Result: {
    currency: string;
    fees: {
        [pair: string]: {
            fee: string;
            maxfee: string;
            minfee: string;
            nextfee: string;
            nextvolume: string;
            tiervolume: string;
        };
    };
    fees_maker: {
        [pair: string]: {
            fee: string;
            maxfee: string;
            minfee: string;
            nextfee: string;
            nextvolume: string;
            tiervolume: string;
        };
    };
    volume: string;
}

Reference: Get Trade Volume