MagicSpend++ Spend Now, Debit Later

[vaibhavchellani]

@shreyas-londhe

Paymasters on each chain query that txn_amount > CAB, and then process the txn further. My doubt is, is there a process which updates the CAB once a paymaster queries? If there is a process to update, I believe the other paymasters will have to wait until the CAB is updated and will lead to increased finality time for the other 2 transactions.

thanks for reading the proposal and for the question, I can see where the confusion is stemming from and am happy to help resolve it

basically paymaster needs a consistent view of total available balance for the user to spend, there are 3 pieces of information the paymaster would need for this:

• locked amount in SCWs
• amount spent on-chain but not debited yet (can be tracked onchain)
• amount in pending (can be looked up in bundler mempool for a specific paymaster)

available_balance = lockedAmount - amountSpentButNotDebited - amountInPending

The above information is available real time and is not blocked by anything onchain, hopefully that helps, but please dont hesitate if you have more questions