I'm trying to send all SOL from one wallet to another. My main problem is that I have many wallets with a small amount of SOL so I want to save as much SOL as I can.
async function transferToMain(){
const fromKeypair = Keypair.generate();
const toKeypair = Keypair.generate();
const gasFee = 0; // Is there a safe amount?
const lamports = await connection.getBalance(fromKeypair.publicKey) - gasFee;
console.log(`FROM ${fromKeypair} TO ${toKeypair} AMOUNT ${lamports} BALANCE ${lamports + gasFee}`)
const transaction = new Transaction().add(SystemProgram.transfer({
fromPubkey: fromKeypair.publicKey,
toPubkey: toKeypair.publicKey,
lamports: lamports
}));
const signature = await sendAndConfirmTransaction(
connection,
transaction,
[fromKeypair]
)
console.log('SIGNATURE: '+ signature)
}
Trying to send SOL exactly equal to balance will yield
SendTransactionError: failed to send transaction: Transaction simulation failed: Transaction leaves an account with a lower balance than rent-exempt minimum
I've tried to add a small amount for transfer fee, but it is prone to failure because gas fee fluctuates. The source code shows that it just takes BigInt/ number type for the lamport argument - and doesn't handle special input : transfer, transferParams.
On the CLI, we can do something like
$solana transfer --from <FROM_ADDRESS> <RECIPIENT_ADDRESS> ALL
I'm wondering if there is a similar way to do it on the JS API?
