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.

Hunter MCP Server for OpenAI Agents SDK 10 tools — connect in under 2 minutes

Name: Hunter
Availability: InStock
Author: Vinkius

openai.github.io/openai-agents-python/mcp

Built by Vinkius GDPR 10 Tools SDK

The OpenAI Agents SDK enables production-grade agent workflows in Python. Connect Hunter through Vinkius and your agents gain typed, auto-discovered tools with built-in guardrails. no manual schema definitions required.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

import asyncio
from agents import Agent, Runner
from agents.mcp import MCPServerStreamableHttp

async def main():
    # Your Vinkius token. get it at cloud.vinkius.com
    async with MCPServerStreamableHttp(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    ) as mcp_server:

        agent = Agent(
            name="Hunter Assistant",
            instructions=(
                "You help users interact with Hunter. "
                "You have access to 10 tools."
            ),
            mcp_servers=[mcp_server],
        )

        result = await Runner.run(
            agent, "List all available tools from Hunter"
        )
        print(result.final_output)

asyncio.run(main())

Fully ManagedVinkius Servers

60%Token savings

High SecurityEnterprise-grade

IAMAccess control

EU AI ActCompliant

DLPData protection

V8 IsolateSandboxed

Ed25519Audit chain

<40msKill switch

Stream every event to Splunk, Datadog, or your own webhook in real-time

* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About Hunter MCP Server

Connect Hunter.io to your AI agent and power your lead generation with verified email discovery and enrichment.

The OpenAI Agents SDK auto-discovers all 10 tools from Hunter through native MCP integration. Build agents with built-in guardrails, tracing, and handoff patterns. chain multiple agents where one queries Hunter, another analyzes results, and a third generates reports, all orchestrated through Vinkius.

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.

The Hunter MCP Server exposes 10 tools through the Vinkius. Connect it to OpenAI Agents SDK in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect Hunter to OpenAI Agents SDK via MCP

Follow these steps to integrate the Hunter MCP Server with OpenAI Agents SDK.

Install the SDK

Run pip install openai-agents in your Python environment

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token from cloud.vinkius.com

Run the script

Save the code above and run it: python agent.py

Explore tools

The agent will automatically discover 10 tools from Hunter

Why Use OpenAI Agents SDK with the Hunter MCP Server

OpenAI Agents SDK provides unique advantages when paired with Hunter through the Model Context Protocol.

Native MCP integration via `MCPServerSse`, pass the URL and the SDK auto-discovers all tools with full type safety

Built-in guardrails, tracing, and handoff patterns let you build production-grade agents without reinventing safety infrastructure

Lightweight and composable: chain multiple agents and MCP servers in a single pipeline with minimal boilerplate

First-party OpenAI support ensures optimal compatibility with GPT models for tool calling and structured output

Hunter + OpenAI Agents SDK Use Cases

Practical scenarios where OpenAI Agents SDK combined with the Hunter MCP Server delivers measurable value.

Automated workflows: build agents that query Hunter, process the data, and trigger follow-up actions autonomously

Multi-agent orchestration: create specialist agents. one queries Hunter, another analyzes results, a third generates reports

Data enrichment pipelines: stream data through Hunter tools and transform it with OpenAI models in a single async loop

Customer support bots: agents query Hunter to resolve tickets, look up records, and update statuses without human intervention

Hunter MCP Tools for OpenAI Agents SDK (10)

These 10 tools become available when you connect Hunter to OpenAI Agents SDK via MCP:

domain_search

Search emails by domain

email_count

Count emails for domain

email_finder

Find specific email

email_verifier

Verify email address

get_account

Get account info

get_campaign

Get campaign details

list_campaigns

List campaigns

list_lead_lists

List lead lists

list_leads

List saved leads

list_recipients

List campaign recipients

Example Prompts for Hunter in OpenAI Agents SDK

Ready-to-use prompts you can give your OpenAI Agents SDK agent to start working with Hunter immediately.

"Find all email addresses at stripe.com."

"Find the email for Sarah Johnson at Acme Corp."

"Verify if contact@oldstartup.io is still valid."

Troubleshooting Hunter MCP Server with OpenAI Agents SDK

Common issues when connecting Hunter to OpenAI Agents SDK through the Vinkius, and how to resolve them.

MCPServerStreamableHttp not found

Ensure you have the latest version: pip install --upgrade openai-agents

Agent not calling tools

Make sure your prompt explicitly references the task the tools can help with.

Hunter + OpenAI Agents SDK FAQ

Common questions about integrating Hunter MCP Server with OpenAI Agents SDK.

How does the OpenAI Agents SDK connect to MCP?

Use MCPServerSse(url=...) to create a server connection. The SDK auto-discovers all tools and makes them available to your agent with full type information.