import type { RequestHandler } from "express";
import { type TollgateConfig } from "./config.js";
export interface X402TollgateOptions {
    /** Seller receive wallet (EOA). Required — validated with EIP-55 / isAddress. */
    seller: string;
    /** Operator feeCollector (default: fixed Plan A address from env / OPERATOR_FEE_COLLECTOR). */
    feeCollector?: string;
    /**
     * Fee-free threshold in USDC atomic units (6 decimals).
     * Default 10_000_000 ($10). Single payment strictly below → payTo = seller.
     */
    feeFreeBelowUsdc?: bigint | number | string;
    /** FeeSplitterFactory address (required for payments ≥ threshold). */
    factoryAddress?: string;
    /** Basis points for FeeSplitter (default 10 = 0.1%). */
    feeBps?: number;
    /** Override process.env when building TollgateConfig. */
    env?: NodeJS.ProcessEnv;
    /**
     * Path prefix gated by this middleware (default `""` so `app.use('/v1', …)`
     * charges every path under the mount).
     */
    gatedPrefix?: string;
}
/**
 * Permissionless seller Express middleware.
 *
 * @example
 * ```ts
 * import { x402Tollgate } from "x402-micro-tollgate";
 * app.use("/v1", await x402Tollgate({ seller: process.env.SELLER! }));
 * ```
 *
 * payTo rules (x402 `exact` + EIP-3009 → credits `payTo` only; no same-tx split):
 * - amount < $10 USDC → seller EOA (0 protocol fee)
 * - amount ≥ $10 → CREATE2 FeeSplitter; call `release()` later (99.9% / 0.1%)
 *
 * Invalid `seller` throws at init (hard fail). Does not enable KEEPER.
 */
export declare function x402Tollgate(options: X402TollgateOptions): Promise<RequestHandler>;
/** Build TollgateConfig for a permissionless seller (sync; for tests / custom wiring). */
export declare function loadSellerConfig(options: X402TollgateOptions): TollgateConfig;