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

# Get filter reference data

> Returns the values filter criteria accept: languages, countries, regions, subregions, sites with their categories, and client rank levels. Use the ids in the criteria of POST /filters and PATCH /filters/{id}



## OpenAPI

````yaml get /filters/reference-data
openapi: 3.0.4
info:
  title: Vollna API
  description: API for managing Upwork profiles, proposals, results, and filters
  version: 1.0.0
servers:
  - url: https://api.vollna.com/v1
security: []
tags:
  - name: Profiles
    description: Manage Upwork profiles
  - name: Proposals
    description: Access and manage Upwork proposals
  - name: Results
    description: View monitoring results and projects
  - name: Filters
    description: Manage monitoring filters
  - name: Auto Bidding
    description: Manage auto bidding jobs and setups
  - name: Account
    description: The token team's account, plan and meters
  - name: Invitations
    description: Upwork invitations
  - name: Projects
    description: Upwork jobs and their competition
  - name: AI Qualifier
    description: A filter's AI qualifier and its verdicts
  - name: Market Insights
    description: Upwork market analytics and saved searches
  - name: Proposal Templates
    description: Proposal templates and their results
paths:
  /filters/reference-data:
    get:
      tags:
        - Filters
      summary: Get filter reference data
      description: >-
        Returns the values filter criteria accept: languages, countries,
        regions, subregions, sites with their categories, and client rank
        levels. Use the ids in the criteria of POST /filters and PATCH
        /filters/{id}
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      languages:
                        type: array
                        items:
                          type: object
                          properties:
                            value:
                              type: string
                              description: ISO 639-1 code
                            name:
                              type: string
                      countries:
                        type: array
                        items:
                          type: object
                          properties:
                            value:
                              type: integer
                            name:
                              type: string
                            type:
                              type: string
                              example: country
                      regions:
                        type: array
                        items:
                          type: object
                          properties:
                            value:
                              type: integer
                            name:
                              type: string
                            type:
                              type: string
                              example: region
                      subRegions:
                        type: array
                        items:
                          type: object
                          properties:
                            value:
                              type: integer
                            name:
                              type: string
                            type:
                              type: string
                              example: subregion
                      sites:
                        type: array
                        items:
                          type: object
                          properties:
                            id:
                              type: integer
                            slug:
                              type: string
                            title:
                              type: string
                            categories:
                              type: array
                              items:
                                type: object
                                properties:
                                  id:
                                    type: integer
                                  title:
                                    type: string
                                  section:
                                    type: string
                                    description: Parent category; null for a parent
                                    nullable: true
                      clientRankMin:
                        type: array
                        items:
                          type: object
                          properties:
                            value:
                              type: integer
                            name:
                              type: string
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '403':
          $ref: '#/components/responses/Forbidden'
        '429':
          $ref: '#/components/responses/TooManyRequests'
      security:
        - apiToken: []
components:
  responses:
    BadRequest:
      description: >-
        Invalid request. message says what to send instead; fields names each
        invalid field
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ServiceError'
    Unauthorized:
      description: Missing or unknown API token
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    PaymentRequired:
      description: The team's subscription is not active
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Forbidden:
      description: >-
        The plan has no API access, or the token team may not do this. message
        says why
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ServiceError'
    TooManyRequests:
      description: More than 30 requests a minute. See Rate Limiting
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    ServiceError:
      type: object
      properties:
        error:
          type: string
          description: Short error title
          example: Validation failed
        message:
          type: string
          description: What went wrong and what to send instead, written for the user
        fields:
          type: object
          description: >-
            Per-field messages keyed by dot path, when several fields fail at
            once
          additionalProperties:
            type: string
    Error:
      type: object
      properties:
        error:
          type: string
  securitySchemes:
    apiToken:
      type: apiKey
      name: X-API-TOKEN
      in: header
      description: API token for authentication

````

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