diff --git a/src/factories/NFTFactory.ts b/src/factories/NFTFactory.ts
index c0c28402..8dff31b1 100644
--- a/src/factories/NFTFactory.ts
+++ b/src/factories/NFTFactory.ts
@@ -10,9 +10,9 @@ import {
   getFreCreationParams,
   getErcCreationParams,
   getPoolCreationParams,
-  configHelperNetworks,
   setContractDefaults,
-  ZERO_ADDRESS
+  ZERO_ADDRESS,
+  ConfigHelper
 } from '../utils'
 import { Config } from '../models/index.js'
 import {
@@ -66,13 +66,14 @@ export class NftFactory {
   constructor(
     factory721Address: string,
     web3: Web3,
+    network?: string | number,
     factory721Abi?: AbiItem | AbiItem[],
     config?: Config
   ) {
     this.factory721Address = factory721Address
     this.factory721Abi = factory721Abi || (defaultFactory721Abi.abi as AbiItem[])
     this.web3 = web3
-    this.config = config || configHelperNetworks[0]
+    this.config = config || new ConfigHelper().getConfig(network || 'unknown')
     this.factory721 = setContractDefaults(
       new this.web3.eth.Contract(this.factory721Abi, this.factory721Address),
       this.config
diff --git a/src/pools/Router.ts b/src/pools/Router.ts
index 0c6f56f5..a111eec4 100644
--- a/src/pools/Router.ts
+++ b/src/pools/Router.ts
@@ -3,7 +3,7 @@ import Web3 from 'web3'
 import { TransactionReceipt } from 'web3-core'
 import { AbiItem } from 'web3-utils'
 import defaultRouter from '@oceanprotocol/contracts/artifacts/contracts/pools/FactoryRouter.sol/FactoryRouter.json'
-import { getFairGasPrice, setContractDefaults, configHelperNetworks } from '../utils'
+import { getFairGasPrice, setContractDefaults, ConfigHelper } from '../utils'
 import { Operation } from '../@types/Router'
 import { Config } from '../models/index.js'
 
@@ -27,13 +27,14 @@ export class Router {
   constructor(
     routerAddress: string,
     web3: Web3,
+    network?: string | number,
     RouterAbi?: AbiItem | AbiItem[],
     config?: Config
   ) {
     this.routerAddress = routerAddress
     this.RouterAbi = RouterAbi || (defaultRouter.abi as AbiItem[])
     this.web3 = web3
-    this.config = config || configHelperNetworks[0]
+    this.config = config || new ConfigHelper().getConfig(network || 'unknown')
     this.router = setContractDefaults(
       new this.web3.eth.Contract(this.RouterAbi, this.routerAddress),
       this.config
diff --git a/src/pools/balancer/Pool.ts b/src/pools/balancer/Pool.ts
index 8228175d..76ff7ed2 100644
--- a/src/pools/balancer/Pool.ts
+++ b/src/pools/balancer/Pool.ts
@@ -4,11 +4,11 @@ import { TransactionReceipt } from 'web3-core'
 import { Contract } from 'web3-eth-contract'
 import {
   getFairGasPrice,
-  configHelperNetworks,
   setContractDefaults,
   unitsToAmount,
   amountToUnits,
-  LoggerInstance
+  LoggerInstance,
+  ConfigHelper
 } from '../../utils'
 import BigNumber from 'bignumber.js'
 import PoolTemplate from '@oceanprotocol/contracts/artifacts/contracts/pools/balancer/BPool.sol/BPool.json'
@@ -40,11 +40,16 @@ export class Pool {
   public GASLIMIT_DEFAULT = 1000000
   private config: Config
 
-  constructor(web3: Web3, poolAbi: AbiItem | AbiItem[] = null, config?: Config) {
+  constructor(
+    web3: Web3,
+    network?: string | number,
+    poolAbi: AbiItem | AbiItem[] = null,
+    config?: Config
+  ) {
     if (poolAbi) this.poolAbi = poolAbi
     else this.poolAbi = PoolTemplate.abi as AbiItem[]
     this.web3 = web3
-    this.config = config || configHelperNetworks[0]
+    this.config = config || new ConfigHelper().getConfig(network || 'unknown')
   }
 
   /**
diff --git a/src/pools/dispenser/Dispenser.ts b/src/pools/dispenser/Dispenser.ts
index 22b1f42b..31916eb8 100644
--- a/src/pools/dispenser/Dispenser.ts
+++ b/src/pools/dispenser/Dispenser.ts
@@ -7,8 +7,8 @@ import defaultDispenserAbi from '@oceanprotocol/contracts/artifacts/contracts/po
 import {
   LoggerInstance as logger,
   getFairGasPrice,
-  configHelperNetworks,
-  setContractDefaults
+  setContractDefaults,
+  ConfigHelper
 } from '../../utils/'
 import { Datatoken } from '../../tokens'
 import { Config } from '../../models/index.js'
@@ -39,6 +39,7 @@ export class Dispenser {
    */
   constructor(
     web3: Web3,
+    network?: string | number,
     dispenserAddress: string = null,
     dispenserAbi: AbiItem | AbiItem[] = null,
     config?: Config
@@ -46,7 +47,7 @@ export class Dispenser {
     this.web3 = web3
     this.dispenserAddress = dispenserAddress
     this.dispenserAbi = dispenserAbi || (defaultDispenserAbi.abi as AbiItem[])
-    this.config = config || configHelperNetworks[0]
+    this.config = config || new ConfigHelper().getConfig(network || 'unknown')
     if (web3)
       this.dispenserContract = setContractDefaults(
         new this.web3.eth.Contract(this.dispenserAbi, this.dispenserAddress),
diff --git a/src/pools/fixedRate/FixedRateExchange.ts b/src/pools/fixedRate/FixedRateExchange.ts
index 90e2bab9..2b8a8929 100644
--- a/src/pools/fixedRate/FixedRateExchange.ts
+++ b/src/pools/fixedRate/FixedRateExchange.ts
@@ -6,11 +6,11 @@ import Web3 from 'web3'
 import {
   LoggerInstance,
   getFairGasPrice,
-  configHelperNetworks,
   setContractDefaults,
   amountToUnits,
   unitsToAmount,
-  ZERO_ADDRESS
+  ZERO_ADDRESS,
+  ConfigHelper
 } from '../../utils'
 import { Config } from '../../models/index.js'
 import { PriceAndFees } from '../..'
@@ -75,12 +75,13 @@ export class FixedRateExchange {
   constructor(
     web3: Web3,
     fixedRateAddress: string,
+    network?: string | number,
     fixedRateExchangeAbi: AbiItem | AbiItem[] = null,
     oceanAddress: string = null,
     config?: Config
   ) {
     this.web3 = web3
-    this.config = config || configHelperNetworks[0]
+    this.config = config || new ConfigHelper().getConfig(network || 'unknown')
     this.fixedRateExchangeAbi =
       fixedRateExchangeAbi || (defaultFixedRateExchangeAbi.abi as AbiItem[])
     this.oceanAddress = oceanAddress
diff --git a/src/pools/ssContracts/SideStaking.ts b/src/pools/ssContracts/SideStaking.ts
index b1dda5d0..1ec9c5f4 100644
--- a/src/pools/ssContracts/SideStaking.ts
+++ b/src/pools/ssContracts/SideStaking.ts
@@ -2,7 +2,7 @@ import Web3 from 'web3'
 import { AbiItem } from 'web3-utils/types'
 import { TransactionReceipt } from 'web3-core'
 import { Contract } from 'web3-eth-contract'
-import { LoggerInstance, getFairGasPrice, configHelperNetworks } from '../../utils'
+import { LoggerInstance, getFairGasPrice, ConfigHelper } from '../../utils'
 import BigNumber from 'bignumber.js'
 import SideStakingTemplate from '@oceanprotocol/contracts/artifacts/contracts/pools/ssContracts/SideStaking.sol/SideStaking.json'
 import defaultErc20Abi from '@oceanprotocol/contracts/artifacts/contracts/templates/ERC20Template.sol/ERC20Template.json'
@@ -14,11 +14,16 @@ export class SideStaking {
   public GASLIMIT_DEFAULT = 1000000
   public config: Config
 
-  constructor(web3: Web3, ssAbi: AbiItem | AbiItem[] = null, config?: Config) {
+  constructor(
+    web3: Web3,
+    network?: string | number,
+    ssAbi: AbiItem | AbiItem[] = null,
+    config?: Config
+  ) {
     if (ssAbi) this.ssAbi = ssAbi
     else this.ssAbi = SideStakingTemplate.abi as AbiItem[]
     this.web3 = web3
-    this.config = config || configHelperNetworks[0]
+    this.config = config || new ConfigHelper().getConfig(network || 'unknown')
   }
 
   async amountToUnits(token: string, amount: string): Promise<string> {
diff --git a/src/tokens/Datatoken.ts b/src/tokens/Datatoken.ts
index bcebc1df..d1197b5f 100644
--- a/src/tokens/Datatoken.ts
+++ b/src/tokens/Datatoken.ts
@@ -9,9 +9,9 @@ import {
   LoggerInstance,
   getFairGasPrice,
   setContractDefaults,
-  configHelperNetworks,
   getFreOrderParams,
-  ZERO_ADDRESS
+  ZERO_ADDRESS,
+  ConfigHelper
 } from '../utils'
 import {
   ConsumeMarketFee,
@@ -61,6 +61,7 @@ export class Datatoken {
    */
   constructor(
     web3: Web3,
+    network?: string | number,
     datatokensAbi?: AbiItem | AbiItem[],
     datatokensEnterpriseAbi?: AbiItem | AbiItem[],
     config?: Config
@@ -69,7 +70,7 @@ export class Datatoken {
     this.datatokensAbi = datatokensAbi || (defaultDatatokensAbi.abi as AbiItem[])
     this.datatokensEnterpriseAbi =
       datatokensEnterpriseAbi || (defaultDatatokensEnterpriseAbi.abi as AbiItem[])
-    this.config = config || configHelperNetworks[0]
+    this.config = config || new ConfigHelper().getConfig(network || 'unknown')
     this.nft = new Nft(this.web3)
   }
 
diff --git a/src/tokens/NFT.ts b/src/tokens/NFT.ts
index b0322e0b..0b93160b 100644
--- a/src/tokens/NFT.ts
+++ b/src/tokens/NFT.ts
@@ -7,7 +7,7 @@ import {
   getFairGasPrice,
   generateDtName,
   setContractDefaults,
-  configHelperNetworks
+  ConfigHelper
 } from '../utils'
 import { Contract } from 'web3-eth-contract'
 import { MetadataProof } from '../../src/@types'
@@ -33,10 +33,15 @@ export class Nft {
   public startBlock: number
   public config: Config
 
-  constructor(web3: Web3, nftAbi?: AbiItem | AbiItem[], config?: Config) {
+  constructor(
+    web3: Web3,
+    network?: string | number,
+    nftAbi?: AbiItem | AbiItem[],
+    config?: Config
+  ) {
     this.nftAbi = nftAbi || (defaultNftAbi.abi as AbiItem[])
     this.web3 = web3
-    this.config = config || configHelperNetworks[0]
+    this.config = config || new ConfigHelper().getConfig(network || 'unknown')
   }
 
   /**
diff --git a/test/unit/pools/balancer/Pool.test.ts b/test/unit/pools/balancer/Pool.test.ts
index 39bc5551..68ce2b4e 100644
--- a/test/unit/pools/balancer/Pool.test.ts
+++ b/test/unit/pools/balancer/Pool.test.ts
@@ -54,7 +54,7 @@ describe('Pool unit test', () => {
     contracts = await deployContracts(web3, factoryOwner)
 
     // initialize Pool instance
-    pool = new Pool(web3, PoolTemplate.abi as AbiItem[])
+    pool = new Pool(web3, 8996, PoolTemplate.abi as AbiItem[])
     assert(pool != null)
 
     daiContract = new web3.eth.Contract(MockERC20.abi as AbiItem[], contracts.daiAddress)
@@ -143,6 +143,7 @@ describe('Pool unit test', () => {
       const nftFactory = new NftFactory(
         contracts.erc721FactoryAddress,
         web3,
+        8996,
         ERC721Factory.abi as AbiItem[]
       )
 
@@ -572,6 +573,7 @@ describe('Pool unit test', () => {
       const nftFactory = new NftFactory(
         contracts.erc721FactoryAddress,
         web3,
+        8996,
         ERC721Factory.abi as AbiItem[]
       )
 
diff --git a/test/unit/pools/dispenser/Dispenser.test.ts b/test/unit/pools/dispenser/Dispenser.test.ts
index 637d3b35..08aa72fd 100644
--- a/test/unit/pools/dispenser/Dispenser.test.ts
+++ b/test/unit/pools/dispenser/Dispenser.test.ts
@@ -43,6 +43,7 @@ describe('Dispenser flow', () => {
   it('should initialize Dispenser class', async () => {
     DispenserClass = new Dispenser(
       web3,
+      8996,
       contracts.dispenserAddress,
       DispenserTemplate.abi as AbiItem[]
     )
@@ -87,7 +88,7 @@ describe('Dispenser flow', () => {
   })
 
   it('Make user2 minter', async () => {
-    datatoken = new Datatoken(web3, ERC20Template.abi as AbiItem[])
+    datatoken = new Datatoken(web3, 8996, ERC20Template.abi as AbiItem[])
     await datatoken.addMinter(dtAddress, factoryOwner, user2)
     assert((await datatoken.getDTPermissions(dtAddress, user2)).minter === true)
   })
diff --git a/test/unit/pools/fixedRate/FixedRateExchange.test.ts b/test/unit/pools/fixedRate/FixedRateExchange.test.ts
index 0d995079..28e43472 100644
--- a/test/unit/pools/fixedRate/FixedRateExchange.test.ts
+++ b/test/unit/pools/fixedRate/FixedRateExchange.test.ts
@@ -118,6 +118,7 @@ describe('Fixed Rate unit test', () => {
       fixedRate = new FixedRateExchange(
         web3,
         fixedRateAddress,
+        8996,
         FixedRate.abi as AbiItem[],
         contracts.oceanAddress
       )
@@ -438,6 +439,7 @@ describe('Fixed Rate unit test', () => {
       fixedRate = new FixedRateExchange(
         web3,
         fixedRateAddress,
+        8996,
         FixedRate.abi as AbiItem[],
         contracts.oceanAddress
       )
diff --git a/test/unit/pools/ssContracts/SideStaking.test.ts b/test/unit/pools/ssContracts/SideStaking.test.ts
index ab98e82c..d9efdebd 100644
--- a/test/unit/pools/ssContracts/SideStaking.test.ts
+++ b/test/unit/pools/ssContracts/SideStaking.test.ts
@@ -59,10 +59,10 @@ describe('SideStaking unit test', () => {
     sideStakingAddress = contracts.sideStakingAddress
 
     // initialize Pool instance
-    pool = new Pool(web3, PoolTemplate.abi as AbiItem[])
+    pool = new Pool(web3, 8996, PoolTemplate.abi as AbiItem[])
     assert(pool != null)
     //
-    sideStaking = new SideStaking(web3, SSContract.abi as AbiItem[])
+    sideStaking = new SideStaking(web3, 8996, SSContract.abi as AbiItem[])
     assert(sideStaking != null)
 
     daiContract = new web3.eth.Contract(MockERC20.abi as AbiItem[], contracts.daiAddress)
diff --git a/test/unit/tokens/Datatoken.test.ts b/test/unit/tokens/Datatoken.test.ts
index 90080c06..78eb9781 100644
--- a/test/unit/tokens/Datatoken.test.ts
+++ b/test/unit/tokens/Datatoken.test.ts
@@ -62,6 +62,7 @@ describe('Datatoken', () => {
     nftFactory = new NftFactory(
       contracts.erc721FactoryAddress,
       web3,
+      8996,
       ERC721Factory.abi as AbiItem[]
     )
     const nftData: NftCreateData = {
@@ -74,7 +75,7 @@ describe('Datatoken', () => {
     }
 
     nftAddress = await nftFactory.createNFT(nftOwner, nftData)
-    nftDatatoken = new Nft(web3, ERC721Template.abi as AbiItem[])
+    nftDatatoken = new Nft(web3, 8996, ERC721Template.abi as AbiItem[])
   })
 
   it('#createERC20 - should create a new ERC20 DT from NFT contract', async () => {
@@ -98,6 +99,7 @@ describe('Datatoken', () => {
   it('should initialize DT20 Instance', async () => {
     datatoken = new Datatoken(
       web3,
+      8996,
       ERC20Template.abi as AbiItem[],
       ERC20TemplateEnterprise.abi as AbiItem[]
     )
diff --git a/test/unit/tokens/Nft.test.ts b/test/unit/tokens/Nft.test.ts
index acd812be..42637886 100644
--- a/test/unit/tokens/Nft.test.ts
+++ b/test/unit/tokens/Nft.test.ts
@@ -39,6 +39,7 @@ describe('NFT', () => {
     nftFactory = new NftFactory(
       contracts.erc721FactoryAddress,
       web3,
+      8996,
       ERC721Factory.abi as AbiItem[]
     )
     const nftData: NftCreateData = {
@@ -51,7 +52,7 @@ describe('NFT', () => {
     }
 
     nftAddress = await nftFactory.createNFT(nftOwner, nftData)
-    nftDatatoken = new Nft(web3, ERC721Template.abi as AbiItem[])
+    nftDatatoken = new Nft(web3, 8996, ERC721Template.abi as AbiItem[])
   })
   it('#getTokenURI', async () => {
     const tokenURI = await nftDatatoken.getTokenURI(nftAddress, 1)