Excel REST API in SharePoint Online

Excel Services on SharePoint offers a bunch of ways for developers to extend the power of Excel and integrate Excel workbooks into larger solutions. Originally, to take advantage of this, you needed to deploy and maintain your own SharePoint servers. The world has changed, though: With Office365 for business, you can access the power of Excel Services on SharePoint through the cloud. Here's an example to help you get started using the Excel Services REST API in the cloud.