openapi: 3.1.0
info:
  title: Charity Autocomplete Public Charity Check 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: Public Charity Check
  description: Verify whether an EIN is a tax-deductible public charity
paths:
  /public_charity_check/{ein}:
    get:
      operationId: publicCharityCheck
      summary: Check public charity status
      description: Returns a boolean indicating whether the supplied EIN belongs to an IRS public charity, and therefore qualifies as a 501c3 with tax-deductible donation status.
      tags:
      - Public Charity Check
      parameters:
      - name: ein
        in: path
        required: true
        description: Employer Identification Number to verify.
        schema:
          type: string
          pattern: ^[0-9]{9}$
      responses:
        '200':
          description: Public charity check result
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PublicCharityCheck'
        '401':
          description: Missing or invalid API key
        '429':
          description: Rate limit exceeded
components:
  schemas:
    PublicCharityCheck:
      type: object
      description: Result of a 501c3 public charity verification.
      properties:
        ein:
          type: string
        public_charity:
          type: boolean
          description: True when the EIN is registered as an IRS public charity.
  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/