EID.uids

The IDs from this source, as an array of UID objects, each holding the identifier and the type of agent it came from.

Currentobject arrayOptionalSince 2.6-202204

Field facts

Path: user.eids.uids
Object: EID
Type: object array
Requirement: Optional
Added: OpenRTB 2.6-202204
Spec section: 3.2.27

How it is used

Group all IDs from one source and match path in one EID. An entry with an empty array carries nothing, so drop it instead of sending a placeholder.

Example

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

{
  "id": "req-1",
  "user": {
    "eids": [
      {
        "uids": [
          {
            "id": "XY1000000000000EXAMPLE",
            "atype": 3
          }
        ]
      }
    ]
  }
}

Common mistakes

Sending uids as a single object or as an array of bare strings instead of UID objects.
Sending an empty or missing uids array, which RTBlint reports.

Version history

Added in OpenRTB 2.6-202204, 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
2.6-202204	Added in the first 2.6 release, published without a structured text archive; the 2.6-202210 republication is the first tagged text.
2.6-202210 to 2.6-202606	object array	No	No

Related fields

Other EID fields

For a walkthrough of the whole object, read User identity and EIDs.