ChatGPT guide

See a company's tech stack with ChatGPT

Find what a website runs on, grouped by type, with live and no-longer-detected counts.

1. Connect looot to ChatGPT

Open ChatGPT Plugins at chatgpt.com/plugins.
Select the plus button, then "Add custom MCP server".
Enter a name (looot) and a short description, for example: live data APIs, paid per call.
Under Connection, choose Public endpoint and paste https://api.looot.ai/mcp, including the /mcp path.
Configure authentication, read the risk warning and select "I understand and want to continue".
Select "Create as a plugin", review the tools ChatGPT found on the server, then install the plugin.
looot's sign-in page opens when ChatGPT first needs your account: sign in and allow access. Runs are paid from your prepaid looot balance.

OpenAI's guide does not say which ChatGPT plans can add a custom MCP server. It says account and workspace policies apply to adding and using custom MCP servers.

Source, read 2026-11-10: OpenAI developer docs: Connect and test your plugin

2. Ask ChatGPT

Start a new conversation, type @ in the prompt box and select the looot plugin. Then paste the prompt.

Prompt

Use looot to get the technologies used by [domain] with the job company.technographics, fallback on. Group them by type (hosting, framework, analytics, payments) and tell me which groups changed the most over time.

3. Jobs it calls and what they cost

company.technographics
1 call, from free (BuiltWith, the cheapest of 5 providers)
Compare providers About the cheapest provider

One use costs from free at today's cheapest providers. A provider that misses can fall back to the next one, which can cost more; looot charges only the calls that ran, from your prepaid balance.

Providers in the real run below:BuiltWith

4. A real run

We ran this task through the looot MCP on 2026-11-10. Asked: vercel.com. Total charged: $0.

29 technology groups found for vercel.com.
Live today: framework 20, hosting 9, javascript 8, ssl 4, mobile 4, analytics 3, feeds 2, CDN 1.
Analytics shows 31 tools no longer detected against 3 live, the biggest change of any group.

company.technographics on builtwith-free1-api-json (BuiltWith): answered, charged $0. Run id run_e7131f56ecce4f4fa068a9367e75a907.

Good to know

The free BuiltWith endpoint that answered returns counts per group and category, not tool names. For named tools, ask for a paid endpoint of the same job.

The same task in Claude The prompt on its own All ChatGPT guides

Give your agent every data provider, one key.

Start your workspace, top up, and paste one prompt into the agent you already use.

Start your workspace See what agents can do