Publisher.cat

Content categories describing the publisher's business as a whole, as taxonomy IDs in the scheme named by Publisher.cattax.

Currentstring arrayOptionalSince 2.0

Field facts

Path: app.publisher.cat, dooh.publisher.cat, site.publisher.cat
Object: Publisher
Type: string array
Requirement: Optional
Added: OpenRTB 2.0
Spec section: 3.2.15

How it is used

This is the coarsest category signal in a request. Buyers rely on Site.cat, App.cat, and Content.cat for anything specific, so a single broad ID is enough here.

Example

Where the field sits in a payload, with everything else left out:

{
  "id": "req-1",
  "app": {
    "publisher": {
      "cat": [
        "IAB12"
      ]
    }
  }
}

Common mistakes

Sending free-text labels such as "Media" instead of taxonomy IDs.

Version history

Added in OpenRTB 2.0, and present in the latest snapshot. The table shows how each version's spec text types the field.

Versions	Type in the spec	Required	Deprecated
2.0 to 2.1	array of string	No	No
2.2	array of strings	No	No
2.3 to 2.3.1	string array	No	No
2.4	string array	No	No
2.5 to 2.6-202606	string array	No	No