import BigNumber from "bignumber.js";
import type { Account } from "@ledgerhq/types-live";
import type { Transaction } from "../types";
export declare const estimatedFeeSafetyRate = 2;
export declare function getEstimatedFees(account: Account): Promise<BigNumber>;
export declare function calculateAmount({ account, transaction, }: {
    account: Account;
    transaction: Transaction;
}): Promise<{
    amount: BigNumber;
    totalSpent: BigNumber;
}>;
export declare function base64ToUrlSafeBase64(data: string): string;
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