import Big from "big.js";
import { ApiPromise } from "@polkadot/api";
/**
 * @category PolkaBTC Bridge
 * The type Big represents DOT or PolkaBTC denominations,
 * while the type BN represents Planck or Satoshi denominations.
 */
export interface FeeAPI {
    /**
     * @param amount Amount, in BTC, for which to compute the required
     * griefing collateral
     * @param griefingCollateralRate
     * @param oracleAPI
     * @returns The griefing collateral, in DOT
     */
    getGriefingCollateral(amount: Big, griefingCollateralRate: Big): Promise<Big>;
    /**
     * @param feesPolkaBTC Satoshi value representing the BTC fees accrued
     * @param feesDOT Planck value representing the DOT fees accrued
     * @param lockedDOT Planck value representing the value locked to gain yield
     * @param dotToBtcRate (Optional) Conversion rate of the large denominations (DOT/BTC as opposed to Planck/Satoshi)
     * @returns The APY, given the parameters
     */
    calculateAPY(feesPolkaBTC: Big, feesDOT: Big, lockedDOT: Big, dotToBtcRate?: Big): Promise<string>;
    /**
     * @returns The griefing collateral rate for issuing PolkaBTC
     */
    getIssueGriefingCollateralRate(): Promise<Big>;
    /**
     * @returns The griefing collateral rate for the Vault replace request
     */
    getReplaceGriefingCollateralRate(): Promise<Big>;
}
export declare class DefaultFeeAPI implements FeeAPI {
    private api;
    private oracleAPI;
    constructor(api: ApiPromise);
    getGriefingCollateral(amount: Big, griefingCollateralRate: Big): Promise<Big>;
    getIssueGriefingCollateralRate(): Promise<Big>;
    getReplaceGriefingCollateralRate(): Promise<Big>;
    calculateAPY(feesPolkaBTC: Big, feesDOT: Big, lockedDOT: Big, dotToBtcRate?: Big): Promise<string>;
}