Content.ext

Exchange-specific extensions for the content. The spec defines nothing inside it, so its contents depend on the exchange's own documentation.

CurrentobjectOptionalSince 2.1

Field facts

For identifiers from external content ID systems, use Data.cids on a content Data object (since 2.6-202505) rather than an extension.

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

{
  "id": "req-1",
  "app": {
    "content": {
      "ext": {}
    }
  }
}

Added in OpenRTB 2.1, 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
2.1	object	No	No
2.2	object cu Op be	No	No
2.3 to 2.3.1	object	No	No
2.4	object	No	No
2.5 to 2.6-202606	object	No	No