diff --git a/remix-debug/index.js b/remix-debug/index.js
index a5e3ac4f80..9f7b93d27d 100644
--- a/remix-debug/index.js
+++ b/remix-debug/index.js
@@ -30,6 +30,7 @@ module.exports = {
   storage: {
     StorageViewer: StorageViewer,
     StorageResolver: StorageResolver
-  }
+  },
+  SolidityDecoder: SolidityDecoder
 }
 
diff --git a/remix-simulator/README.md b/remix-simulator/README.md
new file mode 100644
index 0000000000..ea0ecbddb0
--- /dev/null
+++ b/remix-simulator/README.md
@@ -0,0 +1,2 @@
+# `remix-simulator`
+
diff --git a/remix-simulator/bin/ethsim b/remix-simulator/bin/ethsim
new file mode 100755
index 0000000000..e136cc361f
--- /dev/null
+++ b/remix-simulator/bin/ethsim
@@ -0,0 +1,4 @@
+#!/usr/bin/env node
+
+require('../src/server');
+
diff --git a/remix-simulator/index.js b/remix-simulator/index.js
new file mode 100644
index 0000000000..4b17d07532
--- /dev/null
+++ b/remix-simulator/index.js
@@ -0,0 +1,5 @@
+var Provider = require('./src/provider')
+
+module.exports = {
+  Provider: Provider
+}
diff --git a/remix-simulator/package.json b/remix-simulator/package.json
new file mode 100644
index 0000000000..e3d2116695
--- /dev/null
+++ b/remix-simulator/package.json
@@ -0,0 +1,86 @@
+{
+  "name": "remix-simulator",
+  "version": "0.0.3",
+  "description": "Ethereum IDE and tools for the web",
+  "contributors": [
+    {
+      "name": "Iuri Matias",
+      "email": "iuri@ethereum.org"
+    },
+    {
+      "name": "Yann Levreau",
+      "email": "yann@ethdev.com"
+    }
+  ],
+  "main": "./index.js",
+  "dependencies": {
+    "ansi-gray": "^0.1.1",
+    "babel-plugin-transform-object-assign": "^6.22.0",
+    "babel-preset-es2017": "^6.24.1",
+    "babelify": "^7.3.0",
+    "body-parser": "^1.18.2",
+    "color-support": "^1.1.3",
+    "express": "^4.16.3",
+    "fast-async": "^6.3.7",
+    "merge": "^1.2.0",
+    "remix-lib": "^0.2.5",
+    "standard": "^10.0.3",
+    "time-stamp": "^2.0.0",
+    "web3": "1.0.0-beta.27"
+  },
+  "scripts": {
+    "test": "standard"
+  },
+  "bin": {
+    "ethsim": "./bin/ethsim",
+    "remix-simulator": "./bin/ethsim"
+  },
+  "standard": {
+    "ignore": [
+      "node_modules/*"
+    ],
+    "parser": "babel-eslint"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/ethereum/remix.git"
+  },
+  "author": "remix team",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/ethereum/remix/issues"
+  },
+  "homepage": "https://github.com/ethereum/remix#readme",
+  "browserify": {
+    "transform": [
+      [
+        "babelify",
+        {
+          "plugins": [
+            [
+              "fast-async",
+              {
+                "runtimePatten": null,
+                "compiler": {
+                  "promises": true,
+                  "es7": true,
+                  "noRuntime": true,
+                  "wrapAwait": true
+                }
+              }
+            ],
+            "transform-object-assign"
+          ]
+        }
+      ],
+      [
+        "babelify",
+        {
+          "presets": [
+            "es2017"
+          ]
+        }
+      ]
+    ]
+  }
+}
diff --git a/remix-simulator/src/methods/accounts.js b/remix-simulator/src/methods/accounts.js
new file mode 100644
index 0000000000..c85493aade
--- /dev/null
+++ b/remix-simulator/src/methods/accounts.js
@@ -0,0 +1,22 @@
+var Web3 = require('web3')
+
+var Accounts = function () {
+  this.web3 = new Web3()
+  // TODO: make it random and/or use remix-libs
+  this.accounts = [this.web3.eth.accounts.create(['abcd'])]
+
+  this.accounts[this.accounts[0].address.toLowerCase()] = this.accounts[0]
+  this.accounts[this.accounts[0].address.toLowerCase()].privateKey = Buffer.from(this.accounts[this.accounts[0].address.toLowerCase()].privateKey.slice(2), 'hex')
+}
+
+Accounts.prototype.methods = function () {
+  return {
+    eth_accounts: this.eth_accounts.bind(this)
+  }
+}
+
+Accounts.prototype.eth_accounts = function (payload, cb) {
+  return cb(null, this.accounts.map((x) => x.address))
+}
+
+module.exports = Accounts
diff --git a/remix-simulator/src/methods/blocks.js b/remix-simulator/src/methods/blocks.js
new file mode 100644
index 0000000000..718070f42c
--- /dev/null
+++ b/remix-simulator/src/methods/blocks.js
@@ -0,0 +1,42 @@
+
+var Blocks = function () {
+}
+
+Blocks.prototype.methods = function () {
+  return {
+    eth_getBlockByNumber: this.eth_getBlockByNumber.bind(this),
+    eth_gasPrice: this.eth_gasPrice.bind(this)
+  }
+}
+
+Blocks.prototype.eth_getBlockByNumber = function (payload, cb) {
+  let b = {
+    'difficulty': '0x0',
+    'extraData': '0x',
+    'gasLimit': '0x7a1200',
+    'gasUsed': '0x0',
+    'hash': '0xdb731f3622ef37b4da8db36903de029220dba74c41185f8429f916058b86559f',
+    'logsBloom': '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
+    'miner': '0x3333333333333333333333333333333333333333',
+    'mixHash': '0x0000000000000000000000000000000000000000000000000000000000000000',
+    'nonce': '0x0000000000000042',
+    'number': '0x0',
+    'parentHash': '0x0000000000000000000000000000000000000000000000000000000000000000',
+    'receiptsRoot': '0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421',
+    'sha3Uncles': '0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
+    'size': '0x1f8',
+    'stateRoot': '0xb7917653f92e62394d2207d0f39a1320ff1cb93d1cee80d3c492627e00b219ff',
+    'timestamp': '0x0',
+    'totalDifficulty': '0x0',
+    'transactions': [],
+    'transactionsRoot': '0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421',
+    'uncles': []
+  }
+  cb(null, b)
+}
+
+Blocks.prototype.eth_gasPrice = function (payload, cb) {
+  cb(null, 1)
+}
+
+module.exports = Blocks
diff --git a/remix-simulator/src/methods/misc.js b/remix-simulator/src/methods/misc.js
new file mode 100644
index 0000000000..a2fd6db044
--- /dev/null
+++ b/remix-simulator/src/methods/misc.js
@@ -0,0 +1,16 @@
+var version = require('../../package.json').version
+
+var Misc = function () {
+}
+
+Misc.prototype.methods = function () {
+  return {
+    web3_clientVersion: this.web3_clientVersion.bind(this)
+  }
+}
+
+Misc.prototype.web3_clientVersion = function (payload, cb) {
+  cb(null, 'Remix Simulator/' + version)
+}
+
+module.exports = Misc
diff --git a/remix-simulator/src/methods/transactions.js b/remix-simulator/src/methods/transactions.js
new file mode 100644
index 0000000000..53834ea7dd
--- /dev/null
+++ b/remix-simulator/src/methods/transactions.js
@@ -0,0 +1,63 @@
+var RemixLib = require('remix-lib')
+var executionContext = RemixLib.execution.executionContext
+var processTx = require('./txProcess.js')
+
+var Transactions = function (accounts) {
+  this.accounts = accounts
+  // TODO: fix me; this is a temporary and very hackish thing just to get the getCode working for now
+  this.deployedContracts = {}
+}
+
+Transactions.prototype.methods = function () {
+  return {
+    eth_sendTransaction: this.eth_sendTransaction.bind(this),
+    eth_getTransactionReceipt: this.eth_getTransactionReceipt.bind(this),
+    eth_getCode: this.eth_getCode.bind(this),
+    eth_call: this.eth_call.bind(this),
+    eth_estimateGas: this.eth_estimateGas.bind(this)
+  }
+}
+
+Transactions.prototype.eth_sendTransaction = function (payload, cb) {
+  processTx(this.accounts, payload, false, cb)
+}
+
+Transactions.prototype.eth_getTransactionReceipt = function (payload, cb) {
+  const self = this
+  executionContext.web3().eth.getTransactionReceipt(payload.params[0], (error, receipt) => {
+    if (error) {
+      return cb(error)
+    }
+    self.deployedContracts[receipt.contractAddress] = receipt.data
+
+    var r = {
+      'transactionHash': receipt.hash,
+      'transactionIndex': '0x00',
+      'blockHash': '0x766d18646a06cf74faeabf38597314f84a82c3851859d9da9d94fc8d037269e5',
+      'blockNumber': '0x06',
+      'gasUsed': '0x06345f',
+      'cumulativeGasUsed': '0x06345f',
+      'contractAddress': receipt.contractAddress,
+      'logs': receipt.logs,
+      'status': 1
+    }
+
+    cb(null, r)
+  })
+}
+
+Transactions.prototype.eth_estimateGas = function (payload, cb) {
+  cb(null, 3000000)
+}
+
+Transactions.prototype.eth_getCode = function (payload, cb) {
+  let address = payload.params[0]
+
+  cb(null, this.deployedContracts[address] || '0x')
+}
+
+Transactions.prototype.eth_call = function (payload, cb) {
+  processTx(this.accounts, payload, true, cb)
+}
+
+module.exports = Transactions
diff --git a/remix-simulator/src/methods/txProcess.js b/remix-simulator/src/methods/txProcess.js
new file mode 100644
index 0000000000..fad01e5e78
--- /dev/null
+++ b/remix-simulator/src/methods/txProcess.js
@@ -0,0 +1,96 @@
+var RemixLib = require('remix-lib')
+var TxExecution = RemixLib.execution.txExecution
+var TxRunner = RemixLib.execution.txRunner
+var executionContext = RemixLib.execution.executionContext
+
+function runCall (payload, from, to, data, value, gasLimit, txRunner, callbacks, callback) {
+  let finalCallback = function (err, result) {
+    if (err) {
+      return callback(err)
+    }
+
+    let toReturn = '0x' + result.result.vm.return.toString('hex')
+    if (toReturn === '0x') {
+      toReturn = '0x0'
+    }
+    return callback(null, toReturn)
+  }
+
+  TxExecution.callFunction(from, to, data, value, gasLimit, null, txRunner, callbacks, finalCallback, true)
+}
+
+function runTx (payload, from, to, data, value, gasLimit, txRunner, callbacks, callback) {
+  let finalCallback = function (err, result) {
+    if (err) {
+      return callback(err)
+    }
+    callback(null, result.transactionHash)
+  }
+
+  TxExecution.callFunction(from, to, data, value, gasLimit, null, txRunner, callbacks, finalCallback, false)
+}
+
+function createContract (payload, from, data, value, gasLimit, txRunner, callbacks, callback) {
+  let finalCallback = function (err, result) {
+    if (err) {
+      return callback(err)
+    }
+    callback(null, result.transactionHash)
+  }
+
+  TxExecution.createContract(from, data, value, gasLimit, txRunner, callbacks, finalCallback)
+}
+
+function processTx (accounts, payload, isCall, callback) {
+  let api = {
+    logMessage: (msg) => {
+    },
+    logHtmlMessage: (msg) => {
+    },
+    config: {
+      getUnpersistedProperty: (key) => {
+        return true
+      },
+      get: () => {
+        return true
+      }
+    },
+    detectNetwork: (cb) => {
+      cb()
+    },
+    personalMode: () => {
+      return false
+    }
+  }
+
+  executionContext.init(api.config)
+
+  let txRunner = new TxRunner(accounts, api)
+  let { from, to, data, value, gas } = payload.params[0]
+  gas = gas || 3000000
+
+  let callbacks = {
+    confirmationCb: (network, tx, gasEstimation, continueTxExecution, cancelCb) => {
+      continueTxExecution(null)
+    },
+    gasEstimationForceSend: (error, continueTxExecution, cancelCb) => {
+      if (error) {
+        continueTxExecution(error)
+      }
+      continueTxExecution()
+    },
+    promptCb: (okCb, cancelCb) => {
+      okCb()
+    }
+  }
+
+  if (isCall) {
+    runCall(payload, from, to, data, value, gas, txRunner, callbacks, callback)
+  } else if (to) {
+    runTx(payload, from, to, data, value, gas, txRunner, callbacks, callback)
+  } else {
+    createContract(payload, from, data, value, gas, txRunner, callbacks, callback)
+  }
+}
+
+module.exports = processTx
diff --git a/remix-simulator/src/methods/whisper.js b/remix-simulator/src/methods/whisper.js
new file mode 100644
index 0000000000..bfd88f43e0
--- /dev/null
+++ b/remix-simulator/src/methods/whisper.js
@@ -0,0 +1,15 @@
+
+var Whisper = function () {
+}
+
+Whisper.prototype.methods = function () {
+  return {
+    shh_version: this.shh_version.bind(this)
+  }
+}
+
+Whisper.prototype.shh_version = function (payload, cb) {
+  cb(null, 5)
+}
+
+module.exports = Whisper
diff --git a/remix-simulator/src/provider.js b/remix-simulator/src/provider.js
new file mode 100644
index 0000000000..6a4327f7b5
--- /dev/null
+++ b/remix-simulator/src/provider.js
@@ -0,0 +1,41 @@
+const log = require('./utils/logs.js')
+const merge = require('merge')
+
+const Accounts = require('./methods/accounts.js')
+const Blocks = require('./methods/blocks.js')
+const Misc = require('./methods/misc.js')
+const Transactions = require('./methods/transactions.js')
+const Whisper = require('./methods/whisper.js')
+
+var Provider = function () {
+  this.Accounts = new Accounts()
+
+  this.methods = {}
+  this.methods = merge(this.methods, this.Accounts.methods())
+  this.methods = merge(this.methods, (new Blocks()).methods())
+  this.methods = merge(this.methods, (new Misc()).methods())
+  this.methods = merge(this.methods, (new Transactions(this.Accounts.accounts)).methods())
+  this.methods = merge(this.methods, (new Whisper()).methods())
+}
+
+Provider.prototype.sendAsync = function (payload, callback) {
+  log.info('payload method is ', payload.method)
+
+  let method = this.methods[payload.method]
+  if (method) {
+    return method.call(method, payload, (err, result) => {
+      if (err) {
+        return callback(err)
+      }
+      let response = {'id': payload.id, 'jsonrpc': '2.0', 'result': result}
+      callback(null, response)
+    })
+  }
+  callback(new Error('unknown method ' + payload.method))
+}
+
+Provider.prototype.isConnected = function () {
+  return true
+}
+
+module.exports = Provider
diff --git a/remix-simulator/src/server.js b/remix-simulator/src/server.js
new file mode 100644
index 0000000000..1171b8826d
--- /dev/null
+++ b/remix-simulator/src/server.js
@@ -0,0 +1,25 @@
+const express = require('express')
+const bodyParser = require('body-parser')
+const app = express()
+const Provider = require('./provider')
+const log = require('./utils/logs.js')
+
+var provider = new Provider()
+
+app.use(bodyParser.urlencoded({extended: true}))
+app.use(bodyParser.json())
+
+app.get('/', (req, res) => {
+  res.send('Welcome to remix-simulator')
+})
+
+app.use(function (req, res) {
+  provider.sendAsync(req.body, (err, jsonResponse) => {
+    if (err) {
+      res.send({error: err})
+    }
+    res.send(jsonResponse)
+  })
+})
+
+app.listen(8545, () => log('Remix Simulator listening on port 8545!'))
diff --git a/remix-simulator/src/utils/logs.js b/remix-simulator/src/utils/logs.js
new file mode 100644
index 0000000000..d117ea9fcb
--- /dev/null
+++ b/remix-simulator/src/utils/logs.js
@@ -0,0 +1,81 @@
+'use strict';
+
+var gray = require('ansi-gray');
+var timestamp = require('time-stamp');
+var supportsColor = require('color-support');
+
+function hasFlag(flag) {
+  return ((typeof(process) !== 'undefined') && (process.argv.indexOf('--' + flag) !== -1));
+}
+
+function addColor(str) {
+  if (hasFlag('no-color')) {
+    return str;
+  }
+
+  if (hasFlag('color')) {
+    return gray(str);
+  }
+
+  if (supportsColor()) {
+    return gray(str);
+  }
+
+  return str;
+}
+
+let logger = {
+  stdout: function(arg) {
+    if (typeof(process) === 'undefined' || !process.stdout) return;
+    process.stdout.write(arg);
+  },
+  stderr: function(arg) {
+    if (typeof(process) === 'undefined' || process.stderr) return;
+    process.stderr.write(arg);
+  },
+};
+
+function getTimestamp(){
+  return '['+addColor(timestamp('HH:mm:ss'))+']';
+}
+
+function log(){
+  var time = getTimestamp();
+  logger.stdout(time + ' ');
+  console.log.apply(console, arguments);
+  return this;
+}
+
+function info(){
+  var time = getTimestamp();
+  logger.stdout(time + ' ');
+  console.info.apply(console, arguments);
+  return this;
+}
+
+function dir(){
+  var time = getTimestamp();
+  logger.stdout(time + ' ');
+  console.dir.apply(console, arguments);
+  return this;
+}
+
+function warn(){
+  var time = getTimestamp();
+  logger.stderr(time + ' ');
+  console.warn.apply(console, arguments);
+  return this;
+}
+
+function error(){
+  var time = getTimestamp();
+  logger.stderr(time + ' ');
+  console.error.apply(console, arguments);
+  return this;
+}
+
+module.exports = log;
+module.exports.info = info;
+module.exports.dir = dir;
+module.exports.warn = warn;
+module.exports.error = error;