---
title: "Subscribe Channel Preview"
method: POST
path: "/api/billing/channels/subscribe/preview"
tags: ["billing", "billing"]
---

# Subscribe Channel Preview

`POST /api/billing/channels/subscribe/preview`

## Request

- Base URL: `https://api.dialogbrain.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.dialogbrain.com/api/billing/channels/subscribe/preview`
- Auth: none declared

Read-only preview: what's the price, what methods are available,
what's the saved default? Frontend decides whether to show the chooser
or auto-proceed with the saved default.

Safe to retry: never mutates state. The only non-preview caller that
cares about the ``choose_method`` status — every other gate caller
uses ``raise_if_blocked`` to turn it into a 402.

## Request body

- SubscribePreviewRequest
  - `channel_type` string, required
  - `channel_account_id` integer, nullable

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/dialogbrain/apis/dialogbrain-v2-api-gateway.md) · [All operations](https://skmtc.dev/dialogbrain/apis/dialogbrain-v2-api-gateway/llms.txt) · [OpenAPI document](https://skmtc.dev/dialogbrain/apis/dialogbrain-v2-api-gateway/revisions/77bef09a9209?raw)