diff --git a/lib/types/coder.js b/lib/types/coder.js
index 5573dba..e141bbf 100644
--- a/lib/types/coder.js
+++ b/lib/types/coder.js
@@ -31,6 +31,7 @@ var TypeString = require('./string');
 var TypeReal = require('./real');
 var TypeUReal = require('./ureal');
 var TypeBytes = require('./bytes');
+var sha3 = require('../utils/sha3')
 
 var isDynamic = function (Type, type) {
    return Type.isDynamicType(type) ||
@@ -72,8 +73,11 @@ Coder.prototype._requireType = function (type) {
  * @param {Object} plain param
  * @return {String} encoded plain param
  */
-Coder.prototype.encodeParam = function (type, param) {
-    return this.encodeParams([type], [param]);
+Coder.prototype.encodeParam = function (type, param, indexed=false) {
+    if(type === "string" && indexed) {
+        return sha3(param)
+    }
+    return this.encodeParams([type], [param], indexed);
 };
 
 /**
@@ -84,7 +88,7 @@ Coder.prototype.encodeParam = function (type, param) {
  * @param {Array} params
  * @return {String} encoded list of params
  */
-Coder.prototype.encodeParams = function (types, params) {
+Coder.prototype.encodeParams = function (types, params, indexed=false) {
     var Types = this.getTypes(types);
 
     var encodeds = Types.map(function (Type, index) {
@@ -187,8 +191,8 @@ Coder.prototype.encodeWithOffset = function (type, Type, encoded, offset) {
  * @param {String} bytes
  * @return {Object} plain param
  */
-Coder.prototype.decodeParam = function (type, bytes) {
-    return this.decodeParams([type], bytes)[0];
+Coder.prototype.decodeParam = function (type, bytes, indexed=false) {
+    return this.decodeParams([type], bytes, indexed)[0];
 };
 
 /**
@@ -204,7 +208,7 @@ Coder.prototype.decodeParams = function (types, bytes, indexed=false) {
     var offsets = this.getOffsets(types, Types);
 
     return Types.map(function (Type, index) {
-        return Type.decode(bytes, offsets[index],  types[index], indexed);
+        return Type.decode(bytes, offsets[index], types[index], indexed);
     });
 };
 
diff --git a/lib/types/formatters.js b/lib/types/formatters.js
index 80e6655..7e1aea3 100644
--- a/lib/types/formatters.js
+++ b/lib/types/formatters.js
@@ -218,7 +218,8 @@ var formatOutputDynamicBytes = function (param) {
  */
 var formatOutputString = function (param, name, indexed=false) {
     if(indexed) {
-        return utils.toUtf8(param.value)
+        // return utils.toUtf8(param.value)
+        return ""
     }
     var length = (new BigNumber(param.dynamicPart().slice(0, 64), 16)).toNumber() * 2;
     return utils.toUtf8(param.dynamicPart().substr(64, length));
diff --git a/lib/vnt/event.js b/lib/vnt/event.js
index 78b6a46..e7a5efc 100644
--- a/lib/vnt/event.js
+++ b/lib/vnt/event.js
@@ -119,10 +119,10 @@ Event.prototype.encode = function (indexed, options) {
 
         if (utils.isArray(value)) {
             return value.map(function (v) {
-                return '0x' + coder.encodeParam(i.type, v);
+                return '0x' + coder.encodeParam(i.type, v, true);
             });
         }
-        return '0x' + coder.encodeParam(i.type, value);
+        return '0x' + coder.encodeParam(i.type, value, true);
     });
 
     result.topics = result.topics.concat(indexedTopics);
@@ -177,9 +177,21 @@ Event.prototype.execute = function (indexed, options, callback) {
 
     if (utils.isFunction(arguments[arguments.length - 1])) {
         callback = arguments[arguments.length - 1];
-        if(arguments.length === 2)
+        if(arguments.length === 2){
+            options = arguments[0];
+            indxed = {}
+        } else if(arguments.length === 1) {
             options = null;
-        if(arguments.length === 1) {
+            indexed = {};
+        }
+    } else {
+        if(arguments.length === 2){
+            options = arguments[1];
+            indxed = arguments[0];
+        } else if(arguments.length === 1) {
+            options = arguments[0];
+            indexed = {};
+        } else {
             options = null;
             indexed = {};
         }