📊 2026 Email Verification Market Report — 20 providers benchmarked.Read Report
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/mcpAI clients, coding assistants, and custom integrations
Claude Desktop, ChatGPT Desktop, DeepSeek, Kimi, MiniMax, Doubao
Claude Code, OpenCode, Cursor, Windsurf, Cline, Continue, Zed
Gemini CLI, Codex CLI, Droid, any MCP-compatible terminal
Anthropic SDK, OpenAI SDK, Vercel AI SDK, LangChain
REST API, HTTP Streamable Transport, JSON-RPC 2.0
Comprehensive validation capabilities for AI agents
Verify single emails in under 2 seconds with full SMTP validation
Validate up to 50 emails at once with concurrent processing
True mailbox verification - not just syntax or DNS checks
Block temporary and throwaway email addresses
Identify support@, info@, noreply@ addresses
7-day cache for valid/invalid emails, instant repeated lookups
Use the hosted endpoint and sign in with OAuth
Create a BillionVerify account or sign in before connecting your MCP client
Use https://mcp.billionverify.com/mcp in your client MCP settings
Complete OAuth in your browser or run /mcp in Claude Code
Most verification services skip the crucial step that actually works
Syntax and DNS checks only confirm an email looks valid. They cannot tell you if the mailbox actually exists or accepts mail.
Our servers connect directly to mail servers on port 25 to verify mailbox existence. This is the only way to truly confirm email deliverability.
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.
The first and only enterprise-grade email verification for AI agents
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.
Run: claude mcp add --transport http billionverify https://mcp.billionverify.com/mcp. Then run /mcp inside Claude Code and complete OAuth in your browser.
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.
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.
Yes. ChatGPT can connect directly to https://mcp.billionverify.com/mcp and complete BillionVerify sign-in and consent in the browser.
Yes. Use our REST API endpoint or integrate MCP tools programmatically. Works with Anthropic SDK, OpenAI SDK, Vercel AI SDK, and LangChain.
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.
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.
Join thousands of developers using BillionVerify MCP with Claude Code, OpenCode, Gemini CLI and more.