The School Search API was originally an experimental effort. This document is just to provide a quick reference in the absence of more thorough documentation.
The School Search end point is https://data.guidestar.org/v1/schoolsearch .
Using Lucene Query Syntax, criteria are provided using the q parameter. Each of the returned fields are searchable. Below is a sample call using the school name:
More complex queries can be constructed to meet most needs
Authentication is handled via API key (passed in as the User using Basic Authentication) as with the other Gen I REST APIs.
I hope this is helpful.