openapi: 3.0.1
info:
  title: US Senate Lobbying Disclosure Act (LDA) API
  description: >-
    The Senate Lobbying Disclosure Act (LDA) REST API provides public access to
    lobbying filings, registrations, quarterly activity reports (LD-2), and
    semi-annual contribution reports (LD-203). An optional API key increases the
    rate limit from 15 to 120 requests per minute.
  version: "1.0"
  contact:
    name: Senate Office of Public Records
    email: lobby@sec.senate.gov
    url: https://lda.senate.gov/api/
servers:
  - url: https://lda.senate.gov/api/v1
security:
  - ApiKeyAuth: []
  - {}
tags:
  - name: Filings
    description: Lobbying disclosure filings (LD-1, LD-2, LD-203)
  - name: Registrants
    description: Lobbying firm and self-employed lobbyist registrations
  - name: Clients
    description: Clients on whose behalf lobbying is conducted
  - name: Lobbyists
    description: Individual lobbyist records
  - name: Contributions
    description: Semi-annual campaign contribution reports (LD-203)
  - name: Constants
    description: Reference data — filing types, issue codes, government entities, etc.
paths:
  /filings/:
    get:
      tags:
        - Filings
      operationId: listFilings
      summary: List Lobbying Disclosure Filings
      description: >-
        Returns a paginated list of lobbying disclosure filings. Supports
        filtering by filing type, year, period, registrant, and client.
      parameters:
        - name: filing_type
          in: query
          description: >-
            Filing type code (e.g., LD1=Registration, LD2=Quarterly Report,
            MM=Mid-Year Report)
          schema:
            type: string
        - name: filing_year
          in: query
          description: Year of the filing
          schema:
            type: integer
        - name: filing_period
          in: query
          description: Filing period (e.g., first_quarter, second_quarter, mid_year, year_end)
          schema:
            type: string
        - name: registrant_id
          in: query
          description: Filter by registrant ID
          schema:
            type: integer
        - name: client_id
          in: query
          description: Filter by client ID
          schema:
            type: integer
        - name: registrant_name
          in: query
          description: Filter by registrant name (partial match)
          schema:
            type: string
        - name: client_name
          in: query
          description: Filter by client name (partial match)
          schema:
            type: string
        - name: lobbyist_name
          in: query
          description: Filter by lobbyist name
          schema:
            type: string
        - name: issue_code
          in: query
          description: Filter by lobbying issue code (e.g., TAX, HCR, DEF)
          schema:
            type: string
        - name: dt_posted
          in: query
          description: Filter by date posted (ISO 8601 date)
          schema:
            type: string
            format: date
        - name: page
          in: query
          description: Page number for pagination
          schema:
            type: integer
            default: 1
        - name: limit
          in: query
          description: Number of results per page (default 25, max 25)
          schema:
            type: integer
            default: 25
        - name: format
          in: query
          description: Response format
          schema:
            type: string
            enum: [json, xml]
            default: json
      responses:
        '200':
          description: Paginated list of filings
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FilingListResponse'
        '401':
          description: Unauthorized
        '429':
          description: Rate limit exceeded
  /filings/{filing_uuid}/:
    get:
      tags:
        - Filings
      operationId: getFiling
      summary: Get Lobbying Filing by UUID
      description: Retrieve a specific lobbying disclosure filing by its UUID.
      parameters:
        - name: filing_uuid
          in: path
          required: true
          description: Unique identifier (UUID) of the filing
          schema:
            type: string
            format: uuid
        - name: format
          in: query
          schema:
            type: string
            enum: [json]
            default: json
      responses:
        '200':
          description: Filing details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Filing'
        '404':
          description: Filing not found
  /registrants/:
    get:
      tags:
        - Registrants
      operationId: listRegistrants
      summary: List Lobbying Registrants
      description: Returns a paginated list of lobbying registrants (firms and individuals).
      parameters:
        - name: name
          in: query
          description: Filter by registrant name (partial match)
          schema:
            type: string
        - name: page
          in: query
          schema:
            type: integer
            default: 1
        - name: format
          in: query
          schema:
            type: string
            enum: [json]
            default: json
      responses:
        '200':
          description: Paginated list of registrants
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RegistrantListResponse'
  /registrants/{id}/:
    get:
      tags:
        - Registrants
      operationId: getRegistrant
      summary: Get Registrant by ID
      description: Retrieve a specific lobbying registrant by ID.
      parameters:
        - name: id
          in: path
          required: true
          description: Registrant ID
          schema:
            type: integer
        - name: format
          in: query
          schema:
            type: string
            enum: [json]
            default: json
      responses:
        '200':
          description: Registrant details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Registrant'
        '404':
          description: Not found
  /clients/:
    get:
      tags:
        - Clients
      operationId: listClients
      summary: List Lobbying Clients
      description: Returns a paginated list of clients on whose behalf lobbying is conducted.
      parameters:
        - name: name
          in: query
          description: Filter by client name (partial match)
          schema:
            type: string
        - name: page
          in: query
          schema:
            type: integer
            default: 1
        - name: format
          in: query
          schema:
            type: string
            enum: [json]
            default: json
      responses:
        '200':
          description: Paginated list of clients
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ClientListResponse'
  /clients/{id}/:
    get:
      tags:
        - Clients
      operationId: getClient
      summary: Get Client by ID
      description: Retrieve a specific lobbying client by ID.
      parameters:
        - name: id
          in: path
          required: true
          description: Client ID
          schema:
            type: integer
        - name: format
          in: query
          schema:
            type: string
            enum: [json]
            default: json
      responses:
        '200':
          description: Client details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Client'
        '404':
          description: Not found
  /lobbyists/:
    get:
      tags:
        - Lobbyists
      operationId: listLobbyists
      summary: List Lobbyists
      description: Returns a paginated list of individual lobbyist records.
      parameters:
        - name: name
          in: query
          description: Filter by lobbyist name (partial match)
          schema:
            type: string
        - name: page
          in: query
          schema:
            type: integer
            default: 1
        - name: format
          in: query
          schema:
            type: string
            enum: [json]
            default: json
      responses:
        '200':
          description: Paginated list of lobbyists
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LobbyistListResponse'
  /lobbyists/{id}/:
    get:
      tags:
        - Lobbyists
      operationId: getLobbyist
      summary: Get Lobbyist by ID
      description: Retrieve a specific lobbyist record by ID.
      parameters:
        - name: id
          in: path
          required: true
          description: Lobbyist ID
          schema:
            type: integer
        - name: format
          in: query
          schema:
            type: string
            enum: [json]
            default: json
      responses:
        '200':
          description: Lobbyist details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Lobbyist'
        '404':
          description: Not found
  /contributions/:
    get:
      tags:
        - Contributions
      operationId: listContributions
      summary: List Contribution Reports (LD-203)
      description: Returns a paginated list of semi-annual campaign contribution reports.
      parameters:
        - name: registrant_name
          in: query
          description: Filter by registrant name
          schema:
            type: string
        - name: filing_year
          in: query
          schema:
            type: integer
        - name: filing_period
          in: query
          schema:
            type: string
        - name: page
          in: query
          schema:
            type: integer
            default: 1
        - name: format
          in: query
          schema:
            type: string
            enum: [json]
            default: json
      responses:
        '200':
          description: Paginated list of contribution reports
          content:
            application/json:
              schema:
                type: object
  /constants/filing/filingtypes/:
    get:
      tags:
        - Constants
      operationId: getFilingTypes
      summary: Get Filing Type Codes
      description: Returns all LDA filing type codes and their descriptions.
      parameters:
        - name: format
          in: query
          schema:
            type: string
            enum: [json]
            default: json
      responses:
        '200':
          description: Filing type codes
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
  /constants/filing/lobbyingactivityissues/:
    get:
      tags:
        - Constants
      operationId: getLobbyingIssues
      summary: Get Lobbying Activity Issue Codes
      description: Returns all issue area codes used to categorize lobbying activities.
      parameters:
        - name: format
          in: query
          schema:
            type: string
            enum: [json]
            default: json
      responses:
        '200':
          description: Issue codes list
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
  /constants/filing/governmententities/:
    get:
      tags:
        - Constants
      operationId: getGovernmentEntities
      summary: Get Government Entity Codes
      description: Returns all government entity codes for lobbied agencies and bodies.
      parameters:
        - name: format
          in: query
          schema:
            type: string
            enum: [json]
            default: json
      responses:
        '200':
          description: Government entity codes
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
  /constants/general/countries/:
    get:
      tags:
        - Constants
      operationId: getCountries
      summary: Get Country Codes
      description: Returns country code reference data.
      security: []
      responses:
        '200':
          description: Country codes
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
  /constants/general/states/:
    get:
      tags:
        - Constants
      operationId: getStates
      summary: Get US State Codes
      description: Returns US state code reference data.
      security: []
      responses:
        '200':
          description: State codes
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: Authorization
      description: "Token-based auth. Format: 'Token YOUR_API_KEY'"
  schemas:
    FilingListResponse:
      type: object
      properties:
        count:
          type: integer
          description: Total number of matching filings
        next:
          type: string
          format: uri
          nullable: true
        previous:
          type: string
          format: uri
          nullable: true
        results:
          type: array
          items:
            $ref: '#/components/schemas/Filing'
    Filing:
      type: object
      description: A lobbying disclosure filing (LD-1, LD-2, or LD-203)
      properties:
        url:
          type: string
          format: uri
        filing_uuid:
          type: string
          format: uuid
          description: Unique identifier for this filing
        filing_type:
          type: string
          description: Filing type code (LD1, LD2, MM, etc.)
        filing_type_display:
          type: string
          description: Human-readable filing type
        filing_year:
          type: integer
        filing_period:
          type: string
        filing_period_display:
          type: string
        filing_document_url:
          type: string
          format: uri
          description: URL to the PDF version of the filing
        income:
          type: number
          nullable: true
          description: Reported lobbying income (for lobbying firms)
        expenses:
          type: number
          nullable: true
          description: Reported lobbying expenses (for self-employed lobbyists)
        dt_posted:
          type: string
          format: date-time
        registrant:
          $ref: '#/components/schemas/Registrant'
        client:
          $ref: '#/components/schemas/Client'
        lobbying_activities:
          type: array
          items:
            $ref: '#/components/schemas/LobbyingActivity'
    RegistrantListResponse:
      type: object
      properties:
        count:
          type: integer
        next:
          type: string
          format: uri
          nullable: true
        previous:
          type: string
          format: uri
          nullable: true
        results:
          type: array
          items:
            $ref: '#/components/schemas/Registrant'
    Registrant:
      type: object
      description: A lobbying firm or self-employed lobbyist registration
      properties:
        id:
          type: integer
        url:
          type: string
          format: uri
        house_registrant_id:
          type: integer
        name:
          type: string
          description: Name of the lobbying firm or individual
        description:
          type: string
          nullable: true
        address_1:
          type: string
          nullable: true
        city:
          type: string
          nullable: true
        state:
          type: string
          nullable: true
        zip:
          type: string
          nullable: true
        country:
          type: string
        contact_name:
          type: string
        contact_telephone:
          type: string
        dt_updated:
          type: string
          format: date-time
    ClientListResponse:
      type: object
      properties:
        count:
          type: integer
        next:
          type: string
          format: uri
          nullable: true
        previous:
          type: string
          format: uri
          nullable: true
        results:
          type: array
          items:
            $ref: '#/components/schemas/Client'
    Client:
      type: object
      description: A client on whose behalf lobbying activities are conducted
      properties:
        id:
          type: integer
        url:
          type: string
          format: uri
        client_id:
          type: integer
        name:
          type: string
          description: Name of the client organization
        general_description:
          type: string
          nullable: true
        client_government_entity:
          type: boolean
          nullable: true
        state:
          type: string
          nullable: true
        country:
          type: string
        effective_date:
          type: string
          format: date
    LobbyistListResponse:
      type: object
      properties:
        count:
          type: integer
        next:
          type: string
          format: uri
          nullable: true
        previous:
          type: string
          format: uri
          nullable: true
        results:
          type: array
          items:
            $ref: '#/components/schemas/Lobbyist'
    Lobbyist:
      type: object
      description: An individual lobbyist
      properties:
        id:
          type: integer
        url:
          type: string
          format: uri
        prefix:
          type: string
          nullable: true
        first_name:
          type: string
        last_name:
          type: string
        suffix:
          type: string
          nullable: true
        covered_position:
          type: string
          nullable: true
          description: Former government position if covered official
        is_active_lobbyist:
          type: boolean
    LobbyingActivity:
      type: object
      description: A lobbying activity record within a filing
      properties:
        general_issue_code:
          type: string
          description: Issue area code (e.g., TAX, HCR, DEF)
        general_issue_code_display:
          type: string
        description:
          type: string
          nullable: true
          description: Specific issues lobbied on
        government_entities:
          type: array
          items:
            type: object
            properties:
              name:
                type: string
          description: Government bodies lobbied
        lobbyists:
          type: array
          items:
            type: object
            properties:
              lobbyist:
                $ref: '#/components/schemas/Lobbyist'
              is_new:
                type: boolean