Wealthfront - Automated, low cost investment service

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

Acorns - Automated portfolio management monitoring your investments

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

Ark7 - Choose a property and invest in shares

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.