Blockchain developer can facilitate and offer the data retrieving, formatting, other computation and uptime services in ChainLink by becoming a ”Node Operator” for any user or business. The service fee will be paid in LINK based on the resource that operator required. There’ll be a “Reputation System” that allow users to rate the Node operator depending on their request response to incentivizing high quality service.
LINK is available to purchase on Ethereum Blockchain because Link is an ERC-20 Token. According to the whitepaper, LINK is also has the additional ERC223 “transfer and call” functionality of transfer (address, uint256, bytes), that allows tokens to be received and processed by contracts within a single transaction in LinkChain. According to coinmarketcap and other sources, the total supply of LINK at the end of 2018 is 1 billion tokens (1,000,000,000 LINKs) with circulating 350 million tokens (350,000,000 LINKs), which equal to 35% that sold in ICO and presale, 350 million (35%) are for data providers, node incentive & support 300 million (30%) held by team for development, marketing etc.