If you sell anything to nonprofits — software, fundraising services, consulting — you have one segmentation question that matters more than all others: can this organization afford me? Unusually, the answer is public. Every US nonprofit above a minimal size files a Form 990 with the IRS, and the filings carry total revenue, expenses, and assets.
The friendly way in is ProPublica's Nonprofit Explorer API. No key, no registration.
Search, then enrich
GET https://projects.propublica.org/nonprofits/api/v2/search.json
?q=food+bank&state[id]=TX&ntee[id]=5
