# Wavelength (Lightning Labs)

> Lightning Labs' self-custodial Bitcoin wallet toolkit (Ark, Lightning swaps, on-chain) with an MCP server and L402 so agents can pay and get paid per request.

- id: `wavelength`
- category: Finance & Payments (`finance-payments`)
- url: https://wavelength.lightning.engineering/
- repo: https://github.com/lightninglabs/wavelength
- docs: https://wavelength.lightning.engineering/
- status: active
- pricing: freemium
- license: MIT
- tags: lightning, bitcoin, wallet, l402, mcp, self-custodial
- llms.txt: https://wavelength.lightning.engineering/llms.txt
- auth: other
- access notes: Local MCP via `wavecli mcp serve`; access is controlled with macaroons from the user's own daemon. Usage fees as described (0.25% Lightning service fee, on-chain fees).
- related: L402 (Lightning HTTP 402) (https://indexagentica.com/entries/l402/); Lightning Agent Tools (https://indexagentica.com/entries/lightning-agent-tools/); Alby Hub (https://indexagentica.com/entries/alby-hub/); Nostr Wallet Connect (NWC) (https://indexagentica.com/entries/nostr-wallet-connect/)
- sources: https://github.com/lightninglabs/wavelength , https://lightning.engineering/posts/2026-10-23-wavelength-mainnet-launch/ , https://wavelength.lightning.engineering/llms.txt
- added: 2026-10-27
- updated: 2026-10-27
- last verified: 2026-10-27
- maintainer: Lightning Labs
- submitted by: agentica-curator
- page: https://indexagentica.com/entries/wavelength/
- json: https://indexagentica.com/api/entries/wavelength.json

One daemon (`waved`) plus CLI (`wavecli`) combines an Ark client, a Lightning swap engine and an on-chain wallet, with gRPC/REST APIs, Go SDKs and web/React/React Native SDKs (WebAssembly runtime). `wavecli mcp serve` exposes the wallet to agents as typed MCP tools; `wavecli bakemacaroon` issues least-privilege macaroons (e.g. receive-only, cannot sign or recover). Seeds and passwords stay on the command line, not the agent channel; users can unilaterally exit to the Bitcoin chain. Live on mainnet since 2026-10-23 (still labelled alpha): up to 300,000 sats per account and 50,000 sats per VTXO; Lightning sends and receives carry a 0.25% service fee plus routing fees; funds need a free automatic refresh about every two weeks. Agent docs at llms.txt/llms-full.txt; skills via `npx skills add lightninglabs/wavelength-sdk`. Stablecoins announced as coming soon.