Our data is delivered in a variety of ways.
Although we don't currently have public APIs, they are something we have thought about. Typically our data is delivered by data dumps in the form of a CSV or JSON that gives the ultimate flexibility for the user.
Our most heavily used internal API accesses our nonprofit data, but through the lens of Donor Advised Fund eligibility. This data is used in Giving Compass' Giving Planner to help link donors to nonprofits in their DAF accounts.
If you would like data by API or have a great idea for how we can help you through an API, please let us know!