Nice (NICE) is a decentralised cryptocurrency token built as a fork of SushiSwap, a decentralised exchange (DEX) protocol. The token operates with a dynamic supply model, where its total supply is pegged between 69 and 420 NICE tokens. This mechanism automatically adjusts token emissions and burn rates to maintain the supply within this range.

When the supply exceeds 420 NICE tokens, the emission rate is reduced by 100 times, and 20% of transaction amounts are burned. Conversely, if the supply drops below 69 NICE tokens, the emission rate increases by 100 times, and the burn rate is lowered to 1%. This inflation and deflation mechanism aims to self-regulate the token's supply without manual intervention.

The project has no premine, and its smart contracts are direct copies of SushiSwap contracts with added supply adjustment logic. Notably, SushiSwap's migrator contract, which has posed security risks in the past, has been removed for additional security. However, the project advises users to engage at their own risk, as there is no formal audit for its contracts.

Nice (NICE) primarily functions as a staking and liquidity incentive token. Users can stake Uniswap LP tokens in "felony pools" to earn NICE tokens. The staking mechanism rewards users with NICE tokens based on the pool's yield, which is dynamically adjusted based on the token's total supply.

Despite offering staking rewards, NICE is explicitly described as an experimental project with no defined utility or purpose beyond its inflation and deflation dynamics. It serves mainly as a decentralised finance (DeFi) experiment, exploring automated supply control mechanisms.