Predeployed smart contract that stores and manages access to sFUEL received from block rewards and gas fees.
To use Etherbase contract predeployed in genesis block use etherbase-predeployed library. It's available for python and is distributed as a pip package.
For using Etherbase in external projects there is an @skalenetwork/etherbase-interfaces npm package containing signatures of all publicly available functions.