Plug 1.7 billion companies into your AI agent

A free, open-data MCP server for AI-agent builders. Get a key, make 100 calls a month at no cost, no card required. Data comes from public business registries and open datasets — with attribution.

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The endpoint

One JSON-RPC 2.0 endpoint, authenticated with an X-API-Key header:

POST https://clapleads.com/api/mcp/

prospecting.companies.search

Search companies by query + structured filters across the public-registry corpus.

prospecting.people.search

Search stored contacts (safe-mode aware — respects the platform’s people-data policy).

companies.lookup_website

Resolve a website domain to its company record in the local database.

signals.list

List stored company signals (hiring, funding and other events) for a domain.

Connect in one step

Replace YOUR_KEY with the key you create in your dashboard.

Claude Code

claude mcp add --transport http clapleads \
  https://clapleads.com/api/mcp/ \
  --header "X-API-Key: YOUR_KEY"

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "clapleads": {
      "type": "http",
      "url": "https://clapleads.com/api/mcp/",
      "headers": { "X-API-Key": "YOUR_KEY" }
    }
  }
}

Cursor (mcp.json)

{
  "mcpServers": {
    "clapleads": {
      "url": "https://clapleads.com/api/mcp/",
      "headers": { "X-API-Key": "YOUR_KEY" }
    }
  }
}

curl quickstart

curl -sS https://clapleads.com/api/mcp/ \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_KEY" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

ChatGPT: add a custom connector pointing at https://clapleads.com/api/mcp/ with your X-API-Key header once your workspace supports HTTP MCP connectors.

Open data, honestly licensed

Results are drawn from public business registries and open datasets. 17 of those sources carry licences that require attribution, and every one is credited by name — with its licence and terms — on our Data Sources page. Sources whose licence forbids redistribution are never exported and never returned by the API. See the full source registry on Data Sources.

Ready to build?

Create a free account, generate a key in the developers dashboard, and point your agent at the endpoint above.

Create your free key