import { Currency } from './Currency';
import { Fee } from './Fee';
import { PrivateKeyOrSignatureId } from './PrivateKeyOrSignatureId';
export declare class ApproveErc20 extends PrivateKeyOrSignatureId {
    contractAddress: string;
    chain: Currency;
    spender: string;
    amount: string;
    feeCurrency?: Currency;
    fee?: Fee;
    nonce?: number;
}