# Get Company Signal Filters (Discovery)

Returns all available filter types for company signals and whether each requires a search query.

Endpoint: GET /v3/companies/signals/filters
Security: ApiKeyAuth

## Response 200 fields (application/json):

  - `availableFilters` (array)

  - `availableFilters.filterType` (string)

  - `availableFilters.requiresQuery` (boolean)

## Response 401 fields (application/json):

  - `statusCode` (integer, required)
    HTTP status code
    Example: 400

  - `message` (string, required)
    Error message
    Example: "Validation failed"

  - `errors` (array)
    Detailed error messages (optional, only for validation errors)
    Example: ["entityType must be one of: contact, company"]

## Response 403 fields (application/json):

  - `statusCode` (integer, required)
    HTTP status code
    Example: 400

  - `message` (string, required)
    Error message
    Example: "Validation failed"

  - `errors` (array)
    Detailed error messages (optional, only for validation errors)
    Example: ["entityType must be one of: contact, company"]