Systems and methods for account validation are disclosed. A method may include: receiving, at a validation computer program and from a client device, a request to validate payment information; querying, by the validation computer program, a plurality of validation systems with at least some of the payment information; receiving, at the validation computer program, a query response from each validation system; calculating, by the validation computer program, a risk score for each validation system based on a comparison between the payment information and the query response; weighting, by the validation computer program, the risk score for each validation system, wherein the weighting may be based on an accuracy of past risk scores for each validation system; aggregating, by the validation computer program, the weighted risk scores into a cumulative risk score; and outputting the cumulative risk score to the client device.