CharityAPI.org

CharityAPI.org is a charity and nonprofit data API that offers low-cost access to the data the IRS collects from charities each year. It's the API the IRS should have built, offering simple integrations into your app or CRM so that you can quickly confirm a nonprofit's charitable status.

CharityAPI.org offers the ability to search all US nonprofits, lookup each nonprofit's details using EIN, and quickly confirm that donations to a charity are tax deductible. The API is great for offering a free tier of your SaaS to charities, or for listing charities that your users could donate to. If you're building an app that relies on accurate, up-to-date nonprofit data, CharityAPI.org has what you need.

Docs can be found at https://docs.charityapi.org.