diff --git a/contracts/optimism/common/basic.sol b/contracts/optimism/common/basic.sol
new file mode 100644
index 0000000..101d2d8
--- /dev/null
+++ b/contracts/optimism/common/basic.sol
@@ -0,0 +1,59 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.8.2;
+
+import { TokenInterface } from "./interfaces.sol";
+import { Stores } from "./stores.sol";
+import { DSMath } from "./math.sol";
+
+abstract contract Basic is DSMath, Stores {
+
+    function convert18ToDec(uint _dec, uint256 _amt) internal pure returns (uint256 amt) {
+        amt = (_amt / 10 ** (18 - _dec));
+    }
+
+    function convertTo18(uint _dec, uint256 _amt) internal pure returns (uint256 amt) {
+        amt = mul(_amt, 10 ** (18 - _dec));
+    }
+
+    function getTokenBal(TokenInterface token) internal view returns(uint _amt) {
+        _amt = address(token) == ethAddr ? address(this).balance : token.balanceOf(address(this));
+    }
+
+    function getTokensDec(TokenInterface buyAddr, TokenInterface sellAddr) internal view returns(uint buyDec, uint sellDec) {
+        buyDec = address(buyAddr) == ethAddr ?  18 : buyAddr.decimals();
+        sellDec = address(sellAddr) == ethAddr ?  18 : sellAddr.decimals();
+    }
+
+    function encodeEvent(string memory eventName, bytes memory eventParam) internal pure returns (bytes memory) {
+        return abi.encode(eventName, eventParam);
+    }
+
+    function approve(TokenInterface token, address spender, uint256 amount) internal {
+        try token.approve(spender, amount) {
+
+        } catch {
+            token.approve(spender, 0);
+            token.approve(spender, amount);
+        }
+    }
+
+    function changeEthAddress(address buy, address sell) internal pure returns(TokenInterface _buy, TokenInterface _sell){
+        _buy = buy == ethAddr ? TokenInterface(wethAddr) : TokenInterface(buy);
+        _sell = sell == ethAddr ? TokenInterface(wethAddr) : TokenInterface(sell);
+    }
+
+    function changeEthAddrToWethAddr(address token) internal pure returns(address tokenAddr){
+        tokenAddr = token == ethAddr ? wethAddr : token;
+    }
+
+    function convertEthToWeth(bool isEth, TokenInterface token, uint amount) internal {
+        if(isEth) token.deposit{value: amount}();
+    }
+
+    function convertWethToEth(bool isEth, TokenInterface token, uint amount) internal {
+       if(isEth) {
+            approve(token, address(token), amount);
+            token.withdraw(amount);
+        }
+    }
+}
diff --git a/contracts/optimism/common/interfaces.sol b/contracts/optimism/common/interfaces.sol
new file mode 100644
index 0000000..23c630d
--- /dev/null
+++ b/contracts/optimism/common/interfaces.sol
@@ -0,0 +1,43 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.8.2;
+
+interface TokenInterface {
+    function approve(address, uint256) external;
+    function transfer(address, uint) external;
+    function transferFrom(address, address, uint) external;
+    function deposit() external payable;
+    function withdraw(uint) external;
+    function balanceOf(address) external view returns (uint);
+    function decimals() external view returns (uint);
+    function totalSupply() external view returns (uint);
+    function allowance(address owner, address spender) external view returns (uint256);
+}
+
+interface MemoryInterface {
+    function getUint(uint id) external returns (uint num);
+    function setUint(uint id, uint val) external;
+}
+
+interface InstaMapping {
+    function cTokenMapping(address) external view returns (address);
+    function gemJoinMapping(bytes32) external view returns (address);
+}
+
+interface AccountInterface {
+    function enable(address) external;
+    function disable(address) external;
+    function isAuth(address) external view returns (bool);
+    function cast(
+        string[] calldata _targetNames,
+        bytes[] calldata _datas,
+        address _origin
+    ) external payable returns (bytes32[] memory responses);
+}
+
+interface ListInterface {
+    function accountID(address) external returns (uint64);
+}
+
+interface InstaConnectors {
+    function isConnectors(string[] calldata) external returns (bool, address[] memory);
+}
\ No newline at end of file
diff --git a/contracts/optimism/common/math.sol b/contracts/optimism/common/math.sol
new file mode 100644
index 0000000..52c8d4e
--- /dev/null
+++ b/contracts/optimism/common/math.sol
@@ -0,0 +1,56 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.8.2;
+
+import { SafeMath } from "@openzeppelin/contracts/utils/math/SafeMath.sol";
+
+contract DSMath {
+  uint constant WAD = 10 ** 18;
+  uint constant RAY = 10 ** 27;
+
+  function add(uint x, uint y) internal pure returns (uint z) {
+    z = SafeMath.add(x, y);
+  }
+
+  function sub(uint x, uint y) internal virtual pure returns (uint z) {
+    z = SafeMath.sub(x, y);
+  }
+
+  function mul(uint x, uint y) internal pure returns (uint z) {
+    z = SafeMath.mul(x, y);
+  }
+
+  function div(uint x, uint y) internal pure returns (uint z) {
+    z = SafeMath.div(x, y);
+  }
+
+  function wmul(uint x, uint y) internal pure returns (uint z) {
+    z = SafeMath.add(SafeMath.mul(x, y), WAD / 2) / WAD;
+  }
+
+  function wdiv(uint x, uint y) internal pure returns (uint z) {
+    z = SafeMath.add(SafeMath.mul(x, WAD), y / 2) / y;
+  }
+
+  function rdiv(uint x, uint y) internal pure returns (uint z) {
+    z = SafeMath.add(SafeMath.mul(x, RAY), y / 2) / y;
+  }
+
+  function rmul(uint x, uint y) internal pure returns (uint z) {
+    z = SafeMath.add(SafeMath.mul(x, y), RAY / 2) / RAY;
+  }
+
+  function toInt(uint x) internal pure returns (int y) {
+    y = int(x);
+    require(y >= 0, "int-overflow");
+  }
+
+  function toUint(int256 x) internal pure returns (uint256) {
+      require(x >= 0, "int-overflow");
+      return uint256(x);
+  }
+
+  function toRad(uint wad) internal pure returns (uint rad) {
+    rad = mul(wad, 10 ** 27);
+  }
+
+}
\ No newline at end of file
diff --git a/contracts/optimism/common/stores.sol b/contracts/optimism/common/stores.sol
new file mode 100644
index 0000000..7b84685
--- /dev/null
+++ b/contracts/optimism/common/stores.sol
@@ -0,0 +1,53 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.8.2;
+
+import { MemoryInterface, InstaMapping, ListInterface, InstaConnectors } from "./interfaces.sol";
+
+
+abstract contract Stores {
+
+  /**
+   * @dev Return ethereum address
+   */
+  address constant internal ethAddr = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
+
+  /**
+   * @dev Return Wrapped ETH address
+   */
+  address constant internal wethAddr = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
+
+  /**
+   * @dev Return memory variable address
+   */
+  MemoryInterface constant internal instaMemory = MemoryInterface(0x8a5419CfC711B2343c17a6ABf4B2bAFaBb06957F);
+
+  /**
+   * @dev Return InstaDApp Mapping Addresses
+   */
+  InstaMapping constant internal instaMapping = InstaMapping(0xe81F70Cc7C0D46e12d70efc60607F16bbD617E88);
+
+  /**
+   * @dev Return InstaList Address
+   */
+  ListInterface internal constant instaList = ListInterface(0x4c8a1BEb8a87765788946D6B19C6C6355194AbEb);
+
+  /**
+	 * @dev Return connectors registry address
+	 */
+	InstaConnectors internal constant instaConnectors = InstaConnectors(0x97b0B3A8bDeFE8cB9563a3c610019Ad10DB8aD11);
+
+  /**
+   * @dev Get Uint value from InstaMemory Contract.
+   */
+  function getUint(uint getId, uint val) internal returns (uint returnVal) {
+    returnVal = getId == 0 ? val : instaMemory.getUint(getId);
+  }
+
+  /**
+  * @dev Set Uint value in InstaMemory Contract.
+  */
+  function setUint(uint setId, uint val) virtual internal {
+    if (setId != 0) instaMemory.setUint(setId, val);
+  }
+
+}
\ No newline at end of file
diff --git a/contracts/optimism/connectors/compound/v3/events.sol b/contracts/optimism/connectors/compound/v3/events.sol
new file mode 100644
index 0000000..a26a551
--- /dev/null
+++ b/contracts/optimism/connectors/compound/v3/events.sol
@@ -0,0 +1,165 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.8.2;
+
+contract Events {
+	event LogDeposit(
+		address indexed market,
+		address indexed token,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogDepositOnBehalf(
+		address indexed market,
+		address indexed token,
+		address to,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogDepositFromUsingManager(
+		address indexed market,
+		address indexed token,
+		address from,
+		address to,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogWithdraw(
+		address indexed market,
+		address indexed token,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogWithdrawTo(
+		address indexed market,
+		address indexed token,
+		address to,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogWithdrawOnBehalf(
+		address indexed market,
+		address indexed token,
+		address from,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogWithdrawOnBehalfAndTransfer(
+		address indexed market,
+		address indexed token,
+		address from,
+		address to,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogBorrow(
+		address indexed market,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogBorrowTo(
+		address indexed market,
+		address to,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogBorrowOnBehalf(
+		address indexed market,
+		address from,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogBorrowOnBehalfAndTransfer(
+		address indexed market,
+		address from,
+		address to,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogPayback(address indexed market, uint256 tokenAmt, uint256 getId, uint256 setId);
+
+	event LogPaybackOnBehalf(
+		address indexed market,
+		address to,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogPaybackFromUsingManager(
+		address indexed market,
+		address from,
+		address to,
+		uint256 tokenAmt,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogBuyCollateral(
+		address indexed market,
+		address indexed buyToken,
+		uint256 indexed baseSellAmt,
+		uint256 unitAmt,
+		uint256 buyAmount,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogTransferAsset(
+		address indexed market,
+		address token,
+		address indexed dest,
+		uint256 amount,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogTransferAssetOnBehalf(
+		address indexed market,
+		address token,
+		address indexed from,
+		address indexed dest,
+		uint256 amount,
+		uint256 getId,
+		uint256 setId
+	);
+
+	event LogToggleAccountManager(
+		address indexed market,
+		address indexed manager,
+		bool allow
+	);
+
+	event LogToggleAccountManagerWithPermit(
+		address indexed market,
+		address indexed owner,
+		address indexed manager,
+		bool allow,
+		uint256 expiry,
+		uint256 nonce,
+		uint8 v,
+		bytes32 r,
+		bytes32 s
+	);
+}
diff --git a/contracts/optimism/connectors/compound/v3/helpers.sol b/contracts/optimism/connectors/compound/v3/helpers.sol
new file mode 100644
index 0000000..5889577
--- /dev/null
+++ b/contracts/optimism/connectors/compound/v3/helpers.sol
@@ -0,0 +1,273 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.8.2;
+pragma abicoder v2;
+
+import { TokenInterface } from "../../../common/interfaces.sol";
+import { DSMath } from "../../../common/math.sol";
+import { Basic } from "../../../common/basic.sol";
+import { CometInterface } from "./interface.sol";
+
+abstract contract Helpers is DSMath, Basic {
+	struct BorrowWithdrawParams {
+		address market;
+		address token;
+		address from;
+		address to;
+		uint256 amt;
+		uint256 getId;
+		uint256 setId;
+	}
+
+	struct BuyCollateralData {
+		address market;
+		address sellToken;
+		address buyAsset;
+		uint256 unitAmt;
+		uint256 baseSellAmt;
+	}
+
+	enum Action {
+		REPAY,
+		DEPOSIT
+	}
+
+	function getBaseToken(address market)
+		internal
+		view
+		returns (address baseToken)
+	{
+		baseToken = CometInterface(market).baseToken();
+	}
+
+	function _borrow(BorrowWithdrawParams memory params)
+		internal
+		returns (uint256 amt, uint256 setId)
+	{
+		uint256 amt_ = getUint(params.getId, params.amt);
+
+		require(
+			params.market != address(0) &&
+				params.token != address(0) &&
+				params.to != address(0),
+			"invalid market/token/to address"
+		);
+		bool isEth = params.token == ethAddr;
+		address token_ = isEth ? wethAddr : params.token;
+
+		TokenInterface tokenContract = TokenInterface(token_);
+
+		params.from = params.from == address(0) ? address(this) : params.from;
+
+		require(
+			CometInterface(params.market).balanceOf(params.from) == 0,
+			"borrow-disabled-when-supplied-base"
+		);
+
+		uint256 initialBal = CometInterface(params.market).borrowBalanceOf(
+			params.from
+		);
+
+		CometInterface(params.market).withdrawFrom(
+			params.from,
+			params.to,
+			token_,
+			amt_
+		);
+
+		uint256 finalBal = CometInterface(params.market).borrowBalanceOf(
+			params.from
+		);
+		amt_ = sub(finalBal, initialBal);
+
+		if (params.to == address(this))
+			convertWethToEth(isEth, tokenContract, amt_);
+
+		setUint(params.setId, amt_);
+
+		amt = amt_;
+		setId = params.setId;
+	}
+
+	function _withdraw(BorrowWithdrawParams memory params)
+		internal
+		returns (uint256 amt, uint256 setId)
+	{
+		uint256 amt_ = getUint(params.getId, params.amt);
+
+		require(
+			params.market != address(0) &&
+				params.token != address(0) &&
+				params.to != address(0),
+			"invalid market/token/to address"
+		);
+
+		bool isEth = params.token == ethAddr;
+		address token_ = isEth ? wethAddr : params.token;
+
+		TokenInterface tokenContract = TokenInterface(token_);
+		params.from = params.from == address(0) ? address(this) : params.from;
+
+		uint256 initialBal = _getAccountSupplyBalanceOfAsset(
+			params.from,
+			params.market,
+			token_
+		);
+
+		if (token_ == getBaseToken(params.market)) {
+			//if there are supplies, ensure withdrawn amount is not greater than supplied i.e can't borrow using withdraw.
+			if (amt_ == type(uint256).max) {
+				amt_ = initialBal;
+			} else {
+				require(
+					amt_ <= initialBal,
+					"withdraw-amt-greater-than-supplies"
+				);
+			}
+
+			//if borrow balance > 0, there are no supplies so no withdraw, borrow instead.
+			require(
+				CometInterface(params.market).borrowBalanceOf(params.from) == 0,
+				"withdraw-disabled-for-zero-supplies"
+			);
+		} else {
+			amt_ = amt_ == type(uint256).max ? initialBal : amt_;
+		}
+
+		CometInterface(params.market).withdrawFrom(
+			params.from,
+			params.to,
+			token_,
+			amt_
+		);
+
+		uint256 finalBal = _getAccountSupplyBalanceOfAsset(
+			params.from,
+			params.market,
+			token_
+		);
+		amt_ = sub(initialBal, finalBal);
+
+		if (params.to == address(this))
+			convertWethToEth(isEth, tokenContract, amt_);
+
+		setUint(params.setId, amt_);
+
+		amt = amt_;
+		setId = params.setId;
+	}
+
+	function _getAccountSupplyBalanceOfAsset(
+		address account,
+		address market,
+		address asset
+	) internal returns (uint256 balance) {
+		if (asset == getBaseToken(market)) {
+			//balance in base
+			balance = CometInterface(market).balanceOf(account);
+		} else {
+			//balance in asset denomination
+			balance = uint256(
+				CometInterface(market).userCollateral(account, asset).balance
+			);
+		}
+	}
+
+	function _calculateFromAmount(
+		address market,
+		address token,
+		address src,
+		uint256 amt,
+		bool isEth,
+		Action action
+	) internal view returns (uint256) {
+		if (amt == type(uint256).max) {
+			uint256 allowance_ = TokenInterface(token).allowance(src, market);
+			uint256 bal_;
+
+			if (action == Action.REPAY) {
+				bal_ = CometInterface(market).borrowBalanceOf(src);
+			} else if (action == Action.DEPOSIT) {
+				if (isEth) bal_ = src.balance;
+				else bal_ = TokenInterface(token).balanceOf(src);
+			}
+
+			amt = bal_ < allowance_ ? bal_ : allowance_;
+		}
+
+		return amt;
+	}
+
+	function _buyCollateral(
+		BuyCollateralData memory params,
+		uint256 getId,
+		uint256 setId
+	) internal returns (string memory eventName_, bytes memory eventParam_) {
+		uint256 sellAmt_ = getUint(getId, params.baseSellAmt);
+		require(
+			params.market != address(0) && params.buyAsset != address(0),
+			"invalid market/token address"
+		);
+
+		bool isEth = params.sellToken == ethAddr;
+		params.sellToken = isEth ? wethAddr : params.sellToken;
+
+		require(
+			params.sellToken == getBaseToken(params.market),
+			"invalid-sell-token"
+		);
+
+		if (sellAmt_ == type(uint256).max) {
+			sellAmt_ = isEth
+				? address(this).balance
+				: TokenInterface(params.sellToken).balanceOf(address(this));
+		}
+		convertEthToWeth(isEth, TokenInterface(params.sellToken), sellAmt_);
+
+		isEth = params.buyAsset == ethAddr;
+		params.buyAsset = isEth ? wethAddr : params.buyAsset;
+
+		uint256 slippageAmt_ = convert18ToDec(
+			TokenInterface(params.buyAsset).decimals(),
+			wmul(
+				params.unitAmt,
+				convertTo18(
+					TokenInterface(params.sellToken).decimals(),
+					sellAmt_
+				)
+			)
+		);
+
+		uint256 initialCollBal_ = TokenInterface(params.buyAsset).balanceOf(
+			address(this)
+		);
+
+		approve(TokenInterface(params.sellToken), params.market, sellAmt_);
+		CometInterface(params.market).buyCollateral(
+			params.buyAsset,
+			slippageAmt_,
+			sellAmt_,
+			address(this)
+		);
+
+		uint256 finalCollBal_ = TokenInterface(params.buyAsset).balanceOf(
+			address(this)
+		);
+
+		uint256 buyAmt_ = sub(finalCollBal_, initialCollBal_);
+		require(slippageAmt_ <= buyAmt_, "too-much-slippage");
+
+		convertWethToEth(isEth, TokenInterface(params.buyAsset), buyAmt_);
+		setUint(setId, sellAmt_);
+
+		eventName_ = "LogBuyCollateral(address,address,uint256,uint256,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(
+			params.market,
+			params.buyAsset,
+			sellAmt_,
+			params.unitAmt,
+			buyAmt_,
+			getId,
+			setId
+		);
+	}
+}
diff --git a/contracts/optimism/connectors/compound/v3/interface.sol b/contracts/optimism/connectors/compound/v3/interface.sol
new file mode 100644
index 0000000..0db3cec
--- /dev/null
+++ b/contracts/optimism/connectors/compound/v3/interface.sol
@@ -0,0 +1,105 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.8.2;
+pragma abicoder v2;
+
+struct UserCollateral {
+    uint128 balance;
+    uint128 _reserved;
+}
+
+struct RewardOwed {
+    address token;
+    uint256 owed;
+}
+
+interface CometInterface {
+    function supply(address asset, uint256 amount) external;
+
+    function supplyTo(address dst, address asset, uint256 amount) external;
+
+    function supplyFrom(
+        address from,
+        address dst,
+        address asset,
+        uint256 amount
+    ) external;
+
+    function transfer(address dst, uint256 amount) external returns (bool);
+
+    function transferFrom(
+        address src,
+        address dst,
+        uint256 amount
+    ) external returns (bool);
+
+    function transferAsset(address dst, address asset, uint256 amount) external;
+
+    function transferAssetFrom(
+        address src,
+        address dst,
+        address asset,
+        uint256 amount
+    ) external;
+
+    function withdraw(address asset, uint256 amount) external;
+
+    function withdrawTo(address to, address asset, uint256 amount) external;
+
+    function withdrawFrom(
+        address src,
+        address to,
+        address asset,
+        uint256 amount
+    ) external;
+
+    function approveThis(
+        address manager,
+        address asset,
+        uint256 amount
+    ) external;
+
+    function withdrawReserves(address to, uint256 amount) external;
+
+    function absorb(address absorber, address[] calldata accounts) external;
+
+    function buyCollateral(
+        address asset,
+        uint256 minAmount,
+        uint256 baseAmount,
+        address recipient
+    ) external;
+
+    function quoteCollateral(
+        address asset,
+        uint256 baseAmount
+    ) external view returns (uint256);
+
+    function userCollateral(
+        address,
+        address
+    ) external returns (UserCollateral memory);
+
+    function baseToken() external view returns (address);
+
+    function balanceOf(address account) external view returns (uint256);
+
+    function borrowBalanceOf(address account) external view returns (uint256);
+
+    function allow(address manager, bool isAllowed_) external;
+
+    function allowance(
+        address owner,
+        address spender
+    ) external view returns (uint256);
+
+    function allowBySig(
+        address owner,
+        address manager,
+        bool isAllowed_,
+        uint256 nonce,
+        uint256 expiry,
+        uint8 v,
+        bytes32 r,
+        bytes32 s
+    ) external;
+}
diff --git a/contracts/optimism/connectors/compound/v3/main.sol b/contracts/optimism/connectors/compound/v3/main.sol
new file mode 100644
index 0000000..d227631
--- /dev/null
+++ b/contracts/optimism/connectors/compound/v3/main.sol
@@ -0,0 +1,934 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.8.2;
+pragma experimental ABIEncoderV2;
+
+/**
+ * @title Compound III
+ * @dev Lending & Borrowing.
+ */
+
+import { TokenInterface } from "../../../common/interfaces.sol";
+import { Helpers } from "./helpers.sol";
+import { Events } from "./events.sol";
+import { CometInterface } from "./interface.sol";
+
+abstract contract CompoundV3Resolver is Events, Helpers {
+	/**
+	 * @dev Deposit base asset or collateral asset supported by the market.
+	 * @notice Deposit a token to Compound for lending / collaterization.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be supplied. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param amt The amount of the token to deposit. (For max: `type(uint256).max`)
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens deposited.
+	 */
+	function deposit(
+		address market,
+		address token,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		public
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		uint256 amt_ = getUint(getId, amt);
+
+		require(
+			market != address(0) && token != address(0),
+			"invalid market/token address"
+		);
+
+		bool isEth = token == ethAddr;
+		address token_ = isEth ? wethAddr : token;
+		TokenInterface tokenContract = TokenInterface(token_);
+
+		if (token_ == getBaseToken(market)) {
+			require(
+				CometInterface(market).borrowBalanceOf(address(this)) == 0,
+				"debt-not-repaid"
+			);
+		}
+
+		if (isEth) {
+			amt_ = amt_ == type(uint256).max ? address(this).balance : amt_;
+			convertEthToWeth(isEth, tokenContract, amt_);
+		} else {
+			amt_ = amt_ == type(uint256).max
+				? tokenContract.balanceOf(address(this))
+				: amt_;
+		}
+		approve(tokenContract, market, amt_);
+
+		CometInterface(market).supply(token_, amt_);
+
+		setUint(setId, amt_);
+
+		eventName_ = "LogDeposit(address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, token, amt_, getId, setId);
+	}
+
+	/**
+	 * @dev Deposit base asset or collateral asset supported by the market on behalf of 'to'.
+	 * @notice Deposit a token to Compound for lending / collaterization on behalf of 'to'.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be supplied. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE).
+	 * @param to The address on behalf of which the supply is made.
+	 * @param amt The amount of the token to deposit. (For max: `type(uint256).max`)
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens deposited.
+	 */
+	function depositOnBehalf(
+		address market,
+		address token,
+		address to,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		public
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		uint256 amt_ = getUint(getId, amt);
+
+		require(
+			market != address(0) && token != address(0) && to != address(0),
+			"invalid market/token/to address"
+		);
+
+		bool isEth = token == ethAddr;
+		address token_ = isEth ? wethAddr : token;
+		TokenInterface tokenContract = TokenInterface(token_);
+
+		if (token_ == getBaseToken(market)) {
+			require(
+				CometInterface(market).borrowBalanceOf(to) == 0,
+				"to-address-position-debt-not-repaid"
+			);
+		}
+
+		if (isEth) {
+			amt_ = amt_ == type(uint256).max ? address(this).balance : amt_;
+			convertEthToWeth(isEth, tokenContract, amt_);
+		} else {
+			amt_ = amt_ == type(uint256).max
+				? tokenContract.balanceOf(address(this))
+				: amt_;
+		}
+		approve(tokenContract, market, amt_);
+
+		CometInterface(market).supplyTo(to, token_, amt_);
+
+		setUint(setId, amt_);
+
+		eventName_ = "LogDepositOnBehalf(address,address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, token, to, amt_, getId, setId);
+	}
+
+	/**
+	 * @dev Deposit base asset or collateral asset supported by the market from 'from' address and update the position of 'to'.
+	 * @notice Deposit a token to Compound for lending / collaterization from a address and update the position of 'to'.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be supplied. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param from The address from where amount is to be supplied.
+	 * @param to The address on account of which the supply is made or whose positions are updated.
+	 * @param amt The amount of the token to deposit. (For max: `type(uint256).max`)
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens deposited.
+	 */
+	function depositFromUsingManager(
+		address market,
+		address token,
+		address from,
+		address to,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		public
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		uint256 amt_ = getUint(getId, amt);
+
+		require(
+			market != address(0) && token != address(0) && to != address(0),
+			"invalid market/token/to address"
+		);
+		require(from != address(this), "from-cannot-be-address(this)-use-depositOnBehalf");
+
+		bool isEth = token == ethAddr;
+		address token_ = isEth? wethAddr : token;
+
+		if (token_ == getBaseToken(market)) {
+			require(
+				CometInterface(market).borrowBalanceOf(to) == 0,
+				"to-address-position-debt-not-repaid"
+			);
+		}
+
+		amt_ = _calculateFromAmount(
+			market,
+			token_,
+			from,
+			amt_,
+			isEth,
+			Action.DEPOSIT
+		);
+
+		CometInterface(market).supplyFrom(from, to, token_, amt_);
+		setUint(setId, amt_);
+
+		eventName_ = "LogDepositFromUsingManager(address,address,address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, token, from, to, amt_, getId, setId);
+	}
+
+	/**
+	 * @dev Withdraw base/collateral asset.
+	 * @notice Withdraw base token or deposited token from Compound.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be withdrawn. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param amt The amount of the token to withdraw. (For max: `type(uint256).max`)
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens withdrawn.
+	 */
+	function withdraw(
+		address market,
+		address token,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		public
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		uint256 amt_ = getUint(getId, amt);
+
+		require(
+			market != address(0) && token != address(0),
+			"invalid market/token address"
+		);
+
+		bool isEth = token == ethAddr;
+		address token_ = isEth ? wethAddr : token;
+
+		TokenInterface tokenContract = TokenInterface(token_);
+
+		uint256 initialBal = _getAccountSupplyBalanceOfAsset(
+			address(this),
+			market,
+			token_
+		);
+
+		if (token_ == getBaseToken(market)) {
+			if (amt_ == type(uint256).max) {
+				amt_ = initialBal;
+			} else {
+				//if there are supplies, ensure withdrawn amount is not greater than supplied i.e can't borrow using withdraw.
+				require(amt_ <= initialBal, "withdraw-amt-greater-than-supplies");
+			}
+
+			//if borrow balance > 0, there are no supplies so no withdraw, borrow instead.
+			require(
+				CometInterface(market).borrowBalanceOf(address(this)) == 0,
+				"withdraw-disabled-for-zero-supplies"
+			);
+		} else {
+			amt_ = amt_ == type(uint256).max ? initialBal : amt_;
+		}
+
+		CometInterface(market).withdraw(token_, amt_);
+
+		uint256 finalBal = _getAccountSupplyBalanceOfAsset(
+			address(this),
+			market,
+			token_
+		);
+
+		amt_ = sub(initialBal, finalBal);
+
+		convertWethToEth(isEth, tokenContract, amt_);
+
+		setUint(setId, amt_);
+
+		eventName_ = "LogWithdraw(address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, token, amt_, getId, setId);
+	}
+
+	/**
+	 * @dev Withdraw base/collateral asset and transfer to 'to'.
+	 * @notice Withdraw base token or deposited token from Compound on behalf of an address and transfer to 'to'.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be withdrawn. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param to The address to which the borrowed assets are to be transferred.
+	 * @param amt The amount of the token to withdraw. (For max: `type(uint256).max`)
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens withdrawn.
+	 */
+	function withdrawTo(
+		address market,
+		address token,
+		address to,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		public
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		(uint256 amt_, uint256 setId_) = _withdraw(
+			BorrowWithdrawParams({
+				market: market,
+				token: token,
+				from: address(this),
+				to: to,
+				amt: amt,
+				getId: getId,
+				setId: setId
+			})
+		);
+
+		eventName_ = "LogWithdrawTo(address,address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, token, to, amt_, getId, setId_);
+	}
+
+	/**
+	 * @dev Withdraw base/collateral asset from an account and transfer to DSA.
+	 * @notice Withdraw base token or deposited token from Compound from an address and transfer to DSA.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be withdrawn. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param from The address from where asset is to be withdrawed.
+	 * @param amt The amount of the token to withdraw. (For max: `type(uint256).max`)
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens withdrawn.
+	 */
+	function withdrawOnBehalf(
+		address market,
+		address token,
+		address from,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		public
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		(uint256 amt_, uint256 setId_) = _withdraw(
+			BorrowWithdrawParams({
+				market: market,
+				token: token,
+				from: from,
+				to: address(this),
+				amt: amt,
+				getId: getId,
+				setId: setId
+			})
+		);
+
+		eventName_ = "LogWithdrawOnBehalf(address,address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, token, from, amt_, getId, setId_);
+	}
+
+	/**
+	 * @dev Withdraw base/collateral asset from an account and transfer to 'to'.
+	 * @notice Withdraw base token or deposited token from Compound from an address and transfer to 'to'.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be withdrawn. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param from The address from where asset is to be withdrawed.
+	 * @param to The address to which the borrowed assets are to be transferred.
+	 * @param amt The amount of the token to withdraw. (For max: `type(uint256).max`)
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens withdrawn.
+	 */
+	function withdrawOnBehalfAndTransfer(
+		address market,
+		address token,
+		address from,
+		address to,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		public
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		(uint256 amt_, uint256 setId_) = _withdraw(
+			BorrowWithdrawParams({
+				market: market,
+				token: token,
+				from: from,
+				to: to,
+				amt: amt,
+				getId: getId,
+				setId: setId
+			})
+		);
+
+		eventName_ = "LogWithdrawOnBehalfAndTransfer(address,address,address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, token, from, to, amt_, getId, setId_);
+	}
+
+	/**
+	 * @dev Borrow base asset.
+	 * @notice Borrow base token from Compound.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be borrowed. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param amt The amount of base token to borrow.
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens borrowed.
+	 */
+	function borrow(
+		address market,
+		address token,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		uint256 amt_ = getUint(getId, amt);
+
+		require(market != address(0), "invalid market address");
+
+		bool isEth = token == ethAddr;
+		address token_ = getBaseToken(market);
+		require(token == token_ || isEth, "invalid-token");
+
+		TokenInterface tokenContract = TokenInterface(token_);
+
+		require(
+			CometInterface(market).balanceOf(address(this)) == 0,
+			"borrow-disabled-when-supplied-base"
+		);
+
+		uint256 initialBal = CometInterface(market).borrowBalanceOf(
+			address(this)
+		);
+
+		CometInterface(market).withdraw(token_, amt_);
+
+		uint256 finalBal = CometInterface(market).borrowBalanceOf(
+			address(this)
+		);
+
+		amt_ = sub(finalBal, initialBal);
+
+		convertWethToEth(isEth, tokenContract, amt_);
+
+		setUint(setId, amt_);
+
+		eventName_ = "LogBorrow(address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, amt_, getId, setId);
+	}
+
+	/**
+	 * @dev Borrow base asset and transfer to 'to' account.
+	 * @notice Borrow base token from Compound on behalf of an address.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be borrowed. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param to The address to which the borrowed asset is transferred.
+	 * @param amt The amount of the token to withdraw. (For max: `type(uint256).max`)
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens borrowed.
+	 */
+	function borrowTo(
+		address market,
+		address token,
+		address to,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		require(
+			token == ethAddr || token == getBaseToken(market),
+			"invalid-token"
+		);
+		(uint256 amt_, uint256 setId_) = _borrow(
+			BorrowWithdrawParams({
+				market: market,
+				token: token,
+				from: address(this),
+				to: to,
+				amt: amt,
+				getId: getId,
+				setId: setId
+			})
+		);
+		eventName_ = "LogBorrowTo(address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, to, amt_, getId, setId_);
+	}
+
+	/**
+	 * @dev Borrow base asset from 'from' and transfer to 'to'.
+	 * @notice Borrow base token or deposited token from Compound.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be borrowed. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param amt The amount of the token to withdraw. (For max: `type(uint256).max`)
+	 * @param from The address from where asset is to be withdrawed.
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens borrowed.
+	 */
+	function borrowOnBehalf(
+		address market,
+		address token,
+		address from,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		require(
+			token == ethAddr || token == getBaseToken(market),
+			"invalid-token"
+		);
+		(uint256 amt_, uint256 setId_) = _borrow(
+			BorrowWithdrawParams({
+				market: market,
+				token: token,
+				from: from,
+				to: address(this),
+				amt: amt,
+				getId: getId,
+				setId: setId
+			})
+		);
+		eventName_ = "LogBorrowOnBehalf(address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, from, amt_, getId, setId_);
+	}
+
+	/**
+	 * @dev Borrow base asset from 'from' and transfer to 'to'.
+	 * @notice Borrow base token or deposited token from Compound.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be borrowed. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param amt The amount of the token to withdraw. (For max: `type(uint256).max`)
+	 * @param from The address from where asset is to be withdrawed.
+	 * @param to The address to which the borrowed assets are to be transferred.
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens borrowed.
+	 */
+	function borrowOnBehalfAndTransfer(
+		address market,
+		address token,
+		address from,
+		address to,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		require(
+			token == ethAddr || token == getBaseToken(market),
+			"invalid-token"
+		);
+		(uint256 amt_, uint256 setId_) = _borrow(
+			BorrowWithdrawParams({
+				market: market,
+				token: token,
+				from: from,
+				to: to,
+				amt: amt,
+				getId: getId,
+				setId: setId
+			})
+		);
+		eventName_ = "LogBorrowOnBehalfAndTransfer(address,address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, from, to, amt_, getId, setId_);
+	}
+
+	/**
+	 * @dev Repays the borrowed base asset.
+	 * @notice Repays the borrow of the base asset.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be repaid. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param amt The amount to be repaid.
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens repaid.
+	 */
+	function payback(
+		address market,
+		address token,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		uint256 amt_ = getUint(getId, amt);
+		require(
+			market != address(0) && token != address(0),
+			"invalid market/token address"
+		);
+
+		bool isEth = token == ethAddr;
+		address token_ = getBaseToken(market);
+		require(token == token_ || isEth, "invalid-token");
+
+		TokenInterface tokenContract = TokenInterface(token_);
+
+		uint256 borrowedBalance_ = CometInterface(market).borrowBalanceOf(
+			address(this)
+		);
+
+		if (amt_ == type(uint256).max) {
+			amt_ = borrowedBalance_;
+		} else {
+			require(
+				amt_ <= borrowedBalance_,
+				"payback-amt-greater-than-borrows"
+			);
+		}
+
+		//if supply balance > 0, there are no borrowing so no repay, supply instead.
+		require(
+			CometInterface(market).balanceOf(address(this)) == 0,
+			"cannot-repay-when-supplied"
+		);
+
+		convertEthToWeth(isEth, tokenContract, amt_);
+		approve(tokenContract, market, amt_);
+
+		CometInterface(market).supply(token_, amt_);
+
+		setUint(setId, amt_);
+
+		eventName_ = "LogPayback(address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, amt_, getId, setId);
+	}
+
+	/**
+	 * @dev Repays borrow of the base asset on behalf of 'to'.
+	 * @notice Repays borrow of the base asset on behalf of 'to'.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be repaid. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param to The address on behalf of which the borrow is to be repaid.
+	 * @param amt The amount to be repaid.
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens repaid.
+	 */
+	function paybackOnBehalf(
+		address market,
+		address token,
+		address to,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		uint256 amt_ = getUint(getId, amt);
+		require(
+			market != address(0) && token != address(0) && to != address(0),
+			"invalid market/token/to address"
+		);
+
+		address token_ = getBaseToken(market);
+		bool isEth = token == ethAddr;
+		require(token == token_ || isEth, "invalid-token");
+
+		TokenInterface tokenContract = TokenInterface(token_);
+
+		uint256 borrowedBalance_ = CometInterface(market).borrowBalanceOf(to);
+
+		if (amt_ == type(uint256).max) {
+			amt_ = borrowedBalance_;
+		} else {
+			require(
+				amt_ <= borrowedBalance_,
+				"payback-amt-greater-than-borrows"
+			);
+		}
+
+		//if supply balance > 0, there are no borrowing so no repay, supply instead.
+		require(
+			CometInterface(market).balanceOf(to) == 0,
+			"cannot-repay-when-supplied"
+		);
+
+		convertEthToWeth(isEth, tokenContract, amt_);
+		approve(tokenContract, market, amt_);
+
+		CometInterface(market).supplyTo(to, token_, amt_);
+
+		setUint(setId, amt_);
+
+		eventName_ = "LogPaybackOnBehalf(address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, to, amt_, getId, setId);
+	}
+
+	/**
+	 * @dev Repays borrow of the base asset form 'from' on behalf of 'to'.
+	 * @notice Repays borrow of the base asset on behalf of 'to'. 'From' address must approve the comet market.
+	 * @param market The address of the market.
+	 * @param token The address of the token to be repaid. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param from The address from which the borrow has to be repaid on behalf of 'to'.
+	 * @param to The address on behalf of which the borrow is to be repaid.
+	 * @param amt The amount to be repaid.
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens repaid.
+	 */
+	function paybackFromUsingManager(
+		address market,
+		address token,
+		address from,
+		address to,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		uint256 amt_ = getUint(getId, amt);
+		require(
+			market != address(0) && token != address(0) && to != address(0),
+			"invalid market/token/to address"
+		);
+		require(from != address(this), "from-cannot-be-address(this)-use-paybackOnBehalf");
+
+		address token_ = getBaseToken(market);
+		bool isEth = token == ethAddr;
+		require(token == token_ || isEth, "invalid-token");
+
+		if (amt_ == type(uint256).max) {
+			amt_ = _calculateFromAmount(
+				market,
+				token_,
+				from,
+				amt_,
+				isEth,
+				Action.REPAY
+			);
+		} else {
+			uint256 borrowedBalance_ = CometInterface(market).borrowBalanceOf(to);
+			require(
+				amt_ <= borrowedBalance_,
+				"payback-amt-greater-than-borrows"
+			);
+		}
+
+		//if supply balance > 0, there are no borrowing so no repay, withdraw instead.
+		require(
+			CometInterface(market).balanceOf(to) == 0,
+			"cannot-repay-when-supplied"
+		);
+
+		CometInterface(market).supplyFrom(from, to, token_, amt_);
+
+		setUint(setId, amt_);
+
+		eventName_ = "LogPaybackFromUsingManager(address,address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, from, to, amt_, getId, setId);
+	}
+
+	/**
+	 * @dev Buy collateral asset absorbed, from the market.
+	 * @notice Buy collateral asset to increase protocol base reserves until targetReserves is reached.
+	 * @param market The address of the market from where to withdraw.
+	 * @param sellToken base token. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param buyAsset The collateral asset to purachase. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param unitAmt Minimum amount of collateral expected to be received.
+	 * @param baseSellAmt Amount of base asset to be sold for collateral.
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of base tokens sold.
+	 */
+	function buyCollateral(
+		address market,
+		address sellToken,
+		address buyAsset,
+		uint256 unitAmt,
+		uint256 baseSellAmt,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		(eventName_, eventParam_) = _buyCollateral(
+			BuyCollateralData({
+				market: market,
+				sellToken: sellToken,
+				buyAsset: buyAsset,
+				unitAmt: unitAmt,
+				baseSellAmt: baseSellAmt
+			}),
+			getId,
+			setId
+		);
+	}
+
+	/**
+	 * @dev Transfer base/collateral or base asset to dest address from this account.
+	 * @notice Transfer base/collateral asset to dest address from caller's account.
+	 * @param market The address of the market.
+	 * @param token The collateral asset to transfer to dest address.
+	 * @param dest The account where to transfer the base assets.
+	 * @param amount The amount of the collateral token to transfer. (For max: `type(uint256).max`)
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens transferred.
+	 */
+	function transferAsset(
+		address market,
+		address token,
+		address dest,
+		uint256 amount,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		uint256 amt_ = getUint(getId, amount);
+		require(
+			market != address(0) && token != address(0) && dest != address(0),
+			"invalid market/token/to address"
+		);
+
+		address token_ = token == ethAddr ? wethAddr : token;
+
+		amt_ = amt_ == type(uint256).max ? _getAccountSupplyBalanceOfAsset(address(this), market, token) : amt_;
+
+		CometInterface(market).transferAssetFrom(address(this), dest, token_, amt_);
+
+		setUint(setId, amt_);
+
+		eventName_ = "LogTransferAsset(address,address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, token_, dest, amt_, getId, setId);
+	}
+
+	/**
+	 * @dev Transfer collateral or base asset to dest address from src account.
+	 * @notice Transfer collateral asset to dest address from src's account.
+	 * @param market The address of the market.
+	 * @param token The collateral asset to transfer to dest address.
+	 * @param src The account from where to transfer the collaterals.
+	 * @param dest The account where to transfer the collateral assets.
+	 * @param amount The amount of the collateral token to transfer. (For max: `type(uint256).max`)
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens transferred.
+	 */
+	function transferAssetOnBehalf(
+		address market,
+		address token,
+		address src,
+		address dest,
+		uint256 amount,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory eventName_, bytes memory eventParam_)
+	{
+		uint256 amt_ = getUint(getId, amount);
+		require(
+			market != address(0) && token != address(0) && dest != address(0),
+			"invalid market/token/to address"
+		);
+
+		address token_ = token == ethAddr ? wethAddr : token;
+
+		amt_ = amt_ == type(uint256).max ? _getAccountSupplyBalanceOfAsset(src, market, token) : amt_;
+
+		CometInterface(market).transferAssetFrom(src, dest, token_, amt_);
+
+		setUint(setId, amt_);
+
+		eventName_ = "LogTransferAssetOnBehalf(address,address,address,address,uint256,uint256,uint256)";
+		eventParam_ = abi.encode(market, token_, src, dest, amt_, getId, setId);
+	}
+
+	/**
+	 * @dev Allow/Disallow managers to handle position.
+	 * @notice Authorize/Remove managers to perform write operations for the position.
+	 * @param market The address of the market where to supply.
+	 * @param manager The address to be authorized.
+	 * @param isAllowed Whether to allow or disallow the manager.
+	 */
+	function toggleAccountManager(
+		address market,
+		address manager,
+		bool isAllowed
+	) external returns (string memory eventName_, bytes memory eventParam_) {
+		CometInterface(market).allow(manager, isAllowed);
+		eventName_ = "LogToggleAccountManager(address,address,bool)";
+		eventParam_ = abi.encode(market, manager, isAllowed);
+	}
+
+	/**
+	 * @dev Allow/Disallow managers to handle owner's position.
+	 * @notice Authorize/Remove managers to perform write operations for owner's position.
+	 * @param market The address of the market where to supply.
+	 * @param owner The authorizind owner account.
+	 * @param manager The address to be authorized.
+	 * @param isAllowed Whether to allow or disallow the manager.
+	 * @param nonce Signer's nonce.
+	 * @param expiry The duration for which to permit the manager.
+	 * @param v Recovery byte of the signature.
+	 * @param r Half of the ECDSA signature pair.
+	 * @param s Half of the ECDSA signature pair.
+	 */
+	function toggleAccountManagerWithPermit(
+		address market,
+		address owner,
+		address manager,
+		bool isAllowed,
+		uint256 nonce,
+		uint256 expiry,
+		uint8 v,
+		bytes32 r,
+		bytes32 s
+	) external returns (string memory eventName_, bytes memory eventParam_) {
+		CometInterface(market).allowBySig(
+			owner,
+			manager,
+			isAllowed,
+			nonce,
+			expiry,
+			v,
+			r,
+			s
+		);
+		eventName_ = "LogToggleAccountManagerWithPermit(address,address,address,bool,uint256,uint256,uint8,bytes32,bytes32)";
+		eventParam_ = abi.encode(
+			market,
+			owner,
+			manager,
+			isAllowed,
+			expiry,
+			nonce,
+			v,
+			r,
+			s
+		);
+	}
+}
+
+contract ConnectV2CompoundV3Optimism is CompoundV3Resolver {
+	string public name = "CompoundV3-v1.0";
+}