Bancor strategy

contracts/interfaces/bancor/IBancor.sol

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+// SPDX-License-Identifier: MIT
+
+pragma solidity 0.6.12;
+
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
+/*
+    Liquidity Protection Store interface
+*/
+interface ILiquidityProtectionStore {
+
+    /**
+     * @dev returns an existing locked network token (BNT) balance details
+     *
+     * @param _provider    locked balances provider
+     * @param _index       start index
+     * @return amount of network tokens
+     * @return lock expiration time
+     */
+    function lockedBalance(address _provider, uint256 _index) external view returns (uint256, uint256);
+
+    /**
+     * @dev returns an existing protected liquidity details
+     *
+     * @param _id  protected liquidity id
+     *
+     * @return liquidity provider
+     * @return pool token address
+     * @return reserve token address
+     * @return pool token amount (total)
+     * @return reserve token amount (staked)
+     * @return rate of 1 protected reserve token in units of the other reserve token (numerator)
+     * @return rate of 1 protected reserve token in units of the other reserve token (denominator)
+     * @return timestamp
+     */
+    function protectedLiquidity(uint256 _id)
+        external
+        view
+        returns (
+            address,
+            address,
+            address,
+            uint256,
+            uint256,
+            uint256,
+            uint256,
+            uint256
+        );
+}
+
+/*
+    Liquidity Protection interface
+*/
+interface ILiquidityProtection {
+
+    function addLiquidity(
+        IERC20 poolAnchor,
+        IERC20 reserveToken,
+        uint256 amount
+    ) external payable returns (uint256);
+
+    function removeLiquidity(uint256 id, uint32 portion) external;
+
+    function removeLiquidityReturn(
+        uint256 id,
+        uint32 portion,
+        uint256 removeTimestamp
+    ) external view returns (
+        uint256,
+        uint256,
+        uint256
+    );
+}
+
+/*
+    Liquidity Protection Stats interface
+*/
+interface ILiquidityProtectionStats {
+
+    /**
+     * @dev returns the total amount of protected pool tokens
+     *
+     * @param poolToken pool token address
+     * @return total amount of protected pool tokens
+     */
+    function totalPoolAmount(IERC20 poolToken) external view returns (uint256);
+
+    /**
+     * @dev returns the total amount of protected reserve tokens
+     *
+     * @param poolToken     pool token address
+     * @param reserveToken  reserve token address
+     * @return total amount of protected reserve tokens
+     */
+    function totalReserveAmount(IERC20 poolToken, IERC20 reserveToken) external view returns (uint256);
+
+}