在 Solana 上保持账户活跃会产生数据存储成本，称为 租金。在计算时，您需要考虑您打算在帐户中存储的数据量。如果帐户关闭，可以全额收回租金。

import { Connection, clusterApiUrl } from "@solana/web3.js";

const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

// allocate 1.5k bytes of extra space in the account for data
const space = 1500;

const lamports = await connection.getMinimumBalanceForRentExemption(space);
console.log("Minimum balance for rent exemption:", lamports);