export interface RegisteredChain {
    /** Chain label in the registry (e.g., "optimism", "base") */
    label: string;
    /** Human-readable chain name (e.g., "OP Mainnet", "Base") */
    name: string;
    /** CAIP-2 chain type (e.g., "eip155", "solana", "bip122") */
    chainType: string;
    /** CAIP-2 chain reference (e.g., "1", "10", "8453") */
    chainReference: string;
}
export interface GetRegisteredChainsOptions {
    /** Ethereum mainnet RPC URL. Falls back to MAINNET_RPC_URL env var. */
    rpcUrl?: string;
}
/**
 * Fetches all chains registered in the on.eth ChainResolver contract.
 *
 * Calls `chainCount()` then `getChainAtIndex()` for each index via multicall,
 * and decodes the ERC-7930 interoperable address to extract the CAIP-2 chain type and reference.
 *
 * @see https://github.com/unruggable-labs/chain-resolver/blob/main/web/mainnet_on.html#L830
 *
 * @example
 * ```ts
 * const chains = await getRegisteredChains({ rpcUrl: process.env.MAINNET_RPC_URL });
 * // [{ label: "optimism", name: "OP Mainnet", chainType: "eip155", chainReference: "10" }, ...]
 * ```
 */
export declare function getRegisteredChains(options?: GetRegisteredChainsOptions): Promise<RegisteredChain[]>;
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