aave-protocol-v2/contracts/interfaces/IExchangeAdapter.sol

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.6.12;

import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol';

interface IExchangeAdapter {
  event Exchange(
    address indexed from,
    address indexed to,
    address indexed platform,
    uint256 fromAmount,
    uint256 toAmount
  );

  function approveExchange(IERC20[] calldata tokens) external;

  function exchange(
    address from,
    address to,
    uint256 amount,
    uint256 maxSlippage
  ) external returns (uint256);
}