🤖 First Agent-Native Email Verifier

Verify Emails from Claude, ChatGPT & Cursor

RocketVerifier ships an official MCP (Model Context Protocol) server. Connect any AI assistant to real-time verification, bulk jobs, and domain lookups — one config snippet, no code.

Get Your API Key See Setup
10
MCP Tools
2
Transports (stdio + HTTP)
0
Lines of Code Required
1
Credit per Email Verified

Why It Matters

Your AI Assistant Already Knows How to Verify Emails

Increasingly, "clean this list" or "check if this email is real" is a sentence typed into Claude or Cursor — not a trip to a dashboard or a custom script. MCP lets AI assistants call RocketVerifier's full API directly inside the conversation.

Most verification tools require a dashboard upload or a hand-rolled API integration. RocketVerifier's MCP server lets an assistant call the API from the conversation.

Example prompt, right inside your AI assistant:

"Here's a list of 40 emails from our webinar signup.
Verify each one and give me a clean CSV of just
the valid, deliverable addresses."

The agent calls verify_email or create_bulk_job for you and formats the answer however you asked.

Setup

Two Ways to Connect

Pick whichever fits your client. Both expose the exact same ten tools.

Local, via npm

Best for Claude Desktop, Cursor, and Windsurf. Runs on your machine via stdio, no server to manage. 

npx @rocketverifier/mcp

Add to your client's MCP config:

{
  "mcpServers": {
    "rocketverifier": {
      "command": "npx",
      "args": ["-y", "@rocketverifier/mcp"],
      "env": {
        "ROCKETVERIFIER_API_KEY": "rv_live_your_api_key"
      }
    }
  }
}

Hosted, Zero Install

Best for ChatGPT and any client that supports remote MCP connectors. Just a URL and your API key. 

# No install required

Add as a remote connector:

URL:  https://api.rocketverifier.com/mcp
Auth: Bearer rv_live_your_api_key

No npm, no local process, works from any device — including mobile clients.

Full setup guides for Claude Desktop, Cursor, and ChatGPT are in the MCP documentation, or see per-agent walkthroughs (including n8n, Clay, and Zapier) on the AI Agents page. Prefer a terminal? Try the rocketverifier CLI.

Tool Reference

10 Tools, Every Verification Feature

The MCP server exposes the same functionality as the REST API and dashboard.

Tool Description
verify_email Real-time deliverability check for a single address with a 0-100 confidence score.
create_bulk_job Submit a list of emails for asynchronous bulk verification.
get_job_status Check progress and summary counts for a bulk job.
get_job_results Fetch paginated per-email results, filterable by classification.
list_jobs List recent bulk verification jobs.
cancel_job Cancel a running bulk verification job.
check_credits Check your current credit balance and usage.
check_disposable Disposable-domain lookup (same as the site tools). Not a mailbox check; no verification credits.
mx_lookup MX record lookup for a domain. Not a mailbox check; no verification credits.
check_domain_auth SPF, DKIM, and DMARC lookup and score. Not a mailbox check; no verification credits.

FAQ

MCP server FAQ

What is MCP?

The Model Context Protocol (MCP) is an open standard that lets AI assistants like Claude, ChatGPT, and Cursor call external tools and APIs in a structured, typed way. Instead of building a custom plugin for every assistant, an MCP server exposes a set of tools that any compatible client can call.

Do I need to write any code?

No. For the npm package, you add one JSON snippet to your client's MCP configuration. For the hosted endpoint, you just provide a URL and your API key. No installation or coding required for either.

Which AI assistants and tools support MCP?

Claude Desktop, Claude Code, Cursor, and Windsurf support MCP natively via local (stdio) servers. ChatGPT and other clients that support remote MCP connectors can use our hosted Streamable HTTP endpoint directly with just a URL and API key.

Does using MCP tools cost credits?

verify_email and bulk verification jobs cost 1 credit per email, same as the REST API and dashboard. Results classified as unknown are not charged. check_disposable, mx_lookup, and check_domain_auth are DNS-style lookups (like rocketverifier.com/tools) — they do not use verification credits and are not a live mailbox check.

Can I test it without spending credits?

Yes. Use a sandbox API key (rv_test_...) with addresses at @sandbox.rocketverifier.com to exercise every tool with realistic responses, free of charge.

Is the MCP server open source?

The @rocketverifier/mcp npm package is open source and available on npm and GitHub. The hosted endpoint runs the same tool definitions server-side behind your API key.

Connect Your AI Assistant Today

Get an API key, drop in the config snippet, and start verifying emails from inside Claude, ChatGPT, or Cursor. Eligible work emails can apply for 100 free credits.

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