/**
 * SwapProvider Interface — Abstracts over different DEX routing backends
 *
 * Implementations: 0x API (aggregated) and Aerodrome Router (direct).
 * Strategy: try 0x first (better routing), fall back to Aerodrome for core pairs.
 */
import type { SwapQuoteParams, SwapQuote } from '../types';
export interface SwapProvider {
    /** Provider name (e.g., '0x', 'aerodrome') */
    readonly name: string;
    /**
     * Get a swap quote.
     * @param params - Sell/buy tokens, amount, taker address, slippage
     * @returns Quote with calldata for execution
     */
    getQuote(params: SwapQuoteParams): Promise<SwapQuote>;
}
export declare class SwapProviderError extends Error {
    readonly provider: string;
    readonly retryable: boolean;
    readonly statusCode?: number;
    constructor(message: string, provider: string, retryable?: boolean, statusCode?: number);
}
/**
 * Auto-select provider: try 0x first, fall back to Aerodrome.
 */
export declare function getQuoteWithFallback(providers: SwapProvider[], params: SwapQuoteParams): Promise<SwapQuote>;