Email Verification MCP Server
Connect BillionVerify to ChatGPT and other remote MCP clients with one hosted endpoint and OAuth sign-in. No API keys in the URL.
# Claude Code
claude mcp add --transport http billionverify https://mcp.billionverify.com/mcp
# Then inside Claude Code
/mcp
# ChatGPT and other remote MCP clients
https://mcp.billionverify.com/mcpWorks Everywhere
AI clients, coding assistants, and custom integrations
AI Chat Clients
Claude Desktop, ChatGPT Desktop, DeepSeek, Kimi, MiniMax, Doubao
AI Coding Tools
Claude Code, OpenCode, Cursor, Windsurf, Cline, Continue, Zed
CLI Tools
Gemini CLI, Codex CLI, Droid, any MCP-compatible terminal
AI SDKs
Anthropic SDK, OpenAI SDK, Vercel AI SDK, LangChain
Custom Integration
REST API, HTTP Streamable Transport, JSON-RPC 2.0
Enterprise Email Verification Features
Comprehensive validation capabilities for AI agents
Real-time Verification
Verify single emails in under 2 seconds with full SMTP validation
Batch Processing
Validate up to 50 emails at once with concurrent processing
SMTP Verification
True mailbox verification - not just syntax or DNS checks
Disposable Detection
Block temporary and throwaway email addresses
Role-based Detection
Identify support@, info@, noreply@ addresses
Smart Caching
7-day cache for valid/invalid emails, instant repeated lookups
Remote MCP Setup
Use the hosted endpoint and sign in with OAuth
Create Account
Create a BillionVerify account or sign in before connecting your MCP client
Add Remote Endpoint
Use https://mcp.billionverify.com/mcp in your client MCP settings
Authenticate
Complete OAuth in your browser or run /mcp in Claude Code
Why SMTP Verification Matters
Most verification services skip the crucial step that actually works
The Problem with Basic Verification
Syntax and DNS checks only confirm an email looks valid. They cannot tell you if the mailbox actually exists or accepts mail.
SMTP Verification - The Real Solution
Our servers connect directly to mail servers on port 25 to verify mailbox existence. This is the only way to truly confirm email deliverability.
Why Only Specialized Services Can Offer This
Most cloud providers block port 25. AWS, GCP, Azure, and most VPS providers restrict SMTP access. We operate dedicated infrastructure with whitelisted IPs for accurate verification.
Why Choose BillionVerify MCP
The first and only enterprise-grade email verification for AI agents
Frequently Asked Questions
1. Do I need to install anything for Claude Code or OpenCode?
No local package is required for remote MCP clients. Connect the hosted endpoint and sign in with OAuth. If your client only supports local stdio servers, use the BillionVerify CLI or REST API.
2. How do I use this with Claude Code?
Run: claude mcp add --transport http billionverify https://mcp.billionverify.com/mcp. Then run /mcp inside Claude Code and complete OAuth in your browser.
3. Does this work with OpenCode?
If your OpenCode build supports remote MCP over HTTP, add https://mcp.billionverify.com/mcp in MCP settings and complete OAuth. Otherwise use the BillionVerify CLI or REST API.
4. How do I set up in Cursor or Windsurf?
Go to MCP settings in Cursor or Windsurf, add the hosted endpoint https://mcp.billionverify.com/mcp, and complete OAuth if the client supports remote MCP sign-in.
5. Can I use this with ChatGPT, DeepSeek, or Kimi?
Yes. ChatGPT can connect directly to https://mcp.billionverify.com/mcp and complete BillionVerify sign-in and consent in the browser.
6. Can I call this from Anthropic SDK or OpenAI SDK?
Yes. Use our REST API endpoint or integrate MCP tools programmatically. Works with Anthropic SDK, OpenAI SDK, Vercel AI SDK, and LangChain.
7. Why is SMTP verification important?
SMTP verification is the only way to confirm a mailbox exists. Syntax and DNS checks miss 20-40% of invalid emails. We operate dedicated infrastructure with port 25 access that cloud providers block.
8. Does Gemini CLI support this MCP server?
If your Gemini CLI build supports remote MCP over HTTP, add the hosted endpoint and complete OAuth. Otherwise use the BillionVerify CLI or REST API.
Give Your AI Agent Email Verification Powers
Join thousands of developers using BillionVerify MCP with Claude Code, OpenCode, Gemini CLI and more.
99.9% SMTP-level accuracy · Real-time API & bulk verification · Instant setup