diff --git a/modules/nexx360BidAdapter.js b/modules/nexx360BidAdapter.js
index c31c3d81aeb..b4f7cf50ffe 100644
--- a/modules/nexx360BidAdapter.js
+++ b/modules/nexx360BidAdapter.js
@@ -22,7 +22,7 @@ const OUTSTREAM_RENDERER_URL = 'https://acdn.adnxs.com/video/outstream/ANOutstre
 const BIDDER_CODE = 'nexx360';
 const REQUEST_URL = 'https://fast.nexx360.io/booster';
 const PAGE_VIEW_ID = generateUUID();
-const BIDDER_VERSION = '4.0';
+const BIDDER_VERSION = '4.1';
 const GVLID = 965;
 const NEXXID_KEY = 'nexx360_storage';
 
@@ -69,6 +69,19 @@ function getAdContainer(container) {
   }
 }
 
+/**
+ * Get the AMX ID
+ * @return {string | false } false if localstorageNotEnabled
+ */
+export function getAmxId() {
+  if (!storage.localStorageIsEnabled()) {
+    logInfo(`localstorage not enabled for Nexx360`);
+    return false;
+  }
+  const amxId = storage.getDataFromLocalStorage('__amuidpb');
+  return amxId || false;
+}
+
 const converter = ortbConverter({
   context: {
     netRevenue: true, // or false if your adapter should set bidResponse.netRevenue = false
@@ -107,13 +120,30 @@ const converter = ortbConverter({
   request(buildRequest, imps, bidderRequest, context) {
     const request = buildRequest(imps, bidderRequest, context);
     const nexx360LocalStorage = getNexx360LocalStorage();
-    if (nexx360LocalStorage) deepSetValue(request, 'ext.nexx360Id', nexx360LocalStorage.nexx360Id);
+    if (nexx360LocalStorage) {
+      deepSetValue(request, 'ext.nexx360Id', nexx360LocalStorage.nexx360Id);
+      deepSetValue(request, 'ext.localStorage.nexx360Id', nexx360LocalStorage.nexx360Id);
+    }
+    const amxId = getAmxId();
+    if (amxId) deepSetValue(request, 'ext.localStorage.amxId', amxId());
     deepSetValue(request, 'ext.version', '$prebid.version$');
     deepSetValue(request, 'ext.source', 'prebid.js');
     deepSetValue(request, 'ext.pageViewId', PAGE_VIEW_ID);
     deepSetValue(request, 'ext.bidderVersion', BIDDER_VERSION);
     deepSetValue(request, 'cur', [config.getConfig('currency.adServerCurrency') || 'USD']);
-    if (!request.user) deepSetValue(request, 'user', {});
+    if (!request.user) request.user = {};
+    if (getAmxId()) {
+      if (!request.user.ext) request.user.ext = {};
+      if (!request.user.ext.eids) request.user.ext.eids = [];
+      request.user.ext.eids.push({
+        source: 'amxdt.net',
+        uids: [{
+          id: `${getAmxId()}`,
+          atype: 1
+        }]
+      });
+    }
+
     return request;
   },
 });
diff --git a/test/spec/modules/nexx360BidAdapter_spec.js b/test/spec/modules/nexx360BidAdapter_spec.js
index f18e0365226..06cbec347ff 100644
--- a/test/spec/modules/nexx360BidAdapter_spec.js
+++ b/test/spec/modules/nexx360BidAdapter_spec.js
@@ -3,6 +3,7 @@ import {
   spec, storage, getNexx360LocalStorage,
 } from 'modules/nexx360BidAdapter.js';
 import { sandbox } from 'sinon';
+import { getAmxId } from '../../../modules/nexx360BidAdapter';
 
 const instreamResponse = {
   'id': '2be64380-ba0c-405a-ab53-51f51c7bde51',
@@ -220,7 +221,7 @@ describe('Nexx360 bid adapter tests', function () {
     after(function () {
       sandbox.restore()
     });
-  })
+  });
 
   describe('getNexx360LocalStorage enabled', function () {
     before(function () {
@@ -235,7 +236,37 @@ describe('Nexx360 bid adapter tests', function () {
     after(function () {
       sandbox.restore()
     });
-  })
+  });
+
+  describe('getAmxId() with localStorage enabled and data not set', function() {
+    before(function () {
+      sandbox.stub(storage, 'localStorageIsEnabled').callsFake(() => true);
+      sandbox.stub(storage, 'setDataInLocalStorage');
+      sandbox.stub(storage, 'getDataFromLocalStorage').callsFake((key) => null);
+    });
+    it('We test if we get the amxId', function() {
+      const output = getAmxId();
+      expect(output).to.be.eql(false);
+    });
+    after(function () {
+      sandbox.restore()
+    });
+  });
+
+  describe('getAmxId() with localStorage enabled and data set', function() {
+    before(function () {
+      sandbox.stub(storage, 'localStorageIsEnabled').callsFake(() => true);
+      sandbox.stub(storage, 'setDataInLocalStorage');
+      sandbox.stub(storage, 'getDataFromLocalStorage').callsFake((key) => 'abcdef');
+    });
+    it('We test if we get the amxId', function() {
+      const output = getAmxId();
+      expect(output).to.be.eql('abcdef');
+    });
+    after(function () {
+      sandbox.restore()
+    });
+  });
 
   describe('buildRequests()', function() {
     before(function () {
@@ -374,7 +405,7 @@ describe('Nexx360 bid adapter tests', function () {
         expect(requestContent.imp[1].tagid).to.be.eql('div-2-abcd');
         expect(requestContent.imp[1].ext.adUnitCode).to.be.eql('div-2-abcd');
         expect(requestContent.imp[1].ext.divId).to.be.eql('div-2-abcd');
-        expect(requestContent.ext.bidderVersion).to.be.eql('4.0');
+        expect(requestContent.ext.bidderVersion).to.be.eql('4.1');
         expect(requestContent.ext.source).to.be.eql('prebid.js');
       });