# How to use ChatGPT to build a B2B lead list with looot

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

## Connect looot to ChatGPT

1. Open ChatGPT Plugins at chatgpt.com/plugins.
2. Select the plus button, then "Add custom MCP server".
3. Enter a name (looot) and a short description, for example: live data APIs, paid per call.
4. Under Connection, choose Public endpoint and paste https://api.looot.ai/mcp, including the /mcp path.
5. Configure authentication, read the risk warning and select "I understand and want to continue".
6. Select "Create as a plugin", review the tools ChatGPT found on the server, then install the plugin.
7. 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](https://developers.openai.com/apps-sdk/deploy/connect-chatgpt)

## Ask ChatGPT

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

## Jobs it calls and what they cost

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.

- `company.search`: 1 call, from $0.00038 per result (Icypeas, the cheapest of 19 providers). Compare providers: [company.search benchmark](/benchmarks/company-search). [About the cheapest provider](/providers/icypeas)

## 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.

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

## Good to know

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

## More

- [The same task in Claude](/guides/claude/b2b-lead-generation)
- [The prompt on its own](/prompts/find-companies-by-filters)
- [All ChatGPT guides](/guides/chatgpt)