An open protocol for cities to discover, exchange, and trace material and product flows across city boundaries — keeping circular value local while meeting emerging EU data and product passport requirements.
Local Optimization with Overflow Protocol
An open, federated standard for tracking material and product flows between cities. LOOP enables municipalities to share surplus resources, coordinate circular economy initiatives, and maintain data sovereignty while participating in regional exchanges — built around MaterialDNA, ProductDNA, LoopCoin, and LoopSignal.
Read the specPrepare your infrastructure for EU Digital Product Passport mandates, circular procurement, and waste traceability obligations (DIWASS, PPWR, Battery Passport) — using open standards that stay under municipal control.
City portals →Run lab nodes, integrate LOOP flows into existing material management systems, and participate in federated exchanges between municipalities and circular economy platforms.
Implementation guide →Explore open schemas, contribute to the protocol specification, and test circular economy models using the lab API and validated example payloads.
Schema library →Full specification, schemas, and security requirements.
Learn moreJSON-LD contexts, JSON Schemas, and example payloads.
Learn moreExplore how city portals will surface local material flows and initiatives (lab concept, no live deployments yet).
Learn moreRFC process, decision-making, and community proposals.
Learn moreWhether you represent a city, a research lab, or a circular economy operator — register your interest to help define the first controlled pilots.
