The 501see journal
Ideas for better nonprofit research.
Practical guides to nonprofit data, grant research, and the tools that help good work move forward.
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21 articles
Which Sectors See Repeat Foundation Grants Most Often?
A two-year follow-up of IRS foundation filings finds similar repeat-grant rates across nonprofit sectors, with Environment, Education, and Arts near the top.
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Do Private Foundation Grants Increase When They Repeat?
A look at 1.63 million consecutive-year 990-PF comparisons shows how reported grant totals changed for the same foundation-recipient pairs, by prior-year amount.
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Free Nonprofit Verification APIs
Compare nonprofit lookup and verification APIs, then start building for free with 501see name search, EIN lookup, and latest filing data.
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Candid and Cause IQ API Alternatives for Developers
Candid and Cause IQ are expensive, sales-assisted data products. 501see is the self-serve nonprofit API built for developers.
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Nonprofit Data Webhooks: Which 990 APIs Support Them?
A current look at whether nonprofit data providers document webhook support for 990 changes, including IRS, Candid, Cause IQ, ProPublica, and 501see.
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Nonprofit Data Export API: How to Download IRS 990 Data at Scale
Compare nonprofit data export options for developers, including filtered CSV exports, API access, pricing models, and alternatives to building an IRS ingestion pipeline.
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