/**
 * RPC Utilities
 *
 * Default RPC URLs and chain metadata — sourced from viem/chains where possible.
 * Production apps must provide their own RPCs via walletConfig.ethereum.rpcUrls.
 */
import type { Chain } from 'viem';
import type { SolanaCluster } from '../solana/types';
export declare function getDefaultEthereumRpcUrl(chainId: number): string;
/**
 * Get default Solana RPC URL for a cluster.
 */
export declare function getDefaultSolanaRpcUrl(cluster: SolanaCluster): string;
/**
 * Get chain name by chain ID.
 */
export declare function getChainName(chainId: number): string;
/**
 * Get native currency configuration for a chain.
 */
export declare function getNativeCurrency(chainId: number): {
    name: string;
    symbol: string;
    decimals: number;
};
/**
 * Build a viem Chain from chainId and optional rpcUrls (e.g. from walletConfig.ethereum.rpcUrls).
 * Returns the viem/chains object directly when the chain is known and no custom RPC is provided.
 */
export declare function buildChainFromConfig(chainId: number, rpcUrls?: Record<number, string>): Chain;