Geo.lastfix

How many seconds ago the location fix was taken, as an integer. Added in OpenRTB 2.4.

CurrentintegerOptionalSince 2.4

Field facts

Path: device.geo.lastfix, user.geo.lastfix
Object: Geo
Type: integer
Requirement: Optional
Added: OpenRTB 2.4
Spec section: 3.2.19

How it is used

Devices cache locations, so a request can carry coordinates that are minutes or hours old. Report the age of the actual fix, not the time the SDK last read its cache. Buyers doing proximity or store-visit targeting discount old fixes.

Example

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

{
  "id": "req-1",
  "device": {
    "geo": {
      "lastfix": 45
    }
  }
}

Common mistakes

Sending a Unix timestamp instead of an age in seconds.

Version history

Added in OpenRTB 2.4, 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
2.4	integer	No	No
2.5 to 2.6-202606	integer	No	No