openapi: 3.0.3
info:
  title: USAspending Agency References API
  description: The USAspending API provides free, public, unauthenticated access to U.S. federal spending data - contracts, grants, loans, direct payments, and other financial assistance awards, plus agency budgets, federal account (Treasury Account Symbol) data, recipient profiles, and disaster/emergency (including COVID-19) relief spending. USAspending.gov is operated by the Treasury Department's Bureau of the Fiscal Service to implement the DATA Act's federal spending transparency mandate. Most search and listing endpoints accept a POST with a JSON body describing filters, fields, sort, and pagination, because filter combinations are too complex for query strings; simpler single-resource lookups use GET with path parameters. This document is a representative, hand-authored subset of the full API grounded directly in the official API Blueprint contracts published in the usaspending-api GitHub repository - it is not a complete mirror of every endpoint and field.
  version: v2
  contact:
    name: USAspending.gov / Bureau of the Fiscal Service
    url: https://www.usaspending.gov
  license:
    name: Open source (CC0 / public domain, U.S. Government work)
    url: https://github.com/fedspendingtransparency/usaspending-api/blob/master/LICENSE.md
servers:
- url: https://api.usaspending.gov/api/v2
  description: Production (no authentication required)
tags:
- name: References
  description: Reference and typeahead/autocomplete lookup data.
paths:
  /references/toptier_agencies/:
    get:
      operationId: listToptierAgencies
      tags:
      - References
      summary: List toptier agencies
      description: Returns all toptier agencies with their budgetary resources and the percentage of total government budget authority each accounts for. Powers the USAspending.gov agency profile pages.
      parameters:
      - name: sort
        in: query
        required: false
        description: Field to sort results by.
        schema:
          type: string
          default: percentage_of_total_budget_authority
      - name: order
        in: query
        required: false
        description: Sort direction.
        schema:
          type: string
          enum:
          - asc
          - desc
          default: desc
      responses:
        '200':
          description: List of toptier agencies.
          content:
            application/json:
              schema:
                type: object
                properties:
                  results:
                    type: array
                    items:
                      $ref: '#/components/schemas/ToptierAgency'
  /autocomplete/awarding_agency_office/:
    post:
      operationId: autocompleteAwardingAgencyOffice
      tags:
      - References
      summary: Autocomplete awarding agency / office
      description: Returns awarding agencies and sub-agency offices matching the specified search text. Used by the Advanced Search page's Awarding Agency filter.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - search_text
              properties:
                search_text:
                  type: string
                limit:
                  type: integer
            example:
              search_text: Defense
      responses:
        '200':
          description: Matching awarding agencies / offices.
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
  /autocomplete/recipient/:
    post:
      operationId: autocompleteRecipient
      tags:
      - References
      summary: Autocomplete recipient
      description: Returns recipients matching the specified search text, for use as a search filter.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - search_text
              properties:
                search_text:
                  type: string
                limit:
                  type: integer
      responses:
        '200':
          description: Matching recipients.
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
components:
  schemas:
    ToptierAgency:
      type: object
      properties:
        abbreviation:
          type: string
        agency_id:
          type: integer
        agency_name:
          type: string
        budget_authority_amount:
          type: number
        current_total_budget_authority_amount:
          type: number
        obligated_amount:
          type: number
        outlay_amount:
          type: number
        percentage_of_total_budget_authority:
          type: number
        toptier_code:
          type: string
        agency_slug:
          type: string