123Carbon and ZERO44 have announced a strategic partnership aimed at linking the voluntary and mandatory carbon markets for shipowners, operators, and charterers.

The collaboration integrates 123Carbon’s carbon insetting registry with ZERO44’s SaaS platform for CO₂ management, allowing companies to allocate low-carbon fuel impacts either to regulatory compliance or voluntary carbon insetting, and to monitor vessel compliance in real time.

The combined system also enables users to assign specific fuel volumes for compliance or voluntary use, the companies note, avoiding double-counting.