/**
 * Append-only spend ledger for x402-cfo agent.
 *
 * Records every payment decision — approved, denied, or failed —
 * with full context. This is the audit trail.
 */
export type LedgerEntryStatus = 'paid' | 'denied' | 'failed';
export interface LedgerEntry {
    /** ISO timestamp */
    timestamp: string;
    /** URL that was requested */
    url: string;
    /** Amount in dollars (e.g. "0.25") */
    amount: string;
    /** Currency (e.g. "USDC") */
    currency: string;
    /** Network (e.g. "base") */
    network: string;
    /** Payment status */
    status: LedgerEntryStatus;
    /** Human-readable reason (e.g. "budget approved" or "exceeds_hourly_limit") */
    reason: string;
    /** HTTP status code received (402, 200, etc.) */
    httpStatus?: number;
    /** Challenge ID if applicable */
    challengeId?: string;
    /** Transaction hash if payment was made */
    txHash?: string;
    /** Anomaly detection result at decision time, if anomaly check ran */
    anomalyResult?: {
        isAnomaly: boolean;
        zScore: number;
        baseline: number;
        multiplier: number;
        mode: 'enforce' | 'review' | 'off';
    };
}
export declare class Ledger {
    private entries;
    /** Record a ledger entry. */
    record(entry: LedgerEntry): void;
    /** Get all entries. */
    all(): readonly LedgerEntry[];
    /** Get entries by status. */
    byStatus(status: LedgerEntryStatus): LedgerEntry[];
    /** Get entries for a specific URL. */
    byUrl(url: string): LedgerEntry[];
    /** Total number of entries. */
    get size(): number;
    /** Export to JSON string. */
    toJSON(): string;
    /** Export to CSV string. */
    toCSV(): string;
}
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