Source.ext

Exchange-specific extensions to the Source object. On OpenRTB 2.5 traffic it is where the supply chain usually travels, as source.ext.schain, because the core Source.schain field only arrived in 2.6.

CurrentobjectOptionalSince 2.5

Field facts

Path: source.ext
Object: Source
Type: object
Requirement: Optional
Added: OpenRTB 2.5
Spec section: 3.2.2

Example

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

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

Common mistakes

Keeping a stale source.ext.schain next to source.schain after a 2.6 migration leaves buyers to guess which chain is current.

Version history

Added in OpenRTB 2.5, 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
2.5 to 2.6-202606	object	No	No

Related fields

Source.schain

Other Source fields

fd
pchain
schain
tid

For a walkthrough of the whole object, read Supply chain (schain).