/**
 * Ethereum transaction signing and contract interaction layer.
 *
 * Provides the missing transaction capability to Milady's wallet system,
 * which currently only handles key generation and balance fetching.
 * Used by the registry and drop services for on-chain operations.
 */
import { ethers } from "ethers";
export declare class TxService {
    private readonly provider;
    private readonly wallet;
    private readonly rpcUrl;
    constructor(rpcUrl: string, privateKey: string);
    /**
     * Get fresh nonce for the wallet address.
     * Always fetches from blockchain using a fresh provider to avoid caching issues.
     * This ensures we always get the correct nonce even after failed transactions.
     */
    getFreshNonce(): Promise<number>;
    get address(): string;
    getBalance(): Promise<bigint>;
    getBalanceFormatted(): Promise<string>;
    getChainId(): Promise<number>;
    getContract(address: string, abi: ethers.InterfaceAbi): ethers.Contract;
    getReadOnlyContract(address: string, abi: ethers.InterfaceAbi): ethers.Contract;
    estimateGas(tx: ethers.TransactionRequest): Promise<bigint>;
    getFeeData(): Promise<ethers.FeeData>;
    /**
     * Wait for a transaction to be mined and return the receipt.
     * Throws if the transaction fails or times out.
     */
    waitForTransaction(txHash: string, confirmations?: number, timeoutMs?: number): Promise<ethers.TransactionReceipt>;
    /**
     * Estimate the gas cost in ETH for a contract call.
     * Useful for showing users how much gas they'll need.
     */
    estimateGasCostEth(tx: ethers.TransactionRequest): Promise<string>;
    /**
     * Check whether the wallet has enough balance for a given value + estimated gas.
     */
    hasEnoughBalance(value: bigint, gasEstimate: bigint): Promise<boolean>;
    /**
     * Log a summary of the tx service state for diagnostics.
     */
    logStatus(): Promise<void>;
}
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