export declare const XCHAINJS_IDENTIFIER = "xchainjs-client";
export declare const NINE_REALMS_CLIENT_HEADER = "x-client-id";
/**
 * Middleware to add custom header to requests (9R endpoints only)
 *
 * @param request RequestArgs (rxjs/ajax) | AxiosRequestConfig (axios)
 * @returns RequestArgs (rxjs/ajax) | AxiosRequestConfig (axios)
 */
export declare const add9Rheader: <T extends {
    url?: string;
    headers?: Record<string, string>;
}>(request: T) => T;
/**
 * Adds custom header to axios requests (9R endpoints only)
 */
export declare const register9Rheader: (axios: any) => void;