/**
 * Client-Side Price Oracle Service
 *
 * Fetches cryptocurrency prices directly from browser
 * Supports CoinGecko API and can be extended to Chainlink oracles
 */
export interface PriceData {
    currency: string;
    price: number;
    lastUpdated: number;
}
export interface PriceServiceConfig {
    coingeckoApiKey?: string;
    cacheTTL?: number;
    autoUpdate?: boolean;
    updateInterval?: number;
}
export declare class PriceService {
    private cache;
    private config;
    private updateTimer;
    private static readonly STORAGE_KEY;
    private static readonly DEFAULT_CACHE_TTL;
    private static readonly DEFAULT_UPDATE_INTERVAL;
    constructor(config?: PriceServiceConfig);
    /**
     * Fetch prices from CoinGecko API
     */
    fetchPricesFromCoinGecko(coinId?: string, currencies?: string[]): Promise<Map<string, PriceData>>;
    /**
     * Get price for a specific currency
     */
    getPrice(currency: string): number | null;
    /**
     * Get price data with metadata
     */
    getPriceData(currency: string): PriceData | null;
    /**
     * Convert fiat to DOT
     */
    convertFiatToDOT(amount: number, fiatCurrency: string): string;
    /**
     * Convert DOT to fiat
     */
    convertDOTToFiat(dotAmount: string, fiatCurrency: string): number;
    /**
     * Check if price is stale
     */
    isPriceStale(currency: string): boolean;
    /**
     * Check if any cached prices exist
     */
    hasCachedPrices(): boolean;
    /**
     * Get all cached prices
     */
    getAllPrices(): Map<string, PriceData>;
    /**
     * Get last update timestamp
     */
    getLastUpdateTime(): number;
    /**
     * Manually update prices
     */
    updatePrices(coinId?: string, currencies?: string[]): Promise<Map<string, PriceData>>;
    /**
     * Start automatic price updates
     */
    startAutoUpdate(): void;
    /**
     * Stop automatic price updates
     */
    stopAutoUpdate(): void;
    /**
     * Clear price cache
     */
    clearCache(): void;
    /**
     * Save cache to localStorage for persistence across page reloads
     */
    private saveCacheToStorage;
    /**
     * Load cache from localStorage
     */
    private loadCacheFromStorage;
    /**
     * Remove cache from localStorage
     */
    private removeCacheFromStorage;
    /**
     * Cleanup on destroy
     */
    destroy(): void;
}
/**
 * Format DOT amount for display
 */
export declare function formatDOTAmount(amount: string, decimals?: number): string;
/**
 * Validate DOT amount
 */
export declare function validateDOTAmount(amount: string): boolean;
/**
 * Validate fiat amount
 */
export declare function validateFiatAmount(amount: number, currency: string): boolean;
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