import type { EthernaGatewayClient } from ".";
import type { RequestOptions } from "..";
export declare class PostageClient {
    private instance;
    constructor(instance: EthernaGatewayClient);
    /**
     * Topup batch (increase TTL)
     *
     * @param batchId Id of the swarm batch
     * @param byAmount Amount to add to the batch
     * @param opts Request options
     */
    topupBatch(batchId: string, byAmount: number | string, opts?: RequestOptions): Promise<boolean>;
}
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