NEO

NEO is a smart-contract platform using delegated Byzantine fault tolerance and a two-token model: holding NEO produces GAS, which pays transaction costs. NEO is also indivisible — the smallest unit is one whole token, which is unusual and has practical consequences.

Holding produces the fee token

NEO generates GAS simply by being held, so users are not required to buy a separate asset to transact. It also means the fee token's supply is a function of how much NEO is held rather than of a fixed schedule, tying network capacity economics to holder behaviour.

Indivisibility is a real constraint

NEO cannot be split into fractions, so the minimum transferable amount is one token. This affects exchange handling, staking mechanics and small transactions in ways divisible assets never encounter, and it is a design decision rather than a technical limitation.

One-block finality through dBFT

Elected consensus nodes agree before a block is published, so transactions are final immediately with no possibility of reorganisation. The trade is the standard Byzantine one: if too many consensus nodes fail simultaneously, the chain halts rather than forking.

Multi-language development

Contracts can be written in mainstream programming languages rather than a purpose-built one. That lowers the barrier for developers arriving from outside crypto, and it does not remove the need to understand blockchain-specific failure modes.

Where it sits

NEO was among the earliest smart-contract platforms and retains a defined technical position with immediate finality and enterprise-oriented governance. Its ecosystem is considerably smaller than the chains that captured developer attention in later cycles.