diff --git a/packages/api-mux/README.md b/packages/api-mux/README.md
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+# `@lowerdeck/api-mux`
+
+Route multiplexer for API endpoints. Dispatches requests to different services based on domain, path, and HTTP method with support for fallback handlers.
+
+## Installation
+
+```bash
+npm install @lowerdeck/api-mux
+yarn add @lowerdeck/api-mux
+bun add @lowerdeck/api-mux
+pnpm add @lowerdeck/api-mux
+```
+
+## Usage
+
+```typescript
+import { apiMux } from '@lowerdeck/api-mux';
+
+// Define your services
+const mux = apiMux([
+  {
+    domains: ['api.example.com'],
+    methods: ['GET', 'POST'],
+    endpoint: {
+      path: '/users',
+      fetch: async (req) => {
+        return new Response('Users API');
+      }
+    }
+  },
+  {
+    methods: ['POST'],
+    endpoint: {
+      path: '/webhooks',
+      exact: true, // Only match exact path
+      fetch: async (req) => {
+        return new Response('Webhook handler');
+      }
+    }
+  }
+], async (req, server) => {
+  // Fallback handler for unmatched routes
+  return new Response('Not found', { status: 404 });
+});
+
+// Use with your HTTP server
+const server = Bun.serve({
+  fetch: mux
+});
+```
+
+## License
+
+This project is licensed under the Apache License 2.0.
+
+<div align="center">
+  <sub>Built with ❤️ by <a href="https://metorial.com">Metorial</a></sub>
+</div>
diff --git a/packages/api-mux/package.json b/packages/api-mux/package.json
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+++ b/packages/api-mux/package.json
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+{
+  "name": "@lowerdeck/api-mux",
+  "version": "1.0.0",
+  "publishConfig": {
+    "access": "public"
+  },
+  "author": "Tobias Herber",
+  "license": "Apache 2",
+  "type": "module",
+  "source": "src/index.ts",
+  "exports": {
+    "types": "./dist/index.d.ts",
+    "require": "./dist/index.cjs",
+    "import": "./dist/index.module.js",
+    "default": "./dist/index.module.js"
+  },
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.module.js",
+  "types": "dist/index.d.ts",
+  "unpkg": "./dist/index.umd.js",
+  "scripts": {
+    "test": "vitest run --passWithNoTests",
+    "lint": "prettier src/**/*.ts --check",
+    "build": "microbundle"
+  },
+  "devDependencies": {
+    "microbundle": "^0.15.1",
+    "@lowerdeck/tsconfig": "^1.0.0",
+    "typescript": "^5.9.3",
+    "vitest": "^3.2.4"
+  },
+  "dependencies": {
+    "@lowerdeck/error": "^1.0.5"
+  }
+}
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diff --git a/packages/api-mux/src/index.ts b/packages/api-mux/src/index.ts
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--- /dev/null
+++ b/packages/api-mux/src/index.ts
@@ -0,0 +1 @@
+export * from './mux';
diff --git a/packages/api-mux/src/mux.ts b/packages/api-mux/src/mux.ts
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+++ b/packages/api-mux/src/mux.ts
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+import { notFoundError } from '@lowerdeck/error';
+
+export let apiMux = (
+  services: {
+    domains?: string[];
+    methods?: string[];
+    endpoint: { path: string | string[]; fetch: (req: any) => Promise<any>; exact?: boolean };
+  }[],
+  fallback?: (req: any, server: any) => Promise<any>
+) => {
+  let servicesWithRegex = services.flatMap(({ domains, endpoint, methods }) =>
+    (Array.isArray(endpoint.path) ? endpoint.path : [endpoint.path]).map(path => {
+      return {
+        path,
+        domains,
+        endpoint,
+        exact: endpoint.exact,
+        methods: methods?.map(m => m.toUpperCase())
+      };
+    })
+  );
+
+  return (req: Request, server: any) => {
+    let url = new URL(req.url);
+    let host = (req.headers.get('x-host') ?? req.headers.get('host') ?? url.hostname).split(
+      ':'
+    )[0];
+    url.host = host;
+
+    if (url.pathname == '/ping') {
+      return new Response('OK') as any;
+    }
+
+    for (let { domains, endpoint, path, methods, exact } of servicesWithRegex) {
+      if (domains && !domains.includes(host)) continue;
+
+      if (
+        (url.pathname == path || (!exact && url.pathname.startsWith(`${path}/`))) &&
+        (!methods || methods.includes(req.method))
+      ) {
+        return endpoint.fetch(req);
+      }
+    }
+
+    if (fallback) return fallback(req, server);
+
+    return new Response(JSON.stringify(notFoundError('route').toResponse()), {
+      status: 404,
+      headers: {
+        'Content-Type': 'application/json'
+      }
+    }) as any;
+  };
+};
diff --git a/packages/api-mux/tsconfig.json b/packages/api-mux/tsconfig.json
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+++ b/packages/api-mux/tsconfig.json
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+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "extends": "@lowerdeck/tsconfig/base.json",
+  "exclude": [
+    "dist"
+  ],
+  "include": [
+    "src"
+  ],
+  "compilerOptions": {
+    "outDir": "dist"
+  }
+}
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diff --git a/packages/api-mux/tsup.config.js b/packages/api-mux/tsup.config.js
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+++ b/packages/api-mux/tsup.config.js
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+import { defineConfig } from 'tsup';
+
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['esm', 'cjs'],
+  splitting: false,
+  sourcemap: true,
+  clean: true,
+  bundle: true,
+  dts: true
+});