Fusion is an inter-operable cryptofinance platform that is being developed by the creators of Qtum and VeCahin. They hope to address many of the usability, scalability, and interoperability issues that have plagued other blockchain projects. Fusion's goal is to facilitate financial services for cryptocurrencies across different blockchains, and to enable additional financial services in the cryptofinance sphere.
Fusion will use distributed nodes to generate and manage the private keys of other blockchains. This will enable a new layer to operate on top of other tokens. This layer will "fuse" them and will allow the execution of smart contracts across different blockchains. Off-chain values can also be mapped on the chain and interact with the tokens

The Yearn.Finance token fuels the Yearn Finance network, which was designed to help maximize profits from opportunities created by collateralized lending protocols. The Yearn Finance ecosystem consists of several platforms that enable users to seamlessly leverage the arbitrage opportunities created on Ethereum-based lending services. It includes platforms that are designed to switch lenders to optimize yields, leverage stablecoin trades, automate liquidations, and automate credit allocations. The Yearn.Finance token acts as a governance and payment mechanism for a platform that is specifically designed to help optimize profits across multiple DeFi lending service providers.