import type { RelayClient } from '../client.js';
/**
 * Checks if a URL is a known Relay API endpoint
 * @param url - The URL to validate
 * @returns true if the URL starts with a known Relay API base URL
 */
export declare function isRelayApiUrl(url: string): boolean;
/**
 * Gets API key header if client has API key and URL is a Relay API endpoint
 * @param client - The RelayClient instance
 * @param url - Target URL (defaults to client.baseApiUrl)
 * @returns Object with x-api-key header or empty object
 */
export declare function getApiKeyHeader(client: RelayClient | undefined, url?: string): Record<string, string>;
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