import type { Hex } from "@metamask/utils";
import type { FetchFunction } from "../types.cjs";
/**
 * Checks if the given contract address is valid for the given chain ID.
 *
 * @param chainId - The chain ID.
 * @param contract - The contract address.
 * @returns True if the contract address is valid, false otherwise.
 */
export declare function isValidSwapsContractAddress(chainId: Hex, contract: Hex | undefined): boolean;
/**
 * Gets the swaps contract address for the given chain ID.
 *
 * @param chainId - The chain ID.
 * @returns The swaps contract address.
 */
export declare function getSwapsContractAddress(chainId: Hex): string;
export declare const API_BASE_URL = "https://swap.api.cx.metamask.io";
export declare const DEV_BASE_URL = "https://swap.dev-api.cx.metamask.io";
export type SwapsToken = {
    address: string;
    symbol: string;
    name?: string;
    decimals: number;
    iconUrl?: string;
    occurrences?: number;
};
/**
 * Fetches token metadata from API URL.
 *
 * @param chainId - Current chainId.
 * @param fetchFn - Fetch function.
 * @param clientId - Client id.
 * @returns Promise resolving to an object containing token metadata.
 */
export declare function fetchTokens(chainId: Hex, fetchFn: FetchFunction, clientId?: string): Promise<SwapsToken[]>;
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