/**
 * Checks if a string is a valid ENS name
 * @param value The string to check
 * @returns boolean indicating if the string is a valid ENS name
 */
export declare const isENS: (value: string) => boolean;
/**
 * Checks if a string is a valid Ethereum address
 * @param value The string to check
 * @returns boolean indicating if the string is a valid Ethereum address
 */
export declare const isEthereumAddress: (value: string) => boolean;
/**
 * Resolves an ENS name to an Ethereum address
 * @param ensName The ENS name to resolve
 * @returns The resolved Ethereum address or null if resolution fails
 */
export declare const resolveENS: (ensName: string) => Promise<string | null>;
/**
 * Gets the username associated with a wallet address
 * @param walletAddress The wallet address to look up
 * @param walletSdkKey The wallet SDK key for authorization
 * @returns Object containing username information
 */
export declare const getUsernameForWalletAddress: (walletAddress: string, walletSdkKey: string) => Promise<any>;
/**
 * Gets the wallet address associated with a username
 * @param username The username to look up
 * @param walletSdkKey The wallet SDK key for authorization
 * @returns Object containing wallet address information
 */
export declare const getWalletAddressForUsername: (username: string, walletSdkKey: string) => Promise<any>;
/**
 * Resolves a wallet address to an ENS name
 * @param address The wallet address to resolve
 * @returns The resolved ENS name or null if resolution fails
 */
export declare const reverseResolveENS: (address: string) => Promise<string | null>;
/**
 * Looks up user information for any input (address, username, ENS, etc.)
 * @param input The input string to look up
 * @param walletSdkKey The wallet SDK key for authorization
 * @returns Object containing user information
 */
export declare const lookupUser: (input: string, walletSdkKey: string) => Promise<any>;