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Fintech services like PayPal, and Cash App have a "instant" method already which pushes funds through a payment as a debit card transaction (like a refund from a merchant would, but instant).

Instant Deposits are subject to a 0.5% -1.75% fee (with a minimum fee of $0.25) and arrive instantly to your debit card.

https://cash.app/help/us/en-us/3073-cash-out-speed-options

I suppose this FedNow would be cheaper.