he AgStack Field Carbon Model enables field-level carbon flux estimation by adapting NASA’s Soil Moisture Active Passive (SMAP) Level 4 Carbon (L4C) model for agricultural applications. Designed for farmers, advisors, and developers, the model facilitates measurement, reporting, and verification (MRV) of carbon sequestration efforts, supporting participation in carbon credit markets. The Python-based system can be deployed on cloud platforms and integrates with public or private data sources, promoting scalable and transparent carbon accounting in agriculture.