import { ApproveErc20, Currency } from '../model';
/**
 * Approve ERC20 transfer for spender.
 * @param testnet chain to work with
 * @param body request data
 * @param provider optional provider to enter. if not present, Tatum Web3 will be used.
 * @returns {txId: string} Transaction ID of the operation, or signatureID in case of Tatum KMS
 */
export declare const sendApproveErc20: (testnet: boolean, body: ApproveErc20, provider?: string | undefined) => Promise<unknown>;
/**
 * Prepare approve ERC20 signed transaction.
 * @param testnet if we are on testnet or not
 * @param body body of the approve operation
 * @param provider optional Web3 provider
 */
export declare const prepareApproveErc20: (testnet: boolean, body: ApproveErc20, provider?: string | undefined) => Promise<string>;
/**
 * Get Decimals for the ERC20 token
 * @param testnet if we are using testnet or mainnet
 * @param chain chain to query for the token
 * @param contractAddress address of the token
 * @param provider optional provider
 */
export declare const getErc20Decimals: (testnet: boolean, chain: Currency, contractAddress: string, provider?: string | undefined) => Promise<any>;