diff --git a/modules/gridBidAdapter.js b/modules/gridBidAdapter.js
index ac9a7d30429..57ab4ff4ed9 100644
--- a/modules/gridBidAdapter.js
+++ b/modules/gridBidAdapter.js
@@ -5,9 +5,12 @@ import { VIDEO, BANNER } from '../src/mediaTypes';
 
 const BIDDER_CODE = 'grid';
 const ENDPOINT_URL = '//grid.bidswitch.net/hb';
+const SYNC_URL = '//x.bidswitch.net/sync?ssp=iow_labs';
 const TIME_TO_LIVE = 360;
 const RENDERER_URL = '//acdn.adnxs.com/video/outstream/ANOutstreamVideo.js';
 
+let hasSynced = false;
+
 const LOG_ERROR_MESS = {
   noAuid: 'Bid from response has no auid parameter - ',
   noAdm: 'Bid from response has no adm parameter - ',
@@ -136,6 +139,25 @@ export const spec = {
     }
     if (errorMessage) utils.logError(errorMessage);
     return bidResponses;
+  },
+  getUserSyncs: function (syncOptions, responses, gdprConsent) {
+    if (!hasSynced && syncOptions.pixelEnabled) {
+      let params = '';
+
+      if (gdprConsent && typeof gdprConsent.consentString === 'string') {
+        if (typeof gdprConsent.gdprApplies === 'boolean') {
+          params += `&gdpr=${Number(gdprConsent.gdprApplies)}&gdpr_consent=${gdprConsent.consentString}`;
+        } else {
+          params += `&gdpr_consent=${gdprConsent.consentString}`;
+        }
+      }
+
+      hasSynced = true;
+      return {
+        type: 'image',
+        url: SYNC_URL + params
+      };
+    }
   }
 };
 
@@ -244,4 +266,12 @@ function createRenderer (bid, rendererParams) {
   return renderer;
 }
 
+export function resetUserSync() {
+  hasSynced = false;
+}
+
+export function getSyncUrl() {
+  return SYNC_URL;
+}
+
 registerBidder(spec);
diff --git a/test/spec/modules/gridBidAdapter_spec.js b/test/spec/modules/gridBidAdapter_spec.js
index 36aaddb8b42..d972ec25c8a 100644
--- a/test/spec/modules/gridBidAdapter_spec.js
+++ b/test/spec/modules/gridBidAdapter_spec.js
@@ -1,5 +1,5 @@
 import { expect } from 'chai';
-import { spec } from 'modules/gridBidAdapter';
+import { spec, resetUserSync, getSyncUrl } from 'modules/gridBidAdapter';
 import { newBidder } from 'src/adapters/bidderFactory';
 
 describe('TheMediaGrid Adapter', function () {
@@ -577,4 +577,91 @@ describe('TheMediaGrid Adapter', function () {
       expect(result).to.deep.equal(expectedResponse);
     });
   });
+
+  describe('user sync', function () {
+    const syncUrl = getSyncUrl();
+
+    beforeEach(function () {
+      resetUserSync();
+    });
+
+    it('should register the Emily iframe', function () {
+      let syncs = spec.getUserSyncs({
+        pixelEnabled: true
+      });
+
+      expect(syncs).to.deep.equal({type: 'image', url: syncUrl});
+    });
+
+    it('should not register the Emily iframe more than once', function () {
+      let syncs = spec.getUserSyncs({
+        pixelEnabled: true
+      });
+      expect(syncs).to.deep.equal({type: 'image', url: syncUrl});
+
+      // when called again, should still have only been called once
+      syncs = spec.getUserSyncs();
+      expect(syncs).to.equal(undefined);
+    });
+
+    it('should pass gdpr params if consent is true', function () {
+      expect(spec.getUserSyncs({ pixelEnabled: true }, {}, {
+        gdprApplies: true, consentString: 'foo'
+      })).to.deep.equal({
+        type: 'image', url: `${syncUrl}&gdpr=1&gdpr_consent=foo`
+      });
+    });
+
+    it('should pass gdpr params if consent is false', function () {
+      expect(spec.getUserSyncs({ pixelEnabled: true }, {}, {
+        gdprApplies: false, consentString: 'foo'
+      })).to.deep.equal({
+        type: 'image', url: `${syncUrl}&gdpr=0&gdpr_consent=foo`
+      });
+    });
+
+    it('should pass gdpr param gdpr_consent only when gdprApplies is undefined', function () {
+      expect(spec.getUserSyncs({ pixelEnabled: true }, {}, {
+        consentString: 'foo'
+      })).to.deep.equal({
+        type: 'image', url: `${syncUrl}&gdpr_consent=foo`
+      });
+    });
+
+    it('should pass no params if gdpr consentString is not defined', function () {
+      expect(spec.getUserSyncs({ pixelEnabled: true }, {}, {})).to.deep.equal({
+        type: 'image', url: syncUrl
+      });
+    });
+
+    it('should pass no params if gdpr consentString is a number', function () {
+      expect(spec.getUserSyncs({ pixelEnabled: true }, {}, {
+        consentString: 0
+      })).to.deep.equal({
+        type: 'image', url: syncUrl
+      });
+    });
+
+    it('should pass no params if gdpr consentString is null', function () {
+      expect(spec.getUserSyncs({ pixelEnabled: true }, {}, {
+        consentString: null
+      })).to.deep.equal({
+        type: 'image', url: syncUrl
+      });
+    });
+
+    it('should pass no params if gdpr consentString is a object', function () {
+      expect(spec.getUserSyncs({ pixelEnabled: true }, {}, {
+        consentString: {}
+      })).to.deep.equal({
+        type: 'image', url: syncUrl
+      });
+    });
+
+    it('should pass no params if gdpr is not defined', function () {
+      expect(spec.getUserSyncs({ pixelEnabled: true }, {}, undefined)).to.deep.equal({
+        type: 'image', url: syncUrl
+      });
+    });
+  });
 });