TrueLayer - Simple Bank APIs to access real-time financial data

Denarii API - Single remittance payments API that integrates with over 20 other APIs.

Plaid - Infrastructure that powers financial technology by enabling applications to connect with users' bank accounts.

Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.

Tilisy API - Free access to European bank accounts for developers

Teller API - A single API to connect your app with any bank's account