diff --git a/src/gatherers/webpagetest.js b/src/gatherers/webpagetest.js
index cc49722..d4f0936 100644
--- a/src/gatherers/webpagetest.js
+++ b/src/gatherers/webpagetest.js
@@ -180,6 +180,8 @@ class WebPageTestGatherer extends Gatherer {
       urlParams.push(key + '=' + params[key]);
     });
     let url = this.runApiEndpoint + '?' + urlParams.join('&');
+    options.headers = options.headers || {};
+    options.headers['X-WPT-API-KEY'] = this.apiKey;
 
     let response, body = {}, statusText;
     if (this.apiKey === 'TEST_APIKEY') {
@@ -193,7 +195,7 @@ class WebPageTestGatherer extends Gatherer {
 
     } else {
       if (this.debug) console.log('WPTGatherer::run\n', url);
-      response = this.apiHandler.fetch(url);
+      response = this.apiHandler.fetch(url, options);
 
       if (this.debug) {
         console.log('WPTGatherer::run API response: \n', response);
@@ -298,7 +300,7 @@ class WebPageTestGatherer extends Gatherer {
     let url = this.resultApiEndpoint + '?' + urlParams.join('&');
     if (this.debug) console.log('WPTGatherer::retrieve\n', url);
 
-    let response = this.apiHandler.fetch(url);
+    let response = this.apiHandler.fetch(url, options);
 
     if (response.statusCode >= 400) {
       return {
diff --git a/src/helpers/appscript-helper.js b/src/helpers/appscript-helper.js
index 5c3e235..8cac7e2 100644
--- a/src/helpers/appscript-helper.js
+++ b/src/helpers/appscript-helper.js
@@ -17,13 +17,13 @@
 const ApiHandler = require('./api-handler');
 
 class AppScriptApiHandler extends ApiHandler {
-  fetch(url) {
-    return this.get(url);
+  fetch(url, options) {
+    return this.get(url, options);
   }
 
-  get(url) {
+  get(url, options) {
     try {
-      var response = UrlFetchApp.fetch(url);
+      var response = UrlFetchApp.fetch(url, options);
       return {
         statusCode: response.getResponseCode(),
         body: response.getContentText(),