Mercury Protocol (GMT) started in 2018 and finished in 2019, with a total supply of 1 billion coins. The team/founder is Ryan Ozonian, The main reason this coin was listed is desertion.

(from old site) Modern communication is outdated. Centralized communication platforms built on private servers are only as secure as their weakest defense, user privacy is habitually violated as service providers sell behavioral data to advertisers, and content is restricted to a single platform. The solution is the Mercury Protocol, an open-source project for communication platforms to utilize decentralized blockchain technology at minimal cost. Any communication platforms that integrate the Mercury Protocol will be able to exchange messages and content, increase user privacy through pseudonymity, leverage tokens to encourage user participation, and provide stronger network security than any private system that has a single point of failure.