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I recently initiated a transfer from a American Express Business Checking account to a business checking account at a different bank. The funds were deposited the same day which seemed way too fast to be ACH. Does anyone know how the funds could be transferred so quickly?

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Your receiving bank can very quickly get notification of the incoming transfer, and 'spot' you an arbitrary amount (or all) while it _actually_ clears in the background.

Same day ACH has been available since 2017 and expanded in 2021. It's very slightly more expensive for the bank.

Whether or not the funds are made available mostly depends on how much the receiver trusts the transmitting account; even if it shows up the same day it still might turn out to be fraud a few days later.

Most likely they used same day ACH. They could have also used some form of RTP (Real time payments). But it's probably same day ACH.

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