Some institutions have different numbers for each transfer type (ACH and WIRE). So, you must check which number should be used, according to the transfer you intend to carry out.
If you are transferring to another US-based account you own, the transfer type available in the Nomad app currently is WIRE. To carry out this transfer, you must enter a routing number specific to this type of operation (Wire Routing Number).
If you are sending the amount to a third-party US-based account, the transfer type available in the Nomad app is ACH. To carry out this transfer, it is necessary to enter a routing number specific to this type of operation (ACH Routing Number).
This information is consulted directly with the institution that will receive the transfer.