Tools · Agent-integration primitives

Money Dev Kit

A self-custodial Lightning payments SDK — add Bitcoin checkout to an app in minutes, and equip an agent with its own keys-and-accounts-free wallet via the agent-wallet CLI.

What it is

Money Dev Kit (MDK) is a self-custodial Lightning payments SDK — “global payments for any app in minutes.” It deploys a serverless LDK (Lightning Dev Kit) “mini node” on the developer’s own infrastructure, while MDK runs the LSP side (opening channels and managing inbound liquidity) so the builder never operates node infrastructure. The developer holds the keys via a seed (MDK_MNEMONIC); MDK never holds funds. It ships framework libraries (@moneydevkit/nextjs, @moneydevkit/replit) with drop-in checkout components and webhooks.

For agents specifically, MDK ships two directly drivable surfaces: an agent-wallet CLI (npx @moneydevkit/agent-wallet) — a standalone self-custodial Lightning wallet with no API keys and no accounts, JSON in and out, that an agent runs itself to hold and spend sats (BOLT11, BOLT12, LNURL, Lightning Address) — and a hosted MCP server (mcp.moneydevkit.com) an agent uses to scaffold and operate an MDK integration. The Unhuman storefronts are MDK’s own production deployment.

When to use it

• Equipping an agent with its own self-custodial Lightning wallet it controls (no account, no key handoff) via the agent-wallet CLI.
• Adding Bitcoin/Lightning checkout to an app or agent-facing service without running a node.
• Building an L402-gated, agent-payable endpoint of your own — the pattern behind Unhuman.

Dependencies

To build: a Next.js or Replit/Vite app, plus an MDK seed (MDK_MNEMONIC) — MDK runs the LSP and opens channels to your serverless node while you control the keys. To run the agent wallet: just Node (npx @moneydevkit/agent-wallet) — it auto-starts a local daemon, generates a mnemonic on init, and needs no account or API key. Bitcoin/Lightning is the only rail; there is no fiat path.

Quick start

Agent wallet: npx @moneydevkit/agent-wallet@latest init, then … receive 1000 (sats) or … send <destination> — output is JSON to stdout. App integration: install @moneydevkit/nextjs, set MDK_MNEMONIC, drop in the checkout component; the hosted MCP (claude mcp add moneydevkit --transport http https://mcp.moneydevkit.com/mcp/) can scaffold and configure it. Docs at docs.moneydevkit.com (machine index at /llms.txt); installable agent-skills (mdk-nextjs-checkout, mdk-l402-api, mdk-agent-wallet, …) via the Vercel Skills CLI.

Gotchas

• Public beta — 2% per-transaction fee during beta (no monthly fee, no contract). Price it in.
• License is mixed/partly unstated. @moneydevkit/agent-wallet is Apache-2.0 (confirmed); @moneydevkit/nextjs and @moneydevkit/replit carry no SPDX license field on npm — confirm before commercial use.
• Self-custody means key responsibility. The builder or agent holds the seed (MDK_MNEMONIC / MDK_WALLET_MNEMONIC); lose it, lose the funds. MDK staff “will never ask for your mnemonic.”
• The hosted MCP is build/ops tooling. mcp.moneydevkit.com helps an agent scaffold and operate an MDK app; its individual tool names aren’t published. The runtime agent wallet is the agent-wallet CLI.