The Lightning Network makes money by charging a small processing fee. These fees are a combination of routing charges, open and closing channels, and Bitcoin’s standard transaction fees.
Compared with the Bitcoin blockchain which can process around seven transactions per second, the Lightning Network can process over a million transactions in the same amount of time. So, with a base transaction fee of 1 Satoshi (or 0.00000001 BTC/USD 0.4), the Lightning Network is one of the cheapest ways to transact on the Bitcoin blockchain.