From a Request for Information posted by the Social Security Administration (emphasis added):
The Social Security Administration (SSA) has a need to acquire contractor services to provide an online wage verification system that SSA can use to substantiate employment, wage amounts, and other employment-related data. The SSA is seeking information on how an interested contractor could meet our requirement to establish a data exchange with payroll data providers to provide monthly wages per individual and employer data for use in SSA’s administration of the Supplemental Security Income (SSI) Program on a monthly basis.