How to compute the fees of a block

Question

Having a block with all the extrinsics/events, what code should I write (preferably using polkadotJs) to compute the total amount of fees paid?

Answer 1

here you go:

const at = await api.rpc.chain.getFinalizedHead();
const block = await api.rpc.chain.getBlock(at);
const blockFees = await Promise.all(block.block.extrinsics.map(
    (ext) => api.rpc.payment.queryInfo(ext.toHex(), at.toHex()))
);
blockFees.forEach((x) => console.log(x.partialFee.toHuman()))

Although, note that this does not take tips into account.