diff --git a/contracts/helper/ChainlinkCOMPUSDCPriceOracleProxy.sol b/contracts/helper/ChainlinkCOMPUSDCPriceOracleProxy.sol
new file mode 100644
index 0000000..6f9bce8
--- /dev/null
+++ b/contracts/helper/ChainlinkCOMPUSDCPriceOracleProxy.sol
@@ -0,0 +1,25 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+
+interface IChainlink {
+    function latestAnswer() external view returns (uint256);
+}
+
+
+// for COMP-USDC(decimals=6) price convert
+
+contract ChainlinkCOMPUSDCPriceOracleProxy {
+    address public chainlink = 0xdbd020CAeF83eFd542f4De03e3cF0C28A4428bd5;
+
+    function getPrice() external view returns (uint256) {
+        return IChainlink(chainlink).latestAnswer() / 100;
+    }
+}
diff --git a/contracts/helper/ChainlinkEthPriceOracleProxy.sol b/contracts/helper/ChainlinkEthPriceOracleProxy.sol
index 47a6852..53036a7 100644
--- a/contracts/helper/ChainlinkEthPriceOracleProxy.sol
+++ b/contracts/helper/ChainlinkEthPriceOracleProxy.sol
@@ -8,14 +8,16 @@
 pragma solidity 0.6.9;
 pragma experimental ABIEncoderV2;
 
+
 interface IChainlink {
     function latestAnswer() external view returns (uint256);
 }
 
+
 // for WETH-USDC(decimals=6) price convert
 
 contract ChainlinkETHPriceOracleProxy {
-    address public chainlink = 0xF79D6aFBb6dA890132F9D7c355e3015f15F3406F;
+    address public chainlink = 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419;
 
     function getPrice() external view returns (uint256) {
         return IChainlink(chainlink).latestAnswer() / 100;
diff --git a/contracts/helper/ChainlinkLENDUSDCPriceOracleProxy.sol b/contracts/helper/ChainlinkLENDUSDCPriceOracleProxy.sol
new file mode 100644
index 0000000..c338136
--- /dev/null
+++ b/contracts/helper/ChainlinkLENDUSDCPriceOracleProxy.sol
@@ -0,0 +1,25 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+
+interface IChainlink {
+    function latestAnswer() external view returns (uint256);
+}
+
+
+// for LEND-USDC(decimals=6) price convert
+
+contract ChainlinkLENDUSDCPriceOracleProxy {
+    address public chainlink = 0x4aB81192BB75474Cf203B56c36D6a13623270A67;
+
+    function getPrice() external view returns (uint256) {
+        return IChainlink(chainlink).latestAnswer() / 100;
+    }
+}
diff --git a/contracts/helper/ChainlinkLINKUSDPriceOracleProxy.sol b/contracts/helper/ChainlinkLINKUSDPriceOracleProxy.sol
new file mode 100644
index 0000000..fe6615d
--- /dev/null
+++ b/contracts/helper/ChainlinkLINKUSDPriceOracleProxy.sol
@@ -0,0 +1,25 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+
+interface IChainlink {
+    function latestAnswer() external view returns (uint256);
+}
+
+
+// for LINK-USDC(decimals=6) price convert
+
+contract ChainlinkLINKUSDCPriceOracleProxy {
+    address public chainlink = 0x2c1d072e956AFFC0D435Cb7AC38EF18d24d9127c;
+
+    function getPrice() external view returns (uint256) {
+        return IChainlink(chainlink).latestAnswer() / 100;
+    }
+}
diff --git a/contracts/helper/ChainlinkSNXUSDPriceOracleProxy.sol b/contracts/helper/ChainlinkSNXUSDPriceOracleProxy.sol
new file mode 100644
index 0000000..e3d478c
--- /dev/null
+++ b/contracts/helper/ChainlinkSNXUSDPriceOracleProxy.sol
@@ -0,0 +1,25 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+
+interface IChainlink {
+    function latestAnswer() external view returns (uint256);
+}
+
+
+// for SNX-USDC(decimals=6) price convert
+
+contract ChainlinkSNXUSDCPriceOracleProxy {
+    address public chainlink = 0xDC3EA94CD0AC27d9A86C180091e7f78C683d3699;
+
+    function getPrice() external view returns (uint256) {
+        return IChainlink(chainlink).latestAnswer() / 100;
+    }
+}
diff --git a/contracts/helper/ChainlinkWBTCUSDCPriceOracleProxy.sol b/contracts/helper/ChainlinkWBTCUSDCPriceOracleProxy.sol
new file mode 100644
index 0000000..ae78ebd
--- /dev/null
+++ b/contracts/helper/ChainlinkWBTCUSDCPriceOracleProxy.sol
@@ -0,0 +1,25 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+
+interface IChainlink {
+    function latestAnswer() external view returns (uint256);
+}
+
+
+// for WBTC(decimals=8)-USDC(decimals=6) price convert
+
+contract ChainlinkWBTCUSDCPriceOracleProxy {
+    address public chainlink = 0xF4030086522a5bEEa4988F8cA5B36dbC97BeE88c;
+
+    function getPrice() external view returns (uint256) {
+        return IChainlink(chainlink).latestAnswer() * (10**8);
+    }
+}
diff --git a/contracts/helper/MinimumOracle.sol b/contracts/helper/MinimumOracle.sol
new file mode 100644
index 0000000..0056add
--- /dev/null
+++ b/contracts/helper/MinimumOracle.sol
@@ -0,0 +1,56 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+
+interface IMinimumOracle {
+    function getPrice() external view returns (uint256);
+
+    function setPrice(uint256 newPrice) external;
+
+    function transferOwnership(address newOwner) external;
+}
+
+
+contract MinimumOracle {
+    address public _OWNER_;
+    uint256 public tokenPrice;
+
+    // ============ Events ============
+
+    event OwnershipTransfer(address indexed previousOwner, address indexed newOwner);
+
+    // ============ Modifiers ============
+
+    modifier onlyOwner() {
+        require(msg.sender == _OWNER_, "NOT_OWNER");
+        _;
+    }
+
+    // ============ Functions ============
+
+    constructor() public {
+        _OWNER_ = msg.sender;
+        emit OwnershipTransfer(address(0), _OWNER_);
+    }
+
+    function transferOwnership(address newOwner) external onlyOwner {
+        require(newOwner != address(0), "INVALID_OWNER");
+        emit OwnershipTransfer(_OWNER_, newOwner);
+        _OWNER_ = newOwner;
+    }
+
+    function setPrice(uint256 newPrice) external onlyOwner {
+        tokenPrice = newPrice;
+    }
+
+    function getPrice() external view returns (uint256) {
+        return tokenPrice;
+    }
+}
diff --git a/contracts/helper/MultiSigWalletWithTimeLock.sol b/contracts/helper/MultiSigWalletWithTimeLock.sol
deleted file mode 100644
index 28af423..0000000
--- a/contracts/helper/MultiSigWalletWithTimeLock.sol
+++ /dev/null
@@ -1,423 +0,0 @@
-/**
- *Submitted for verification at Etherscan.io on 2019-10-15
- */
-
-/*
-
-    Copyright 2019 The Hydro Protocol Foundation
-
-    Licensed under the Apache License, Version 2.0 (the "License");
-    you may not use this file except in compliance with the License.
-    You may obtain a copy of the License at
-
-        http://www.apache.org/licenses/LICENSE-2.0
-
-    Unless required by applicable law or agreed to in writing, software
-    distributed under the License is distributed on an "AS IS" BASIS,
-    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-    See the License for the specific language governing permissions and
-    limitations under the License.
-
-*/
-
-pragma solidity 0.5.8;
-pragma experimental ABIEncoderV2;
-
-contract MultiSigWalletWithTimelock {
-    uint256 public constant MAX_OWNER_COUNT = 50;
-    uint256 public lockSeconds = 86400;
-
-    event Confirmation(address indexed sender, uint256 indexed transactionId);
-    event Revocation(address indexed sender, uint256 indexed transactionId);
-    event Submission(uint256 indexed transactionId);
-    event Execution(uint256 indexed transactionId);
-    event ExecutionFailure(uint256 indexed transactionId);
-    event Deposit(address indexed sender, uint256 value);
-    event OwnerAddition(address indexed owner);
-    event OwnerRemoval(address indexed owner);
-    event RequirementChange(uint256 required);
-    event UnlockTimeSet(uint256 indexed transactionId, uint256 confirmationTime);
-    event LockSecondsChange(uint256 lockSeconds);
-
-    mapping(uint256 => Transaction) public transactions;
-    mapping(uint256 => mapping(address => bool)) public confirmations;
-    mapping(address => bool) public isOwner;
-    mapping(uint256 => uint256) public unlockTimes;
-
-    address[] public owners;
-    uint256 public required;
-    uint256 public transactionCount;
-
-    struct Transaction {
-        address destination;
-        uint256 value;
-        bytes data;
-        bool executed;
-    }
-
-    struct EmergencyCall {
-        bytes32 selector;
-        uint256 paramsBytesCount;
-    }
-
-    // Functions bypass the time lock process
-    EmergencyCall[] public emergencyCalls;
-
-    modifier onlyWallet() {
-        if (msg.sender != address(this)) revert("ONLY_WALLET_ERROR");
-        _;
-    }
-
-    modifier ownerDoesNotExist(address owner) {
-        if (isOwner[owner]) revert("OWNER_DOES_NOT_EXIST_ERROR");
-        _;
-    }
-
-    modifier ownerExists(address owner) {
-        if (!isOwner[owner]) revert("OWNER_EXISTS_ERROR");
-        _;
-    }
-
-    modifier transactionExists(uint256 transactionId) {
-        if (transactions[transactionId].destination == address(0))
-            revert("TRANSACTION_EXISTS_ERROR");
-        _;
-    }
-
-    modifier confirmed(uint256 transactionId, address owner) {
-        if (!confirmations[transactionId][owner]) revert("CONFIRMED_ERROR");
-        _;
-    }
-
-    modifier notConfirmed(uint256 transactionId, address owner) {
-        if (confirmations[transactionId][owner]) revert("NOT_CONFIRMED_ERROR");
-        _;
-    }
-
-    modifier notExecuted(uint256 transactionId) {
-        if (transactions[transactionId].executed) revert("NOT_EXECUTED_ERROR");
-        _;
-    }
-
-    modifier notNull(address _address) {
-        if (_address == address(0)) revert("NOT_NULL_ERROR");
-        _;
-    }
-
-    modifier validRequirement(uint256 ownerCount, uint256 _required) {
-        if (
-            ownerCount > MAX_OWNER_COUNT ||
-            _required > ownerCount ||
-            _required == 0 ||
-            ownerCount == 0
-        ) revert("VALID_REQUIREMENT_ERROR");
-        _;
-    }
-
-    /** @dev Fallback function allows to deposit ether. */
-    function() external payable {
-        if (msg.value > 0) {
-            emit Deposit(msg.sender, msg.value);
-        }
-    }
-
-    /** @dev Contract constructor sets initial owners and required number of confirmations.
-     * @param _owners List of initial owners.
-     * @param _required Number of required confirmations.
-     */
-    constructor(address[] memory _owners, uint256 _required)
-        public
-        validRequirement(_owners.length, _required)
-    {
-        for (uint256 i = 0; i < _owners.length; i++) {
-            if (isOwner[_owners[i]] || _owners[i] == address(0)) {
-                revert("OWNER_ERROR");
-            }
-
-            isOwner[_owners[i]] = true;
-        }
-
-        owners = _owners;
-        required = _required;
-
-        // initialzie Emergency calls
-        emergencyCalls.push(
-            EmergencyCall({
-                selector: keccak256(abi.encodePacked("setMarketBorrowUsability(uint16,bool)")),
-                paramsBytesCount: 64
-            })
-        );
-    }
-
-    function getEmergencyCallsCount() external view returns (uint256 count) {
-        return emergencyCalls.length;
-    }
-
-    /** @dev Allows to add a new owner. Transaction has to be sent by wallet.
-     * @param owner Address of new owner.
-     */
-    function addOwner(address owner)
-        external
-        onlyWallet
-        ownerDoesNotExist(owner)
-        notNull(owner)
-        validRequirement(owners.length + 1, required)
-    {
-        isOwner[owner] = true;
-        owners.push(owner);
-        emit OwnerAddition(owner);
-    }
-
-    /** @dev Allows to remove an owner. Transaction has to be sent by wallet.
-     * @param owner Address of owner.
-     */
-    function removeOwner(address owner) external onlyWallet ownerExists(owner) {
-        isOwner[owner] = false;
-        for (uint256 i = 0; i < owners.length - 1; i++) {
-            if (owners[i] == owner) {
-                owners[i] = owners[owners.length - 1];
-                break;
-            }
-        }
-
-        owners.length -= 1;
-
-        if (required > owners.length) {
-            changeRequirement(owners.length);
-        }
-
-        emit OwnerRemoval(owner);
-    }
-
-    /** @dev Allows to replace an owner with a new owner. Transaction has to be sent by wallet.
-     * @param owner Address of owner to be replaced.
-     * @param owner Address of new owner.
-     */
-    function replaceOwner(address owner, address newOwner)
-        external
-        onlyWallet
-        ownerExists(owner)
-        ownerDoesNotExist(newOwner)
-    {
-        for (uint256 i = 0; i < owners.length; i++) {
-            if (owners[i] == owner) {
-                owners[i] = newOwner;
-                break;
-            }
-        }
-
-        isOwner[owner] = false;
-        isOwner[newOwner] = true;
-        emit OwnerRemoval(owner);
-        emit OwnerAddition(newOwner);
-    }
-
-    /** @dev Allows to change the number of required confirmations. Transaction has to be sent by wallet.
-     * @param _required Number of required confirmations.
-     */
-    function changeRequirement(uint256 _required)
-        public
-        onlyWallet
-        validRequirement(owners.length, _required)
-    {
-        required = _required;
-        emit RequirementChange(_required);
-    }
-
-    /** @dev Changes the duration of the time lock for transactions.
-     * @param _lockSeconds Duration needed after a transaction is confirmed and before it becomes executable, in seconds.
-     */
-    function changeLockSeconds(uint256 _lockSeconds) external onlyWallet {
-        lockSeconds = _lockSeconds;
-        emit LockSecondsChange(_lockSeconds);
-    }
-
-    /** @dev Allows an owner to submit and confirm a transaction.
-     * @param destination Transaction target address.
-     * @param value Transaction ether value.
-     * @param data Transaction data payload.
-     * @return Returns transaction ID.
-     */
-    function submitTransaction(
-        address destination,
-        uint256 value,
-        bytes calldata data
-    ) external ownerExists(msg.sender) notNull(destination) returns (uint256 transactionId) {
-        transactionId = transactionCount;
-        transactions[transactionId] = Transaction({
-            destination: destination,
-            value: value,
-            data: data,
-            executed: false
-        });
-        transactionCount += 1;
-        emit Submission(transactionId);
-        confirmTransaction(transactionId);
-    }
-
-    /** @dev Allows an owner to confirm a transaction.
-     * @param transactionId Transaction ID.
-     */
-    function confirmTransaction(uint256 transactionId)
-        public
-        ownerExists(msg.sender)
-        transactionExists(transactionId)
-        notConfirmed(transactionId, msg.sender)
-    {
-        confirmations[transactionId][msg.sender] = true;
-        emit Confirmation(msg.sender, transactionId);
-
-        if (
-            isConfirmed(transactionId) &&
-            unlockTimes[transactionId] == 0 &&
-            !isEmergencyCall(transactionId)
-        ) {
-            uint256 unlockTime = block.timestamp + lockSeconds;
-            unlockTimes[transactionId] = unlockTime;
-            emit UnlockTimeSet(transactionId, unlockTime);
-        }
-    }
-
-    function isEmergencyCall(uint256 transactionId) internal view returns (bool) {
-        bytes memory data = transactions[transactionId].data;
-
-        for (uint256 i = 0; i < emergencyCalls.length; i++) {
-            EmergencyCall memory emergencyCall = emergencyCalls[i];
-
-            if (
-                data.length == emergencyCall.paramsBytesCount + 4 &&
-                data.length >= 4 &&
-                emergencyCall.selector[0] == data[0] &&
-                emergencyCall.selector[1] == data[1] &&
-                emergencyCall.selector[2] == data[2] &&
-                emergencyCall.selector[3] == data[3]
-            ) {
-                return true;
-            }
-        }
-
-        return false;
-    }
-
-    /** @dev Allows an owner to revoke a confirmation for a transaction.
-     * @param transactionId Transaction ID.
-     */
-    function revokeConfirmation(uint256 transactionId)
-        external
-        ownerExists(msg.sender)
-        confirmed(transactionId, msg.sender)
-        notExecuted(transactionId)
-    {
-        confirmations[transactionId][msg.sender] = false;
-        emit Revocation(msg.sender, transactionId);
-    }
-
-    /** @dev Allows anyone to execute a confirmed transaction.
-     * @param transactionId Transaction ID.
-     */
-    function executeTransaction(uint256 transactionId)
-        external
-        ownerExists(msg.sender)
-        notExecuted(transactionId)
-    {
-        require(block.timestamp >= unlockTimes[transactionId], "TRANSACTION_NEED_TO_UNLOCK");
-
-        if (isConfirmed(transactionId)) {
-            Transaction storage transaction = transactions[transactionId];
-            transaction.executed = true;
-            (bool success, ) = transaction.destination.call.value(transaction.value)(
-                transaction.data
-            );
-            if (success) emit Execution(transactionId);
-            else {
-                emit ExecutionFailure(transactionId);
-                transaction.executed = false;
-            }
-        }
-    }
-
-    /** @dev Returns the confirmation status of a transaction.
-     * @param transactionId Transaction ID.
-     * @return Confirmation status.
-     */
-    function isConfirmed(uint256 transactionId) public view returns (bool) {
-        uint256 count = 0;
-
-        for (uint256 i = 0; i < owners.length; i++) {
-            if (confirmations[transactionId][owners[i]]) {
-                count += 1;
-            }
-
-            if (count >= required) {
-                return true;
-            }
-        }
-
-        return false;
-    }
-
-    /* Web3 call functions */
-
-    /** @dev Returns number of confirmations of a transaction.
-     * @param transactionId Transaction ID.
-     * @return Number of confirmations.
-     */
-    function getConfirmationCount(uint256 transactionId) external view returns (uint256 count) {
-        for (uint256 i = 0; i < owners.length; i++) {
-            if (confirmations[transactionId][owners[i]]) {
-                count += 1;
-            }
-        }
-    }
-
-    /** @dev Returns total number of transactions after filers are applied.
-     * @param pending Include pending transactions.
-     * @param executed Include executed transactions.
-     * @return Total number of transactions after filters are applied.
-     */
-    function getTransactionCount(bool pending, bool executed)
-        external
-        view
-        returns (uint256 count)
-    {
-        for (uint256 i = 0; i < transactionCount; i++) {
-            if ((pending && !transactions[i].executed) || (executed && transactions[i].executed)) {
-                count += 1;
-            }
-        }
-    }
-
-    /** @dev Returns list of owners.
-     * @return List of owner addresses.
-     */
-    function getOwners() external view returns (address[] memory) {
-        return owners;
-    }
-
-    /** @dev Returns array with owner addresses, which confirmed transaction.
-     * @param transactionId Transaction ID.
-     * @return Returns array of owner addresses.
-     */
-    function getConfirmations(uint256 transactionId)
-        external
-        view
-        returns (address[] memory _confirmations)
-    {
-        address[] memory confirmationsTemp = new address[](owners.length);
-        uint256 count = 0;
-        uint256 i;
-
-        for (i = 0; i < owners.length; i++) {
-            if (confirmations[transactionId][owners[i]]) {
-                confirmationsTemp[count] = owners[i];
-                count += 1;
-            }
-        }
-
-        _confirmations = new address[](count);
-
-        for (i = 0; i < count; i++) {
-            _confirmations[i] = confirmationsTemp[i];
-        }
-    }
-}