Bring Email Finder
to LangChain
Create your Vinkius account to connect Hunter to LangChain and start using all 10 AI tools in minutes. Fully managed, enterprise secure, and ready to use without writing a single line of code. No hosting, no server setup — just connect and start using.
GDPR Free for SubscribersCompatible with every major AI agent and IDE
Gemini
What is the Hunter MCP Server?
Connect Hunter.io to your AI agent and power your lead generation with verified email discovery and enrichment.
What you can do
- Domain Search — Find all professional email addresses associated with any company domain.
- Email Finder — Locate a specific person's email using their name and company domain.
- Email Verification — Verify if an email address is valid, deliverable, and safe to send to.
- Lead Lists — Create and manage lead lists with verified contacts for outreach campaigns.
How it works
- Subscribe to the Hunter integration on the marketplace.
- Copy your API key from your Hunter.io dashboard (API section in the left sidebar).
- Ask your AI agent to find emails, verify addresses, or search domains.
Who is this for?
- SDR Teams — Find decision-maker emails instantly and verify them before adding to outreach sequences.
- Growth Marketers — Build targeted prospect lists by domain with verified, deliverable email addresses.
- Recruiters — Locate candidate email addresses by name and company for direct outreach.
Built-in capabilities (10)
Search emails by domain
Count emails for domain
Find specific email
Verify email address
Get account info
Get campaign details
List campaigns
List lead lists
List saved leads
List campaign recipients
Why LangChain?
LangChain's ecosystem of 500+ components combines seamlessly with Hunter through native MCP adapters. Connect 10 tools via Vinkius and use ReAct agents, Plan-and-Execute strategies, or custom agent architectures. with LangSmith tracing giving full visibility into every tool call, latency, and token cost.
- —
The largest ecosystem of integrations, chains, and agents. combine Hunter MCP tools with 500+ LangChain components
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Agent architecture supports ReAct, Plan-and-Execute, and custom strategies with full MCP tool access at every step
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LangSmith tracing gives you complete visibility into tool calls, latencies, and token usage for production debugging
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Memory and conversation persistence let agents maintain context across Hunter queries for multi-turn workflows
Hunter in LangChain
Why run Hunter with Vinkius?
The Hunter connection runs on our fully managed, secure cloud infrastructure. We handle the hosting, maintenance, and security so you don't have to deal with servers or code. All 10 tools are ready to work instantly without any complex setup.
You stay in complete control of your data. Your AI only accesses the information you approve, keeping your sensitive passwords and private details completely safe. Plus, with automatic optimizations, your AI works faster and more efficiently.
* Every connection is hosted and maintained by Vinkius. We handle the security, updates, and infrastructure so you don't have to write code or manage servers. See our infrastructure
Over 4,000 integrations ready for AI agents
Explore a vast library of pre-built integrations, optimized and ready to deploy.
Connect securely in under 30 seconds
Generate tokens to authenticate and link external services in a single step.
Complete visibility into every agent action
Audit live requests, latency, success rates, and active security compliance policies.
Optimize spending and track token ROI
Analyze real-time token consumption and cost metrics detailed by connection.
Explore our live AI Agents Analytics dashboard to see it all working
This dashboard is included when you connect Hunter using Vinkius. You will never be left in the dark about what your AI agents are doing with your tools.
Hunter and 4,000+ other AI tools. No hosting, no code, ready to use.
Professionals who connect Hunter to LangChain through Vinkius don't need to write code, manage servers, or worry about security. Everything is pre-configured, secure, and runs automatically in the background.
Raw MCP | Vinkius | |
|---|---|---|
| Ready-to-use MCPs | Find and configure each manually | 4,000+ MCPs ready to use |
| Connection Setup | Manual coding & server setup | 1-click instant connection |
| Server Hosting | You host it yourself (needs 24/7 uptime) | 100% hosted & managed by Vinkius |
| Security & Privacy | Stored in plaintext config files | Bank-grade encrypted vault |
| Activity Visibility | Blind execution (no logs or tracking) | Live dashboard with real-time logs |
| Cost Control | Runaway AI token spend risk | Automatic budget limits |
| Revoking Access | Must delete files or code to stop | 1-click disconnect button |
How Vinkius secures
Hunter for LangChain
Every request between LangChain and Hunter is protected by our secure gateway. We automatically keep your sensitive data private, prevent unauthorized access, and let you disconnect instantly at any time.
Frequently asked questions
How do I get my Hunter.io API key?
Log in to your Hunter.io account at hunter.io. In the left sidebar, click the API section (or go directly to hunter.io/api-keys). Your API key is displayed on this page. Click the copy button to copy it. Paste it into the configuration field below. Free plans include 25 searches and 50 verifications per month.
Can I find the email of a specific person at a company?
Yes. Give your AI agent a person's first name, last name, and company domain, and it returns their most likely professional email address with a confidence score. Perfect for reaching out to specific decision-makers.
How accurate is the email verification?
Hunter's verification checks MX records, SMTP responses, and catch-all configurations — returning a status of 'valid', 'invalid', 'accept_all', or 'unknown'. Valid emails have over 95% deliverability. Always verify before sending cold outreach to protect your sender reputation.
Does it work with free plans?
Yes. Hunter offers a free plan with 25 email searches and 50 verifications per month. The API key works the same regardless of plan — the only difference is quota limits. Upgrade to a paid plan for higher volumes.
How does LangChain connect to MCP servers?
Use langchain-mcp-adapters to create an MCP client. LangChain discovers all tools and wraps them as native LangChain tools compatible with any agent type.
Which LangChain agent types work with MCP?
All agent types including ReAct, OpenAI Functions, and custom agents work with MCP tools. The tools appear as standard LangChain tools after the adapter wraps them.
Can I trace MCP tool calls in LangSmith?
Yes. All MCP tool invocations appear as traced steps in LangSmith, showing input parameters, response payloads, latency, and token usage.
MultiServerMCPClient not found
Install: pip install langchain-mcp-adapters
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