We're having trouble finding the Rest API documentation for Zoho forms - is there an active API?

We have a specific task we're trying to accomplish.  There's a "Zoho CRM" widget in there, but we don't want end-users of the form to look up entries from our CRM.  We're putting the form in a logged in site where we have definitive access to the users information (in particular email).  We want to pass that email into the Zoho CRM widget, whether it's via the API, Deluge or some other javascript mechanism that's safe.