diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26398124a..15c2d3327 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Current Master
 
+- [#436](https://github.com/poanetwork/nifty-wallet/pull/436) - Allow master copy pattern in importing of proxy contract
 - [#435](https://github.com/poanetwork/nifty-wallet/pull/435) - Allow array input type in contracts interactions
 - [#434](https://github.com/poanetwork/nifty-wallet/pull/434) - Add support of tuple type at interaction with read-only contract methods
 - [#432](https://github.com/poanetwork/nifty-wallet/pull/432) - bump rsk-contract-metadata dependency
diff --git a/old-ui/app/accounts/import/contract.js b/old-ui/app/accounts/import/contract.js
index 65368c635..3d7df0f8a 100644
--- a/old-ui/app/accounts/import/contract.js
+++ b/old-ui/app/accounts/import/contract.js
@@ -25,6 +25,8 @@ class ContractImportView extends Component {
   static propTypes = {
     error: PropTypes.string,
     network: PropTypes.string,
+    RPC_URL: PropTypes.string,
+    provider: PropTypes.object,
     type: PropTypes.string,
     displayWarning: PropTypes.func,
     importNewAccount: PropTypes.func,
@@ -118,12 +120,12 @@ class ContractImportView extends Component {
 
   autodetectContractABI = () => {
     const { contractAddr, web3 } = this.state
-    const { type, network } = this.props
+    const { type, network, provider, RPC_URL } = this.props
     if (!contractAddr || !web3.isAddress(contractAddr)) {
       this.clearABI()
       return
     }
-    getFullABI(web3.eth, contractAddr, network, type)
+    getFullABI(web3.eth, contractAddr, network, type, RPC_URL, provider)
       .then(finalABI => {
         if (finalABI) {
           finalABI = JSON.stringify(finalABI)
@@ -218,6 +220,8 @@ function mapStateToProps (state) {
   const result = {
     error: warning && (warning || warning.message),
     network: state.metamask.network,
+    provider: state.metamask.provider,
+		RPC_URL: state.appState.RPC_URL,
   }
 
   return result
diff --git a/old-ui/app/accounts/import/helpers.js b/old-ui/app/accounts/import/helpers.js
index ea6e50b6f..eabda0171 100644
--- a/old-ui/app/accounts/import/helpers.js
+++ b/old-ui/app/accounts/import/helpers.js
@@ -1,5 +1,8 @@
 import log from 'loglevel'
 import { importTypes } from './enums'
+import Web3 from 'web3'
+import ethNetProps from 'eth-net-props'
+import abi from 'web3-eth-abi'
 
 const nestedJsonObjToArray = (jsonObj) => {
 	return jsonObjToArray(jsonObj)
@@ -100,44 +103,88 @@ const fetchABI = (addr, network) => {
 	})
 }
 
-const getFullABI = (eth, contractAddr, network, type) => {
+const getFullABI = (eth, contractAddr, network, type, RPC_URL, provider) => {
 	return new Promise((resolve, reject) => {
 		fetchABI(contractAddr, network)
 		.then((targetABI) => {
 			targetABI = targetABI && JSON.parse(targetABI)
-			let finalABI = targetABI
 			if (type === importTypes.CONTRACT.PROXY) {
-				if (!eth.contract(targetABI).at(contractAddr).implementation) {
+				if (!eth.contract(targetABI).at(contractAddr).implementation && !isMasterCopyPattern(targetABI)) {
 					const e = {
 						message: 'This is not a valid Delegate Proxy contract',
 					}
 					reject(e)
 				}
 				try {
-					eth.contract(targetABI).at(contractAddr).implementation.call((err, implAddr) => {
-						if (err) {
-							reject(err)
-						} else {
-							fetchABI(implAddr, network)
-							.then((implABI) => {
-								implABI = implABI && JSON.parse(implABI)
-								finalABI = implABI ? targetABI.concat(implABI) : targetABI
-								resolve(finalABI)
-							})
-							.catch(e => reject(e))
+					if (isMasterCopyPattern(targetABI)) {
+						let rpcUrl = RPC_URL || provider.rpcTarget
+						if (rpcUrl === '') {
+							rpcUrl = ethNetProps.RPCEndpoints(network)[0]
 						}
-					})
+						getImplAddrFromMasterCopyPattern(contractAddr, rpcUrl)
+						.then(implAddr => {
+							fetchImplementationAndCombine(implAddr, targetABI, network, resolve, reject)
+						})
+						.catch(err => {
+							reject(err)
+						})
+					} else {
+						eth.contract(targetABI).at(contractAddr).implementation.call((err, implAddr) => {
+							if (err) {
+								reject(err)
+							} else {
+								fetchImplementationAndCombine(implAddr, targetABI, network, resolve, reject)
+							}
+						})
+					}
 				} catch (e) {
 					reject(e)
 				}
 			} else {
-				resolve(finalABI)
+				resolve(targetABI)
 			}
 		})
 		.catch(e => { reject(e) })
 	})
 }
 
+const isMasterCopyPattern = (abi) => {
+	return abi.some(method => {
+		return isMasterCopyInput(method.inputs)
+	})
+}
+
+const isMasterCopyInput = (inputs) => {
+	return inputs && inputs.find(input => {
+		return input.name === '_masterCopy'
+	})
+}
+
+const getImplAddrFromMasterCopyPattern = (address, rpcUrl) => {
+	return new Promise((resolve, reject) => {
+		const web3 = new Web3(new Web3.providers.HttpProvider(rpcUrl))
+		web3.eth.getStorageAt(address, 0, 'latest', (err, result) => {
+			if (err) {
+				reject(err)
+			}
+			if (result) {
+				const implAddr = abi.decodeParameter('address', result)
+				resolve(implAddr)
+			}
+		})
+	})
+}
+
+const fetchImplementationAndCombine = (implAddr, proxyABI, network, resolve, reject) => {
+	return fetchABI(implAddr, network)
+	.then((implABI) => {
+		implABI = implABI && JSON.parse(implABI)
+		const finalABI = implABI ? proxyABI.concat(implABI) : proxyABI
+		resolve(finalABI)
+	})
+	.catch(e => reject(e))
+}
+
 module.exports = {
 	nestedJsonObjToArray,
 	getFullABI,
diff --git a/old-ui/app/components/account-dropdowns/account-dropdowns.component.js b/old-ui/app/components/account-dropdowns/account-dropdowns.component.js
index b513ff938..f37bceb40 100644
--- a/old-ui/app/components/account-dropdowns/account-dropdowns.component.js
+++ b/old-ui/app/components/account-dropdowns/account-dropdowns.component.js
@@ -43,6 +43,8 @@ class AccountDropdowns extends Component {
     style: PropTypes.object,
     enableAccountOptions: PropTypes.bool,
     enableAccountsSelector: PropTypes.bool,
+    RPC_URL: PropTypes.string,
+    provider: PropTypes.object,
   }
 
   constructor (props) {
@@ -229,9 +231,9 @@ class AccountDropdowns extends Component {
   }
 
   updateABI = async () => {
-    const { actions, selected, network } = this.props
+    const { actions, selected, network, RPC_URL, provider } = this.props
     actions.showLoadingIndication()
-    getFullABI(this.web3.eth, selected, network, importTypes.CONTRACT.PROXY)
+    getFullABI(this.web3.eth, selected, network, importTypes.CONTRACT.PROXY, RPC_URL, provider)
       .then(finalABI => {
         actions.updateABI(selected, network, finalABI)
           .then()
@@ -331,6 +333,15 @@ class AccountDropdowns extends Component {
   }
 }
 
+function mapStateToProps (state) {
+  const result = {
+    provider: state.metamask.provider,
+		RPC_URL: state.appState.RPC_URL,
+  }
+
+  return result
+}
+
 const mapDispatchToProps = (dispatch) => {
   return {
     actions: {
@@ -349,5 +360,5 @@ const mapDispatchToProps = (dispatch) => {
 }
 
 module.exports = {
-  AccountDropdowns: connect(null, mapDispatchToProps)(AccountDropdowns),
+  AccountDropdowns: connect(mapStateToProps, mapDispatchToProps)(AccountDropdowns),
 }
diff --git a/old-ui/app/components/send/send-contract.js b/old-ui/app/components/send/send-contract.js
index d7ede129c..8a9b0f5c2 100644
--- a/old-ui/app/components/send/send-contract.js
+++ b/old-ui/app/components/send/send-contract.js
@@ -138,7 +138,7 @@ class SendTransactionScreen extends PersistentForm {
 			copyDisabled: true,
 		}
 
-		let rpcUrl = props.RPC_URL ? props.RPC_URL : props.provider.rpcTarget
+		let rpcUrl = props.RPC_URL || props.provider.rpcTarget
 		if (rpcUrl === '') {
 			rpcUrl = ethNetProps.RPCEndpoints(props.network)[0]
 		}