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pub trait SpotPriceProvider<AssetId> {
    type Price;

    fn pair_exists(asset_a: AssetId, asset_b: AssetId) -> bool;

    /// Return spot price for given asset pair
    ///
    /// Returns None if such pair does not exist
    fn spot_price(asset_a: AssetId, asset_b: AssetId) -> Option<Self::Price>;
}

/// Manage list of non-dustable accounts
pub trait DustRemovalAccountWhitelist<AccountId> {
    type Error;

    /// Add account to the list.
    fn add_account(account: &AccountId) -> Result<(), Self::Error>;

    /// Remove an account from the list.
    fn remove_account(account: &AccountId) -> Result<(), Self::Error>;
}