diff --git a/lib/postgres/index.js b/lib/postgres/index.js
index bec77e0..81f1d92 100644
--- a/lib/postgres/index.js
+++ b/lib/postgres/index.js
@@ -51,15 +51,6 @@ module.exports = async(config) => {
         }
     }
 
-    const types = (() => {
-        let cache;
-        return async() => {
-            if (!cache) {
-                cache = (await predefinedQuery('types')).rows;
-            }
-            return cache;
-        };
-    })();
     // https://www.postgresql.org/docs/current/catalog-pg-proc.html
     const buildArgs = (argnames, argmodesText) => {
         if (!argmodesText && !argnames) {
@@ -81,9 +72,14 @@ module.exports = async(config) => {
                 };
             }, {input: [], other: [], all: []});
     };
-
+    const defaultValue = (raw) => {
+        // for now only 1 def val are cough
+        if (raw.startsWith('NULL')) {
+            return null;
+        }
+        return undefined;
+    };
     const build = async() => {
-        const allTypes = await types();
         const methods = (await predefinedQuery('methods'));
         return methods
             .filter(({schema}) => schemas.indexOf(schema) > -1)
@@ -96,13 +92,20 @@ module.exports = async(config) => {
                 inargtypes, // An array of the data types of the function arguments. This includes only input arguments (including INOUT and VARIADIC arguments), and thus represents the call signature of the function.
                 allargtypes, // An array of the data types of the function arguments. This includes all arguments (including OUT and INOUT arguments); however, if all the arguments are IN arguments, this field will be null. Note that subscripting is 1-based, whereas for historical reasons proargtypes is subscripted from 0.
                 argnames, // An array of the names of the function arguments. Arguments without a name are set to empty strings in the array. If none of the arguments have a name, this field will be null. Note that subscripts correspond to positions of proallargtypes not proargtypes.
-                argmodes // An array of the modes of the function arguments, encoded as i for IN arguments, o for OUT arguments, b for INOUT arguments, v for VARIADIC arguments, t for TABLE arguments. If all the arguments are IN arguments, this field will be null. Note that subscripts correspond to positions of proallargtypes not proargtypes.
+                argmodes, // An array of the modes of the function arguments, encoded as i for IN arguments, o for OUT arguments, b for INOUT arguments, v for VARIADIC arguments, t for TABLE arguments. If all the arguments are IN arguments, this field will be null. Note that subscripts correspond to positions of proallargtypes not proargtypes.
+                optargnames,
+                optargdefaults
             }) => {
                 const jsName = [schema, name].join(gluePrefix);
                 const sqlName = [`"${schema}"`, `"${name}"`].join('.');
                 const args = buildArgs(argnames, argmodes);
                 const fillArgs = args.input
                     .map((v, idx) => `$${idx + 1}`).join(',');
+                const oArgDefaults = (optargdefaults?.split(', ') || []);
+                const oArgNames = optargnames?.reduce(
+                    (a, arg, idx) => ({...a, [arg]: defaultValue(oArgDefaults[idx])}),
+                    {}
+                ) || {};
                 return {
                     ...methods,
                     /**
@@ -114,6 +117,9 @@ module.exports = async(config) => {
                     [jsName]: async(arguments, txId) => {
                         const dynArgs = args.input.map(({name}) => {
                             if (arguments[name] === undefined) {
+                                if (oArgNames[name]!==undefined) {
+                                    return oArgNames[name];
+                                }
                                 throw SqlSe.create(
                                     'argumentNotFound',
                                     {fn: jsName, argument: name}
diff --git a/lib/postgres/sqls/methods.sql b/lib/postgres/sqls/methods.sql
index 0270e5d..219e518 100644
--- a/lib/postgres/sqls/methods.sql
+++ b/lib/postgres/sqls/methods.sql
@@ -1,18 +1,19 @@
 SELECT
     nspname "schema",
-	proname "name",
-	pronargs ninargs,
+    proname "name",
+    pronargs ninargs,
     pronargdefaults nargdefaults,
     prorettype rettype,
     proargtypes inargtypes,
     proallargtypes allargtypes,
     proargnames argnames,
-    proargmodes argmodes
+    proargmodes argmodes,
+    p.proargnames[pronargs-pronargdefaults+1:pronargs] optargnames,
+    pg_get_expr(p.proargdefaults, 0) optargdefaults
 FROM 
     pg_catalog.pg_namespace n
 JOIN 
     pg_catalog.pg_proc p ON 
     p.pronamespace = n.oid
 WHERE 
-	nspname  not IN ('pg_catalog', 'information_schema')
-
+    nspname  not IN ('pg_catalog', 'information_schema')