Abstract: A method of rapidly onboarding a user for access to trade on a cryptocurrency exchange via a payment network is disclosed herein. The method can include receiving an application program interface (“API”) call including a request to authenticate the user for access to trade on the cryptocurrency exchange, wherein the request includes information associated with an account of the user, transmitting the request to an issuer system associated with the account, receiving a verification result from the issuer system, wherein the verification result is based on user identifying information previously authenticated by the issuer system in association with the account, wherein the verification result is indicative of an authenticity status of the user, and responding to the request by transmitting an indication of the verification result to the cryptocurrency exchange.