There are no eligibility criteria tied to third party ratings for carbon credits. However, third party ratings agencies - such as BeZero, Calyx Global, Renoster, and Sylvera - provide an extra layer of information about project quality and performance intended to increase the overall integrity and climate impact of the voluntary carbon market (VCM). These ratings are increasingly used to make informed purchases in the VCM, since they help with navigating the inherent risk and uncertainty of the VCM.