Using nopcomerce with Stored Procedures / API to connect to an external data store for content

We are a developer of .NET Library Management Systems. We seek to integrate our system with eCommerce systems in the near future. Many of our clients have our database which has an API so that external applications can call our Content. We would ideally like to use the API with nopCommerce to pass data through to the eCommerce app.

I am told that nop Commerce only supports Stored Procedure calls and will not allow the use of an API to make calls into another database. Our API is a RESTful API. We do not like the idea of using Stored Procedures and would prefer to use the API.

Would nopCommerce be suitable for our purposes.  

Thank you