/**
 * Recursively sort all object keys alphabetically.
 * Exact port of Python SDK's sort_json_keys().
 */
export declare function sortJsonKeys(value: unknown): unknown;
/**
 * Prepare the message string for signing.
 * Exact port of Python SDK's prepare_message().
 *
 * Header must contain: type, timestamp, expiry_window
 * Returns compact JSON with sorted keys and payload nested under "data".
 */
export declare function prepareMessage(header: {
    type: string;
    timestamp: number;
    expiry_window: number;
}, payload: object): string;
/**
 * Create a signing header with current timestamp.
 */
export declare function createHeader(type: string, expiryWindow?: number): {
    type: string;
    timestamp: number;
    expiry_window: number;
};
/**
 * Sign a message using a wallet adapter's signMessage function.
 * Used in browser context with Phantom/Solflare/etc.
 *
 * @param header - Operation header (type, timestamp, expiry_window)
 * @param payload - Operation payload
 * @param signMessage - Wallet adapter's signMessage function
 * @returns [message, base58EncodedSignature]
 */
export declare function signWithWallet(header: {
    type: string;
    timestamp: number;
    expiry_window: number;
}, payload: object, signMessage: (message: Uint8Array) => Promise<Uint8Array>): Promise<[string, string]>;
/**
 * Build a signed request body for REST API POST.
 * Flattens payload to top level and adds account, signature, timestamp, expiry_window.
 */
export declare function buildSignedRequest(operationType: string, payload: object, account: string, signMessage: (message: Uint8Array) => Promise<Uint8Array>, expiryWindow?: number): Promise<Record<string, unknown>>;
/**
 * Build a signed request with agent wallet.
 * Used when an agent wallet is trading on behalf of a main account.
 */
export declare function buildAgentSignedRequest(operationType: string, payload: object, mainAccount: string, agentWallet: string, signMessage: (message: Uint8Array) => Promise<Uint8Array>, expiryWindow?: number): Promise<Record<string, unknown>>;