import { type SupportedChainName } from '../constants/chains.js';
/** Resolve a chain alias (case-insensitive) to a canonical SupportedChainName.
 *  Returns undefined if the alias is not recognized.
 */
export declare function resolveChainAlias(input: string): SupportedChainName | undefined;
/** Resolve a chain ID to a canonical SupportedChainName.
 *  Returns undefined if the chain ID is not recognized.
 */
export declare function chainIdToName(chainId: number): SupportedChainName | undefined;
/** Validate an Ethereum address (0x-prefixed, 40 hex chars) */
export declare function isValidAddress(address: string): address is `0x${string}`;
/** Validate and return a typed Ethereum address, or throw */
export declare function validateAddress(address: string): `0x${string}`;
/** Check if an address is the zero address */
export declare function isZeroAddress(address: string): boolean;
/** Validate a private key format (0x-prefixed, 64 hex chars) */
export declare function isValidPrivateKey(key: string): boolean;
/** Validate and return a typed private key, or throw */
export declare function validatePrivateKey(key: string): `0x${string}`;
/** Validate a chain name against supported chains */
export declare function isValidChainName(chain: string): chain is SupportedChainName;
/** Validate and return a typed chain name, or throw.
 *  Accepts aliases (e.g. 'base-sepolia', 'eth-sepolia', 'sepolia').
 */
export declare function validateChainName(chain: string): SupportedChainName;
/** Validate a bytes32 hex string (0x-prefixed, 64 hex chars) */
export declare function isValidBytes32(value: string): boolean;
/** Validate a URL, optionally requiring HTTPS */
export declare function isValidUrl(url: string, requireHttps?: boolean): boolean;
/** Heuristic: does a registry `endpoint` look like a real, callable public service URL?
 *  Returns false for blank/whitespace, non-http(s), placeholder hosts (example.com, localhost),
 *  and well-known ephemeral tunnels (*.ngrok-free.app, *.trycloudflare.com, …).
 *
 *  This is an ADVISORY "looks callable" flag for ranking/skipping dead listings — NOT a
 *  reachability guarantee and NOT a security control (the SSRF guard protects the actual fetch). (F8) */
export declare function isUsableEndpoint(endpoint?: string | null): endpoint is string;
/** Validate a BigInt is within uint256 range */
export declare function isValidUint256(value: bigint): boolean;
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