Lightning Loop is a service that allows users to make a Lightning transaction to an onchain Bitcoin address (Loop Out), or send on-chain Bitcoin directly into a Lightning channel (Loop In). Loop can help manage channel liquidity, for example, by emptying out a channel and acquiring inbound capacity (or refilling a depleted channel).

Lightning Loop uses submarine swaps to transact non-custodially, meaning that Loop is trustless. Loop Out transactions are batched to save on transaction fees.

Loop uses L402s for authentication.

{% embed url="https://lightning.engineering/api-docs/api/loop/" %}