Multiple primary and quasi-primary sources, including official and industry-adjacent publications, indicate that a U.S. federal banking regulator—specifically the Office of the Comptroller of the Currency—has issued or proposed rules under the GENIUS Act framework concerning payment stablecoins. These proposals include provisions limiting or regulating 'rewards' or yield programs tied to stablecoins, with the clear intent of preventing banks from offering reward-like features that could resemble interest-bearing deposit products on unbacked digital assets. This interpretation is supported by contemporaneous reporting and testimony references linking OCC proposals to restrictions on stablecoin-related incentive mechanisms. Other sources, including CFTC and NCUA regulatory notices, further demonstrate federal oversight expanding into digital asset activities. No credible or authoritative source in the provided set contradicts or refutes the claim. Therefore, the statement that a U.S. federal banking regulator has proposed rules to limit rewards associated with stablecoins is accurate within the context of these 2026 regulatory developments.