Browserbase runs headless browsers in the cloud so an AI agent, or the team building one, never has to host that infrastructure itself.
What it is
A customer requests a browser session over a REST API instead of launching Chromium locally. Browserbase hands back a live session with full control over state, timeouts, keep-alive behavior, and uploads, plus session recordings and a live-view UI for debugging what the agent actually did. Its Stealth Mode runs on a custom Chromium build tuned with real browser fingerprints rather than a stock headless binary. The company raised a $40M Series B in June 2025 and reported processing 50 million sessions across more than 1,000 customers that year, which puts it among the largest hosted browser-infrastructure providers agent builders reach for by default.
How it gets used to scrape
Teams point agent frameworks at Browserbase instead of running their own browser pool, mainly to get proxy rotation, CAPTCHA solving, and stealth tuning without building that stack themselves. That covers a wide range of traffic: form automation, data extraction from sites with no API, and general "let an agent use the web" workloads that need a lot of concurrent sessions.
Why it's hard to catch with old checks
Browserbase's Stealth Mode is built specifically to defeat page-load fingerprint checks: it starts from real browser fingerprints rather than patching a headless one after the fact. A detector that only checks navigator.webdriver or the HeadlessChrome user-agent string was never going to catch this. What still separates a Browserbase session from a person is the same thing that separates any hosted browser fleet from one: connection-level signals from the infrastructure it runs on, and behavioral patterns in how the agent uses the page once it's rendered.
Centinel detects it
In our September 2026 benchmark, Centinel identified every session run through Browserbase, Stealth Mode included. Centinel scores request, browser, and connection signals together rather than trusting any one fingerprint check in isolation, which is what a stealth-tuned fingerprint alone can't get around.
Key takeaways
- Browserbase is hosted browser infrastructure for agents, with its own Stealth Mode built on custom Chromium and real fingerprints.
- It's become a default choice for teams that don't want to run their own headless browser fleet, proxies, or CAPTCHA solving.
- Session-level and connection-level signals catch it even when the fingerprint checks its Stealth Mode targets don't.