---
title: "Changes to Create Advertising Unit"
method: POST
path: "/advertising_units"
---

# Changes to Create Advertising Unit

`POST /advertising_units`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 5 of 43 revisions.

- **2026-07-13** `228cc05ba97d`: 1 info
- **2026-06-07** `13f3bc084194`: 5 breaking, 2 warning, 27 info
- **2026-01-17** `8590daeecaea`: 2 breaking
- **2025-07-11** `b3fb230c0938`: 1 info
- **2025-02-18** `7b086652e3cf`: 2 info

## Changes

- **2026-07-13** `228cc05ba97d`: 1 info
  - added the non-success response with the status `429`
- **2026-06-07** `13f3bc084194`: 5 breaking, 2 warning, 27 info
  - the request property `title` became required
  - response property `price` list-of-types was widened by adding types `null` to media type `application/json` of response `201`
  - response property `slots/items/invoice_url` list-of-types was widened by adding types `null` to media type `application/json` of response `201`
  - the `code` response's property type changed from no type to `string` for status `400`
  - the `code` response's property type changed from no type to `string` for status `403`
  - the `title` request property's maxLength was set to `100`
  - added the new `held` enum value to the `slots/items/status` response property for the response status `201`
  - the endpoint scheme security `ApiKeyAuth` was added to the API
  - the endpoint scheme security `PermissionAuthenticationRequirement` was removed from the API
  - api tag `Advertising Units` added
  - added the new optional request property `allows_html`
  - added the new optional request property `allows_image`
  - added the new optional request property `max_characters`
  - added the new optional request property `submission_deadline_days`
  - the `description` request property default value `` was added
  - request property `price` list-of-types was widened by adding types `null` to media type `application/json`
  - added the non-success response with the status `401`
  - added the optional property `max_characters` to the response with the `201` status
  - added the optional property `slots/items/content_approved_at` to the response with the `201` status
  - added the optional property `slots/items/content_image_id` to the response with the `201` status
  - added the optional property `slots/items/content_rejected_at` to the response with the `201` status
  - added the optional property `slots/items/content_submitted_at` to the response with the `201` status
  - added the required property `allows_html` to the response with the `201` status
  - added the required property `allows_image` to the response with the `201` status
  - added the required property `slots/items/content_rejection_reason` to the response with the `201` status
  - added the required property `slots/items/content_url` to the response with the `201` status
  - added the required property `slots/items/creation_date` to the response with the `201` status
  - added the required property `slots/items/inquiry_message` to the response with the `201` status
  - added the required property `slots/items/sku_id` to the response with the `201` status
  - added the required property `slots/items/sponsor_company` to the response with the `201` status
  - added the required property `slots/items/sponsor_email` to the response with the `201` status
  - added the required property `slots/items/sponsor_name` to the response with the `201` status
  - added the required property `slots/items/submission_url` to the response with the `201` status
  - added the required property `submission_deadline_days` to the response with the `201` status
- **2026-01-17** `8590daeecaea`: 2 breaking
  - the `id` response's property format changed from `uuid` to no format for status `201`
  - the `slots/items/id` response's property format changed from `uuid` to no format for status `201`
- **2025-07-11** `b3fb230c0938`: 1 info
  - added the required property `slots/items/content` to the response with the `201` status
- **2025-02-18** `7b086652e3cf`: 2 info
  - the endpoint scheme security `PermissionAuthenticationRequirement` was added to the API
  - the endpoint scheme security `AuthenticationRequirement` was removed from the API

---

[Operation](https://skmtc.dev/buttondown/apis/buttondown-api/docs/advertising_units/post.md) - [API](https://skmtc.dev/buttondown/apis/buttondown-api.md) - [Page](https://skmtc.dev/buttondown/apis/buttondown-api/changes/advertising_units/post)