Query 7.8M+ B2B leads from inside Claude or ChatGPT
Add one URL to your AI assistant and it can answer questions about real US business data — how many of a given type exist in a state or city, and how many you could actually reach. Free, no API key.
Server URL
https://leadquasar.com/api/mcpNo authentication. No contact details are ever returned.
How do I connect LeadQuasar to Claude or ChatGPT?
In Claude, open Settings, then Connectors, then Add custom connector, and paste https://leadquasar.com/api/mcp. Leave the OAuth fields empty — the server needs no authentication. Three tools appear once it connects, and you can then ask questions like “how many dentists are in Texas?” in an ordinary chat. The same URL works in ChatGPT connectors, Cursor and any other MCP client that supports remote servers.
Adding it takes about a minute
- 1Open your assistant's connector or integration settings.
- 2Choose to add a custom or remote MCP server.
- 3Paste https://leadquasar.com/api/mcp as the server URL.
- 4Leave any OAuth or API-key fields blank, and save.
Try these once it connects
Click a prompt to copy it, then paste it into a chat with the connector switched on. Each one is answered from live records, not from the model’s memory.
Use LeadQuasar in ChatGPT
LeadQuasar is not listed in ChatGPT’s directory yet, so you add it by URL. ChatGPT supports custom remote MCP servers through Developer mode, which OpenAI makes available on Plus, Pro, Business, Enterprise and Education accounts on the web.
- 1In ChatGPT on the web, open Settings, then Security and login, and turn on Developer mode.
- 2Add a new app for a remote MCP server from the plugins or apps panel.
- 3Enter https://leadquasar.com/api/mcp as the server URL and choose No authentication.
- 4Start a chat with it enabled and ask one of the prompts above.
All three tools declare themselves read-only, so ChatGPT does not treat them as write actions that need approving on every call. Menu names in ChatGPT change from time to time — if a label differs, look for Developer mode under settings.
What it can answer
count_businesses
How many businesses of a given type exist in a state or city, and how many have an email or phone on file.
“How many dentists are in Texas?”
search_businesses
A sample of matching businesses with industry, location, team size and data-quality signals.
“Show me a sample of HVAC contractors in Phoenix.”
list_industries
Every industry covered and how many verified businesses each holds.
“What industries does LeadQuasar cover?”
What it deliberately does not return
No names, companies, email addresses, phone numbers or street addresses — ever. The tools report that a business exists, where it is, roughly how big it is, and whether an email or phone is on file. That is enough to size a market before you commit to anything, and not enough to run outreach.
Contact details live behind a free account, which shows email and phone on screen for 50 leads a day without a card.
Create a free accountQuestions
What is an MCP server?
Model Context Protocol is an open standard that lets an AI assistant call an external tool instead of guessing from memory. Adding this connector means Claude or ChatGPT can query our lead database directly and answer with a real number rather than an estimate.
Does it cost anything?
No. The connector is free and needs no API key or account. It returns counts and firmographics, never contact details. To see the emails and phone numbers themselves, a free account on leadquasar.com unlocks 50 leads a day without a card.
Does it expose contact details?
No. These tools never return a name, company, email address, phone number or street address. They return counts, industry, location, team size, quality scores, and whether an email or phone exists — enough to size a market, not to contact anyone.
Which clients does it work with?
Any MCP client that supports remote servers over streamable HTTP, including Claude, ChatGPT (through Developer mode), Cursor and Windsurf. There is nothing to install locally — it is a URL.
Is LeadQuasar listed in the ChatGPT or Claude app directories?
Not yet. It is published in the official MCP Registry, and you can add it to Claude or ChatGPT today by pasting the server URL as a custom connector — no approval or listing is needed for that. Every tool is marked read-only, so clients that ask before running write actions do not need to.
How accurate are the numbers?
Every figure is counted live against the database at the moment you ask. Where a business type has no industry category of its own, the tool falls back to matching company names and says so in its answer, so you can tell a precise count from a floor.