Revolut

Revolut's Business API is comprehensive and modern, offering excellent banking automation capabilities. It uses OAuth2 and certificate-based authentication with JWT tokens, providing strong security.

The API covers accounts, payments, cards, counterparties, and currency exchange extensively. OpenAPI specifications are available on GitHub, with Postman collections for easy testing. Access tokens expire after 40 minutes with robust refresh mechanisms. However, it requires a Grow plan or higher and certificate management can be complex initially.

It is ideal for businesses needing banking automation, particularly strong for international payments and multi-currency operations. Developer experience is excellent with comprehensive documentation and regular updates.