Quick Start

Run your first cloud browser in four steps

This guide walks through the shortest path from console setup to Python automation: create an API key, create a session, open the browser View, and connect the SDK.

Start the guide Open console

API Key

Create credentials for platform and SDK calls.

Session

Launch one cloud browser instance on demand.

View & Navigate

Open the remote screen and verify page access.

Python SDK

Move the same workflow into agent code.

Console Flow

Verify the browser path manually first

Use the console to confirm credentials, session creation, and remote access before putting the flow into code.

Create an API key

Go to Settings / API Keys

Create and copy the new key once

Save the project ID shown on the same page

API Keys

Project credentials

Ready

API Key

sk_live_••••••••••••9f2a

Project ID

project_...

Status

Active

Create a session

Open Sessions, click Create, choose the browser mode, and wait for the session to enter the running state.

A session is one cloud browser instance

The platform returns View and CDP connection entries

Stop the session when the task is finished

Use the session to navigate

Open View from the running session. You can type a URL, observe the page, and take over manually when needed.

View displays the remote browser screen

Use the address bar to verify navigation

Copy the CDP endpoint when automation code needs it

Python SDK

Connect the same session flow from code

After the console flow is verified, the agent can create and control cloud browsers directly through the SDK.

Prepare credentials

Use environment variables so API keys do not appear in source code.

export LEXMOUNT_API_KEY="sk_..."
export LEXMOUNT_PROJECT_ID="project_..."

The SDK reads the two environment variables above by default.

connect_url is compatible with Playwright connect_over_cdp.

Use context manager or close the session after the task completes.

Install dependencies

shell

pip install lexmount playwright
playwright install chromium

Create a browser and navigate

python

from lexmount import Lexmount
from playwright.sync_api import sync_playwright

client = Lexmount()

with client.sessions.create(browser_mode="normal") as session:
    print("session:", session.id)
    print("view:", session.inspect_url)

    with sync_playwright() as p:
        browser = p.chromium.connect_over_cdp(session.connect_url)
        context = browser.contexts[0] if browser.contexts else browser.new_context()
        page = context.pages[0] if context.pages else context.new_page()

        page.goto("https://example.com", wait_until="domcontentloaded")
        print("title:", page.title())

        browser.close()

Ready to connect an agent to cloud browsers?

Start from the console, confirm one session works, then move the workflow into SDK code.

Create API key Read docs

from lexmount import Lexmount from playwright.sync_api import sync_playwright client = Lexmount() with client.sessions.create(browser_mode="normal") as session: print("session:", session.id) print("view:", session.inspect_url) with sync_playwright() as p: browser = p.chromium.connect_over_cdp(session.connect_url) context = browser.contexts[0] if browser.contexts else browser.new_context() page = context.pages[0] if context.pages else context.new_page() page.goto("https://example.com", wait_until="domcontentloaded") print("title:", page.title()) browser.close()