Disclosed are methods, systems, and devices for preventing payments to unintended beneficiaries. A service provider system may receive, from a user device of a user, a payment request to transfer funds from a source account to an identified destination account. A beneficiary system may be identified, and a validation request (e.g., an API call) may be transmitted to the beneficiary system. The service provider system may receive from the beneficiary system a transmission indicating whether the destination account is associated with the recipient identified in the payment request. The user may be alerted if the account number for the destination account is not validated.