---
title: "Create an SMS topic"
method: POST
path: "/sms/topics"
tags: ["SMS topics"]
---

# Create an SMS topic

`POST /sms/topics`

## Request

- Base URL: `https://www.unitpost.com/api/v1`
- URL: `https://www.unitpost.com/api/v1/sms/topics`
- Auth: HTTP bearer

Create an SMS subscription topic. `default_opt_in` decides whether contacts with no explicit preference are treated as subscribed. Names are unique per channel, so an SMS topic may share a name with an email topic. Topics are a plan feature: an unentitled workspace gets `403` with `limit_reached`. Requires the `topics:write` capability.

## Request body

- TopicCreate
  - `name` string, required
  - `description` string
  - `default_opt_in` boolean

## Response `201`

Created.

- Topic
  - `object` 'topic', required
  - `id` string, required
  - `name` string, required
  - `description` string, nullable, required
  - `channel` 'email' | 'sms', required: Which channel the topic belongs to. Email topics are managed under `/email/topics`, SMS topics under `/sms/topics`.
  - `default_opt_in` boolean, required
  - `created_at` string, required
  - `updated_at` string, required

## Other responses

- `401`: Missing or invalid API key.
- `403`: Insufficient scope, or topics aren't on your plan (`limit_reached`).
- `404`: SMS is not enabled for this workspace.
- `409`: An SMS topic with that name already exists.
- `422`: Validation error.

---

[API](https://skmtc.dev/unitpost/apis/unitpost-api.md) · [All operations](https://skmtc.dev/unitpost/apis/unitpost-api/llms.txt) · [OpenAPI document](https://skmtc.dev/unitpost/apis/unitpost-api/revisions/86ff7c890967?raw)