import type { Chain } from "viem";
import type { SupportedChain, UserConfig } from "../types/index.js";
export declare const VIEM_CHAINS: Record<SupportedChain, Chain>;
export declare class RpcConfigError extends Error {
    constructor(message: string);
}
/**
 * Reject RPC URLs that are obviously unsafe to talk to:
 *  - non-https (http plaintext leaks your wallet query pattern to anything on
 *    the network path)
 *  - loopback / private / link-local hosts (RFC1918, 127/8, ::1, *.local).
 *    Private-range URLs in a shared config are a strong indicator something
 *    got mis-pasted (e.g. a neighbour's dev box) and we'd rather fail loud
 *    than exfiltrate wallet addresses to an unexpected host.
 * Callers who intentionally want to hit a local forked node (anvil, hardhat,
 * etc.) can opt out with RECON_ALLOW_INSECURE_RPC=1.
 */
export declare function validateRpcUrl(chain: SupportedChain, url: string): void;
export declare function isPrivateOrLoopbackHost(host: string): boolean;
/**
 * Resolve the RPC URL for a given chain based on env vars (highest priority)
 * then the user's ~/.recon-crypto-mcp/config.json.
 */
export declare function resolveRpcUrl(chain: SupportedChain, userConfig: UserConfig | null): string;