/**
 * Generates a secure 256-bit API key
 * @returns {string} A 64-character hexadecimal string
 */
export declare const generateApiKey: () => string;
/**
 * Validates if a string is a valid API key format
 * @param {string} key - The key to validate
 * @returns {boolean} True if the key is 64 characters and hexadecimal
 */
export declare const isValidApiKeyFormat: (key: string) => boolean;
/**
 * Checks if a string looks like an API key (64 characters)
 * @param {string} token - The token to check
 * @returns {boolean} True if it might be an API key
 */
export declare const looksLikeApiKey: (token: string) => boolean;