diff --git a/oauth3.core.js b/oauth3.core.js
index 73015a2..e5a7dbb 100644
--- a/oauth3.core.js
+++ b/oauth3.core.js
@@ -969,7 +969,7 @@
     }
   , api: function (providerUri, opts) {
       if (!OAUTH3.api[opts.api]) {
-        throw new Error("No API for '" + providerUri + "'");
+        return OAUTH3.PromiseA.reject(new Error("No API for '" + providerUri + "'"));
       }
 
       return OAUTH3.api[opts.api](providerUri, opts);
@@ -1073,7 +1073,7 @@
         opts = opts || {};
         opts.api = api;
         opts.session = OAUTH3.hooks.session._getCached(this._providerUri);
-        OAUTH3.api(this._providerUri, opts);
+        return OAUTH3.api(this._providerUri, opts);
       }
     };
     result.authenticate = result.login;