Calculate Algorand account minimum balance

min_balance.ts

const MIN_BALANCE_PER_ACCOUNT = BigInt(100000);
const MIN_BALANCE_PER_ASSET = BigInt(100000);
const MIN_BALANCE_PER_APP = BigInt(100000);
const MIN_BALANCE_PER_APP_BYTESLICE = BigInt(25000+25000);
const MIN_BALANCE_PER_APP_UINT = BigInt(25000+3500);
const MIN_BALANCE_PER_APP_EXTRA_PAGE = BigInt(100000);

/**
 * Get the minimum balance of an account.
 * @param client - An Algodv2 client.
 * @param addr - The address of the account.
 * @returns A promise that resolves to the minimum balance of the account, as a bigint.
 */
export async function getMinBalanceForAccount(client: algosdk.Algodv2, addr: string): Promise<bigint> {
    // This code is based on https://github.com/algorand/go-algorand/blob/1e5603c2691d7c0978d9688e5c89b0b0332528ec/data/basics/userBalance.go#L464

    const accountInfo = await client
        .accountInformation(addr)
        .setIntDecoding(algosdk.IntDecoding.BIGINT)
        .do();

    const totalSchema = accountInfo['apps-total-schema'];
    let totalByteSlices = BigInt(0);
    let totalUints = BigInt(0);
    if (totalSchema) {
        if (totalSchema['num-byte-slice']) {
            totalByteSlices = totalSchema['num-byte-slice'];
        }
        if (totalSchema['num-uint']) {
            totalUints = totalSchema['num-uint'];
        }
    }

    const totalExtraPages = accountInfo['apps-total-extra-pages'] || BigInt(0);

    const localApps = accountInfo['apps-local-state'] || [];
    const createdApps = accountInfo['created-apps'] || [];
    const assets = accountInfo['assets'] || [];

    return MIN_BALANCE_PER_ACCOUNT +
        MIN_BALANCE_PER_ASSET * BigInt(assets.length) +
        MIN_BALANCE_PER_APP * BigInt(createdApps.length + localApps.length) +
        MIN_BALANCE_PER_APP_UINT * totalUints +
        MIN_BALANCE_PER_APP_BYTESLICE * totalByteSlices +
        MIN_BALANCE_PER_APP_EXTRA_PAGE * totalExtraPages;
}