import OnChainPxFeed from "./onChainPxFeed";
import { Provider } from "ethers";
/**
 * OnChainPxFeedAngle: get STUSD-USDC exchange rate
 */
export default class OnChainPxFeedAngle extends OnChainPxFeed {
    private delayMs;
    private fetchInProgress;
    constructor(rpcs: string[]);
    protected fetchPrice(delay: boolean): Promise<void>;
}
/**
 * Gets the price of one Angle stUSD in USDC from
 * on-chain
 * @param provider arbitrum provider
 * @returns STUSD-USDC
 */
export declare function STUSDToUSDC(provider: Provider): Promise<number>;