BidResponse.bidid

A response ID the bidder generates for its own logging and tracking. The exchange can return it in win and billing notices through the ${AUCTION_BID_ID} macro.

CurrentstringOptionalSince 2.0

Field facts

Path: bidid
Object: BidResponse
Type: string
Requirement: Optional
Added: OpenRTB 2.0
Spec section: 4.2.1

How it is used

It lets a bidder use one static notice URL for every bid and still find the response a notice refers to. OpenRTB 2.3.1 corrected the macro definition so ${AUCTION_BID_ID} reads from this field.

Example

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

{
  "bidid": "resp-8f2a01"
}

Common mistakes

Putting the bidder's ID in BidResponse.id instead of here.

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 to 2.2	string	No	No
2.3 to 2.6-202606	string	No	No

Related fields

Other BidResponse fields

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