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+---
+sidebar_position: 5
+---
+
+# Execute Remote Smart Contract Though LCMP-XCMP Routing
+
+We first deploy a example Dapp. And then mock a user to use the Dapp to call a function on `Moonbase Alpha` from `Pangolin Smart Chain`.
+
+## Prepare
+
+### Accounts
+
+1. **PSC Account 1**: a `Pangolin Smart Chain` account to deploy contracts including `PangolinEndpoint` and `Caller`.
+2. **MA Account 1**: a `Moonbase Alpha` account to deploy contracts including `MoonbaseEndpoint` and `Callee`.
+3. **PP Account 1**: a `Pangolin Parachain` account which will be used to recharge Dapp's derived account(**B**).
+4. **Dapp Accounts**: accounts belongs to the Dapp. `PangolinEndpoint`, `Caller`, `MoonbaseEndpoint` and `Callee` 's addresses are Dapp accounts.  
+   **Sender Account**: `PangolinEndpoint`'s address is the sender of the cross-chain message. Below is the deriving path of the **Sender Account**.
+    ![Address deriving](/img/address-deriving.png) 
+   **A1**: **Sender Account**, `PangolinEndpoint`'s address.  
+   **A2**: **Sender Account** in substrate address format.  
+   **B**: derived substrate address of the **Sender Account** on Pangolin Parachain.  
+   **C**: derived evm address of the **Sender Account** on Moonbase Alpha.  
+5. **User Account**: a user account to send transaction on `Pangolin Smart Chain`. This account will pay for the cross-chain fee. 
+
+### Prepare Contracts(Dapp)
+
+You need to prepair 4 contracts. These contracts form a very simple Dapp.
+
+#### 1. PangolinEndpoint
+```javascript
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.9;
+
+import "../../moonbeam/AbstractDarwiniaEndpoint.sol";
+
+contract PangolinEndpoint is AbstractDarwiniaEndpoint {
+    constructor() {
+        remoteMessageTransactCallIndex = 0x2600;
+        routerForwardCallIndex = 0x1a01;
+        dispatchAddress = address(1025);
+        sendMessageCallIndex = 0x3f03;
+        storageAddress = address(1024);
+        storageKeyForMarketFee = 0x39bf2363dd0720bd6e11a4c86f4949322edb70953213f33a6ef6b8a5e3ffcab2;
+        storageKeyForLatestNonce = 0xdcdffe6202217f0ecb0ec75d8a09b32c96c246acb9b55077390e3ca723a0ca1f;
+        storageKeyForLastDeliveredNonce = 0xdcdffe6202217f0ecb0ec75d8a09b32ce5f83cf83f2127eb47afdc35d6e43fab;
+        outboundLaneId = 0x70616c69;
+        inboundLaneId = 0x70616c69;
+    }
+
+    function _executable(address, bytes calldata)
+        internal
+        pure
+        override
+        returns (bool)
+    {
+        return true;
+    }
+
+    function remoteExecute(
+        uint32 _routerSpecVersion,
+        address _callReceiver,
+        bytes calldata _callPayload,
+        uint256 _gasLimit
+    ) external payable returns (uint256) {
+        return
+            _remoteExecute(
+                _routerSpecVersion,
+                _callReceiver,
+                _callPayload,
+                _gasLimit
+            );
+    }
+
+    function setRemoteEndpoint(bytes4 routerChainId, address remoteEndpoint)
+        external
+    {
+        _setRemoteEndpoint(routerChainId, remoteEndpoint);
+    }
+
+    // origin from pangolin to moonbase, B
+    function getMessageOriginOnPangolinParachain() external view returns (bytes32) {
+        // H160(sender on the sourc chain) > AccountId32
+        bytes32 derivedSubstrateAddress = AccountId.deriveSubstrateAddress(
+            address(this)
+        );
+
+        // AccountId32 > derived AccountId32
+        bytes32 derivedAccountId = SmartChainXLib.deriveAccountId(
+            0x7061676c, // pangolin chain id // pagl
+            derivedSubstrateAddress
+        );
+
+        return derivedAccountId;
+    }
+}
+
+```
+
+#### 2. MoonbaseEndpoint
+```javascript
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.9;
+
+import "../../moonbeam/AbstractMoonbeamEndpoint.sol";
+
+contract MoonbaseEndpoint is AbstractMoonbeamEndpoint {
+    constructor() {
+        remoteSmartChainId = 43;
+        remoteMessageTransactCallIndex = 0x2901;
+        routerSendMessageCallIndex = 0x1503;
+        routerOutboundLaneId = 0x70616c69; // pali
+        routerParachainId = 0x00000839;
+        feeLocationAddress = 0xFFFffFfF8283448b3cB519Ca4732F2ddDC6A6165;
+    }
+
+    function _executable(address, bytes calldata)
+        internal
+        pure
+        override
+        returns (bool)
+    {
+        return true;
+    }
+
+    function remoteExecute(
+        uint32 _tgtSpecVersion,
+        address _callReceiver,
+        bytes calldata _callPayload,
+        uint256 _gasLimit,
+        uint128 _deliveryAndDispatchFee
+    ) external payable {
+        _remoteExecute(
+            _tgtSpecVersion,
+            _callReceiver,
+            _callPayload,
+            _gasLimit,
+            _deliveryAndDispatchFee
+        );
+    }
+
+    function setRemoteEndpoint(
+        bytes4 _remoteChainId,
+        bytes4 _parachainId,
+        address _remoteEndpoint
+    ) external
+    {
+        _setRemoteEndpoint(_remoteChainId, _parachainId, _remoteEndpoint);
+    }
+
+    // origin from moonbase to pangolin, A2
+    function getMessageOriginOnPangolinParachain() external view returns (bytes32) {
+        // H160(sender on the source chain) > AccountId32
+        bytes32 derivedSubstrateAddress = AccountId.deriveSubstrateAddress(
+            address(this)
+        );
+       
+        return derivedSubstrateAddress;
+    }
+}
+```
+
+#### 3. Callee
+```javascript
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.9;
+
+contract Callee {
+    uint256 public sum = 0;
+
+    function add(uint256 _value) external {
+        sum = sum + _value;
+    }
+}
+```
+
+#### 4. Caller
+```javascript
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.9;
+
+import "./PangolinEndpoint.sol";
+
+// pangolin > pangolin-parachain > moonbase
+contract Caller {
+    address public endpoint;
+
+    constructor(address _endpoint) {
+        endpoint = _endpoint;
+    }
+
+    event Hello(address);
+
+    function remoteAdd(address callee) external payable returns (uint256) {
+        uint256 messageId = PangolinEndpoint(endpoint).remoteExecute{value: msg.value}(
+            5320, // pangolin-parachain spec version
+            callee,
+            hex"1003e2d20000000000000000000000000000000000000000000000000000000000000002", // add(2),
+            120000 // gas limit
+        );
+
+        return messageId;
+    }
+
+    function latestNonce() public view returns (uint64) {
+        return SmartChainXLib.latestNonce(
+            address(1024),
+            0xdcdffe6202217f0ecb0ec75d8a09b32c96c246acb9b55077390e3ca723a0ca1f,
+            0x70616c69
+        );
+    }
+}
+```
+## Deploy
+
+### 1. Deploy Endpoints & Let Them Know Each Other
+
+1. Deploy endpoints  
+
+   Deploy `PangolinEndpoint` to Pangolin Smart Chain.  
+   Deploy `MoonbaseEndpoint` to Moonbase Alpha.
+
+2. Let Them Know Each Other
+   * Let moonbase endpoint know pangolin endpoint:  
+  
+     ``` js
+     moonbaseEndpoint.setRemoteEndpoint("0x7061676c", "0x00000839", pangolinEndpoint)
+     ```
+     "0x7061676c" is the Pangolin chain id.  
+     "0x00000839" is the Pangolin Parachain ParaId.
+
+   * Let pangolin endpoint know moonbase endpoint:
+     ``` js
+     pangolinEndpoint.setRemoteEndpoint("0x70676c70", moonbaseEndpoint)
+     ```
+     "0x70676c70" is the Pangolin Parachain chain id.
+
+   * Let moonbase endpoint know pangolin endpoint:
+
+     Not needed for this example.
+
+### 2. Deploy Caller & Callee
+
+  ```js
+  Caller.deploy(pangolin_endpoint_address)
+  ```
+
+  ```js
+  Callee.deploy()
+  ```
+## Recharge User Account Address `B`
+
+Transfer some PRING from **Dapp Account 3** to **User Account B** as gas fee and cross-chain fee. 
+
+> How much?
+
+## Run
+
+Use **User Account A1** to send a transaction to call `Callee.add(2)` from Pangolin Smart Chain
+
+```js
+const fee = hre.ethers.utils.parseEther("300");
+caller.remoteAdd(callee_adderss, { value: fee })
+```
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