openapi: 3.0.3
info:
  title: BuiltWith Change Bulk Processing Technology Trends API
  description: 'Track technology additions and removals on websites with business context. Returns AI-generated summaries explaining the business significance of technology changes. Credits are only consumed when changes are found.

    '
  version: change1
  contact:
    name: BuiltWith Support
    url: https://builtwith.com/contact
  termsOfService: https://builtwith.com/terms
  license:
    name: Commercial
    url: https://builtwith.com/plans
servers:
- url: https://api.builtwith.com/change1
  description: BuiltWith Change API v1
security:
- apiKeyQuery: []
- apiKeyHeader: []
tags:
- name: Technology Trends
  description: Technology adoption trends and market share data
paths:
  /api.json:
    get:
      summary: Get technology trend data (JSON)
      description: 'Returns trend data for a web technology including adoption metrics across top 10K, 100K, 1M, and full internet segments. Optionally retrieve historical data for a specific date.

        '
      operationId: getTechTrendJson
      tags:
      - Technology Trends
      parameters:
      - $ref: '#/components/parameters/KEY'
      - $ref: '#/components/parameters/TECH'
      - $ref: '#/components/parameters/DATE'
      responses:
        '200':
          description: Technology trend data
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TrendsResponse'
              example:
                Trends:
                  Tech:
                    Name: Shopify
                    Description: Ecommerce platform for online stores
                    Link: https://www.shopify.com/
                    Tag: ecommerce
                    Categories:
                    - Ecommerce
                    - Shopping Cart
                    Coverage:
                      TenK: 1250
                      HundredK: 8500
                      Mil: 45000
                      Internet: 5000000
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /api.xml:
    get:
      summary: Get technology trend data (XML)
      description: Returns trend data for a web technology in XML format.
      operationId: getTechTrendXml
      tags:
      - Technology Trends
      parameters:
      - $ref: '#/components/parameters/KEY'
      - $ref: '#/components/parameters/TECH'
      - $ref: '#/components/parameters/DATE'
      responses:
        '200':
          description: Technology trend data in XML
          content:
            application/xml:
              schema:
                type: object
components:
  schemas:
    TrendCoverage:
      type: object
      description: Adoption metrics across different traffic segments
      properties:
        TenK:
          type: integer
          description: Count among top 10,000 websites
        HundredK:
          type: integer
          description: Count among top 100,000 websites
        Mil:
          type: integer
          description: Count among top 1,000,000 websites
        Internet:
          type: integer
          description: Total count across the full internet dataset
        Live:
          type: integer
          description: Currently active detections
        Historical:
          type: integer
          description: Historical total detections (including inactive)
    TrendsResponse:
      type: object
      properties:
        Trends:
          type: object
          properties:
            Tech:
              $ref: '#/components/schemas/TechTrend'
    ErrorResponse:
      type: object
      properties:
        Errors:
          type: array
          items:
            type: object
            properties:
              Code:
                type: integer
              Message:
                type: string
    TechTrend:
      type: object
      description: Technology trend information and coverage metrics
      properties:
        Name:
          type: string
          description: Technology name
          example: Shopify
        Description:
          type: string
          description: Technology description
        Link:
          type: string
          format: uri
          description: Official technology website
        Icon:
          type: string
          format: uri
          description: CDN URL for technology icon
        IsPremium:
          type: string
          description: SaaS designation (Yes/No/Maybe)
          enum:
          - 'Yes'
          - 'No'
          - Maybe
        Tag:
          type: string
          description: Primary category tag
          example: ecommerce
        Categories:
          type: array
          items:
            type: string
          description: Subcategory labels
        TrendsLink:
          type: string
          format: uri
          description: BuiltWith trends page URL for this technology
        Coverage:
          $ref: '#/components/schemas/TrendCoverage'
  parameters:
    TECH:
      name: TECH
      in: query
      description: Technology name with spaces replaced by dashes (e.g. Google-Analytics)
      required: true
      schema:
        type: string
        example: Shopify
    DATE:
      name: DATE
      in: query
      description: ISO 8601 date for historical trend data retrieval
      required: false
      schema:
        type: string
        format: date
        example: '2026-01-20'
    KEY:
      name: KEY
      in: query
      required: false
      schema:
        type: string
        format: uuid
        example: 00000000-0000-0000-0000-000000000000
  responses:
    Unauthorized:
      description: Unauthorized — invalid or missing API key
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    BadRequest:
      description: Bad request — invalid parameters
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  securitySchemes:
    apiKeyQuery:
      type: apiKey
      in: query
      name: KEY
    apiKeyHeader:
      type: apiKey
      in: header
      name: Authorization
      description: 'Format: ''Authorization: API {key}'''
externalDocs:
  description: BuiltWith Change API Documentation
  url: https://api.builtwith.com/change-api