Lego APIs?

So the company I work for has become really good at making scalable APIs for clients in a relatively short period. Some of these APIs operate in the payment space which brings with it its own complexity and requirements and we've been able to deliver flawlessly given our internal processes.

We're wondering if there's an opportunity to build out a suite of APIs and offer it as a SAAS. Imagine we give you a Product API, Orders API and Payment API - then you can build a custom ecommerce solution. Or you can take the Product API, Booking API and Customer API to build the next AirBNB. Think of the APIs as legos almost that easily connects to each other and you build on top of that. Build MVPs to market-ready products in a fraction of the time.

Would you (as a dev) be interested? What APIs would you like to see and use to get started? Or are you happy with what is already available out there now?