Kit Broadcasts API

openapi: 3.1.0
info:
  title: Kit API V4 Account Broadcasts API
  description: Kit (formerly ConvertKit) API V4 for email marketing and the creator economy. Manage subscribers, broadcasts, tags, custom fields, forms, and account-level statistics. Supports OAuth 2.0 and API key authentication.
  version: v4
  contact:
    name: Kit Developer Support
    url: https://developers.kit.com/v4/api-reference
servers:
- url: https://api.kit.com/v4
  description: Kit API V4 production server
security:
- ApiKeyAuth: []
- OAuth2: []
tags:
- name: Broadcasts
  description: One-off email broadcasts
paths:
  /broadcasts:
    get:
      operationId: listBroadcasts
      summary: List Broadcasts
      description: List all broadcasts, including drafts, scheduled, and sent.
      tags:
      - Broadcasts
      responses:
        '200':
          description: Successful response with broadcast list
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BroadcastListResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createBroadcast
      summary: Create Broadcast
      description: Create a new broadcast as a draft or scheduled send.
      tags:
      - Broadcasts
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BroadcastRequest'
      responses:
        '201':
          description: Broadcast created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BroadcastResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    ErrorResponse:
      type: object
      properties:
        errors:
          type: array
          items:
            type: string
    Broadcast:
      type: object
      properties:
        id:
          type: integer
        subject:
          type: string
        preview_text:
          type: string
        description:
          type: string
        content:
          type: string
        public:
          type: boolean
        published_at:
          type: string
          format: date-time
          nullable: true
        send_at:
          type: string
          format: date-time
          nullable: true
        created_at:
          type: string
          format: date-time
    BroadcastRequest:
      type: object
      required:
      - subject
      properties:
        subject:
          type: string
        preview_text:
          type: string
        description:
          type: string
        content:
          type: string
        public:
          type: boolean
        send_at:
          type: string
          format: date-time
          nullable: true
    BroadcastListResponse:
      type: object
      properties:
        broadcasts:
          type: array
          items:
            $ref: '#/components/schemas/Broadcast'
    BroadcastResponse:
      type: object
      properties:
        broadcast:
          $ref: '#/components/schemas/Broadcast'
  responses:
    Unauthorized:
      description: Missing or invalid credentials
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-Kit-Api-Key
      description: Personal API key issued from the Kit developer portal
    OAuth2:
      type: oauth2
      flows:
        authorizationCode:
          authorizationUrl: https://app.kit.com/oauth/authorize
          tokenUrl: https://api.kit.com/oauth/token
          scopes: {}