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The AMX ID is a first-party identifier designed for publishers using the AMX RTB adapter. For more information please contact

AMX ID Configuration

First, add the AMX ID module to your Prebid.js build:

gulp build --modules=userId,amxIdSystem

Then configure the amxId in your userSync configuration:

    userSync: {
        userIds: [{
            name: 'amxId',
            storage: {
                name: 'amxId',
                type: 'html5',
                expires: 14,

This will add a userId.amxId property to all bidRequests:

  amxId: '3ca11058-ecbc-419f-bda7-b52fe7baf02a'

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