This notice posts a limited-sources justification for Technical Support for Payment Systems and Rates, required within 14 days after an order exceeding the simplified acquisition threshold, and states it is not an active procurement opportunity. The agency intends to continue highly specialized ratesetting and enterprise architecture work performed by Acumen since 2010, identifying Acumen as the only responsible source. The justification cites Acumen’s institutional knowledge, proprietary tools, and deeply integrated models as essential to avoid operational risk, delays, duplicated costs, and disruption to SAS Conversion and rulemaking schedules. The acquisition is described as a logical follow-on under GSA MAS SIN 541611, preserving continuity and prior investments through a short-term follow-on. That follow-on is intended to allow full and open competition in 2028, with time to develop updated metrics, engage industry, and design a competitive strategy.