/**
 * Twig API Server
 *
 * Exposes Twig core functions as HTTP endpoints.
 * TWIG_PAYMENT_ADDRESS must be set — process.exit(1) if missing.
 *
 * Endpoints:
 *   GET  /health    — liveness probe
 *   POST /analyze   — free, analyzes a tool description
 *   POST /optimize  — free, generates optimized variants
 *   POST /monitor   — x402-gated ($0.50), full monitor diff
 */
import express from 'express';
export interface AnalyzeBody {
    url?: string;
    description?: string;
    name?: string;
}
export interface OptimizeBody {
    description: string;
    name?: string;
}
export interface MonitorBody {
    url: string;
    txHash?: string;
}
export declare function createApp(paymentAddress: string): express.Application;
export declare function startServer(): void;