Lightning Labs’ new toolkit adds a self-custodial bitcoin wallet to any application with a few API calls: no node to run, no channels to manage, no liquidity to source.
On 21 July, Lightning Labs announced the alpha launch of Wavelength, described as “bitcoin made easy for agents and humans”: a toolkit for adding self-custodial bitcoin payments – and later stablecoin support – to any application with a few API calls. The service is open to everyone on signet and testnet, while mainnet access is by invitation.
The promise is summarised in the announcement post signed by Michael Levin: “No node to run, no channels to manage, no liquidity to source.” The commands fit on one hand (create, unlock, balance, recv, send, activity, exit), every inbound or outbound payment is a standard BOLT 11 invoice, and deposits and withdrawals use ordinary bitcoin addresses. Under the hood, settlement occurs on a layer similar to Ark, which aggregates off-chain transfers while keeping users in control of their funds. The code is available on GitHub.
What distinguishes Wavelength from a custodial payment processor is the exit command: the client keeps the balance up to date to allow unilateral exit, and the user can move funds back on-chain at any time, without the cooperation or permission of anyone. During the closed alpha, Lightning transactions carry a service fee of 1 basis point (0.01%), on top of standard network routing fees and on-chain costs when funds touch the blockchain.
The other half of the product targets agents. The same API is exposed to AI agents as typed tool calls via the Model Context Protocol, with one deliberate constraint: wallet creation and unlocking remain on the command line, so seeds and passwords never travel over the model channel. With L402, any API can request a few satoshis per call instead of a monthly subscription: the agent receives a Lightning invoice, pays it, and gains access – no registration or prior relationship required. “Bitcoin doesn’t care if you’re a human or an agent, and neither does Wavelength,” Levin writes. The direction is not new for Lightning Labs, which in February released an open-source toolkit for Lightning payments by AI agents, and aligns with findings already measured by the Bitcoin Policy Institute: across 36 artificial intelligence models, bitcoin was the most chosen monetary instrument with 48.3% of preferences, ahead of fiat currency.
