diff --git a/.env.example b/.env.example
index 096d574..a5d62f3 100644
--- a/.env.example
+++ b/.env.example
@@ -1,8 +1,6 @@
 NET_ID=42
 RPC_URL=https://kovan.infura.io/v3/a3f4d001c1fc4a359ea70dd27fd9cb51
 PRIVATE_KEY=
-ETH_MIXER_ADDRESS=0x1Cea940cA15a303A0E01B7F8589F39fF34308DB2
-DAI_MIXER_ADDRESS=0x7ed3fC8042e18db889A0466F49c438bB1410b3c7
 # 2.5 means 2.5%
 RELAYER_FEE=2.5
 
diff --git a/README.md b/README.md
index 96831f5..af98406 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@
 1. `npm i`
 2. `cp .env.example .env`
 3. Modify `.env` as needed
+4. If you want to change contracts' addresses go to [config.js](./config.js) file.
 
 ## Deploy Kovan
 1. `cp .env.example deploy/kovan/.env`
diff --git a/config.js b/config.js
index e85cc29..d8deff1 100644
--- a/config.js
+++ b/config.js
@@ -4,20 +4,52 @@ module.exports = {
   netId: Number(process.env.NET_ID) || 42,
   rpcUrl: process.env.RPC_URL || 'https://kovan.infura.io/v3/a3f4d001c1fc4a359ea70dd27fd9cb51',
   privateKey: process.env.PRIVATE_KEY,
-  mixers: [ { 
-    address: process.env.ETH_MIXER_ADDRESS,
-    currency: 'eth',
-    amount: '0.1'
-  }, 
-  { 
-    address: process.env.DAI_MIXER_ADDRESS,
-    currency: 'dai',
-    amount: '100'
-  } ],
+  mixers: {
+    netId1: {
+      dai: {
+        mixerAddress: {
+          '100': undefined,
+          '500': undefined,
+          '1000': undefined,
+          '5000': undefined
+        },
+        tokenAddress: '0x6b175474e89094c44da98b954eedeac495271d0f',
+        decimals: 18
+      },
+      eth: {
+        mixerAddress: {
+          '0.1': undefined,
+          '1': undefined,
+          '10': undefined,
+          '100': undefined
+        },
+        decimals: 18
+      }
+    },
+    netId42: {
+      dai: {
+        mixerAddress: {
+          '100': '0x5D4538D2b07cD8Eb7b93c33B327f3E01A42e68d8',
+          '500': undefined,
+          '1000': undefined,
+          '5000': undefined
+        },
+        tokenAddress: '0x8c158c7e57161dd4d3cb02bf1a3a97fcc78b75fd',
+        decimals: 18
+      },
+      eth: {
+        mixerAddress: {
+          '0.1': '0xB7F60Bf8b969CE4B95Bb50a671860D99478C81Ee',
+          '1': '0x27e94B8cfa33EA2b47E209Ba69804d44642B3545',
+          '10': undefined,
+          '100': undefined
+        },
+        decimals: 18
+      }
+    }
+  },
   defaultGasPrice: 2,
   gasOracleUrls: ['https://www.etherchain.org/api/gasPriceOracle', 'https://gasprice.poa.network/'],
   port: process.env.APP_PORT,
-  //dai
-  tokens: ['0x6b175474e89094c44da98b954eedeac495271d0f'],
   relayerServiceFee: Number(process.env.RELAYER_FEE)
 }
\ No newline at end of file
diff --git a/src/Fetcher.js b/src/Fetcher.js
index 4ffd1f2..fba18bb 100644
--- a/src/Fetcher.js
+++ b/src/Fetcher.js
@@ -1,8 +1,8 @@
 const CoinGecko = require('coingecko-api') 
 const fetch = require('node-fetch')
-const { gasOracleUrls, defaultGasPrice } = require('../config')
 const { toWei } = require('web3-utils')
-const { tokens } = require('../config')
+const { gasOracleUrls, defaultGasPrice } = require('../config')
+const { getMainnetTokens } = require('./utils')
  
 
 class Fetcher {
@@ -16,19 +16,17 @@ class Fetcher {
     }
   }
   async fetchPrices() {
+    const { tokenAddresses, currencyLookup } = getMainnetTokens()
     try {
       const CoinGeckoClient = new CoinGecko()
       const price = await CoinGeckoClient.simple.fetchTokenPrice({
-        contract_addresses: tokens,
+        contract_addresses: tokenAddresses,
         vs_currencies: 'eth',
         assetPlatform: 'ethereum'
       })
-      const addressToSymbol = {
-        '0x6b175474e89094c44da98b954eedeac495271d0f': 'dai'
-      }
       this.ethPrices = Object.entries(price.data).reduce((acc, token) => {
         if (token[1].eth) {
-          acc[addressToSymbol[token[0]]] = toWei(token[1].eth.toString())
+          acc[currencyLookup[token[0]]] = toWei(token[1].eth.toString())
         }
         return acc
       }, {})
diff --git a/src/index.js b/src/index.js
index 6a41d79..b22179d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,7 +1,9 @@
 const express = require('express')
-const { netId, mixers, port, relayerServiceFee } = require('../config')
+const { netId, port, relayerServiceFee } = require('../config')
 const relayController = require('./relayController')
 const { fetcher, web3 } = require('./instances')
+const { getMixers } = require('./utils')
+const mixers = getMixers()
 
 const app = express()
 app.use(express.json())
diff --git a/src/utils.js b/src/utils.js
index 54d555f..81b2a41 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,5 +1,5 @@
 const { isHexStrict, toBN, toWei } = require('web3-utils')
-const { mixers, relayerServiceFee } = require('../config')
+const { netId, mixers, relayerServiceFee } = require('../config')
 
 function isValidProof(proof) {
   // validator expects `websnarkUtils.toSolidityInput(proof)` output
@@ -44,9 +44,12 @@ function isValidArgs(args) {
 }
 
 function isKnownContract(contract) {
-  for (let i = 0; i < mixers.length; i++) {
-    if (mixers[i].address === contract) {
-      return { valid: true, currency: mixers[i].currency, amount: mixers[i].amount }
+  const mixers = getMixers()
+  for (let currency of Object.keys(mixers)) {
+    for (let amount of Object.keys(mixers[currency].mixerAddress)) {
+      if (mixers[currency].mixerAddress[amount] === contract) {
+        return { valid: true, currency, amount }
+      }
     }
   }
   return { valid: false }
@@ -82,4 +85,21 @@ function isEnoughFee({ gas, gasPrices, currency, amount, refund, ethPrices, fee
   return { isEnough: true }
 }
 
-module.exports = { isValidProof, isValidArgs, sleep, isKnownContract, isEnoughFee }
+function getMainnetTokens() {
+  const tokens = mixers['netId1']
+  const tokenAddresses = []
+  const currencyLookup = {}
+  Object.entries(tokens).map(([currency, data]) => {
+    if (currency !== 'eth') {
+      tokenAddresses.push(data.tokenAddress)
+      currencyLookup[data.tokenAddress] = currency
+    }
+  })
+  return { tokenAddresses, currencyLookup }
+}
+
+function getMixers() {
+  return mixers[`netId${netId}`]
+}
+
+module.exports = { isValidProof, isValidArgs, sleep, isKnownContract, isEnoughFee, getMixers, getMainnetTokens }