import BigNumber from "bignumber.js";
import { Log } from "web3-core";
import { Address, ChainId } from "../constants";
import { Wallet } from "../wallet";
/**
 *
 * Fetches current token prices for a chain.  Prices can be up to 5 minutes stale currently,
 * and will be denominated in the supplied base currency.
 *
 * @param apiKey API Key used for authentication
 * @param chainId ChainId to get prices from.  If no ID is provided, will provide prices for all chains
 * @param currency Base currency.  If none is provided, price quotes will be in USD
 * @returns A mapping from token address to current price
 */
export declare const fetchPrices: (apiKey: string, chainId?: ChainId, currency?: string) => Promise<{}>;
/**
 *
 * Uses multicall to fetch token balances for a given wallet and list of token addresses.
 *
 * @param chainId ChainId to fetch balances from
 * @param wallet Address of wallet to find balances for
 * @param tokens Array of token addresses to fetch balances for
 * @returns A map of token address to balance, in TokenAmount.  If a wallet has 0 balance for a token, the entry will be undefined.
 */
export declare function getBalances(chainId: ChainId, wallet: string, tokens: Address[]): Promise<{
    [x: string]: BigNumber;
}>;
/**
 *
 * Listen for an react to any transfer involving a given wallet.
 * When no longer interested in listending, call the returned callback to terminate the listeners.
 *
 * @param wallet Wallet to watch transfers for
 * @param chain Chain to watch transfers on
 * @param tokens Tokens to explicitly watch for transfers
 * @param callback Callback to execute when a transfer is detected
 * @returns A method to unsubcribe from all event listeners requried to watch transfers
 *
 * @exmample
 * ```ts
 *  const wallet = getMyWallet()
 *  const tokens = getMyTokensToWatchOver
 *
 *  const onTransfer = (token: Address, _, pureEvent) => console.log(`Transfer detected for token ${token} in transaction ${pureEvent.transactionHash}`)
 *
 *  const terminate = subscribeToTokenTransfers(wallet, wallet.homeChain, tokens, onTransfer)
 *
 *  \* // Do something
 *
 *  terminate() \* // Close subscriptions
 * ```
 *
 * @exmample
 * ```ts
 *  const MyComponent() {
 *    const wallet = useWallet;
 *    const tokens = useTokens();
 *
 *    const onTransfer = useCallback((token) => console.log(token))
 *
 *    useEffect(() => {
 *      const terminate = subscribeToTokenTransfers(wallet, wallet.homeChain, tokens, onTransfer)
 *
 *      \* // Close event listeners on lifecycle end
 *      return terminate
 *    }, [])
 * }
 * ```
 */
export declare function subscribeToTokenTransfers(wallet: string | Wallet, chain: ChainId, tokens: Address[], callback: (token: Address, newBalance: BigNumber, e?: Log) => void): () => void;