Send Universal IDs in bid requests for server-to-server integrations

Media Owners
Last Updated: April 30, 2026•

To send Universal IDsClosed Universal IDs are IDs that Index can receive from data partners and pass to DSPs in the bid request. in bid requests using a server-to-server integration, Media Owners must include the eIDs object in bid requests.

Before you begin: You must be integrated with at least one supported Universal ID provider.

  1. Update your integration to pass the eIDs object in the bid requestClosed An OpenRTB request that is sent from a supply-side platform (SSP) or ad exchange to the DSP requesting a bid response for potential impressions. A bid request contains information about the impression that allows the DSP to decide whether to bid on the impression.. For more information about the fields that you can pass with the eIDs object, see EID object.

  2. Confirm that you are correctly formatting the values for the source field (required) and rtipartner field within the eIDs Ext object (optional). For a list of values that corresponds to each Universal ID provider, refer to the following table:

    Universal ID providersource field (required)rtipartner field (optional)

    33Across

    33across.com

    33acrossId

    Amazon

    amazon.com

    amazonAdvertisingID

    Criteocriteo.comcriteoID

    LiveIntent

    liveintent.com

    nonID

    LiveRamp

    liveramp.com

    idl

    Merkle

    merkleinc.com

    MRKL

    netID

    netid.de

    NETID

    Neustar

    neustar.biz

    fabrickId

    Unified ID

    adserver.org

    TDID

    Unified ID 2.0

    uidapi.com

    UID2

    Yahoo ConnectID

    yahoo.com

    connectId

    For more information on how to format this object, refer to the following example that includes LiveRamp and Unified ID:

                                "eids": [
           {
               "source": "liveramp.com",
               "uids": [
                   {
                       "id": "AkrLD1kaph7_qsa2_lv42sZjg7K6AxQ7cf-4WH7IkBVvO59fkEyPnIeK2E9iZ0-weCY3bH00tdD3sRc-c6BHdN8M1Bw-Woosl3RUGEAfZFgUvbFLIz0pKSChoRNMbhY35Lk5",
                       "atype": 3
                   }
               ]
           },
           {
               "source": "adserver.org",
               "uids": [
                   {
                       "id": "1462147c-cce5-400f-8cd9-8b8351f39a98",
                       "atype": 1,
                       "ext": {
                           "rtiPartner": "TDID"
                       }
                   }
               ]
           },