import type { Connector } from '../wagmi/hooks';
export declare const POLYGON_CHAIN_ID = 137;
/**
 * Checks if the user's wallet RPC for Polygon is responsive by sending an eth_blockNumber call.
 * We use eth_blockNumber instead of eth_chainId because eth_chainId can be intercepted
 * by the wallet itself and may not actually hit the RPC.
 *
 * The default polygon-rpc.com stopped working in Feb 2026.
 *
 * @returns true if the RPC appears to be down/unreachable
 */
export declare function isPolygonRpcDown(fromChainId: string | undefined, connector: Connector | undefined): Promise<boolean>;