BidRequest.ext

Exchange-specific extensions to the bid request. The spec defines no members; Prebid Server, for example, reads its auction options from ext.prebid.

CurrentobjectOptionalSince 2.0

Field facts

Path: ext
Object: BidRequest
Type: object
Requirement: Optional
Added: OpenRTB 2.0
Spec section: 3.2.1

How it is used

Before 2.5 introduced the Source object, the SupplyChain specification placed the chain at ext.schain on the request. Whatever a partner needs from ext must be documented by the exchange, because the spec defines nothing there.

Example

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

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

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	object	No	No
2.3 to 2.6-202606	object	No	No

Other BidRequest fields

acat
allimps
app
at
badv
bapp
bcat
bseat
cattax
cur
device
dooh
id
imp
regs
site
source
test
tmax
user
wlang
wlangb
wseat

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