US 501(c) nonprofit organization search
US 501(c) nonprofit organization search. Lookup by 9-digit EIN (with or without hyphen), free-text name, 2-letter state, NTEE category code (e.g. 'B99' for education), or IRS subsection code (3 = 501(c)(3), 4 = 501(c)(4), etc.). Each record includes EIN, name, city/state, NTEE code, subsection code + human-readable subsection description (e.g. '501(c)(3) Charitable / Religious / Educational'), and relevance score. Sourced from ProPublica Nonprofit Explorer, which aggregates IRS Form 990 + BMF data; underlying IRS data is public domain.
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://2s.io/api/nonprofit/search
| Category | Code and developer |
|---|---|
| Provider host | 2s.io |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.003 | 236 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"q": "Khan Academy"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"properties": {
"method": {
"const": "GET"
},
"queryParams": {
"properties": {
"ein": {
"description": "9-digit EIN, with or without hyphen.",
"type": "string"
},
"nteeCode": {
"description": "NTEE category (e.g., \"B99\").",
"type": "string"
},
"page": {
"default": 0,
"description": "0-indexed page (100/page).",
"minimum": 0,
"type": "integer"
},
"q": {
"description": "Free-text name search.",
"type": "string"
},
"state": {
"description": "2-letter US state.",
"type": "string"
},
"subsectionCode": {
"description": "IRS subsection (3 = 501(c)(3), etc.).",
"type": "integer"
}
}
},
"type": {
"const": "http"
}
},
"required": [
"type",
"method",
"queryParams"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}