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

> Estimate how many participants in Respondent's panel match your project's targeting criteria. Use this to validate your audience configuration before publishing.

# Retrieve audience size estimate



## OpenAPI

````yaml get /v1/projects/{projectId}/feasibility/audience-size-estimate
openapi: 3.0.0
info:
  title: Partner API
  description: Public API for partner integrations
  version: '1.0'
  contact: {}
servers:
  - url: https://api-staging.respondent.io
security: []
tags: []
paths:
  /v1/projects/{projectId}/feasibility/audience-size-estimate:
    get:
      tags:
        - projects
      summary: Retrieve audience size estimate
      description: |-
        Get estimate of audience size for a project.
        Only available for projects in the status of draft.
      operationId: ProjectsController_projectAudienceSizeEstimate
      parameters:
        - name: x-api-key
          in: header
          required: true
          schema:
            type: string
        - name: x-api-secret
          in: header
          required: true
          schema:
            type: string
        - name: projectId
          required: true
          in: path
          schema:
            type: string
      responses:
        '200':
          description: ''
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AudienceSizeEstimate'
components:
  schemas:
    AudienceSizeEstimate:
      type: object
      properties:
        exactAudienceMatch:
          type: number
          description: >-
            Active users over previous 90 days that are an exact match for the
            audience defined in the project.
        eligibleAudience:
          type: number
          description: >-
            Active users over the previous 90 days that receive a high
            similarity score for the audience defined in

            the project and are able to apply, but may be less than 100%
            qualified.
      required:
        - exactAudienceMatch
        - eligibleAudience

````