diff --git a/src/postgrest.js b/src/postgrest.js
index 809bf48..58e4432 100644
--- a/src/postgrest.js
+++ b/src/postgrest.js
@@ -1,5 +1,3 @@
-/* api wrapper */
-
 // utilities
 // generate downloadable csv
 const download = (options={}) => {
@@ -109,8 +107,21 @@ const _make_api = (api_root, need_auth=true) => {
 
 		// expose authentication module
 		auth: _auth,
+	}
+}
 
-		// wrap m.request with authentication validation
+/* api wrapper */
+/*
+ * api.request(options): all options will be forwarded to m.request, except a
+ * few:
+ *
+ * 1. options.queries: an array of object '{label: <>, value: <>, op: <>}' to
+ * build postgrest query easily
+ */
+
+export default (api_root, auth={}) => {
+	return {
+		// wrap m.request with authentication validation if demanded
 		request: (options = {}) => {
 			/* normalize arguments */
 			if (typeof options === 'string') {
@@ -119,11 +130,11 @@ const _make_api = (api_root, need_auth=true) => {
 
 			/* normalize url */
 			if (options.url.startsWith('/'))
-				options.url = _root + options.url
+				options.url = api_root + options.url
 
 			/* normalize headers */
 			// 1. check if auth is required
-			if (need_auth) {
+			if (false/*need_auth*/) {
 				// insert auth header if availible
 				if (_auth.token()) {
 					options.headers = {
@@ -193,5 +204,3 @@ const _make_api = (api_root, need_auth=true) => {
 		}
 	}
 }
-
-export default _make_api('https://api-dev.uidt.net/phanerozoic/v1', false)