Apollo MCP Server

MCP server for Apollo.io contact and company enrichment. Gives Claude direct access to Apollo's people and organization data — find emails, enrich LinkedIn profiles, and discover contacts at target companies.

Tools

People

Tool	Description
find_person	Find a person's email by name and company. Optional job title improves match accuracy.
enrich_by_linkedin	Look up email and contact details from a LinkedIn profile URL. More accurate than name search when you already have the URL.

Companies

Tool	Description
search_company	Find people who work at a given company. Accepts company name or domain. Optional title filter (e.g. "CEO", "Head of Chemistry").
get_company	Get firmographic details about a company: industry, employee count, description. Useful for qualifying leads.

All tools accept a company name or domain — domain matching is more precise when available.

Setup

Prerequisites: Python 3.12+ and uv installed

# 1. Run setup — saves your API key to ~/.apollo-mcp/.env
uvx --from git+https://github.com/pauling-ai/apollo-io-mcp-server apollo-mcp --setup

That's it. The key is stored in ~/.apollo-mcp/.env and loaded automatically every time the server starts — no need to pass it in .mcp.json or set environment variables.

Claude Code / MCP Configuration

After running --setup, add to your .mcp.json:

{
  "mcpServers": {
    "apollo": {
      "type": "stdio",
      "command": "uvx",
      "args": ["--from", "git+https://github.com/pauling-ai/apollo-io-mcp-server", "apollo-mcp"],
      "env": {}
    }
  }
}

No API key in the config — it's read from ~/.apollo-mcp/.env automatically.

CLI Options

• --setup — Save API key to ~/.apollo-mcp/.env and verify it works
• --status — Verify API key is valid and exit
• --log-level {DEBUG,INFO,WARNING,ERROR} — Logging level (default: WARNING)
• --transport {stdio,streamable-http} — Transport mode (default: stdio)
• --version — Print version and exit

Apollo Credits

Apollo charges credits for enrichment calls. Key things to know:

• find_person and enrich_by_linkedin consume enrichment credits per call
• include_phone=True costs additional credits — only use when needed
• search_company uses search credits (cheaper than enrichment)
• get_company uses organization enrichment credits
• Free tier is limited — check your plan at Apollo billing

Troubleshooting

API key not found: Run apollo-mcp --setup to save your key to ~/.apollo-mcp/.env.

API key rejected (401): Re-run apollo-mcp --setup with a fresh key from developer.apollo.io/#/keys.

Quota exhausted (429): You've hit Apollo's rate limit or used all credits on your plan. Check usage at Apollo billing.

Person not found: Apollo returns found: false when no match exists. Try enrich_by_linkedin with the LinkedIn URL instead of find_person — it's more accurate.

Company search returns no results: Try the company domain instead of name (e.g. acmepharma.com instead of Acme Pharma).

Notes

• Responses are filtered to return only fields useful to Claude — not raw Apollo API blobs
• find_person without a title may match the wrong person when names are common — provide title when available
• Phone is excluded by default to avoid unnecessary credit usage — pass include_phone=True when needed

License

MIT — see LICENSE