customer card payments, using a European payment provider reduces the regulatory complexity of cross-border data transfers. Payment transaction data processed by SumUp remains within European regulatory frameworks, unlike US-based processors like Square where data may be subject to US legal jurisdiction. This European data processing approach simplifies GDPR compliance for merchants, as their payment processor's data handling practices align with the same regulatory framework that governs their own business.

SumUp for Different Business Types

SumUp has tailored its offerings for specific business verticals. Restaurants benefit from table management, menu customization with modifiers, and tip management features in the POS system. Retail businesses can use inventory tracking, barcode scanning, and product variant management. Service businesses like hairdressers, personal trainers, and consultants benefit from invoicing, payment links, and appointment-based payment collection. Market vendors and food trucks use the portable card readers with mobile data connectivity for payment acceptance anywhere.

The company has also expanded into financial services for small businesses with its SumUp Business Account and lending products. Eligible merchants can access business loans based on their SumUp transaction history, with repayments deducted automatically from future card sales. This embedded finance approach leverages SumUp's transaction data to offer credit to small businesses that might struggle to access traditional bank lending, creating a more complete financial ecosystem for micro-merchants.

Limitations and Considerations

SumUp's flat percentage fee model, while simple, can become expensive for businesses processing high volumes. A business processing 50,000 euros per month at 1.69% pays 845 euros in fees, whereas a traditional processor might offer rates of 1.0-1.2% for that volume. For businesses exceeding roughly 10,000 euros per month in card transactions, it is worth comparing SumUp's total cost against processors that offer volume-based pricing. SumUp does not currently offer volume discounts or negotiated rates for larger merchants.

The platform's functionality, while comprehensive for small businesses, lacks some features that growing businesses may need. Multi-location management, advanced employee permissions, detailed inventory analytics, and sophisticated reporting are more limited than dedicated POS systems from providers like Lightspeed or Shopify POS. Businesses that outgrow SumUp's capabilities may need to migrate to a more feature-rich platform, which can involve significant setup effort. Customer support, while generally responsive, is primarily email and chat-based, with limited phone support availability.

Who Should Choose SumUp

SumUp is ideal for small businesses, sole traders, and micro-merchants who want to accept card payments without the complexity and cost of traditional payment processing agreements. Businesses that value transparent pricing with no monthly fees will appreciate SumUp's flat-rate model. European merchants who want their payment data processed within European regulatory frameworks benefit from SumUp's regional data handling practices. Mobile and pop-up businesses like food trucks, market stalls, and event vendors will find the portable hardware and mobile connectivity particularly useful. If you are a small business owner looking for a straightforward, affordable way to start accepting card payments in 2026, SumUp remains one of the most accessible European options available.