Bid.crid

The bidder's creative ID, used by exchanges for ad quality checks, creative approval, and reporting problems back to the bidder.

CurrentstringOptionalSince 2.0

Field facts

Path: seatbid.bid.crid
Object: Bid
Type: string
Requirement: Optional
Added: OpenRTB 2.0
Spec section: 4.2.3

How it is used

Exchanges that review creatives before they can serve tie the approval to this ID, so it must stay the same for the same creative and change when the creative changes.

Example

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

{
  "seatbid": [
    {
      "bid": [
        {
          "crid": "cr-5521"
        }
      ]
    }
  ]
}

Common mistakes

Generating a new crid per bid, which forces repeated review or keeps the creative blocked.
Reusing one crid for different creatives, so an approval covers markup nobody reviewed.

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	string or ref wit	No	No
2.1 to 2.2	string	No	No
2.3 to 2.6-202606	string	No	No

Related fields

Other Bid fields

For a walkthrough of the whole object, read Bid response anatomy.