Byoky

The MetaMask for API keys.
Keep every AI API key in one wallet. Apps connect to the wallet. Your keys never leave Byoky.

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What is Byoky?

Byoky (Bring Your Own Key) is a wallet for your AI credentials: a browser extension plus iOS and Android apps. You add your API keys and setup tokens once, and they're encrypted on your device. Apps connect to the wallet the way dapps connect to MetaMask. They ask for access, you approve, and the wallet makes their LLM calls for them. The app never sees the key.

• One wallet, every provider. Anthropic, OpenAI, Gemini, Mistral and nine more, plus custom endpoints. Add a key once and use it in every Byoky-enabled app.
• Apps connect instead of copying keys. No more pasting sk-... into a settings page. Approve an app, see every request it makes, set spending caps, revoke it with one click.
• No servers. No accounts, no cloud sync, no relay. Byoky doesn't run anything that sits between you and your provider. The wallet talks only to the AI providers you add.
• Groups. Bucket connected apps by purpose ("Personal", "Work"), pin each group to a credential, then drag apps between groups to switch which key they use. Live sessions reroute without code changes.
• Cross-provider routing. Drag an app from a Claude group into a GPT group and the wallet translates on the fly: Anthropic ↔ OpenAI ↔ Gemini ↔ Cohere request bodies, response bodies and SSE streams.
• Fully open source. Every component, including the mobile apps, is in this repo under MIT.

How it works

1. Install the Byoky wallet → set a master password
2. Add your API keys or a Claude setup token → encrypted on this device
3. Open any Byoky-enabled app → approve access → the wallet proxies its calls

Install

Platform	Version	Link
Chrome		Chrome Web Store
Firefox		Mozilla Add-ons
iOS	—	App Store (wallet + Safari extension)
Android	—	Google Play (wallet + in-wallet browser)
Safari (macOS)	Coming soon	—
npm		@byoky/sdk · @byoky/core · @byoky/bridge

Where apps can connect

Each wallet serves the apps on its own device:

Quick Start

For Developers

Scaffold a new app:

npx create-byoky-app

Or add to an existing project:

npm install @byoky/sdk

import Anthropic from '@anthropic-ai/sdk';
import { Byoky } from '@byoky/sdk';

const byoky = new Byoky();
const session = await byoky.connect({
  providers: [{ id: 'anthropic', required: true }],
  modal: true,
});

// Use the native Anthropic SDK — just swap in Byoky's fetch
const client = new Anthropic({
  apiKey: session.sessionKey,
  fetch: session.createFetch('anthropic'),
});

// Everything works exactly like normal, including streaming
const message = await client.messages.create({
  model: 'claude-sonnet-4-20250514',
  max_tokens: 1024,
  messages: [{ role: 'user', content: 'Hello!' }],
});

Two lines changed. Full API compatibility: streaming, file uploads and vision all work. session.sessionKey is a per-app session token, not the user's key. Sessions auto-reconnect if the extension restarts.

Backend Relay

Need LLM calls from your server? The user's browser relays them through the wallet over a WebSocket you host. Your backend never sees the API key, and no Byoky server is involved.

Your backend ←WebSocket (your server)→ User's browser ←→ Byoky extension → LLM API

// Frontend — open a relay so the backend can make LLM calls
const session = await new Byoky().connect({ providers: [{ id: 'anthropic' }], modal: true });
const relay = session.createRelay('wss://your-app.com/ws/relay');

// Backend (Node.js)
import { ByokyServer } from '@byoky/sdk/server';

const byoky = new ByokyServer();
wss.on('connection', async (ws) => {
  const client = await byoky.handleConnection(ws);
  const fetch = client.createFetch('anthropic');
  const res = await fetch('https://api.anthropic.com/v1/messages', {
    method: 'POST',
    headers: { 'content-type': 'application/json', 'anthropic-version': '2023-06-01' },
    body: JSON.stringify({
      model: 'claude-sonnet-4-20250514',
      max_tokens: 1024,
      messages: [{ role: 'user', content: 'Hello!' }],
    }),
  });
});

CLI / Local Apps (Bridge)

CLI tools and desktop apps route API calls through the bridge, a localhost HTTP proxy that hands requests to the extension over native messaging. Keys never leave the extension.

CLI app → HTTP → Bridge (localhost) → Native Messaging → Extension → LLM API

npm install -g @byoky/bridge
byoky-bridge install   # register native messaging host
byoky-bridge connect   # approve a session, start the proxy on 127.0.0.1:19280

# Clients send the bridge token as their API key:
export ANTHROPIC_BASE_URL=http://127.0.0.1:19280/anthropic
export ANTHROPIC_API_KEY=$(byoky-bridge token)

OpenClaw Integration

Use your Byoky wallet as the key provider for OpenClaw. The plugin connects through the bridge, so your keys stay in the extension even when the agent runs in your terminal. See the OpenClaw plugin for setup.

OpenClaw → HTTP → Bridge (localhost) → Native Messaging → Extension → LLM API

Setup tokens work too. OpenClaw (and other third-party agent frameworks) can use a Claude.ai setup token as the Anthropic credential, not just an sk-ant-api03-... API key. The bridge rewrites tool names and moves the framework's system prompt out of the system field on the way out, then reverses the tool names on the streaming response. Anthropic's first-party detection accepts the request and the agent behaves as before.

Security

Supported Providers

Setup Token: Use your Claude Pro/Max subscription via claude setup-token. API keys use pay-per-use billing from the provider console.

Architecture

Byoky uses a proxy model: keys never leave the wallet, and every integration path ends at a wallet on the user's own device.

Browser apps   → SDK (createFetch) → Content Script → Extension → LLM API
Safari (iOS)   → SDK (createFetch) → Content Script → Safari Extension → LLM API
In-wallet apps → SDK (createFetch) → Native bridge → iOS / Android app → LLM API
Backend apps   → SDK/server (your WebSocket) → User's browser → Extension → LLM API
CLI/desktop    → HTTP → Bridge (localhost) → Native Messaging → Extension → LLM API

The SDK provides createFetch(), a drop-in fetch replacement that routes through the wallet. It works with any provider's native SDK.

Project Structure

byoky/
├── packages/
│   ├── core/             # Shared types, crypto, protocol, provider registry, translation
│   ├── sdk/              # @byoky/sdk (+ @byoky/sdk/server for backend relay)
│   ├── extension/        # Browser extension (Chrome, Firefox, Safari) — WXT
│   ├── bridge/           # @byoky/bridge — localhost proxy + native messaging for CLI/desktop apps
│   ├── ios/              # iOS app (wallet + Safari extension + in-wallet browser)
│   ├── android/          # Android app (wallet + in-wallet browser)
│   ├── openclaw-plugin/  # OpenClaw provider plugin (via the bridge)
│   ├── create-byoky-app/ # CLI scaffolder — npx create-byoky-app
│   └── web/              # byoky.com — landing page, docs, demo, chat
├── e2e/                  # Playwright tests against the real extension
└── marketing/            # Screenshot + composite + video pipeline (gitignored outputs)

Development

pnpm install              # Install dependencies
pnpm dev                  # Start extension in dev mode (Chrome)
pnpm build                # Build all packages
pnpm typecheck            # Type check everything
pnpm test                 # Unit tests

Browser-specific builds:

pnpm --filter @byoky/extension dev:firefox
pnpm --filter @byoky/extension build:all     # Chrome + Firefox + Safari

Load in Chrome:

1. pnpm dev
2. Navigate to chrome://extensions
3. Enable "Developer mode"
4. Click "Load unpacked" → select packages/extension/.output/chrome-mv3

Mobile: open packages/ios/Byoky.xcodeproj in Xcode, or packages/android in Android Studio. Both embed the core translation bundle. Run ./scripts/sync-mobile-bundle.sh after changing packages/core/src/translate/.

Marketing pipeline

marketing/ holds a self-contained pipeline that generates store screenshots, composites and narrated walkthrough videos. It reuses the e2e Playwright fixtures and the iOS/Android simulators.

pnpm marketing:install                  # one-time: Sharp, Playwright, Chromium
pnpm marketing:desktop                  # Chrome + web + composites + narration + video
pnpm marketing:capture:ios              # requires booted iOS simulator
pnpm marketing:capture:android          # requires adb-visible emulator
pnpm marketing:all                      # end-to-end

Tech Stack

Built with Byoky

Star History

Contributing

Contributions are welcome! See CONTRIBUTING.md for guidelines.

License

MIT. Everything that makes up Byoky, from the wallets and SDK to the bridge and the website, lives in this repository. There are no closed components and no hosted services.