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

# Add a property to a watchlist

> Adds the property to the watchlist. Returns 409 if the property is already a member.

<Badge color="yellow" size="sm">Enterprise+ tier</Badge>


## OpenAPI

````yaml post /watchlists/{id}/properties/{propertyId}
openapi: 3.1.1
info:
  title: TIC Lens API
  description: "The TIC Lens API provides programmatic access to company, person, property, vehicle, and order data.\r\n\r\n## Authentication\r\n\r\nAll requests require an API key passed via the `x-api-key` header:\r\n\r\n```bash\r\ncurl -H \"x-api-key: YOUR_API_KEY\" https://lens-api.tic.io/companies/123\r\n```\r\n\r\nAPI keys are managed through the TIC Lens web application under **Settings → API Keys**.\r\n\r\n## Base URL\r\n\r\n| Environment | URL |\r\n|-------------|-----|\r\n| Production  | `https://lens-api.tic.io` |\r\n\r\n## Feature Access\r\n\r\nEndpoints are gated by your subscription plan. If your plan does not include a feature, the endpoint will return `403 Forbidden`.\r\n\r\n## Rate Limits\r\n\r\nRate limits are applied per API key. If you exceed the limit, requests will return `429 Too Many Requests`.\r\n\r\n## Response Format\r\n\r\nAll responses are JSON. Null values are omitted from responses.\r\n"
  version: v1
servers:
  - url: https://lens-api.tic.io
security:
  - ApiKey: []
tags:
  - name: Addresses
  - name: Bolagsverket
  - name: Brf
  - name: Companies
  - name: Documents
  - name: FlightImages
  - name: Free
  - name: Orders
  - name: OrdersExports
  - name: PaymentControl
  - name: PaymentControlImport
  - name: Persons
  - name: Properties
  - name: PublicSearch
  - name: SearchAutocomplete
  - name: Sentinel
  - name: ServingPermits
  - name: Team
  - name: Teams
  - name: Transportstyrelsen
  - name: Vehicles
  - name: WatchList
paths:
  /watchlists/{id}/properties/{propertyId}:
    post:
      tags:
        - WatchList
      summary: Add a property to a watchlist
      description: >-
        Adds the property to the watchlist. Returns 409 if the property is
        already a member.
      operationId: AddWatchListPropertyMember
      parameters:
        - name: id
          in: path
          description: Watchlist GUID
          required: true
          schema:
            type: string
            format: uuid
        - name: propertyId
          in: path
          description: Internal property ID to add
          required: true
          schema:
            type: integer
            format: int32
      responses:
        '201':
          description: Property added to watchlist
        '404':
          description: Watchlist not found in this team
        '409':
          description: Property is already a member of this watchlist
components:
  securitySchemes:
    ApiKey:
      type: apiKey
      name: x-api-key
      in: header

````