如何使用bitcore-lib（NodeJs）获得最低交易费用？

Question

I'm doing a transaction of BTC using bitcore-lib nodejs package. when I set 1 satoshi fee per byte it shows an error like "Fee is too small: expected more than x but got y" . Is there any way to get that x value to set fee?

let tx = bitcore.Transaction();

tx.from(utxos);
tx.to(toAddress,sendAmountInSatoshi);
tx.change(fromAddress);
tx.fee(fee);
tx.sign(pKey);

Answer 1

While I'm not sure if it's part of the API specification you can use their _estimateFee() method:

https://github.com/bitpay/bitcore-lib/blob/86583608814dfc513e675d7b853806caf9bd95e7/lib/transaction/transaction.js#L242

Answer 2

If you are using the bitcoin testnet make sure to include the minimum amount of fees which is 3000 satoshis .

You can set the fees as low as you want in the livenet , but the testnet require this as the minimum amount so as to ensure people continue mining on the testnet to help the developer community .

Cheers!