openapi: 3.0.0
info:
  version: 2.0.0
  title: HMDA Data Browser API
  description: Provides access to Home Mortgage Disclosure Act (HMDA) data, enabling aggregation reports and CSV downloads of mortgage lending records filtered by geography, financial institution LEI, and year.
  contact:
    name: FFIEC HMDA Help
    url: https://ffiec.cfpb.gov/
  license:
    name: Creative Commons CC0
    url: https://creativecommons.org/publicdomain/zero/1.0/
servers:
  - url: 'https://ffiec.cfpb.gov/v2/data-browser-api'
    description: Production server
tags:
  - name: Aggregations
    description: Aggregated HMDA data reports
  - name: CSV
    description: HMDA data as CSV downloads
  - name: Filers
    description: HMDA filing institution information
paths:
  /view/nationwide/aggregations:
    get:
      tags:
        - Aggregations
      summary: Nationwide aggregation report
      description: Returns an aggregated HMDA data report for the entire nation filtered by the specified variables.
      parameters:
        - $ref: '#/components/parameters/years'
        - $ref: '#/components/parameters/variables'
        - $ref: '#/components/parameters/actions_taken'
        - $ref: '#/components/parameters/construction_methods'
        - $ref: '#/components/parameters/derived_dwelling_categories'
        - $ref: '#/components/parameters/derived_loan_product_types'
        - $ref: '#/components/parameters/ethnicities'
        - $ref: '#/components/parameters/lien_statuses'
        - $ref: '#/components/parameters/loan_purposes'
        - $ref: '#/components/parameters/loan_types'
        - $ref: '#/components/parameters/races'
        - $ref: '#/components/parameters/sexes'
      responses:
        '200':
          description: Successful aggregation response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AggregationResult'
        '400':
          description: Bad request - invalid parameters
  /view/aggregations:
    get:
      tags:
        - Aggregations
      summary: Aggregation report by geography or LEI
      description: Returns an aggregated HMDA data report filtered by state, county, MSA/MD, or LEI and the specified variables.
      parameters:
        - $ref: '#/components/parameters/years'
        - $ref: '#/components/parameters/variables'
        - $ref: '#/components/parameters/states'
        - $ref: '#/components/parameters/counties'
        - $ref: '#/components/parameters/msamds'
        - $ref: '#/components/parameters/leis'
        - $ref: '#/components/parameters/actions_taken'
        - $ref: '#/components/parameters/construction_methods'
        - $ref: '#/components/parameters/derived_dwelling_categories'
        - $ref: '#/components/parameters/derived_loan_product_types'
        - $ref: '#/components/parameters/ethnicities'
        - $ref: '#/components/parameters/lien_statuses'
        - $ref: '#/components/parameters/loan_purposes'
        - $ref: '#/components/parameters/loan_types'
        - $ref: '#/components/parameters/races'
        - $ref: '#/components/parameters/sexes'
      responses:
        '200':
          description: Successful aggregation response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AggregationResult'
        '400':
          description: Bad request - invalid parameters
  /view/nationwide/csv:
    get:
      tags:
        - CSV
      summary: Nationwide data subset as CSV
      description: Returns a CSV download of HMDA data for the entire nation filtered by the specified variables.
      parameters:
        - $ref: '#/components/parameters/years'
        - $ref: '#/components/parameters/actions_taken'
        - $ref: '#/components/parameters/construction_methods'
        - $ref: '#/components/parameters/derived_dwelling_categories'
        - $ref: '#/components/parameters/derived_loan_product_types'
        - $ref: '#/components/parameters/ethnicities'
        - $ref: '#/components/parameters/lien_statuses'
        - $ref: '#/components/parameters/loan_purposes'
        - $ref: '#/components/parameters/loan_types'
        - $ref: '#/components/parameters/races'
        - $ref: '#/components/parameters/sexes'
      responses:
        '200':
          description: CSV data response
          content:
            text/csv:
              schema:
                type: string
                format: binary
        '400':
          description: Bad request - invalid parameters
  /view/csv:
    get:
      tags:
        - CSV
      summary: Data subset as CSV by geography or LEI
      description: Returns a CSV download of HMDA data filtered by state, county, MSA/MD, or LEI and the specified variables.
      parameters:
        - $ref: '#/components/parameters/years'
        - $ref: '#/components/parameters/states'
        - $ref: '#/components/parameters/counties'
        - $ref: '#/components/parameters/msamds'
        - $ref: '#/components/parameters/leis'
        - $ref: '#/components/parameters/actions_taken'
        - $ref: '#/components/parameters/construction_methods'
        - $ref: '#/components/parameters/derived_dwelling_categories'
        - $ref: '#/components/parameters/derived_loan_product_types'
        - $ref: '#/components/parameters/ethnicities'
        - $ref: '#/components/parameters/lien_statuses'
        - $ref: '#/components/parameters/loan_purposes'
        - $ref: '#/components/parameters/loan_types'
        - $ref: '#/components/parameters/races'
        - $ref: '#/components/parameters/sexes'
      responses:
        '200':
          description: CSV data response
          content:
            text/csv:
              schema:
                type: string
                format: binary
        '400':
          description: Bad request - invalid parameters
  /view/filers:
    get:
      tags:
        - Filers
      summary: List HMDA filers
      description: Returns a list of financial institutions that filed HMDA data for the specified year(s) and geography or LEI filters.
      parameters:
        - $ref: '#/components/parameters/years'
        - $ref: '#/components/parameters/states'
        - $ref: '#/components/parameters/counties'
        - $ref: '#/components/parameters/msamds'
        - $ref: '#/components/parameters/leis'
      responses:
        '200':
          description: List of HMDA filers
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FilersResult'
        '400':
          description: Bad request - invalid parameters
security: []
components:
  parameters:
    years:
      name: years
      in: query
      required: true
      description: Comma-separated list of years (e.g. 2018,2019,2020)
      schema:
        type: string
        example: '2020'
    variables:
      name: variables
      in: query
      description: Comma-separated list of variables to aggregate by (e.g. action_taken,loan_type)
      schema:
        type: string
    states:
      name: states
      in: query
      description: Comma-separated list of two-letter state abbreviations (e.g. CA,TX)
      schema:
        type: string
    counties:
      name: counties
      in: query
      description: Comma-separated list of 5-digit FIPS county codes
      schema:
        type: string
    msamds:
      name: msamds
      in: query
      description: Comma-separated list of 5-digit MSA/MD codes
      schema:
        type: string
    leis:
      name: leis
      in: query
      description: Comma-separated list of Legal Entity Identifiers (LEI) for financial institutions
      schema:
        type: string
    actions_taken:
      name: actions_taken
      in: query
      description: Comma-separated list of action taken codes (1-8)
      schema:
        type: string
    construction_methods:
      name: construction_methods
      in: query
      description: Comma-separated list of construction method codes (1=Site Built, 2=Manufactured)
      schema:
        type: string
    derived_dwelling_categories:
      name: derived_dwelling_categories
      in: query
      description: Comma-separated list of derived dwelling category codes
      schema:
        type: string
    derived_loan_product_types:
      name: derived_loan_product_types
      in: query
      description: Comma-separated list of derived loan product type codes
      schema:
        type: string
    ethnicities:
      name: ethnicities
      in: query
      description: Comma-separated list of ethnicity codes
      schema:
        type: string
    lien_statuses:
      name: lien_statuses
      in: query
      description: Comma-separated list of lien status codes (1=First lien, 2=Subordinate lien)
      schema:
        type: string
    loan_purposes:
      name: loan_purposes
      in: query
      description: Comma-separated list of loan purpose codes (1=Home purchase, 2=Home improvement, 31=Refinancing, 32=Cash-out refinancing, 4=Other purpose, 5=Not applicable)
      schema:
        type: string
    loan_types:
      name: loan_types
      in: query
      description: Comma-separated list of loan type codes (1=Conventional, 2=FHA, 3=VA, 4=FSA/RHS)
      schema:
        type: string
    races:
      name: races
      in: query
      description: Comma-separated list of race codes
      schema:
        type: string
    sexes:
      name: sexes
      in: query
      description: Comma-separated list of sex codes (1=Male, 2=Female, 3=Information not provided, 4=Not applicable)
      schema:
        type: string
  schemas:
    AggregationResult:
      type: object
      properties:
        aggregations:
          type: array
          items:
            type: object
            additionalProperties: true
        parameters:
          type: object
          description: The parameters used for the aggregation query
          additionalProperties: true
    FilersResult:
      type: object
      properties:
        institutions:
          type: array
          items:
            $ref: '#/components/schemas/Institution'
    Institution:
      type: object
      properties:
        lei:
          type: string
          description: Legal Entity Identifier
        name:
          type: string
          description: Institution name
        period:
          type: string
          description: Filing period year