---
title: "POST /v1/workspaces/{workspaceId}/campaigns/coverage-preview"
method: POST
path: "/v1/workspaces/{workspaceId}/campaigns/coverage-preview"
---

# POST /v1/workspaces/{workspaceId}/campaigns/coverage-preview

`POST /v1/workspaces/{workspaceId}/campaigns/coverage-preview`

## Request

- Base URL: `https://api.bangermail.com`
- URL: `https://api.bangermail.com/v1/workspaces/{workspaceId}/campaigns/coverage-preview`
- Auth: HTTP bearer

Required placeholders an audience cannot fill, before any Broadcast is saved.

## Request body

- object
  - `subject` string
  - `body_text` string
  - `body_html` string
  - `content` object
  - `audience` CampaignAudience, required: Select all subscribed contacts or at least one nonempty contact_ids, list_ids, or segment_ids list.
    - `all_subscribed` boolean
    - `contact_ids` string[]
    - `list_ids` string[]
    - `segment_ids` string[]
  - `sample_email` string
  - `template_id` string, uuid

## Response `200`

Successful response.

- object
  - `data` object, required
    - `required_variables` string[], required
    - `audience_count` integer, required
    - `gaps` object[], required
      - `variable` string, required
      - `missing_count` integer, required
      - `sample_emails` string[], required

---

[API](https://skmtc.dev/bangermail/apis/banger-api.md) · [All operations](https://skmtc.dev/bangermail/apis/banger-api/llms.txt) · [OpenAPI document](https://skmtc.dev/bangermail/apis/banger-api/revisions/a149909267f9?raw)