mUSD rebalance using DyDx flash loan

contracts/interfaces/ICurve.sol

@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+pragma solidity 0.8.0;
+
+interface ICurve {
+    function get_virtual_price() external returns (uint256 out);
+
+    function add_liquidity(uint256[2] calldata amounts, uint256 deadline) external;
+
+    function get_dy(int128 i, int128 j, uint256 dx)
+        external
+        returns (uint256 out);
+
+    function get_dy_underlying(int128 i, int128 j, uint256 dx)
+        external
+        returns (uint256 out);
+
+    function exchange(
+        int128 i,
+        int128 j,
+        uint256 dx,
+        uint256 min_dy
+    ) external;
+
+    function exchange(
+        int128 i,
+        int128 j,
+        uint256 dx,
+        uint256 min_dy,
+        uint256 deadline
+    ) external;
+
+    function exchange_underlying(
+        int128 i,
+        int128 j,
+        uint256 dx,
+        uint256 min_dy
+    ) external;
+
+    function exchange_underlying(
+        int128 i,
+        int128 j,
+        uint256 dx,
+        uint256 min_dy,
+        uint256 deadline
+    ) external;
+
+    function remove_liquidity(
+        uint256 _amount,
+        uint256 deadline,
+        uint256[2] calldata min_amounts
+    ) external;
+
+    function remove_liquidity_imbalance(uint256[2] calldata amounts, uint256 deadline)
+        external;
+
+    function commit_new_parameters(
+        int128 amplification,
+        int128 new_fee,
+        int128 new_admin_fee
+    ) external;
+
+    function apply_new_parameters() external;
+
+    function revert_new_parameters() external;
+
+    function commit_transfer_ownership(address _owner) external;
+
+    function apply_transfer_ownership() external;
+
+    function revert_transfer_ownership() external;
+
+    function withdraw_admin_fees() external;
+
+    function coins(int128 arg0) external returns (address out);
+
+    function underlying_coins(int128 arg0) external returns (address out);
+
+    function balances(int128 arg0) external returns (uint256 out);
+
+    function A() external returns (int128 out);
+
+    function fee() external returns (int128 out);
+
+    function admin_fee() external returns (int128 out);
+
+    function owner() external returns (address out);
+
+    function admin_actions_deadline() external returns (uint256 out);
+
+    function transfer_ownership_deadline() external returns (uint256 out);
+
+    function future_A() external returns (int128 out);
+
+    function future_fee() external returns (int128 out);
+
+    function future_admin_fee() external returns (int128 out);
+
+    function future_owner() external returns (address out);
+}

contracts/masset/mUSD/Migrator.sol

@@ -44,7 +44,7 @@ library Migrator {
                 MassetStructs.BassetData({ ratio: ratio, vaultBalance: vaultBalance })
             );
 
-            // caclulate scaled vault bAsset balance and totoal vault balance
+            // caclulate scaled vault bAsset balance and total vault balance
             uint128 scaledVaultBalance = (vaultBalance * ratio) / 1e8;
             scaledVaultBalances[i] = scaledVaultBalance;
             maxScaledVaultBalance += scaledVaultBalance;

contracts/z_mocks/masset/migrate3/IMassetV2.sol

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+pragma solidity 0.8.0;
+
+/**
+ * @title mUSD interface before upgrade to V3
+ */
+interface IMassetV2 {
+
+    /** @dev Calc interest */
+    function collectInterest() external returns (uint256 swapFeesGained, uint256 newTotalSupply);
+    function collectPlatformInterest() external returns (uint256 interestGained, uint256 newTotalSupply);
+
+    /** @dev Minting */
+    function mint(address _basset, uint256 _bassetQuantity)
+        external returns (uint256 massetMinted);
+    function mintTo(address _basset, uint256 _bassetQuantity, address _recipient)
+        external returns (uint256 massetMinted);
+    function mintMulti(address[] calldata _bAssets, uint256[] calldata _bassetQuantity, address _recipient)
+        external returns (uint256 massetMinted);
+
+    /** @dev Swapping */
+    function swap( address _input, address _output, uint256 _quantity, address _recipient)
+        external returns (uint256 output);
+    function getSwapOutput( address _input, address _output, uint256 _quantity)
+        external view returns (bool, string memory, uint256 output);
+
+    /** @dev Redeeming */
+    function redeem(address _basset, uint256 _bassetQuantity)
+        external returns (uint256 massetRedeemed);
+    function redeemTo(address _basset, uint256 _bassetQuantity, address _recipient)
+        external returns (uint256 massetRedeemed);
+    function redeemMulti(address[] calldata _bAssets, uint256[] calldata _bassetQuantities, address _recipient)
+        external returns (uint256 massetRedeemed);
+    function redeemMasset(uint256 _mAssetQuantity, address _recipient) external;
+
+    /** @dev Setters for the Manager or Gov to update module info */
+    function upgradeForgeValidator(address _newForgeValidator) external;
+
+    /** @dev Setters for Gov to set system params */
+    function setSwapFee(uint256 _swapFee) external;
+
+    /** @dev Getters */
+    function getBasketManager() external view returns(address);
+    function forgeValidator() external view returns (address);
+    function totalSupply() external view returns (uint256);
+    function swapFee() external view returns (uint256);
+}