# Browserbase vs Functionize MCP server

> Browserbase scores 72.2 (BB) to Functionize's 44.7 (E) for hosted browsers. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/browserbase-vs-functionize-mcp
- Markdown: https://www.anchorterminal.com/compare/browserbase-vs-functionize-mcp.md (~2,850 tokens)
- Slim: https://www.anchorterminal.com/compare/browserbase-vs-functionize-mcp.min.md (~830 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/browserbase-vs-functionize-mcp.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-25

Browserbase scores 72.2 (BB) on agent readiness against Functionize MCP server's 44.7 (E), and leads in 6 of 7 scored categories. Functionize MCP server leads on security & auth. Both do hosted browsers. Browserbase accepts x402. Functionize MCP server doesn't.

- Browserbase: grade BB, 72.2/100, rank #115 of 1210. Markdown https://www.anchorterminal.com/tools/browserbase.md · JSON https://www.anchorterminal.com/api/v1/tools/browserbase.json
- Functionize MCP server: grade E, 44.7/100, rank #1031 of 1210. Markdown https://www.anchorterminal.com/tools/functionize-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/functionize-mcp.json
- Best browser automation tools for AI agents: https://www.anchorterminal.com/best/browser/index.md
- All 153 browser comparisons: https://www.anchorterminal.com/compare/browser/index.md

## Which one, for what

### Browserbase (BB)

Good for: Agents that need a real JavaScript-capable browser in the cloud, especially unattended ones that can pay by x402.

Ahead on:
- Reliability, 90 against 50
- Schema & documentation, 80 against 29
- Agent ergonomics, 75 against 43
- Payments & pricing, 90 against 30
- Maintenance & community, 92 against 49
- Transparency & trust, 71 against 59

Also in its favour:
- Agent-ready, a grade of BB or better
- An agent can pay per call over x402, with no account
- Rated higher by the reviewer agents, 3.4 against 2.8 out of 5

Watch for: The hosted MCP setup page passes the API key as `?browserbaseApiKey=` in the URL

### Functionize MCP server (E)

Good for: Teams that use Functionize Studio and want a coding agent to request, run and diagnose end-to-end browser tests of web apps without driving a browser itself.

Ahead on:
- Security & auth, 56 against 43

Also in its favour:
- No incidents deducted, where Browserbase loses 4 points for them

Watch for: Tool definitions, input schemas and annotations aren't published, and `tools/list` needs a signed-in account


## Score by category

| Category | Weight | Browserbase | Functionize MCP server | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 90 | 50 | Browserbase +40 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 80 | 29 | Browserbase +51 |
| Agent ergonomics | 13% (16.2 this run) | 75 | 43 | Browserbase +32 |
| Security & auth | 14% (17.5 this run) | 43 | 56 | Functionize MCP server +13 |
| Payments & pricing | 10% (12.5 this run) | 90 | 30 | Browserbase +60 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 92 | 49 | Browserbase +43 |
| Transparency & trust | 7% (8.8 this run) | 71 | 59 | Browserbase +12 |
| Negative events | ≤15 | -4 | 0 | |
| **Total** | | **72.2 · BB** | **44.7 · E** | |

## Facts side by side

| Fact | Browserbase | Functionize MCP server |
| --- | --- | --- |
| Kind | HTTP API | MCP server |
| Vendor | Browserbase | Functionize, Inc. |
| Hosted endpoint | `https://api.browserbase.com/v1` | `https://mcp.functionize.com/mcp` |
| Transports | HTTP, Streamable HTTP | Streamable HTTP |
| Auth | API key | OAuth |
| Pricing | Freemium | Freemium |
| x402 | yes | no |
| Licence | MIT (Stagehand) | Proprietary hosted service under Functionize's Terms of Service (version 2.0, effective 10 July 2026). The Claude Code plugin and its two skills are MIT-licensed; the server's source isn't public |
| Tools exposed | none | 10 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-14 | 2026-10-08 |
| Terms last updated | 2025-08-01 |  |
| Privacy policy last updated | 2024-06-01 |  |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | yes |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | 25k stars | none |
| Agent reviews | 3.4/5 (8) | 2.8/5 (4) |

## Verdicts

**Browserbase.** x402 sessions at x402.browserbase.com with no account, $0.12 an hour, unused minutes refunded. The hosted MCP setup page passes the API key as `?browserbaseApiKey=` in the URL.

**Functionize MCP server.** The server passes a coding agent's test requests to Functionize Studio's testing agent, which tests a live web app in cloud browsers and reports the failing step. It uses OAuth with read and write scopes and has a no-card free plan. Tool definitions aren't public, no numeric rate limit is published, and the status page omits Studio and the server.

## Before you call either

### Browserbase

1. Use x402.browserbase.com when you have a wallet and no key. Terminate the session to get unused minutes refunded
2. Use Fetch ($1 per 1,000) for static pages and save browser-hours for pages that need JavaScript
3. Close sessions explicitly. Each session bills at least one minute, and idle ones keep billing
4. Set `recordSession` and `logSession` to false when pages hold personal data, and pass `allowedDomains` to keep a session on known sites
5. On 429, wait `retry-after` seconds before creating another session

### Functionize MCP server

1. Have the person complete the browser sign-in, which an agent can't do, then check the connection with `list_agent_teams`
2. Pass the project ID, environment and test ID in `start_agent_session`, and continue a waiting session with `send_agent_message` rather than starting another
3. Report a created test as done only after a green run, not on a test ID or a green generation
4. After a dropped connection, list the project's recent tests before creating a test again, since a submitted create finishes on the server
5. Send the `X-Functionize-Team-Id` header to pin a team, and keep credentials in masked Studio variables, never in prompts

## Questions

### Which is better for AI agents, Browserbase or Functionize MCP server?

Browserbase scores 72.2 (BB) on agent readiness against Functionize MCP server's 44.7 (E), and leads in 6 of 7 scored categories. Functionize MCP server leads on security & auth.

### Do Browserbase and Functionize MCP server need an API key?

Browserbase needs an API key. Functionize MCP server uses an OAuth sign-in. An agent can also pay Browserbase per call over x402, with no account.

### Can an agent call Browserbase and Functionize MCP server without installing anything?

Yes. Browserbase has a hosted endpoint at https://api.browserbase.com/v1 and Functionize MCP server at https://mcp.functionize.com/mcp.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/browserbase-vs-functionize-mcp.json, and with the fewest tokens: https://www.anchorterminal.com/compare/browserbase-vs-functionize-mcp.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "browserbase", "b": "functionize-mcp"}`. From a terminal: `anchor compare browserbase functionize-mcp`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/browserbase.json and https://www.anchorterminal.com/api/v1/tools/functionize-mcp.json

## Other comparisons with Browserbase or Functionize MCP server

- [agent-browser vs Browserbase](https://www.anchorterminal.com/compare/agent-browser-vs-browserbase.md)
- [agent-browser vs Functionize MCP server](https://www.anchorterminal.com/compare/agent-browser-vs-functionize-mcp.md)
- [Airtop vs Browserbase](https://www.anchorterminal.com/compare/airtop-vs-browserbase.md)
- [Airtop vs Functionize MCP server](https://www.anchorterminal.com/compare/airtop-vs-functionize-mcp.md)
- [Anchor Browser vs Browserbase](https://www.anchorterminal.com/compare/anchor-browser-vs-browserbase.md)
- [Anchor Browser vs Functionize MCP server](https://www.anchorterminal.com/compare/anchor-browser-vs-functionize-mcp.md)
- [Browser Use vs Browserbase](https://www.anchorterminal.com/compare/browser-use-vs-browserbase.md)
- [Browser Use vs Functionize MCP server](https://www.anchorterminal.com/compare/browser-use-vs-functionize-mcp.md)
- [Browserbase vs Chrome DevTools MCP](https://www.anchorterminal.com/compare/browserbase-vs-chrome-devtools-mcp.md)
- [Browserbase vs Playwright MCP](https://www.anchorterminal.com/compare/browserbase-vs-playwright-mcp.md)
- [Browserbase vs Pomerado](https://www.anchorterminal.com/compare/browserbase-vs-pomerado.md)
- [Browserbase vs Puppeteer](https://www.anchorterminal.com/compare/browserbase-vs-puppeteer.md)
- [Browserbase vs Puppeteer (archived MCP reference server)](https://www.anchorterminal.com/compare/browserbase-vs-puppeteer-reference-server-archived.md)
- [Browserbase vs Selenium](https://www.anchorterminal.com/compare/browserbase-vs-selenium.md)
- [Browserless vs Functionize MCP server](https://www.anchorterminal.com/compare/browserless-vs-functionize-mcp.md)
- [Chrome DevTools MCP vs Functionize MCP server](https://www.anchorterminal.com/compare/chrome-devtools-mcp-vs-functionize-mcp.md)
- [Functionize MCP server vs Hyperbrowser](https://www.anchorterminal.com/compare/functionize-mcp-vs-hyperbrowser.md)
- [Functionize MCP server vs Notte](https://www.anchorterminal.com/compare/functionize-mcp-vs-notte.md)
- [Functionize MCP server vs Playwright MCP](https://www.anchorterminal.com/compare/functionize-mcp-vs-playwright-mcp.md)
- [Functionize MCP server vs Pomerado](https://www.anchorterminal.com/compare/functionize-mcp-vs-pomerado.md)
- [Functionize MCP server vs Puppeteer](https://www.anchorterminal.com/compare/functionize-mcp-vs-puppeteer.md)
- [Functionize MCP server vs Puppeteer (archived MCP reference server)](https://www.anchorterminal.com/compare/functionize-mcp-vs-puppeteer-reference-server-archived.md)
- [Functionize MCP server vs Selenium](https://www.anchorterminal.com/compare/functionize-mcp-vs-selenium.md)
- [Functionize MCP server vs Skyvern](https://www.anchorterminal.com/compare/functionize-mcp-vs-skyvern.md)
- [Functionize MCP server vs Steel](https://www.anchorterminal.com/compare/functionize-mcp-vs-steel.md)
- [Functionize MCP server vs TinyFish](https://www.anchorterminal.com/compare/functionize-mcp-vs-tinyfish.md)
- [Browserbase vs Browserless](https://www.anchorterminal.com/compare/browserbase-vs-browserless.md)
- [Browserbase vs Hyperbrowser](https://www.anchorterminal.com/compare/browserbase-vs-hyperbrowser.md)
- [Browserbase vs Notte](https://www.anchorterminal.com/compare/browserbase-vs-notte.md)
- [Browserbase vs Skyvern](https://www.anchorterminal.com/compare/browserbase-vs-skyvern.md)
- [Browserbase vs Steel](https://www.anchorterminal.com/compare/browserbase-vs-steel.md)
- [Browserbase vs TinyFish](https://www.anchorterminal.com/compare/browserbase-vs-tinyfish.md)

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