Category taxonomies value 7 means IAB Tech Lab Content Taxonomy 3.0

When to send it

Value 7 selects Content Taxonomy 3.0. Sellers that classify pages, apps or streams with 3.0 send it in Site.cattax, App.cattax, Content.cattax and the other content-side fields, and buyers with 3.0 mappings use the IDs for contextual targeting and brand safety.

It is confused with 9 (Content Taxonomy 3.1), the later revision that OpenRTB also uses as the default genre taxonomy. Never send 3.0 IDs with cattax 1 or with no cattax; the buyer will look for IAB-prefixed codes and find none.

Example

{
  "app": {
    "cattax": 7
  }
}

Fields that carry it

• app.cattax
• seatbid.bid.cattax
• cattax
• app.content.cattax
• app.content.gtax
• app.content.producer.cattax
• app.publisher.cattax
• site.cattax

Other values in category taxonomies

The category taxonomies list page explains the whole list and its common mistakes.