Systems and methods are disclosed for online authentication of online attributes. One method includes receiving an authentication request from a rely party, the authentication request including identity information to be authenticated and credential information to be authenticated; determining whether a user account is associated with the received identity information by accessing an internal database; accessing user data of the user account determined to be associated with received identity information; determining authentication data to obtained from a user associated with the user account based on the user data of the user account and the credential information to be authenticated; transmitting a request for authentication data; receiving authentication data associated with the user; transmitting authentication data associated with the user; and receiving an authentication result from the verification data source server for the user associated with authentication data.