ChatGPT guide

Build a B2B lead list with ChatGPT

Describe the companies you sell to in one sentence and get a list with websites, LinkedIn pages and size bands.

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 find companies that match this description: [industry, country, employee range]. Run the job company.search with fallback on and ask for up to 25 results. Return a table with name, website, city, size band and LinkedIn URL. Do not add companies the search did not return.

3. Jobs it calls and what they cost

company.search
1 call, from $0.00038 per result (Icypeas, the cheapest of 19 providers)
Compare providers About the cheapest provider

One use costs from $0.00038 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:Tomba

4. A real run

We ran this task through the looot MCP on 2026-11-10. Asked: B2B SaaS companies in France with 50 to 200 employees. Total charged: $0.0089.

8 companies came back. Tomba read the sentence as: country FR, size 51 to 250, industry Software Development, keyword b2b saas.
Examples: Welii (welii.io), Stonal (stonal.com), Fabriq (fabriq.tech), lempire (lempire.com), PLPSoft (plpsoft.com).
Each row has a website, a LinkedIn URL, the city and how many emails the provider knows at the company (1 to 7).
The size band 51 to 250 is wider than the 50 to 200 we asked for.

company.search on tomba-reveal-search (Tomba): answered, charged $0.0089. Run id run_07e81b417e2245afa2a1b8a071258082.

Good to know

The provider turns your sentence into filters. Check the filters it used against what you asked before you trust the list.

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