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BuiltWith for AI agents

BuiltWith profiles the technology behind any website, showing what analytics, hosting, and content tools a domain runs, for research on competitors or prospects. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect BuiltWithSee the 11 actions ↓
AnalyticsAPI keyMCP + RESTbuiltwith.com
AUDIT LOG · BUILTWITHPOLICY: acme-support
09:41:09 · claude · u_8f2write
builtwith.create_domain_list_file
Create Domain List File✓ approved · approved by user
EVERY BUILTWITH CALL, ON THE RECORD
01 · USE CASES

What agents do in BuiltWith.

01

Look up a domain's tech stack

Look up which analytics, hosting, and CMS tools a competitor's domain is running before a sales call.

02

Check a site's social tools

Check which social platforms and tracking pixels are installed on a prospect's website before outreach.

03

Build a filtered list of domains

Create a domain list filtered by a specific technology, such as sites still running an outdated CMS.

02 · ACTIONS

11 BuiltWith actions, graded by risk.

Every BuiltWith action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

0

Look things up. Allowed by default.

  • No read actions.

write

11

Create and change things. Allow, or ask the user first.

  • builtwith.create_domain_list_file
    Create Domain List File
  • builtwith.mcp_api_lookup
    MCP API Lookup (Deprecated)
  • builtwith.datasets_lookup
    Datasets Lookup
  • builtwith.free_api_lookup
    Free API Lookup
  • builtwith.domain_api_lookup
    Domain API Lookup
  • builtwith.social_api_lookup
    Social API Lookup
  • builtwith.lists_api_get_list
    Lists API Get List
  • builtwith.product_api_lookup
    Product API Lookup
  • builtwith.financial_api_lookup
    Financial API Lookup
  • builtwith.redirects_api_lookup
    Redirects API Lookup
  • builtwith.recommendations_api_lookup
    Recommendations API Lookup

destructive

0

Delete, cancel or archive. Ask first, or deny outright.

  • No destructive actions.
03 · HOW IT WORKS

BuiltWith in three steps.

  1. 01Your users connect BuiltWithThey add their BuiltWith api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, and writes like “create Domain List File” can wait for the user to approve.
  3. 03Any agent can actYour agent calls BuiltWith through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
POLICY.TS
await arc0.policies.set('builtwith', {
  read: 'allow',
  write: 'ask',        // create_domain_list_file
  destructive: 'deny',  
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2
04 · AUTH AND DATA

How BuiltWith connects.

Users add their BuiltWith api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same BuiltWith connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH
API key
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use BuiltWith from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More analytics apps.

Gong58 actionsSerpApi59 actionsPeople Data Labs27 actionsPostHog507 actions21risk8 actionsAkta19 actionsAlpha Vantage56 actionsAmplitude54 actions
ALL ANALYTICS APPS →
07 · FAQ

BuiltWith and Arc0, answered.

Q01

Can I use BuiltWith with Claude, ChatGPT or Cursor?

Yes. Connect BuiltWith to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the BuiltWith actions you allow.

Q02

How do users connect BuiltWith?

Users add their BuiltWith api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which BuiltWith actions can my agent take?

11 in total: 0 read, 11 write and 0 destructive, such as “create Domain List File”. Your policies decide which of them each agent may call.

Q04

Can I make my agent read-only in BuiltWith?

Yes. Allow read actions and deny writes in the BuiltWith policy. Your agent can still look things up, and any write it attempts is blocked and logged.

Q05

Can my own backend call BuiltWith too?

Yes. The same BuiltWith connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug BuiltWith into your agent.

Your users connect BuiltWith once, under your brand. Your agent gets 11 actions behind your policies, with every call on the record.

Connect BuiltWithBrowse all apps →

Free to build · MCP + REST · Audit log on every plan