Cosmos was co-founded by Jae Kwon and Ethan Buchman in 2014-2015. Jae Kwon, a Cornell University computer science graduate, previously built Tendermint, the consensus engine that powers Cosmos. Ethan Buchman, a distributed systems researcher, joined Kwon to develop the Tendermint consensus algorithm and later became CEO of Informal Systems, a key ecosystem developer.

Cosmos published its white paper in 2016 and held a token sale the following year. The Cosmos Hub officially launched in 2019 as the flagship blockchain of the ecosystem. Key developments include the 2023 launch of Replicated Security and the Liquid Staking Module, and in 2025, Cosmos Labs announced strategic initiatives for ATOM tokenomics overhaul under the ATOM 2.0 framework.

Cosmos is built on two core components: the Cosmos SDK for building application-specific blockchains and Tendermint Core providing Byzantine fault-tolerant consensus. Blockchains in the Cosmos ecosystem communicate through the Inter-Blockchain Communication protocol, enabling secure and decentralized cross-chain data and asset transfers without relying on centralized bridges.

ATOM has no fixed supply cap and uses a dynamic inflation mechanism. The inflation rate adjusts between 7 and 20 percent based on the staking participation ratio. When less than 66 percent of ATOM is staked, inflation rises to incentivize staking; above 66 percent, inflation decreases to allow market liquidity. The ATOM 2.0 proposal aims to transition to a controlled 1 percent annual inflation model.

ATOM holders participate in on-chain governance by voting on proposals and delegating their voting power to validators. Each upgrade or parameter change on Cosmos Hub can affect connected zones that rely on the Hub for security or bridges. Cosmos governance is notable for its active validator engagement and community-driven decision-making processes.

Cosmos supports a wide range of applications including decentralized finance, gaming, and real-world asset tokenization. The Cosmos Hub serves as the coordination center providing security and interoperability services to connected chains. The SDK has been used to build hundreds of app-specific chains including Osmosis, Juno, and Evmos, forming a thriving interchain economy.