Billium SDKs

Official client libraries for Billium — non-custodial crypto payments, invoices, and webhooks.

Packages

Package	Version	Description
@billium/node		Node.js SDK — invoices, webhook signature verification, webhook management
@billium/mcp		MCP server — manage invoices and webhooks from Claude, Cursor, and any MCP host

Additional language SDKs will live as siblings under packages/ as they ship.

Quick start

npm install @billium/node

import { Billium } from '@billium/node';

const billium = new Billium({
  apiKey: process.env.BILLIUM_API_KEY,
  merchantId: process.env.BILLIUM_MERCHANT_ID,
  webhookSecret: process.env.BILLIUM_WEBHOOK_SECRET,
});

const invoice = await billium.invoices.create(
  { name: 'Order #1234', rawAmount: 99.99 },
  { idempotencyKey: crypto.randomUUID() },
);

See packages/node/README.md for the full Node.js SDK reference.

Repository layout

.
├── packages/
│   ├── node/              # @billium/node — TypeScript Node.js SDK
│   │   ├── src/           # Source
│   │   ├── tests/         # Vitest test suite
│   │   ├── README.md      # Public-facing docs (rendered on npmjs.com)
│   │   └── CHANGELOG.md   # Per-release notes
│   └── mcp/               # @billium/mcp — Model Context Protocol server
│       ├── src/           # Server + tool definitions
│       ├── tests/         # Vitest in-memory round-trip suite
│       └── README.md      # Host setup (Claude Code, Cursor, …)
└── .github/
    ├── workflows/         # CI + release automation
    ├── ISSUE_TEMPLATE/    # Bug + feature request forms
    └── CODEOWNERS         # Review requirements

Development

This is an npm workspace. Run scripts from the repository root:

npm install        # installs all workspace packages
npm run lint       # typechecks every package (src + tests)
npm test           # runs every package's test suite
npm run build      # builds every package

To work on a specific package, you can also cd packages/node && npm <script>.

Releasing

Releases are published to npm by GitHub Actions when a v*.*.* tag is pushed:

1. Bump packages/node/package.json#version and packages/node/src/version.ts#SDK_VERSION to the new version (CI verifies they match).
2. Add a section to packages/node/CHANGELOG.md describing the changes.
3. Commit the bump on main.
4. Tag and push: git tag v1.0.1 && git push origin v1.0.1.
5. The release workflow runs lint, test, build, then npm publish with provenance.

License

MIT