Being a master node
Bitcoin is usually used as an umbrella term for all the cryptocurrencies and though experts would say the return for being a bitcoin master node is not all that profitable, you can still serve as a master node for several other cryptocurrencies and get a reward for your service to the blockchain.

Masternode is a dedicated node that keeps track of blockchain in real-time. Much like bitcoin full nodes, they are always up and running.

In addition to saving, validating and announcing valid transactions to other nodes, master nodes also perform other tasks with the blockchain including ensuring smooth protocol operations, governing voting events etc Next to validating, saving and broadcasting transactions, master nodes sometimes also facilitate other events on the blockchain-dependent on their nature, such as governing voting events etc. For their dedicated service, they are heavily incentivized. It typically depends on the type of cryptocurrency but Dash, PIVX, Blocknet, Stakenet, and Zcoin are the 5 major coins that have the best incentives for a master node.