> ## 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. # Preview lead list API > Page through a finished list's rows with sorting and search. Returns every stored column plus crawl-sourced contact data. Free. ## Frequently asked questions Yes. The preview returns all 14 stored company columns plus the `web` block with crawl-sourced emails, phones, social profile URLs and site language — deliberately identical to what the export ships, so what you see is what you download. Zero is the stored 'unknown' default for those numeric columns, not a real value. Treat `0` as missing. That domain has no crawled contact record. Contact enrichment is fail-open — a missing record yields `web: null` rather than dropping the row or failing the request. Fetch [the technology map](/docs/api-reference/lead-lists/technology-map-api) once and resolve locally. Exports resolve names server-side, so they need no lookup. ## OpenAPI ````yaml GET /v1/leads/lists/{id}/preview 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 - name: Signals description: >- Intent signals derived from technology state transitions: who adopted, who churned, who switched, and who has a gap in their stack. - name: Alerts description: >- Saved signal queries delivered to your webhook. Every signal you can query, you can subscribe to. - name: Audiences description: >- Saved groups of domains — uploaded lists or computed recipes — that you can profile, slice and monitor. - name: Lead lists description: >- Build and export targeted domain lists combining technology detection with company data. paths: /v1/leads/lists/{id}/preview: get: tags: - Lead lists summary: Preview lead list API description: >- Page through a finished list's rows with sorting and search. The preview returns **everything the list holds** — all 14 stored company columns plus the crawl-sourced `web` block — so what you see here is exactly what the export ships. Free. operationId: previewLeadList parameters: - name: id in: path required: true description: The lead list id. schema: type: string format: uuid example: f6ab2d94-c34f-47b7-9d1a-228e71488cd2 - name: limit in: query required: false description: Rows per page. Capped at 100. schema: type: integer default: 50 maximum: 100 - name: offset in: query required: false description: Pagination offset. schema: type: integer default: 0 - name: sort_by in: query required: false description: Column to sort by. schema: type: string enum: - domain - company_name - country - industry - employees - name: sort_order in: query required: false description: Sort direction. schema: type: string enum: - asc - desc default: asc - name: search in: query required: false description: Filter rows by domain or company name. schema: type: string responses: '200': description: A page of list rows content: application/json: schema: type: object properties: success: type: boolean example: true data: type: object properties: results: type: array items: $ref: '#/components/schemas/LeadListRow' total: type: integer example: 1000 limit: type: integer example: 50 offset: type: integer example: 0 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '404': $ref: '#/components/responses/NotFound' '429': $ref: '#/components/responses/RateLimited' components: schemas: LeadListRow: type: object properties: domain: type: string example: example.com detection_url: type: string example: EXAMPLE.COM technology_ids: type: array items: type: integer example: - 2 company_name: type: string example: Example Corp linkedin_url: type: string example: linkedin.com/company/example industry: type: string example: Software Development industry_code: type: integer description: '`0` means unknown.' example: 4 country: type: string example: United States city: type: string example: Austin state: type: string example: Texas founded: type: integer description: '`0` means unknown.' example: 2015 employees: type: string example: 51-200 company_type: type: string example: Privately Held associated_members: type: integer description: '`0` means unknown.' example: 42 web: type: object nullable: true description: >- Crawl-sourced contact data, matching what the export ships. `null` when the domain has no crawled row. properties: emails: type: array items: type: string example: - hi@example.com phones: type: array items: type: string example: - +1 555 0100 socials: type: object additionalProperties: type: string description: Only the platforms that domain publishes, as full profile URLs. example: linkedin: https://www.linkedin.com/company/example language: type: string example: en 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: BadRequest: description: Invalid or missing parameters content: application/json: schema: $ref: '#/components/schemas/ApiError' example: success: false error: code: VALIDATION_ERROR message: >- Provide exactly one scope: technology_id, technology or category_id. 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) ````