/**
 * Optional FeeSplitter release keeper (OFF by default).
 *
 * When `KEEPER_ENABLED=true`, periodically reads USDC balances of merchant
 * FeeSplitter addresses (`payTo` from the registry) and calls `release()` when
 * balance >= `KEEPER_MIN_USDC` (default 1_000_000 = $1 USDC).
 *
 * Never enable on Render by default — gas for `release()` can exceed the 0.1%
 * fee on sub-cent payments; the min-balance gate exists for that reason.
 * Do not put private keys in the repo.
 *
 * Dry-run: `KEEPER_DRY_RUN=true` logs would-release without sending txs.
 * Live release needs `KEEPER_PRIVATE_KEY` + RPC (`KEEPER_RPC_URL` or public Base default).
 */
import { type Hex } from "viem";
import type { TollgateConfig } from "./config.js";
import type { MerchantRegistry } from "./merchants.js";
/** Default: $1 USDC (6 decimals). */
export declare const DEFAULT_KEEPER_MIN_USDC = 1000000n;
/** Default poll interval: 1 hour. */
export declare const DEFAULT_KEEPER_INTERVAL_MS = 3600000;
export interface KeeperConfig {
    enabled: boolean;
    dryRun: boolean;
    privateKey: Hex | undefined;
    rpcUrl: string | undefined;
    intervalMs: number;
    minUsdc: bigint;
    network: string;
    merchants: MerchantRegistry;
}
export interface KeeperHandle {
    /** Stop the interval timer. */
    stop: () => void;
    /** Run one tick immediately (tests / ops). */
    tick: () => Promise<void>;
}
export declare function loadKeeperConfig(env: NodeJS.ProcessEnv, tollgate: Pick<TollgateConfig, "network" | "merchants">): KeeperConfig;
export interface KeeperLogger {
    info: (msg: Record<string, unknown>) => void;
    error: (msg: Record<string, unknown>) => void;
}
/**
 * Start the optional release keeper. Returns null when disabled or misconfigured.
 */
export declare function startFeeSplitterKeeper(config: KeeperConfig, logger?: KeeperLogger): KeeperHandle | null;