Python SDK

The lexmount package creates remote browser sessions and exposes sessions, persistent contexts, extensions, downloads, CDP helpers, and region selection through a typed Python API.

Install

pip install --upgrade lexmount==0.7.0

Requirements:

• Python 3.8 or later
• Playwright is optional and only required for browser automation

Install Playwright for the examples in this guide:

pip install playwright python-dotenv
playwright install chromium

Current capabilities

• asynchronous session creation with activation polling;
• Chromium (normal) and Moli (light) browser types;
• automatic region catalog selection or an explicit region;
• View/inspect URL, CDP connection URL, and page-target discovery;
• persistent context create, list, get, fork, delete, and force release;
• extension upload, list, get, mount, and delete;
• custom or official proxy configuration;
• stored downloads and persistent replay controls;
• custom image and window-size session options;
• structured errors, configurable logs, raw CDP helpers, and opt-in quality reporting.
• Browser Agent: create saved Agents, run tasks, inspect results, and cancel Runs (SDK 0.7.0).

Configuration

export LEXMOUNT_API_KEY='<your-api-key>'
export LEXMOUNT_PROJECT_ID='<your-project-id>'
export LEXMOUNT_BASE_URL=https://api.lexmount.com

Constructor arguments override environment variables. LEXMOUNT_BASE_URL is optional and defaults to https://api.lexmount.com.

Package and examples

• Python SDK package (PyPI)
• Runnable Python quickstart examples

Next

• Quick Start: create Chromium and Moli sessions and connect with Playwright.

• Capabilities: current client, session, context, extension, download, and CDP APIs.

• Examples: choose a runnable script by task.

• SDK local proxy: reach internal sites through the SDK machine's network and DNS.