> ## Documentation Index
> Fetch the complete documentation index at: https://technologychecker.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Get domain technologies API

> Look up the active and historical technologies detected on any domain. Returns the full technology stack including category, first/last seen dates, and subdomain information. Costs 1 credit per request.

## Frequently asked questions

<AccordionGroup>
  <Accordion title="What does the domain technologies endpoint return?">
    This endpoint returns two arrays: `active_technologies` (currently detected on the domain) and `historical_technologies` (previously detected but no longer active). Each technology includes its name, category, first seen date, last seen date, and the subdomain where it was found.
  </Accordion>

  <Accordion title="How much does a domain technology lookup cost?">
    Each domain lookup costs 1 credit. Results come from TechnologyChecker's pre-crawled database of 50M+ domains, so responses are instant. If the domain isn't in the database, you'll get a 404. Try [live detection](/api-reference/live-detection/technology-lookup-live-api) instead (5 credits) for domains not yet crawled.
  </Accordion>

  <Accordion title="Can I look up subdomains separately?">
    The endpoint accepts root domains (e.g., `shopify.com`). Technologies detected on subdomains are included in the response with the `subdomain` field showing where each technology was found. You don't need to query subdomains individually.
  </Accordion>
</AccordionGroup>


## OpenAPI

````yaml GET /v1/domain/{domain}
openapi: 3.1.0
info:
  title: TechnologyChecker API
  description: >-
    Discover technology stacks, track market trends, and enrich data with
    company intelligence.
  version: 1.0.0
  contact:
    name: TechnologyChecker Support
    email: support@technologychecker.io
    url: https://technologychecker.io
servers:
  - url: https://api.technologychecker.io
    description: Production
security:
  - bearerAuth: []
tags:
  - name: Domain technologies
    description: Look up technologies detected on any domain
  - name: Technology data
    description: Search, look up, and get details on tracked technologies
  - name: Market intelligence
    description: Technology stats, trends, and market share
  - name: Company data
    description: Firmographic and company intelligence
  - name: Live detection
    description: Real-time technology detection with browser rendering
paths:
  /v1/domain/{domain}:
    get:
      tags:
        - Domain technologies
      summary: Get domain technologies API
      description: >-
        Look up the active and historical technologies detected on any domain.
        Returns the full technology stack including category information.
      operationId: getDomainTechnologies
      parameters:
        - name: domain
          in: path
          required: true
          description: The domain to look up (e.g., `shopify.com`)
          schema:
            type: string
            example: shopify.com
      responses:
        '200':
          description: Technology stack for the domain
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                    example: true
                  data:
                    type: object
                    properties:
                      domain:
                        type: string
                        example: shopify.com
                      active_technologies:
                        type: array
                        items:
                          $ref: '#/components/schemas/DomainTechnology'
                      historical_technologies:
                        type: array
                        items:
                          $ref: '#/components/schemas/DomainTechnology'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
        '429':
          $ref: '#/components/responses/RateLimited'
components:
  schemas:
    DomainTechnology:
      type: object
      properties:
        id:
          type: integer
          example: 2
        name:
          type: string
          example: Cloudflare
        category:
          type: string
          example: CDN
        first_seen:
          type: string
          example: '2020-05-08 00:00:00'
        last_seen:
          type: string
          example: '2026-01-08 00:00:00'
        subdomain:
          type: string
          nullable: true
          example: SHOPIFY.COM
    ApiError:
      type: object
      properties:
        success:
          type: boolean
          example: false
        error:
          type: object
          properties:
            code:
              type: string
              example: UNAUTHORIZED
            message:
              type: string
              example: Missing or invalid API key
  responses:
    Unauthorized:
      description: Missing or invalid API key
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
    NotFound:
      description: Resource not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
    RateLimited:
      description: Rate limit exceeded
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        API key in format `tapi_live_[32-char]` (live) or `tapi_test_[32-char]`
        (test)

````