Mastercard said Monday that it is introducing Stablecoin Security, a service that will let financial institutions assess stablecoin payment risks before funds move onchain. Borderless.xyz and Keyrails are the initial partners. Mastercard said the service will launch first in North America, with worldwide commercial availability expected in 2027. The service checks the source of funds and possible links to financial crime, then supplies risk information through an API for existing bank fraud and compliance systems.