diff --git a/contracts/arbitrum/connectors/dexSimulation/events.sol b/contracts/arbitrum/connectors/dexSimulation/events.sol
new file mode 100644
index 00000000..083afebe
--- /dev/null
+++ b/contracts/arbitrum/connectors/dexSimulation/events.sol
@@ -0,0 +1,11 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+contract Events {
+	event LogSimulateSwap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount
+	);
+}
diff --git a/contracts/arbitrum/connectors/dexSimulation/helpers.sol b/contracts/arbitrum/connectors/dexSimulation/helpers.sol
new file mode 100644
index 00000000..65c56bcf
--- /dev/null
+++ b/contracts/arbitrum/connectors/dexSimulation/helpers.sol
@@ -0,0 +1,15 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+import "./interfaces.sol";
+import { Basic } from "../../common/basic.sol";
+import { TokenInterface } from "../../common/interfaces.sol";
+import { Stores } from "../../common/stores.sol";
+
+abstract contract Helpers is Stores, Basic {
+	/**
+	 * @dev dexSimulation Address
+	 */
+	address internal constant dexSimulation =
+		0xa5044f8FfA8FbDdd0781cEDe502F1C493BB6978A;
+}
diff --git a/contracts/arbitrum/connectors/dexSimulation/interfaces.sol b/contracts/arbitrum/connectors/dexSimulation/interfaces.sol
new file mode 100644
index 00000000..bb390ddd
--- /dev/null
+++ b/contracts/arbitrum/connectors/dexSimulation/interfaces.sol
@@ -0,0 +1,11 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+interface InstaDexSimulation {
+	function swap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount
+	) external payable;
+}
diff --git a/contracts/arbitrum/connectors/dexSimulation/main.sol b/contracts/arbitrum/connectors/dexSimulation/main.sol
new file mode 100644
index 00000000..4b65de7e
--- /dev/null
+++ b/contracts/arbitrum/connectors/dexSimulation/main.sol
@@ -0,0 +1,69 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+pragma experimental ABIEncoderV2;
+
+/**
+ * @title Insta dex simulation.
+ * @dev swap.
+ */
+
+import { Events } from "./events.sol";
+import "./helpers.sol";
+
+abstract contract InstaDexSimulationResolver is Events, Helpers {
+	/**
+	 * @dev Simulation swap using Insta dex swap contract
+	 * @param sellToken The token to sell/swap
+	 * @param buyToken The token to buy
+	 * @param sellAmount The sell token amount
+	 * @param buyAmount The buy token amount
+	 * @param setId Set token amount at this ID in `InstaMemory` Contract.
+	 * @param getId Get token amount at this ID in `InstaMemory` Contract.
+	 */
+	function swap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount,
+		uint256 setId,
+		uint256 getId
+	)
+		external
+		payable
+		returns (string memory _eventName, bytes memory _eventParam)
+	{
+		sellAmount = getUint(getId, sellAmount);
+		uint256 nativeAmount;
+
+		if (sellToken == ethAddr) {
+			sellAmount = sellAmount == uint256(-1)
+				? address(this).balance
+				: sellAmount;
+			nativeAmount = sellAmount;
+		} else {
+			TokenInterface tokenContract = TokenInterface(sellToken);
+
+			sellAmount = sellAmount == uint256(-1)
+				? tokenContract.balanceOf(address(this))
+				: sellAmount;
+
+			approve(tokenContract, address(dexSimulation), sellAmount);
+		}
+
+		InstaDexSimulation(dexSimulation).swap{ value: nativeAmount }(
+			sellToken,
+			buyToken,
+			sellAmount,
+			buyAmount
+		);
+
+		setUint(setId, buyAmount);
+
+		_eventName = "LogSimulateSwap(address,address,uint256,uint256)";
+		_eventParam = abi.encode(sellToken, buyToken, sellAmount, buyAmount);
+	}
+}
+
+contract ConnectV2InstaDexSimulationArbitrum is InstaDexSimulationResolver {
+	string public name = "Instadapp-DEX-Simulation-v1";
+}
diff --git a/contracts/avalanche/connectors/dexSimulation/events.sol b/contracts/avalanche/connectors/dexSimulation/events.sol
new file mode 100644
index 00000000..083afebe
--- /dev/null
+++ b/contracts/avalanche/connectors/dexSimulation/events.sol
@@ -0,0 +1,11 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+contract Events {
+	event LogSimulateSwap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount
+	);
+}
diff --git a/contracts/avalanche/connectors/dexSimulation/helpers.sol b/contracts/avalanche/connectors/dexSimulation/helpers.sol
new file mode 100644
index 00000000..6d65ff2c
--- /dev/null
+++ b/contracts/avalanche/connectors/dexSimulation/helpers.sol
@@ -0,0 +1,15 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+import "./interfaces.sol";
+import { Basic } from "../../common/basic.sol";
+import { TokenInterface } from "../../common/interfaces.sol";
+import { Stores } from "../../common/stores.sol";
+
+abstract contract Helpers is Stores, Basic {
+	/**
+	 * @dev dexSimulation Address
+	 */
+	address internal constant dexSimulation =
+		0x266b527deb47eBe327D1933da310ef13Fe76D213;
+}
diff --git a/contracts/avalanche/connectors/dexSimulation/interfaces.sol b/contracts/avalanche/connectors/dexSimulation/interfaces.sol
new file mode 100644
index 00000000..bb390ddd
--- /dev/null
+++ b/contracts/avalanche/connectors/dexSimulation/interfaces.sol
@@ -0,0 +1,11 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+interface InstaDexSimulation {
+	function swap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount
+	) external payable;
+}
diff --git a/contracts/avalanche/connectors/dexSimulation/main.sol b/contracts/avalanche/connectors/dexSimulation/main.sol
new file mode 100644
index 00000000..6631a066
--- /dev/null
+++ b/contracts/avalanche/connectors/dexSimulation/main.sol
@@ -0,0 +1,69 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+pragma experimental ABIEncoderV2;
+
+/**
+ * @title Insta dex simulation.
+ * @dev swap.
+ */
+
+import { Events } from "./events.sol";
+import "./helpers.sol";
+
+abstract contract InstaDexSimulationResolver is Events, Helpers {
+	/**
+	 * @dev Simulation swap using Insta dex swap contract
+	 * @param sellToken The token to sell/swap
+	 * @param buyToken The token to buy
+	 * @param sellAmount The sell token amount
+	 * @param buyAmount The buy token amount
+	 * @param setId Set token amount at this ID in `InstaMemory` Contract.
+	 * @param getId Get token amount at this ID in `InstaMemory` Contract.
+	 */
+	function swap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount,
+		uint256 setId,
+		uint256 getId
+	)
+		external
+		payable
+		returns (string memory _eventName, bytes memory _eventParam)
+	{
+		sellAmount = getUint(getId, sellAmount);
+		uint256 nativeAmount;
+
+		if (sellToken == avaxAddr) {
+			sellAmount = sellAmount == uint256(-1)
+				? address(this).balance
+				: sellAmount;
+			nativeAmount = sellAmount;
+		} else {
+			TokenInterface tokenContract = TokenInterface(sellToken);
+
+			sellAmount = sellAmount == uint256(-1)
+				? tokenContract.balanceOf(address(this))
+				: sellAmount;
+
+			approve(tokenContract, address(dexSimulation), sellAmount);
+		}
+
+		InstaDexSimulation(dexSimulation).swap{ value: nativeAmount }(
+			sellToken,
+			buyToken,
+			sellAmount,
+			buyAmount
+		);
+
+		setUint(setId, buyAmount);
+
+		_eventName = "LogSimulateSwap(address,address,uint256,uint256)";
+		_eventParam = abi.encode(sellToken, buyToken, sellAmount, buyAmount);
+	}
+}
+
+contract ConnectV2InstaDexSimulationAvalanche is InstaDexSimulationResolver {
+	string public name = "Instadapp-DEX-Simulation-v1";
+}
diff --git a/contracts/fantom/connectors/dexSimulation/events.sol b/contracts/fantom/connectors/dexSimulation/events.sol
new file mode 100644
index 00000000..083afebe
--- /dev/null
+++ b/contracts/fantom/connectors/dexSimulation/events.sol
@@ -0,0 +1,11 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+contract Events {
+	event LogSimulateSwap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount
+	);
+}
diff --git a/contracts/fantom/connectors/dexSimulation/helpers.sol b/contracts/fantom/connectors/dexSimulation/helpers.sol
new file mode 100644
index 00000000..d607ad86
--- /dev/null
+++ b/contracts/fantom/connectors/dexSimulation/helpers.sol
@@ -0,0 +1,15 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+import "./interfaces.sol";
+import { Basic } from "../../common/basic.sol";
+import { TokenInterface } from "../../common/interfaces.sol";
+import { Stores } from "../../common/stores.sol";
+
+abstract contract Helpers is Stores, Basic {
+	/**
+	 * @dev dexSimulation Address
+	 */
+	address internal constant dexSimulation =
+		0xbD07728E20c49F0Fa22c82915955fbeA5E203a6a;
+}
diff --git a/contracts/fantom/connectors/dexSimulation/interfaces.sol b/contracts/fantom/connectors/dexSimulation/interfaces.sol
new file mode 100644
index 00000000..bb390ddd
--- /dev/null
+++ b/contracts/fantom/connectors/dexSimulation/interfaces.sol
@@ -0,0 +1,11 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+interface InstaDexSimulation {
+	function swap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount
+	) external payable;
+}
diff --git a/contracts/fantom/connectors/dexSimulation/main.sol b/contracts/fantom/connectors/dexSimulation/main.sol
new file mode 100644
index 00000000..2536c69e
--- /dev/null
+++ b/contracts/fantom/connectors/dexSimulation/main.sol
@@ -0,0 +1,69 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+pragma experimental ABIEncoderV2;
+
+/**
+ * @title Insta dex simulation.
+ * @dev swap.
+ */
+
+import { Events } from "./events.sol";
+import "./helpers.sol";
+
+abstract contract InstaDexSimulationResolver is Events, Helpers {
+	/**
+	 * @dev Simulation swap using Insta dex swap contract
+	 * @param sellToken The token to sell/swap
+	 * @param buyToken The token to buy
+	 * @param sellAmount The sell token amount
+	 * @param buyAmount The buy token amount
+	 * @param setId Set token amount at this ID in `InstaMemory` Contract.
+	 * @param getId Get token amount at this ID in `InstaMemory` Contract.
+	 */
+	function swap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount,
+		uint256 setId,
+		uint256 getId
+	)
+		external
+		payable
+		returns (string memory _eventName, bytes memory _eventParam)
+	{
+		sellAmount = getUint(getId, sellAmount);
+		uint256 nativeAmount;
+
+		if (sellToken == ftmAddr) {
+			sellAmount = sellAmount == uint256(-1)
+				? address(this).balance
+				: sellAmount;
+			nativeAmount = sellAmount;
+		} else {
+			TokenInterface tokenContract = TokenInterface(sellToken);
+
+			sellAmount = sellAmount == uint256(-1)
+				? tokenContract.balanceOf(address(this))
+				: sellAmount;
+
+			approve(tokenContract, address(dexSimulation), sellAmount);
+		}
+
+		InstaDexSimulation(dexSimulation).swap{ value: nativeAmount }(
+			sellToken,
+			buyToken,
+			sellAmount,
+			buyAmount
+		);
+
+		setUint(setId, buyAmount);
+
+		_eventName = "LogSimulateSwap(address,address,uint256,uint256)";
+		_eventParam = abi.encode(sellToken, buyToken, sellAmount, buyAmount);
+	}
+}
+
+contract ConnectV2InstaDexSimulationFantom is InstaDexSimulationResolver {
+	string public name = "Instadapp-DEX-Simulation-v1";
+}
diff --git a/contracts/optimism/connectors/dexSimulation/events.sol b/contracts/optimism/connectors/dexSimulation/events.sol
new file mode 100644
index 00000000..083afebe
--- /dev/null
+++ b/contracts/optimism/connectors/dexSimulation/events.sol
@@ -0,0 +1,11 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+contract Events {
+	event LogSimulateSwap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount
+	);
+}
diff --git a/contracts/optimism/connectors/dexSimulation/helpers.sol b/contracts/optimism/connectors/dexSimulation/helpers.sol
new file mode 100644
index 00000000..13eb5c92
--- /dev/null
+++ b/contracts/optimism/connectors/dexSimulation/helpers.sol
@@ -0,0 +1,15 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+import "./interfaces.sol";
+import { Basic } from "../../common/basic.sol";
+import { TokenInterface } from "../../common/interfaces.sol";
+import { Stores } from "../../common/stores.sol";
+
+abstract contract Helpers is Stores, Basic {
+	/**
+	 * @dev dexSimulation Address
+	 */
+	address internal constant dexSimulation =
+		0x718365C3d1aA4c5CcE869E16bE3f6A96EC65200b;
+}
diff --git a/contracts/optimism/connectors/dexSimulation/interfaces.sol b/contracts/optimism/connectors/dexSimulation/interfaces.sol
new file mode 100644
index 00000000..bb390ddd
--- /dev/null
+++ b/contracts/optimism/connectors/dexSimulation/interfaces.sol
@@ -0,0 +1,11 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+interface InstaDexSimulation {
+	function swap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount
+	) external payable;
+}
diff --git a/contracts/optimism/connectors/dexSimulation/main.sol b/contracts/optimism/connectors/dexSimulation/main.sol
new file mode 100644
index 00000000..0603811b
--- /dev/null
+++ b/contracts/optimism/connectors/dexSimulation/main.sol
@@ -0,0 +1,69 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+pragma experimental ABIEncoderV2;
+
+/**
+ * @title Insta dex simulation.
+ * @dev swap.
+ */
+
+import { Events } from "./events.sol";
+import "./helpers.sol";
+
+abstract contract InstaDexSimulationResolver is Events, Helpers {
+	/**
+	 * @dev Simulation swap using Insta dex swap contract
+	 * @param sellToken The token to sell/swap
+	 * @param buyToken The token to buy
+	 * @param sellAmount The sell token amount
+	 * @param buyAmount The buy token amount
+	 * @param setId Set token amount at this ID in `InstaMemory` Contract.
+	 * @param getId Get token amount at this ID in `InstaMemory` Contract.
+	 */
+	function swap(
+		address sellToken,
+		address buyToken,
+		uint256 sellAmount,
+		uint256 buyAmount,
+		uint256 setId,
+		uint256 getId
+	)
+		external
+		payable
+		returns (string memory _eventName, bytes memory _eventParam)
+	{
+		sellAmount = getUint(getId, sellAmount);
+		uint256 nativeAmount;
+
+		if (sellToken == ethAddr) {
+			sellAmount = sellAmount == uint256(-1)
+				? address(this).balance
+				: sellAmount;
+			nativeAmount = sellAmount;
+		} else {
+			TokenInterface tokenContract = TokenInterface(sellToken);
+
+			sellAmount = sellAmount == uint256(-1)
+				? tokenContract.balanceOf(address(this))
+				: sellAmount;
+
+			approve(tokenContract, address(dexSimulation), sellAmount);
+		}
+
+		InstaDexSimulation(dexSimulation).swap{ value: nativeAmount }(
+			sellToken,
+			buyToken,
+			sellAmount,
+			buyAmount
+		);
+
+		setUint(setId, buyAmount);
+
+		_eventName = "LogSimulateSwap(address,address,uint256,uint256)";
+		_eventParam = abi.encode(sellToken, buyToken, sellAmount, buyAmount);
+	}
+}
+
+contract ConnectV2InstaDexSimulationOptimism is InstaDexSimulationResolver {
+	string public name = "Instadapp-DEX-Simulation-v1";
+}