diff --git a/modules/renderer/background.js b/modules/renderer/background.js
index d1bd4722e..67b4034e2 100644
--- a/modules/renderer/background.js
+++ b/modules/renderer/background.js
@@ -8,9 +8,7 @@ import whichPolygon from 'which-polygon';
 import { geoExtent, geoMetersToOffset, geoOffsetToMeters} from '../geo';
 import { rendererBackgroundSource } from './background_source';
 import { rendererTileLayer } from './tile_layer';
-import { utilQsString, utilStringQs } from '../util';
-import { utilDetect } from '../util/detect';
-import { utilRebind } from '../util/rebind';
+import { utilAesDecrypt, utilDetect, utilQsString, utilStringQs, utilRebind } from '../util';
 
 
 let _imageryIndex = null;
@@ -589,6 +587,11 @@ function preprocessSources(sources) {
     'EPSG:3785': true
   };
 
+  const apikeys = {
+    'Maxar-Premium': '2ac35d3bc99b64243066ef6888846358386da6cadbe0de9dbaf6ce8c17dae8d532d0d46f',
+    'Maxar-Standard': '7bc70b61c29b34243064bd6f818463583262a6ca8ae78b9db9a4cf8b46d9ed8261d08168'
+  };
+
 
   let keepImagery = [];
   sources.forEach(source => {
@@ -603,13 +606,9 @@ function preprocessSources(sources) {
       locationSet: source.locationSet
     };
 
-    // Maxar sources
-    if (source.id === 'Maxar-Premium') {
-      im.template = '7586487389962e3f6e31ab2ed8ca321f2f3fe2cf87f1dedce8fc918b4692efd86fcd816ab8a35303effb1be9abe39b1cce3fe6db2c740044364ae68560822c88373d2c784325baf4e1fa007c6dbedab4cea3fa0dd86ee0ae4feeef032d33dcac28e4b16c90d55a42087c6b66526423ea1b4cc7e63c613940eb1c60f48270060bf41c5fcb6a628985ebe6801e9e71f041cc9f8df06b0345600376663e7dc1cdbc7df16876d8b5d006ed5782e6af4bfe2ff5a292';
-      im.encrypted = true;
-    } else if (source.id === 'Maxar-Standard') {
-      im.template = '7586487389962e3f6e31ab2ed8ca321f2f3fe2cf87f1dedce8fc918b4692efd86fcd816ab8a35303effb1be9abe39b1cce3fe6db2c740044364ae68560822c88373d2c784325baf4e1fa007c6dbedab4cea3fa0dd86ee0ae4feeef032d33dcac28e4b16c90d55a42087c6b66526423ea1b4cc7e63c613940eb1c60f48270060bf41c5fcb6a628985ebe6801e9e71f010c8c9d7fb6b534560012461377dc1cdb672f16827dfe0d005bf5685b7ac4ea97cf5f795';
-      im.encrypted = true;
+    // decrypt api keys
+    if (apikeys[source.id]) {
+      im.apikey = utilAesDecrypt(apikeys[source.id]);
     }
 
     // A few sources support 512px tiles
diff --git a/modules/renderer/background_source.js b/modules/renderer/background_source.js
index 581f52493..aa93a6f18 100644
--- a/modules/renderer/background_source.js
+++ b/modules/renderer/background_source.js
@@ -3,7 +3,6 @@ import { json as d3_json } from 'd3-fetch';
 
 import { t } from '../util/locale';
 import { geoExtent, geoSphericalDistance } from '../geo';
-import { utilAesDecrypt } from '../util/aes';
 import { utilDetect } from '../util/detect';
 
 
@@ -34,7 +33,7 @@ export function rendererBackgroundSource(data) {
     var name = source.name;
     var description = source.description;
     var best = !!source.best;
-    var template = source.encrypted ? utilAesDecrypt(source.template) : source.template;
+    var template = source.template;
 
     source.tileSize = data.tileSize || 256;
     source.zoomExtent = data.zoomExtent || [0, 22];
@@ -81,14 +80,16 @@ export function rendererBackgroundSource(data) {
     };
 
 
-    source.template = function(_) {
+    source.template = function(val) {
         if (!arguments.length) return template;
-        if (source.id === 'custom') template = _;
+        if (source.id === 'custom') template = val;
         return source;
     };
 
 
     source.url = function(coord) {
+        var result = template;
+
         if (this.type === 'wms') {
             var tileToProjectedCoords = (function(x, y, z) {
                 //polyfill for IE11, PhantomJS
@@ -120,7 +121,8 @@ export function rendererBackgroundSource(data) {
             var projection = this.projection;
             var minXmaxY = tileToProjectedCoords(coord[0], coord[1], coord[2]);
             var maxXminY = tileToProjectedCoords(coord[0]+1, coord[1]+1, coord[2]);
-            return template.replace(/\{(\w+)\}/g, function (token, key) {
+
+            result = result.replace(/\{(\w+)\}/g, function (token, key) {
               switch (key) {
                 case 'width':
                 case 'height':
@@ -143,28 +145,40 @@ export function rendererBackgroundSource(data) {
                   return token;
               }
             });
+
+        } else if (this.type === 'tms') {
+            result = result
+                .replace('{x}', coord[0])
+                .replace('{y}', coord[1])
+                // TMS-flipped y coordinate
+                .replace(/\{[t-]y\}/, Math.pow(2, coord[2]) - coord[1] - 1)
+                .replace(/\{z(oom)?\}/, coord[2]);
+
+        } else if (this.type === 'bing') {
+            result = result
+                .replace('{u}', function() {
+                    var u = '';
+                    for (var zoom = coord[2]; zoom > 0; zoom--) {
+                        var b = 0;
+                        var mask = 1 << (zoom - 1);
+                        if ((coord[0] & mask) !== 0) b++;
+                        if ((coord[1] & mask) !== 0) b += 2;
+                        u += b.toString();
+                    }
+                    return u;
+                });
+
         }
-        return template
-            .replace('{x}', coord[0])
-            .replace('{y}', coord[1])
-            // TMS-flipped y coordinate
-            .replace(/\{[t-]y\}/, Math.pow(2, coord[2]) - coord[1] - 1)
-            .replace(/\{z(oom)?\}/, coord[2])
+
+        result = result
+            .replace('{apikey}', (this.apikey || ''))
             .replace(/\{switch:([^}]+)\}/, function(s, r) {
                 var subdomains = r.split(',');
                 return subdomains[(coord[0] + coord[1]) % subdomains.length];
-            })
-            .replace('{u}', function() {
-                var u = '';
-                for (var zoom = coord[2]; zoom > 0; zoom--) {
-                    var b = 0;
-                    var mask = 1 << (zoom - 1);
-                    if ((coord[0] & mask) !== 0) b++;
-                    if ((coord[1] & mask) !== 0) b += 2;
-                    u += b.toString();
-                }
-                return u;
             });
+
+
+        return result;
     };