Questions about sendBitcoin

[Kntt]

When I call unisat.sendBitcoin('address', maxBalance), the unisat wallet prompts Insufficient btc utxo
maxBalance is get from unisat.getBalance

However, when using Unisat Send, fill in Max Balance, and it will be successful

I hope unisat.sendBitcoin will be consistent with unisat send

Because it's too difficult to calculate feeRate on the front end

[GGG888GGG]

@huanniangstudio @abangZ

[0xBeycan]

having same problem

[MatthewR586]

Same

[cloud6605]

sendBitcoin function needs extra utxo to pay for the gas. And you will get the same value as you input.
But on unisat wallet, it will include the gas fee when sending Max. And what you get will less than Max value.
You may get fee rate by mempool api. And the size is uaully fixed. Then you can know how much fee rate you set, how much gas fee you need to pay.