Standard Interface

interface IPropPair {
    /// OPTIONAL — Rialto never calls these; pair & ordering come from config.
    function token0() external view returns (address);
    function token1() external view returns (address);

    /// QUOTE (read-only view). Exact-in only.
    /// zeroForOne = true  -> selling token0, receiving token1
    /// zeroForOne = false -> selling token1, receiving token0
    function getAmountOut(bool zeroForOne, uint256 amountIn)
        external view returns (uint256 amountOut);

    /// SETTLE (state-changing). Called by RialtoRouter only.
    function swapExactIn(
        bool zeroForOne,
        uint256 amountIn,
        uint256 amountOutMin,
        address to,
        uint256 deadline
    ) external payable returns (uint256 amountOut);
}