What Is Immutable X ( #IMX )? Explained Immutable X is a Layer 2 scaling solution for #NFTs (Non-Fungible tokens) projects on the Ethereum Blockchain. It offers zero gas fees, carbon neutrality, and the ability to process 9000 transactions per second (TPS). Immutable X uses #StarkWare ’s zero-knowledge-proof technology, Starkey, for scalability and security.