add support for quoting fees in native token

interfaces/IIsmpModule.sol

@@ -77,6 +77,15 @@ interface IIsmpModule {
 	function onGetTimeout(GetRequest memory request) external;
 }
 
+
+/**
+ * @dev Uniswap interface for estimating fees in the native token
+ */
+interface IUniswapV2Router02 {
+	function WETH() external pure returns (address);
+	function getAmountsIn(uint, address[] calldata) external pure returns (uint[] memory);
+}
+
 /**
  * @dev Abstract contract to make implementing `IIsmpModule` easier.
  */
@@ -114,31 +123,71 @@ abstract contract BaseIsmpModule is IIsmpModule {
 	function host() public view virtual returns (address);
 
 	/**
-	 * @dev returns the quoted fee for dispatching a POST request
+	 * @dev returns the quoted fee in the feeToken for dispatching a POST request
 	 */
 	function quote(DispatchPost memory request) public view returns (uint256) {
 		uint256 len = 32 > request.body.length ? 32 : request.body.length;
 		return request.fee + (len * IDispatcher(host()).perByteFee(request.dest));
 	}
 
 	/**
-	 * @dev returns the quoted fee for dispatching a GET request
+	 * @dev returns the quoted fee in the native token for dispatching a POST request
+	 */
+	function quoteNative(DispatchPost memory request) public view returns (uint256) {
+		uint256 fee = quote(request);
+		address _host = host();
+		address _uniswap = IDispatcher(_host).uniswapV2Router();
+		address[] memory path = new address[](2);
+		path[0] = IUniswapV2Router02(_uniswap).WETH();
+		path[1] = IDispatcher(_host).feeToken();
+		return IUniswapV2Router02(_uniswap).getAmountsIn(fee, path)[0];
+	}
+
+	/**
+	 * @dev returns the quoted fee in the feeToken for dispatching a GET request
 	 */
 	function quote(DispatchGet memory request) public view returns (uint256) {
-		uint256 pbf = IDispatcher(host()).perByteFee(IDispatcher(host()).host());
+		address _host = host();
+		uint256 pbf = IDispatcher(_host).perByteFee(IDispatcher(_host).host());
 		uint256 minimumFee = 32 * pbf;
 		uint256 totalFee = request.fee + (pbf * request.context.length);
 		return minimumFee > totalFee ? minimumFee : totalFee;
 	}
 
 	/**
-	 * @dev returns the quoted fee for dispatching a POST response
+	 * @dev returns the quoted fee in the native token for dispatching a GET request
+	 */
+	function quoteNative(DispatchGet memory request) public view returns (uint256) {
+		uint256 fee = quote(request);
+		address _host = host();
+		address _uniswap = IDispatcher(_host).uniswapV2Router();
+		address[] memory path = new address[](2);
+		path[0] = IUniswapV2Router02(_uniswap).WETH();
+		path[1] = IDispatcher(_host).feeToken();
+		return IUniswapV2Router02(_uniswap).getAmountsIn(fee, path)[0];
+	}
+
+	/**
+	 * @dev returns the quoted fee in the feeToken for dispatching a POST response
 	 */
 	function quote(DispatchPostResponse memory response) public view returns (uint256) {
 		uint256 len = 32 > response.response.length ? 32 : response.response.length;
 		return response.fee + (len * IDispatcher(host()).perByteFee(response.request.source));
 	}
 
+	/**
+	 * @dev returns the quoted fee in the native token for dispatching a POST response
+	 */
+	function quoteNative(DispatchPostResponse memory request) public view returns (uint256) {
+		uint256 fee = quote(request);
+		address _host = host();
+		address _uniswap = IDispatcher(_host).uniswapV2Router();
+		address[] memory path = new address[](2);
+		path[0] = IUniswapV2Router02(_uniswap).WETH();
+		path[1] = IDispatcher(_host).feeToken();
+		return IUniswapV2Router02(_uniswap).getAmountsIn(fee, path)[0];
+	}
+
 	function onAccept(IncomingPostRequest calldata) external virtual onlyHost {
 		revert UnexpectedCall();
 	}

interfaces/StateMachine.sol

@@ -33,4 +33,14 @@ library StateMachine {
 	function evm(uint chainid) internal pure returns (bytes memory) {
 		return bytes(string.concat("EVM-", Strings.toString(chainid)));
 	}
+
+	// @notice Address a substrate state machine
+	function substrate(bytes4 id) internal pure returns (bytes memory) {
+		return bytes(string.concat("SUBSTRATE-", string(abi.encodePacked(id))));
+	}
+
+	// @notice Address a tendermint state machine
+	function tendermint(bytes4 id) internal pure returns (bytes memory) {
+		return bytes(string.concat("TNDRMINT-", string(abi.encodePacked(id))));
+	}
 }

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@polytope-labs/ismp-solidity",
-	"version": "1.0.0",
+	"version": "1.0.1",
 	"description": "Hyperbridge Solidity SDK for the Interoperable state machine protocol",
 	"author": "Polytope Labs <[email protected]>",
 	"license": "Apache-2.0",