A system and method for routing ATM transactions. A transaction request is received at an external application programming interface (API) associated with an account holder. The external API runs on a first processor. The transaction request is validated and authorized at the external API. Information about the transaction is forwarded from the external API to an internal API associated with an automated teller machine (ATM). The internal API runs on a second processor. A unique identifier is generated for the transaction request and provided to a user. The unique identifier is received from the user at the ATM without the user presenting any card and without connecting a mobile device of the user to the ATM. The unique identifier is provided from the ATM to the internal API to confirm a validity of the transaction. The transaction is implemented at the ATM by either dispensing cash or accepting a deposit.