/**
 * Hard spending guard. An LLM holds this wallet, so every outgoing payment is
 * checked against a per-payment cap AND a daily cap. Fail-closed: if the state
 * file is unreadable, spending starts from the cap (i.e. blocked), never from 0.
 */
export declare class SpendGuard {
    readonly maxPaymentUsd: number;
    readonly dailyCapUsd: number;
    private readonly statePath;
    constructor(maxPaymentUsd: number, dailyCapUsd: number, statePath?: string);
    private today;
    spentToday(): number;
    remainingToday(): number;
    /** Throws with an agent-readable message if the payment must not happen. */
    check(amountUsd: number, label: string): void;
    record(amountUsd: number): void;
}
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