CharityAPI

CharityAPI Organizations API

Look up US nonprofit organization records by EIN

Documentation GitHub OpenAPI

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/charityapi-organizations-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.1.0
info:
  title: Charity Autocomplete Organizations API
  description: REST API providing access to US nonprofit and charity data sourced from IRS filings. Supports lookup of organizations by EIN, public charity (501c3) verification checks, and name-based autocomplete for donation, fundraising, and compliance workflows.
  version: '1.0'
  contact:
    name: CharityAPI Support
    url: https://www.charityapi.org/contact
  termsOfService: https://www.charityapi.org/terms
servers:
- url: https://api.charityapi.org/api
  description: CharityAPI Production
security:
- apiKeyAuth: []
tags:
- name: Organizations
  description: Look up US nonprofit organization records by EIN
paths:
  /organizations/{ein}:
    get:
      operationId: getOrganizationByEin
      summary: Get organization by EIN
      description: Retrieve a single nonprofit organization record from the IRS Business Master File by Employer Identification Number. Returns charities, political organizations, insurance organizations, and other nonprofits.
      tags:
      - Organizations
      parameters:
      - name: ein
        in: path
        required: true
        description: Employer Identification Number for the organization.
        schema:
          type: string
          pattern: ^[0-9]{9}$
      responses:
        '200':
          description: Organization record
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Organization'
        '404':
          description: Organization not found
        '401':
          description: Missing or invalid API key
        '429':
          description: Rate limit exceeded
components:
  schemas:
    Organization:
      type: object
      description: A nonprofit organization record sourced from the IRS Business Master File.
      properties:
        ein:
          type: string
          description: Employer Identification Number.
        name:
          type: string
          description: Legal organization name.
        ico:
          type: string
          description: In Care Of name.
        street:
          type: string
        city:
          type: string
        state:
          type: string
        zip:
          type: string
        group:
          type: string
        subsection:
          type: string
        affiliation:
          type: string
        classification:
          type: string
        ruling:
          type: string
        deductibility:
          type: string
        foundation:
          type: string
        activity:
          type: string
        organization:
          type: string
        status:
          type: string
        tax_period:
          type: string
        asset_cd:
          type: string
        income_cd:
          type: string
        filing_req_cd:
          type: string
        pf_filing_req_cd:
          type: string
        acct_pd:
          type: string
        asset_amt:
          type: integer
        income_amt:
          type: integer
        revenue_amt:
          type: integer
        ntee_cd:
          type: string
          description: National Taxonomy of Exempt Entities code.
        sort_name:
          type: string
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: apikey
      description: API key issued by CharityAPI, sent in the apikey request header.
externalDocs:
  description: CharityAPI Documentation
  url: https://docs.charityapi.org/