Foam is an open convention for decentralized, geospatial information markets. The convention is intended to enable clients to fabricate an accord-driven guide of the world that can be trusted for each application. As innovation advances and changes, maps need to change as well. FOAM secures physical space on the blockchain, tackling the intensity of Ethereum with a cryptographic programming utility token used to give computational work and confirmation to the arrange. The part components of the FOAM convention are intended to give spatial conventions, benchmarks and applications that bring geospatial information to blockchains and enable an agreement driven guide of the world. Token systems and cryptoeconomics support the components of FOAM furthermore, engage the disseminated clients to facilitate and communicate in a decentralized and permissionless design.