pragma solidity ^0.5.16;

// https://sips.synthetix.io/sips/sip-120/
// Uniswap V3 based DecPriceAggregator (unaudited) e.g. https://etherscan.io/address/0xf120f029ac143633d1942e48ae2dfa2036c5786c#code
// https://github.com/sohkai/uniswap-v3-spot-twap-oracle
//  inteface: https://github.com/sohkai/uniswap-v3-spot-twap-oracle/blob/8f9777a6160a089c99f39f2ee297119ee293bc4b/contracts/interfaces/IDexPriceAggregator.sol
//  implementation: https://github.com/sohkai/uniswap-v3-spot-twap-oracle/blob/8f9777a6160a089c99f39f2ee297119ee293bc4b/contracts/DexPriceAggregatorUniswapV3.sol
interface IDexPriceAggregator {
    function assetToAsset(
        address tokenIn,
        uint amountIn,
        address tokenOut,
        uint twapPeriod
    ) external view returns (uint amountOut);
}