# Loop

> Lightning ↔ on-chain liquidity — non-custodial submarine swaps for LND nodes, fee for service

Lightning Labs' non-custodial liquidity bridge — Loop Out and Loop In move balance between Lightning and on-chain via submarine swaps.

- Category: liquidity
- Payment methods: lightning, onchain
- KYC: none
- Custody: self-custody (atomic submarine swaps)
- Automatability: api-no-account — API with no account — payment or a key is the credential; zero human onboarding
- Auth: none — your own LND node is the prerequisite
- Quickstart: Run loopd against an LND node holding both channel and on-chain balance; loop out / loop in rebalance atomically (a fee to the Loop server applies).
- Maintainer: Lightning Labs
- Site: https://lightning.engineering/loop/
- Docs/API: https://lightning.engineering/loop/
- Repo: https://github.com/lightninglabs/loop
- Full card (verified detail, gotchas): https://bitcoineconomy.ai/tools/loop
- Provenance: curated (last verified 2026-07-19)

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Part of [The Marketplace directory](https://marketplace.bitcoineconomy.ai/) · registry JSON: https://marketplace.bitcoineconomy.ai/directory.json · full thesis: https://bitcoineconomy.ai/case