IPriceOracle

Each vault has the address of a price oracle installed. This address is immutable and cannot be changed, even by the vault governor. If updates to pricing sources are desired, this address should be a governed EulerRouter pricing component. All oracles must implement the IPriceOracle interface below:

interface IPriceOracle {
    /// @return General description of this oracle implementation.
    function name() external view returns (string memory);

    /// @return outAmount The amount of `quote` that is equivalent to `inAmount` of `base`.
    function getQuote(
        uint256 inAmount,
        address base,
        address quote
    ) external view returns (uint256 outAmount);

    /// @return bidOutAmount The amount of `quote` you would get for selling `inAmount` of `base`.
    /// @return askOutAmount The amount of `quote` you would spend for buying `inAmount` of `base`.
    function getQuotes(
        uint256 inAmount,
        address base,
        address quote
    ) external view returns (uint256 bidOutAmount, uint256 askOutAmount);
}

This interface shapes oracle interactions in an important way: it forces the consumer to think in amounts rather than prices.

A subset of this interface (getQuote) has been standardized in ERC-7726.