How do I include a tip for transactions using Polkadot.JS/API

Question

I am attempting to add a tip to a transaction in the following manner:

const batch = await api.tx.utility.batch([...]);
batch.tip = 1;

It appears that tip is a read-only property and I'm receiving an error. How may I add a tip to this transaction?

Answer 1

Your batch method has a signAndSend function attached to it. signAndSend takes in Partial<SignerOptions> as a second parameter where you would attach your tip. It would look like the following:

const batch = await api.tx.utility.batch([...]).signAndSend(from, { tip });

SignerOptions can be found here.

The following methods that take in SignerOptions can be found here for SubmittableExtrinsics