SumUp is a London-founded fintech serving millions of small businesses with mobile card readers, Solo terminals, online checkout, payment links and a free online store. Flat per-transaction pricing with no long-term contract makes it a go-to for micro-merchants, market stalls, pop-ups and service businesses across 30+ countries.
Pricing
Flat per-transaction rates (e.g. 1.75% in-person in the UK, 2.75% in the US); varies by country. No setup fee.
Best for
Stripe
Developer-first payments for internet businesses
2.9% + 30¢
Square
Simple all-in-one for retail, restaurants and services
2.6% + 10¢
Helcim
Transparent interchange-plus pricing that scales down
0.40% + 25¢ over interchange