It's been a few years since this was visited in any depth.
I used ALLY bank for most of my ACH hub activities. They have LARGE ACH limits in, and out. They are also no charge.
ONLINE, they are limited on entries. So if I need to add a new one, I have to delete an existing one, and start over with getting it activated.
ALSO - they have me limited to a three day delivery (one credit union did not handle the test deposits and retrieval in proper sequence, so it looked like a failed ACH attempt to them).
SOOOoooo - looking for recommendations for ACH HUB that includes LARGE ACH limits, quick turn-around, AND ability to have large number of authorized external linked accounts.
American Express looked good, but they only allow 3 linked accounts, and 6 transactions per month .... so won't work for me.
Alliant has too low of daily limits, so no go.
I see references to Fidelity and SOFI ... but not the details of ACH limits.
Anybody got any current recommendations that might be better than ALLY?