Email Verifier

Verifox MCP Server

MCP (Model Context Protocol) server that gives Claude and other AI assistants the Verifox API — verify email deliverability and find business emails, both single and in bulk.

Requires Node.js 18 or newer (the client runs it with npx).

Quick start (published package)

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json) or Claude Code MCP config — no install needed, npx fetches it:

{

"mcpServers": { "verifox": { "command": "npx", "args": ["-y", "verifox-mcp"], "env": { "VERIFOX_API_KEY": "foxkey_your_key_here" } } } }

Get a free API key (1,000 credits) at https://verifox.ai/dashboard/api. Restart Claude Desktop and ask it to "verify these emails".

Config paths and add-commands for Claude Code, Claude Desktop, ChatGPT, Cursor, Gemini CLI, Kiro and Codex: https://verifox.ai/email-verification-mcp

Tools

Verify and find are async for large lists: the bulk tools wait ~55s inline, and hand back a jobId to finish via get_job if a job runs longer. Every verification costs 1 credit, including a repeat answered from the 24-hour result cache.

Usage examples

In Claude Desktop (or any MCP client), just ask:

• "Is john@stripe.com deliverable?" → verify_email
• "Verify these emails: admin@stripe.com, test@mailinator.com, john.doe@microsoft.com" → verify_emails
• "Clean this lead list and keep only the safe addresses" → verify_emails
• "Find the email for Patrick Collison at stripe.com" → find_email
• "Find emails for these 20 people and their company domains" → find_emails
• "How many Verifox credits do I have left?" → get_credits
• "Check on that verification job" → get_job

Hosted remote endpoint

No local install: point a remote-capable MCP client at

https://mcp.verifox.ai/mcp

(streamable HTTP) and send your key in the x-api-key header.

Local development

Run straight from source with Bun (no build):

bun install

{

"mcpServers": { "verifox": { "command": "bun", "args": ["run", "/FULL/PATH/TO/verifox-mcp/src/index.ts"], "env": { "VERIFOX_API_URL": "https://api.verifox.ai", "VERIFOX_API_KEY": "foxkey_your_key_here" } } } }

VERIFOX_API_URL defaults to https://api.verifox.ai when unset. For local development against the API on port 8001, set it to http://localhost:8001. Restart your client and the tools appear in its tool list.

Remote (HTTP) mode

The same server also runs as a streamable-HTTP MCP endpoint (for Smithery, claude.ai connectors, and other remote MCP clients). Set MCP_TRANSPORT=http (or a PORT) and it listens on POST /mcp with a GET /health check:

MCP_TRANSPORT=http PORT=8080 node dist/index.js

or: docker build -t verifox-mcp . && docker run -p 8080:8080 verifox-mcp

In HTTP mode the Verifox API key is read per request from the Authorization: Bearer header (also accepts x-api-key or ?api_key=) — so one hosted endpoint serves many users, each on their own credits.

Environment Variables

Generate a foxkey_* key from the Verifox dashboard (API Keys). The key authenticates every tool call and is the account whose Fox Credits are charged (verify costs 1 credit per email, find 10 per contact; get_credits is free).