/**
 * Durable payment state for the builder read loop.
 *
 * Two responsibilities, one 0600 file (`~/.vana/app/receipts.json`):
 *
 * - Payment nonces per payer. The gateway rejects a reused (payer, nonce)
 *   pair, and the SDK's default nonce source is process-local seeded at 1,
 *   which breaks on the second CLI invocation. Nonces here only move
 *   forward.
 * - Receipts: the exact `X-PAYMENT` header (plus amount/asset metadata) of a
 *   settled read, keyed by network, grant, and scope. A later read replays
 *   the header first, so a retry after a failure never settles a second fee
 *   for data the app already paid for.
 */
export interface StoredReceipt {
    /** The signed X-PAYMENT header exactly as sent. */
    header: string;
    /** Base-unit decimal amount the header settles. */
    amount: string;
    /** Asset address (zero address = native VANA). */
    asset: string;
    /** ISO timestamp the CLI captured the header. */
    capturedAt: string;
    /** Payment metadata echoed by the Personal Server, when any. */
    payment?: Record<string, unknown>;
}
export declare function receiptKey(network: string, grantId: string, scope: string): string;
export interface ReceiptsStore {
    /** Next monotonically-increasing payment nonce for a payer; persisted. */
    nextNonce(payerAddress: string): bigint;
    getReceipt(key: string): StoredReceipt | null;
    saveReceipt(key: string, receipt: StoredReceipt): void;
    /** Drop a receipt the server refused (stale version, expired nonce). */
    dropReceipt(key: string): void;
}
export declare function createReceiptsStore(filePath?: string): ReceiptsStore;
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