Reviewers see Mercury as strong on setup, interface, and startup-friendly tools: users repeatedly call it easy to onboard, simple to navigate, and useful for features like virtual cards, integrations, and payments. Founders of
CatDoes and
Slashspace AI also praise its API and accessibility for foreign founders. But the main criticism is serious: several users report slow, email-only support, low card limits, sudden compliance reviews or account closures, delayed funds, and poor communication when problems happen.