import { AxiosInstance } from 'axios';
import { Logger } from './utils/logger';
import { ModelPricingInfo, UsageInfo, OpenRouterConfig } from './types';
export declare class CostTracker {
    private priceCache;
    private axiosInstance;
    private logger;
    private refreshIntervalMs;
    private refreshTimer;
    private isFetchingPrices;
    private initialPricesProvided;
    private apiBaseUrl;
    constructor(axiosInstance: AxiosInstance, logger: Logger, config: Pick<OpenRouterConfig, 'enableCostTracking' | 'priceRefreshIntervalMs' | 'initialModelPrices'> & {
        apiBaseUrl: string;
    });
    fetchModelPrices(): Promise<void>;
    private updatePriceCache;
    calculateCost(modelId: string, usage: UsageInfo | null | undefined): number | null;
    getModelPrice(modelId: string): ModelPricingInfo | undefined;
    getAllModelPrices(): Record<string, ModelPricingInfo>;
    private startPriceRefreshTimer;
    stopPriceRefreshTimer(): void;
    destroy(): void;
}