UID.id

The identifier itself, as a string in the format its source defines. The table does not mark it required, but a UID without an id carries nothing, and RTBlint reports it.

CurrentstringOptionalSince 2.6-202204

Field facts

Path: user.eids.uids.id
Object: UID
Type: string
Requirement: Optional
Added: OpenRTB 2.6-202204
Spec section: 3.2.28

Example

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

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

Common mistakes

Sending a raw email address or phone number. Identity providers expect their own token or hash format, and raw personal data does not belong in a bid request.
Sending an empty string as a placeholder.

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	string	No	No

Related fields

Other UID fields

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