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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?

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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

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