diff --git a/lib/cartodb/controllers/named_maps.js b/lib/cartodb/controllers/named_maps.js
index 686be507..b93517a7 100644
--- a/lib/cartodb/controllers/named_maps.js
+++ b/lib/cartodb/controllers/named_maps.js
@@ -6,11 +6,14 @@ var NamedMapsCacheEntry = require('../cache/model/named_maps_entry');
 var cors = require('../middleware/cors');
 
 var MapStoreMapConfigProvider = require('windshaft').model.provider.MapStoreMapConfig;
+var NamedMapMapConfigProvider = require('../models/mapconfig/named_map_provider');
 
-function NamedMapsController(app, mapStore, templateMaps, metadataBackend, mapBackend, tileBackend, previewBackend,
-                             templateBaseUrl, surrogateKeysCache, layergroupRequestDecorator, tablesExtentApi) {
+function NamedMapsController(app, pgConnection, mapStore, templateMaps, metadataBackend, mapBackend, tileBackend,
+                             previewBackend, templateBaseUrl, surrogateKeysCache, layergroupRequestDecorator,
+                             tablesExtentApi) {
     this.app = app;
     this.mapStore = mapStore;
+    this.pgConnection = pgConnection;
     this.templateMaps = templateMaps;
     this.metadataBackend = metadataBackend;
     this.mapBackend = mapBackend;
@@ -398,76 +401,34 @@ NamedMapsController.prototype.instantiateTemplate = function(req, res, template_
         }
     };
 
-    var template;
-    var layergroup;
     var cdbuser = req.context.user;
-    var params = {
-        user: req.params.user
-    };
-    // Format of template_id: [<template_owner>]@<template_id>
-    var tpl_id = templateName(req.params.template_id);
-    var auth_token = req.query.auth_token;
+    var mapConfigProvider = new NamedMapMapConfigProvider(
+        this.templateMaps,
+        this.pgConnection,
+        cdbuser,
+        req.params.template_id,
+        template_params,
+        req.query.auth_token,
+        req.params
+    );
+
     step(
         function getTemplate(){
-            self.templateMaps.getTemplate(cdbuser, tpl_id, this);
+            mapConfigProvider.getMapConfig(this);
         },
-        function checkAuthorized(err, templateValue) {
-            if ( req.profiler ) req.profiler.done('getTemplate');
-            if ( err ) throw err;
-            if ( ! templateValue ) {
-                err = new Error("Template '" + tpl_id + "' of user '" + cdbuser + "' not found");
-                err.http_status = 404;
-                throw err;
-            }
-
-            template = templateValue;
-
-            var authorized = false;
-            try {
-                authorized = self.templateMaps.isAuthorized(template, auth_token);
-            } catch (err) {
-                // we catch to add http_status
-                err.http_status = 403;
-                throw err;
-            }
-            if ( ! authorized ) {
-                err = new Error('Unauthorized template instantiation');
-                err.http_status = 403;
-                throw err;
-            }
-
-            if (req.profiler) {
-                req.profiler.done('authorizedByCert');
-            }
-
-            return self.templateMaps.instance(template, template_params);
-        },
-        function prepareParams(err, instance){
-            if ( req.profiler ) req.profiler.done('TemplateMaps_instance');
-            if ( err ) throw err;
-            layergroup = instance;
-            self.app.setDBParams(cdbuser, params, this);
-        },
-        function setApiKey(err){
-            if ( req.profiler ) req.profiler.done('setDBParams');
-            if ( err ) throw err;
-            self.metadataBackend.getUserMapKey(cdbuser, this);
-        },
-        function createLayergroup(err, val) {
-            if ( req.profiler ) req.profiler.done('getUserMapKey');
-            if ( err ) throw err;
-            params.api_key = val;
-            self.mapBackend.createLayergroup(layergroup, params, layergroupDecorator, this);
+        function createLayergroup(err, mapConfig, rendererParams/*, context*/) {
+            assert.ifError(err);
+            self.mapBackend.createLayergroup(mapConfig, rendererParams, layergroupDecorator, this);
         },
         function prepareResponse(err, layergroup) {
-            if ( err ) {
+            if (err) {
                 return callback(err, { errors: [''+err] });
             }
-            var tplhash = self.templateMaps.fingerPrint(template).substring(0,8);
-            layergroup.layergroupid = cdbuser + '@' + tplhash + '@' + layergroup.layergroupid;
+            var templateHash = self.templateMaps.fingerPrint(mapConfigProvider.template).substring(0,8);
+            layergroup.layergroupid = cdbuser + '@' + templateHash + '@' + layergroup.layergroupid;
             res.header('X-Layergroup-Id', layergroup.layergroupid);
 
-            self.surrogateKeysCache.tag(res, new NamedMapsCacheEntry(cdbuser, template.name));
+            self.surrogateKeysCache.tag(res, new NamedMapsCacheEntry(cdbuser, mapConfigProvider.template.name));
 
             callback(null, layergroup);
         }
diff --git a/lib/cartodb/models/mapconfig/named_map_provider.js b/lib/cartodb/models/mapconfig/named_map_provider.js
new file mode 100644
index 00000000..7abfa2b3
--- /dev/null
+++ b/lib/cartodb/models/mapconfig/named_map_provider.js
@@ -0,0 +1,154 @@
+var _ = require('underscore');
+var assert = require('assert');
+var step = require('step');
+var templateName = require('../../backends/template_maps').templateName;
+
+function NamedMapMapConfigProvider(templateMaps, pgConnection, owner, templateId, config, authToken, params) {
+    this.templateMaps = templateMaps;
+    this.pgConnection = pgConnection;
+    this.owner = owner;
+    this.templateId = templateId;
+    this.config = config;
+    this.authToken = authToken;
+    this.params = params;
+
+    // use template after call to mapConfig
+    this.template = null;
+
+    // providing
+    this.err = null;
+    this.mapConfig = null;
+    this.rendererParams = null;
+    this.context = null;
+}
+
+module.exports = NamedMapMapConfigProvider;
+
+NamedMapMapConfigProvider.prototype.getMapConfig = function(callback) {
+    if (this.err !== null || this.mapConfig !== null) {
+        return callback(this.err, this.mapConfig, this.rendererParams, this.context);
+    }
+
+    var self = this;
+
+    var mapConfig;
+    var rendererParams;
+    var context = {};
+
+    step(
+        function getTemplate(err) {
+            assert.ifError(err);
+            self.templateMaps.getTemplate(self.owner, templateName(self.templateId), this);
+        },
+        function checkExists(err, tpl) {
+            assert.ifError(err);
+            if (!tpl) {
+                var notFoundErr = new Error(
+                    "Template '" + templateName(self.templateId) + "' of user '" + self.owner + "' not found"
+                );
+                notFoundErr.http_status = 404;
+                throw notFoundErr;
+            }
+            return tpl;
+        },
+        function checkAuthorized(err, tpl) {
+            assert.ifError(err);
+
+            var authorized = false;
+            try {
+                authorized = self.templateMaps.isAuthorized(tpl, self.authToken);
+            } catch (err) {
+                // we catch to add http_status
+                var authorizationFailedErr = new Error('Failed to authorize template');
+                authorizationFailedErr.http_status = 403;
+                throw authorizationFailedErr;
+            }
+            if ( ! authorized ) {
+                var unauthorizedErr = new Error('Unauthorized template instantiation');
+                unauthorizedErr.http_status = 403;
+                throw unauthorizedErr;
+            }
+
+            return tpl;
+        },
+        function prepareParams(err, tpl) {
+            assert.ifError(err);
+
+            self.template = tpl;
+
+            var templateParams = {};
+            if (self.config) {
+                try {
+                    templateParams = _.isString(self.config) ? JSON.parse(self.config) : self.config;
+                } catch (e) {
+                    throw new Error('malformed config parameter, should be a valid JSON');
+                }
+            }
+
+            return templateParams;
+        },
+        function instantiateTemplate(err, templateParams) {
+            assert.ifError(err);
+            return self.templateMaps.instance(self.template, templateParams);
+        },
+        function prepareLayergroup(err, layergroup) {
+            assert.ifError(err);
+            mapConfig = layergroup;
+            rendererParams = _.extend({}, self.params, {
+                user: self.owner
+            });
+            self.setDBParams(self.owner, rendererParams, this);
+        },
+        function cacheAndReturnMapConfig(err) {
+            self.err = err;
+            self.mapConfig = mapConfig;
+            self.rendererParams = rendererParams;
+            self.context = context;
+            return callback(self.err, self.mapConfig, self.rendererParams, self.context);
+        }
+    );
+};
+
+NamedMapMapConfigProvider.prototype.getKey = function() {
+    return createKey(this.params);
+};
+
+NamedMapMapConfigProvider.prototype.getCacheBuster = function() {
+    return 0;
+};
+
+NamedMapMapConfigProvider.prototype.filter = function(key) {
+    var regex = new RegExp('^' + createKey(this.params, true) + '.*');
+    return key && key.match(regex);
+};
+
+// Configure bases for cache keys suitable for string interpolation
+var baseKey   = '<%= dbname %>:<%= owner %>:<%= templateName %>';
+var renderKey = baseKey + ':<%= authToken %>:<%= configHash %>:<%= layer %>:<%= scale_factor %>';
+// Create a string ID/key from a set of params
+function createKey(params, base) {
+    return _.template(base ? baseKey : renderKey, _.defaults({}, params, {
+        dbname: '',
+        owner: '',
+        templateName: '',
+        authToken: '',
+        configHash: '',
+        scale_factor: 1
+    }));
+}
+
+NamedMapMapConfigProvider.prototype.setDBParams = function(cdbuser, params, callback) {
+    var self = this;
+    step(
+        function setAuth() {
+            self.pgConnection.setDBAuth(cdbuser, params, this);
+        },
+        function setConn(err) {
+            if ( err ) throw err;
+            self.pgConnection.setDBConn(cdbuser, params, this);
+        },
+        function finish(err) {
+            callback(err);
+        }
+    );
+};
\ No newline at end of file
diff --git a/lib/cartodb/server.js b/lib/cartodb/server.js
index bba292af..aa55f39a 100644
--- a/lib/cartodb/server.js
+++ b/lib/cartodb/server.js
@@ -321,6 +321,7 @@ module.exports = function(serverOptions) {
 
     new controller.NamedMaps(
         app,
+        pgConnection,
         mapStore,
         templateMaps,
         metadataBackend,